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SECTION 04901
MASONRY RESTORATION MORTARS AND GROUTS
NOTE ** Jahn Masonry Restoration Mortars for repair of
concrete, concrete masonry, brick masonry, terra
cotta, and stone.
NOTE **
NOTE ** This section is based on Jahn Masonry Restoration
Mortars manufactured by Cathedral Stone Products,
Inc., located at the following address:
NOTE ** 8332 Bristol Court, #107
NOTE ** Jessup, MD 20794
NOTE ** Tel: (301) 317-4658
NOTE ** Fax: (301) 317-4670
NOTE ** E-Mail address: Info@jahnmortars.com
NOTE ** Home Page: HTTP://WWW.JAHNMORTARS.COM
NOTE **
NOTE ** Jahn Masonry Restoration Mortars are a complete
line of products for repair of concrete, concrete
masonry, brick masonry, terra cotta, and stone
substrates.
NOTE **
NOTE ** SECTION 04901 - MASONRY RESTORATION MORTARS AND
GROUTS, Copyright 1998, The Architect's Catalog,
Inc.
PART 1 GENERAL
1.1 SECTION INCLUDES
NOTE ** Delete items below not required for project.
A. Masonry Injection Adhesive.
B. Masonry Injection Grout.
C. Masonry Void Injection Grout.
D. Limestone, Sandstone Patching Mortar.
E. Anchor Setting Mortar.
F. Horizontal Concrete Patch.
G. Vertical Concrete Patch.
H. Brick/Terra Cotta Patching Mortar.
I. Masonry Pointing Mortar.
J. Marble Patching Mortar.
K. Casting Mortar.
L. Bluestone and Granite Patching Mortar.
M. Accessories.
1.2 RELATED SECTIONS
NOTE ** Delete any sections below not relevant to this
project; add others as required.
A. Section 03930 - Concrete Rehabilitation.
B. Section 04910 - Unit Masonry Restoration.
C. Section 04920 - Stone Restoration.
1.3 SYSTEM DESCRIPTION
A. Performance Requirements: Supply mortar materials which
require the addition of water only at site for correct
performance; mortar materials requiring site-mixing of
additives to achieve correct performance are not
permitted.
1.4 SUBMITTALS
A. Submit under provisions of Section 01300.
B. Product Data: Manufacturer's descriptive literature for
each type mortar specified in this section.
NOTE ** Delete the following paragraph if specifying custom
colors or finishes.
C. Selection Samples: Two sets of color chips representing
manufacturer's full range of available colors.
D. Verification Samples: Two samples, minimum size 3 inches
(76 mm) square, representing actual color and finish of
products to be installed.
E. Quality Assurance Submittals:
1. Manufacturer's certification that installer of
manufacturer's product is approved.
2. Manufacturer's instructions:
a. Printed installation instructions for each
product specified in this section.
b. Manufacturer's Safety Data Sheets (M.S.D.S.)
1.5 QUALITY ASSURANCE
A. Installer Qualifications: Authorized by manufacturer of
products of this section.
NOTE ** Delete the following paragraph if not required.
B. Mock-ups:
1. Construct mock-ups using materials specified in this
section.
NOTE ** Retain one of the following two sub-paragraphs.
2. Construct mock-ups as directed, at location indicated
or directed.
3. Construct mock-ups at location indicated or directed,
and as follows:
a. Size: ___ feet by ___ feet (___ mm by ___ mm).
b. Include ________.
4. Obtain Architect's acceptance of mock-ups before
beginning construction activities of this section;
accepted mock-ups will be standard by which completed
construction activities of this section is judged.
NOTE ** Retain one of the following two sub-paragraphs.
5. Mock-ups may not remain as part of Work.
6. Accepted mock-ups may remain as part of Work.
NOTE ** Delete the following paragraph if not required.
C. Pre-Installation Meetings:
1. Convene at job site seven (7) calendar days prior to
scheduled beginning of construction activities of
this section to review requirements of this section.
2. Require attendance by representatives of the
following:
a. Manufacturers of products of this section.
b. Installer of this section.
c. Other entities directly affecting, or affected
by, construction activities of this section.
3. Notify Architect four (4) calendar days in advance of
scheduled meeting date.
1.6 DELIVERY, STORAGE, AND HANDLING
A. Store products of this section in manufacturer's unopened
packaging until installation.
B. Maintain storage area for products of this section in
accordance with manufacturer's instructions until
installation.
1.7 PROJECT/SITE CONDITIONS
A. Environmental Requirements: Do not apply mortars to
frozen or hot substrates; apply mortars only when ambient
surface temperature is between 40 degrees F (4 degrees C)
and 90 degrees F (32 degrees C), with low to average
humidity.
PART 2 PRODUCTS
2.1 MANUFACTURERS
A. Acceptable Manufacturer: Cathedral Stone Products, Inc.;
8332 Bristol Court, #107, Jessup, MD 20794. ASD. Tel:
(301) 317-4658, Fax: (301) 317-4670; E-Mail address:
Info@jahnmortars.com; Home Page:
HTTP://WWW.JAHNMORTARS.COM
NOTE ** Delete one of the two following paragraphs;
coordinate with Division 01 requirements.
B. Requests for substitution will be considered in
accordance with provisions of Section 01600.
C. Substitutions: Not permitted.
NOTE ** Delete following paragraph if substitutions not
permitted.
D. Unless otherwise specified for an individual product or
material, supply all products specified in this section
from the same manufacturer.
2.2 MATERIALS
A. Masonry Injection Adhesive: JAHN M30 Micro Injection
Adhesive; low-viscosity, single-component injection grout
for stabilization and rehabilitation of masonry cracks
ranging from 1/16 inch (1.5 mm) to 1/4 inch (6 mm) wide,
in both non-structural simple-void applications and
structural load-bearing applications; cementitious, water-
based, with synthetic material to enhance penetration and
bonding.
B. Masonry Injection Grout: JAHN M40 Crack Injection Grout;
low-viscosity, vapor-permeable single-component injection
grout for stabilization and rehabilitation of masonry
cracks ranging from 1/4 inch (6 mm) to 3/8 inch (9 mm)
wide, in non-structural simple-void applications; mineral-
based, containing no synthetic polymer bonding agents or
additives.
C. Masonry Void Injection Grout: JAHN M50 Void Injection
Grout; low-viscosity, vapor-permeable single-component
injection grout for stabilization and rehabilitation of
masonry cracks from 3/8 inch (9 mm) wide, in
non-structural simple-void applications; mineral-based,
containing no synthetic polymer bonding agents or
additives.
NOTE ** If patching mortar for more than one substrate type
or mortar color is required in project, add a type
designation to the following paragraph similar to
"Stone Patching Mortar Type X:...", duplicate
entire paragraph as many times as required for
types in project, assign a type to each substrate
or color, then edit each paragraph for
requirements. Coordinate type designations with
drawings, or in SCHEDULES Article in PART 3 of this
section.
D. Limestone, Sandstone Patching Mortar: JAHN M70 Stone
Patching Mortar; vapor-permeable single-component mortar
for restoration of natural stone surfaces; mineral-based,
containing no synthetic polymer bonding agents or
additives.
NOTE ** Insert existing substrate type in the following sub-
paragraph, or retain second sub-paragraph if
schedule is to be used; laboratory-engineered
formulations are available for limestone,
sandstone, and precast concrete. Consult
manufacturer for available formulations for other
stone types.
1. Laboratory-engineered formulation for compatibility
with existing ___________ substrate.
2. Laboratory-engineered formulation for compatibility
with existing substrate indicated in SCHEDULE Article
of PART 3 of this section.
NOTE ** Determine method of color selection; retain one of
following four sub-paragraphs. Coordinate
selection method with requirements for Samples in
SUBMITTALS Article of Part 1.
3. Color: Selected from full range of manufacturer's
available standard colors.
4. Color: ____________________.
5. Color: Custom color matching Architect-approved
sample.
6. Color: Specified in SCHEDULES Article of PART 3 of
this section.
E. Anchor Setting Mortar: Jahn M80 Anchor Setting Mortar;
single-component, vapor-permeable, non-shrink mortar for
securing anchors and bolts in new or existing masonry
structures; cementitious water-based material with high
pH and freeze-thaw resistance, containing no synthetic
polymer bonding agents or additives.
F. Horizontal Concrete Patch: Jahn M90 Horizontal Concrete
Patch; single-component, vapor-permeable mortar for
restoration of structural concrete; cementitious mineral-
and water-based material with high pH, low carbonation,
and freeze-thaw resistance, containing no synthetic
polymer bonding agents or additives.
G. Vertical Concrete Patch: Jahn M90 Vertical Concrete
Patch; single-component, vapor-permeable mortar for
restoration of structural concrete; cementitious mineral-
and water-based material with high pH, low carbonation,
and freeze-thaw resistance, containing no synthetic
polymer bonding agents or additives.
NOTE ** If patching mortar for more than one substrate type
or mortar color is required in project, add a type
designation to the following paragraph similar to
"Brick Patching Mortar Type X:...", duplicate
entire paragraph as many times as required for
types in project, assign a type to each substrate
or color, then edit each paragraph for
requirements. Coordinate type designations with
drawings, or in SCHEDULES Article in PART 3 of this
section.
H. Brick/Terra Cotta Patching Mortar: JAHN M100 Terra Cotta
Patching Mortar; vapor-permeable single-component mortar
for restoration of brick and terra cotta surfaces;
mineral-based, containing no synthetic polymer bonding
agents or additives.
1. Laboratory-engineered formulation for compatibility
with oven-fired materials.
NOTE ** Determine method of color selection; retain one of
following four sub-paragraphs. Coordinate
selection method with requirements for Samples in
SUBMITTALS Article of Part 1.
2. Color: Selected from full range of manufacturer's
available standard colors.
3. Color: ____________________.
4. Color: Custom color matching Architect-approved
sample.
5. Color: Specified in SCHEDULES Article of PART 3 of
this section.
NOTE ** If pointing mortar for more than one substrate type
or mortar color is required in project, add a type
designation to the following paragraph similar to
"Stone Pointing Mortar Type X:...", duplicate
entire paragraph as many times as required for
types in project, assign a type to each substrate
or color, then edit each paragraph for
requirements. Coordinate type designations with
drawings, or in SCHEDULES Article in PART 3 of this
section.
I. Masonry Pointing Mortar: JAHN M110 Historic Pointing
Mortar; vapor-permeable single-component mortar for
restoration of masonry mortar joints; mineral-based,
containing no synthetic polymer bonding agents or
additives.
1. Laboratory-engineered formulation for compatibility
with existing substrate.
NOTE ** Determine method of color selection; retain one of
following four sub-paragraphs. Coordinate
selection method with requirements for Samples in
SUBMITTALS Article of Part 1.
2. Color: Selected from full range of manufacturer's
available standard colors.
3. Color: ____________________.
4. Color: Custom color matching Architect-approved
sample.
5. Color: Specified in SCHEDULES Article of PART 3 of
this section.
J. Marble Patching Mortar: JAHN M120 Marble Patching
Mortar; vapor-permeable single-component mortar for
restoration of marble surfaces; mineral-based, containing
no synthetic polymer bonding agents or additives.
1. Laboratory-engineered formulation for compatibility
with existing marble substrates.
NOTE ** Determine method of color selection; retain one of
following four sub-paragraphs. Coordinate
selection method with requirements for Samples in
SUBMITTALS Article of Part 1.
2. Color: Selected from full range of manufacturer's
available standard colors.
3. Color: ____________________.
4. Color: Custom color matching Architect-approved
sample.
5. Color: Specified in SCHEDULES Article of PART 3 of
this section.
K. Casting Mortar: JAHN M150 Casting Mortar; vapor-
permeable single-component dry-pack mortar for natural
stone, terra cotta, or architectural concrete ornamental
castings; mineral-based, containing no synthetic polymer
bonding agents or additives.
1. Laboratory-engineered formulation to replicate
appearance and texture of existing substrates.
NOTE ** Determine method of color selection; retain one of
following four sub-paragraphs. Coordinate
selection method with requirements for Samples in
SUBMITTALS Article of Part 1.
2. Color: Selected from full range of manufacturer's
available standard colors.
3. Color: ____________________.
4. Color: Custom color matching Architect-approved
sample.
5. Color: Specified in SCHEDULES Article of PART 3 of
this section.
L. Bluestone, Granite Patching Mortar: JAHN M160 Hardstone
Patching Mortar; vapor-permeable single-component mortar
for restoration of granite, bluestone, and other hard
stone surfaces; mineral-based, containing no synthetic
polymer bonding agents or additives.
1. Laboratory-engineered formulation for compatibility
with existing hard stone substrates.
NOTE ** Determine method of color selection; retain one of
following four sub-paragraphs. Coordinate
selection method with requirements for Samples in
SUBMITTALS Article of Part 1.
2. Color: Light gray granite.
3. Color: Light gray bluestone.
4. Color: Custom color matching Architect-approved
sample.
5. Color: Specified in SCHEDULES Article of PART 3 of
this section.
M. Water: Potable, containing no materials which would
impair performance or appearance of grout materials.
N. Accessories: Supply accessories specified in
manufacturer's instructions for project conditions.
2.3 MIXES
A. Mix mortar materials in accordance with manufacturer's
instructions; use only mixing methods and equipment
specified.
B. Add only the amount of water specified in manufacturer's
instructions to mortar mixes; re-tempering partially-set
mixes by the addition of water is not permitted.
C. Addition of bonding agents, plasticizers, curing
compounds, or other materials not specified in
manufacturer's instructions, is not permitted.
PART 3 EXECUTION
3.1 EXAMINATION
A. Installer's Examination:
1. Have installer of this section examine conditions
under which construction activities of this section
are to be performed, then submit written notification
if such conditions are unacceptable.
2. Transmit two copies of installer's report to
Architect within 24 hours of receipt.
3. Beginning construction activities of this section
before unacceptable conditions have been corrected is
prohibited.
4. Beginning construction activities of this section
indicates installer's acceptance of conditions.
3.2 PREPARATION
A. Clean surfaces to be treated free of any loose or
deleterious material which could prevent adhesion or
otherwise impair performance of cured mortars.
B. Use of bonding agents to prepare existing surfaces is not
permitted.
3.3 INSTALLATION
A. Install products of this section in accordance with
manufacturer's installation instructions.
NOTE ** Retain the following paragraph if specifying JAHN
M30 Micro Injection Adhesive.
B. Masonry Injection Adhesive:
1. Transverse cracks:
a. Drill a series of injection ports in center of
crack; drill ports in downward direction.
b. Moisten interior of crack immediately before
injection by flushing with clean water; if
surface is allowed to dry out before mortar is
injected, repeat moistening.
c. Seal cracks, between ports, with removable,
non-staining clay or masonry masking tape for low-
pressure applications; patch crack, between
ports, with mortar of type recommended by
manufacturer for high pressure applications.
d. Begin injections at lowest port, continuing
injection until grout flows freely from next port
above; seal off initial port and proceed with
injection at ports above until crack is filled.
2. Lateral (delamination) cracks:
a. Drill a series of injection ports in a square-
grid configuration on face of substrate; drill
ports in downward direction.
b. Moisten interior of crack immediately before
injection by flushing with clean water; if
surface is allowed to dry out before mortar is
injected, repeat moistening.
c. Begin injections at lower left port, continuing
injection until grout flows freely from other
ports; seal off initial port and proceed with
injection at lower right port.
d. Seal off ports with removable, non-staining clay
or masonry masking tape for low- pressure
applications; seal off ports with mortar of type
recommended by manufacturer for high pressure
applications.
e. Order of injection is lower left-lower
right-upper left-upper right; continue until
crack is filled.
3. Remove plugs after forty-eight hours; patch ports and
crack surface, if not previously patched, with mortar
of type recommended by manufacturer, matching color
and texture of existing masonry.
NOTE ** Retain the following paragraph if specifying JAHN
M40 Crack Injection Grout.
C. Masonry Injection Grout:
1. Transverse cracks:
a. Drill a series of injection ports in center of
crack; drill ports in downward direction.
b. Moisten interior of crack immediately before
injection by flushing with clean water; if
surface is allowed to dry out before mortar is
injected, repeat moistening.
c. Seal cracks, between ports, with removable,
non-staining clay or masonry masking tape for low-
pressure applications; patch crack, between
ports, with mortar of type recommended by
manufacturer for high pressure applications.
d. Begin injections at lowest port, continuing
injection until grout flows freely from next port
above; seal off initial port and proceed with
injection at ports above until crack is filled.
2. Lateral (delamination) cracks:
a. Drill a series of injection ports in a square-
grid configuration on face of substrate; drill
ports in downward direction.
b. Moisten interior of crack immediately before
injection by flushing with clean water; if
surface is allowed to dry out before mortar is
injected, repeat moistening.
c. Begin injections at lower left port, continuing
injection until grout flows freely from other
ports; seal off initial port and proceed with
injection at lower right port.
d. Seal off ports with removable, non-staining clay
or masonry masking tape for low- pressure
applications; seal off ports with mortar of type
recommended by manufacturer for high pressure
applications.
e. Order of injection is lower left-lower
right-upper left-upper right; continue until
crack is filled.
3. Remove plugs after forty-eight hours; patch ports and
crack surface, if not previously patched, with mortar
of type recommended by manufacturer, matching color
and texture of existing masonry.
NOTE ** Retain the following paragraph if specifying JAHN
M50 Void Injection Grout.
D. Masonry Void Injection Grout:
1. Transverse cracks:
a. Drill a series of injection ports 1/4 inch (6 mm)
to 3/8 inch (9 mm) diameter at center of void;
drill ports in downward direction.
b. Moisten interior of void immediately before
injection by flushing with clean water; if
surface is allowed to dry out before mortar is
injected, repeat moistening.
c. Seal void, between ports, with removable,
non-staining clay or masonry masking tape for low-
pressure applications; patch crack, between
ports, with mortar of type recommended by
manufacturer for high pressure applications.
d. Begin injections at lowest port, continuing
injection until grout flows freely from next port
above; seal off initial port and proceed with
injection at ports above until void is filled.
2. Lateral (delamination) cracks:
a. Drill a series of injection ports in a square-
grid configuration on face of substrate; drill
ports in downward direction.
b. Moisten interior of void immediately before
injection by flushing with clean water; if
surface is allowed to dry out before mortar is
injected, repeat moistening.
c. Begin injections at lower left port, continuing
injection until grout flows freely from other
ports; seal off initial port and proceed with
injection at lower right port.
d. Seal off ports with removable, non-staining clay
or masonry masking tape for low- pressure
applications; seal off ports with mortar of type
recommended by manufacturer for high pressure
applications.
e. Order of injection is lower left-lower
right-upper left-upper right; continue until
crack is filled.
3. Remove plugs after forty-eight hours; patch ports and
void surface, if not previously patched, with mortar
of type recommended by manufacturer, matching color
and texture of existing masonry.
NOTE ** Retain the following paragraph if specifying JAHN
M70 Stone Patching Mortar.
E. Stone Patching Mortar:
1. Remove dust, dirt, grease, laitance, and other
coatings or foreign substance which might prevent
proper adhesion of mortar.
2. Remove loose or deteriorated masonry from the patch
area, plus an additional 1/4 inch (6 mm) of what
appears to be sound material, to a minimum depth of
1/2 inch (13 mm) using manual or pneumatic cutting
techniques; square-cut edges of void created,
maintaining 90-degree angles.
3. Where indicated, use threaded stainless steel dowels,
or other acceptable anchors, to anchor patches.
4. Complete surface preparation by washing surface with
clean water, using natural-bristle brush.
5. Completely wet substrate immediately before applying
mortar by flushing with clean water.
6. Apply mortar to glistening wet surface, with no
pooling water; if surface is allowed to dry out
before mortar is applied, repeat flushing.
7. Build out mortar material out further than surface of
original substrate; after mortar achieves initial
set, scrape away excess mortar until desired profile
is attained.
8. To ensure color uniformity, wait until material being
removed is consistency of dry sand; for rougher
masonry texture, wait longer before finishing.
9. Do not trowel or float surface excessively to achieve
finish; this can alter texture, porosity, or color of
mortar material.
10. Keep patches moist by water-misting several times a
day for seventy-two hour period, or less in cool
weather.
11. Where access to patches is not possible, cover
patches temporarily with plastic sheeting;
application of plastic sheeting does not alter
requirements for normal curing techniques.
NOTE ** Retain the following paragraph if specifying Jahn
M80 Anchor Setting Mortar.
F. Anchor Setting Mortar:
1. Drill holes horizontal or angled in downward
direction on vertical surfaces; leave walls in
abraded, open-pore condition.
2. Clean holes free of dust, dirt, grease, oil,
laitance, and loose material which would impair
performance of mortar using compressed, oil-free,
air.
3. Clean anchors free of rust, then treat with coating
recommended by manufacturer to prevent rusting; do
not apply mortar until protective coating for anchors
is completely dry.
4. Completely wet holes immediately before applying
mortar by flushing with clean water.
5. Apply mortar to wet surface, with no pooling water;
if surface is allowed to dry out before mortar is
applied, repeat wetting.
6. Pour or place mortar into drill hole approximately
one-half full; insert anchor, twisting, turning, and
tapping anchor to remove voids or air pockets.
7. Fill remainder of cavity with mortar; allow minimum
two days before applying load to anchor.
8. Keep mortar moist by water-misting several times a
day for seventy-two hour period.
NOTE ** Retain the following paragraph if specifying Jahn
M90 Horizontal Concrete Patch.
G. Horizontal Concrete Patch:
1. Remove dust, dirt, grease, laitance and other
coatings or foreign substance which might prevent
proper adhesion of mortar.
2. Remove loose or deteriorated concrete from the patch
area, plus an additional 1/4 inch (6 mm) of what
appears to be sound material, to a minimum depth of
1/2 inch (13 mm) using manual or pneumatic cutting
techniques, or mechanical abrasion techniques; square-
cut edges of void created, maintaining 90-degree
angles.
3. As directed by Architect, cut out reinforcing steel
which is consumed beyond structural use, and install
replacement reinforcing.
4. Mechanically abrade structurally sound corroded
reinforcing steel to white metal finish, then treat
with coating recommended by manufacturer to prevent
rusting; do not apply mortar until protective coating
for reinforcing steel is completely dry.
5. Complete surface preparation by washing surface with
clean water, using natural-bristle brush.
6. Completely wet substrate immediately before applying
mortar by flushing with clean water.
7. Apply mortar to wet surface, with no pooling water;
if surface is allowed to dry out before mortar is
applied, repeat wetting.
8. Apply mortar material flush to surface, then finish
with steel trowel, broom, or float finish, as
directed by Architect.
9. Keep patches moist by water-misting several times a
day for seventy-two hour period.
10. Where access to patches is not possible, cover
patches temporarily with plastic sheeting;
application of plastic sheeting does not alter
requirements for normal curing techniques.
NOTE ** Retain the following paragraph if specifying Jahn
M90 Vertical Concrete Patch.
H. Vertical Concrete Patch:
1. Remove dust, dirt, grease, laitance and other
coatings or foreign substance which might prevent
proper adhesion of mortar.
2. Remove loose or deteriorated concrete from the patch
area, plus an additional 1/4 inch (6 mm) of what
appears to be sound material, to a minimum depth of
1/2 inch (13 mm) using manual or pneumatic cutting
techniques, or mechanical abrasion techniques; square-
cut edges of void created, maintaining 90-degree
angles.
3. As directed by Architect, cut out reinforcing steel
which is consumed beyond structural use, and install
replacement reinforcing.
4. Mechanically abrade structurally sound corroded
reinforcing steel to white metal finish, then treat
with coating recommended by manufacturer to prevent
rusting; do not apply mortar until protective coating
for reinforcing steel is completely dry.
5. Complete surface preparation by washing surface with
clean water, using natural-bristle brush.
6. Completely wet substrate immediately before applying
mortar by flushing with clean water.
7. Apply mortar to wet surface, with no pooling water;
if surface is allowed to dry out before mortar is
applied, repeat wetting.
8. Build out mortar material out further than surface of
original substrate; after mortar achieves initial
set, scrape away excess mortar until desired profile
is attained.
9. Keep patches moist by water-misting several times a
day for seventy-two hour period.
10. Where access to patches is not possible, cover
patches temporarily with plastic sheeting;
application of plastic sheeting does not alter
requirements for normal curing techniques.
NOTE ** Retain the following paragraph if specifying JAHN
M100 Terra Cotta Patching Mortar.
I. Brick/Terra Cotta Patching Mortar:
1. Remove dust, dirt, grease, laitance and other
coatings or foreign substance which might prevent
proper adhesion of mortar.
2. Remove loose or deteriorated masonry from the patch
area, plus an additional 1/4 inch (6 mm) of what
appears to be sound material, to a minimum depth of
1/2 inch (13 mm) using manual or pneumatic cutting
techniques; square-cut edges of void created,
maintaining 90-degree angles.
3. Where indicated, use threaded stainless steel dowels,
or other acceptable anchors, to anchor patches.
4. Complete surface preparation by washing surface with
clean water, using natural-bristle brush.
5. Completely wet substrate immediately before applying
mortar by flushing with clean water.
6. Apply mortar to wet surface, with no pooling water;
if surface is allowed to dry out before mortar is
applied, repeat wetting.
7. Build out mortar material out further than surface of
original substrate; after mortar achieves initial
set, scrape away excess mortar until desired profile
is attained.
8. Do not trowel or float surface excessively to achieve
finish; this can alter texture, porosity, or color of
mortar material.
9. Keep patches moist by water-misting several times a
day for seventy-two hour period.
10. Where access to patches is not possible, cover
patches temporarily with plastic sheeting;
application of plastic sheeting does not alter
requirements for normal curing techniques.
NOTE ** Retain the following paragraph if specifying JAHN
M110 Historic Pointing Mortar.
J. Masonry Pointing Mortar:
1. Remove dust, dirt, grease, laitance and other
coatings or foreign substance which might prevent
proper adhesion of mortar.
2. Rake out deteriorated mortar to depth required for
minimum 1/2 inch (13 mm) depth mortar joint, allowing
for concave joints if project conditions indicate;
remove loose mortar particles.
3. Complete surface preparation by washing surface with
clean water, using natural-bristle brush.
4. Completely wet substrate immediately before applying
mortar by flushing with clean water.
5. Apply mortar to wet surface, with no pooling water;
if surface is allowed to dry out before mortar is
applied, repeat wetting.
6. Tool mortar joints, using pointing tools and
techniques required to match adjacent existing mortar
joints.
7. Keep joints moist by water-misting several times a
day for seventy-two hour period.
8. Where access to joints is not possible, cover joints
temporarily with plastic sheeting; application of
plastic sheeting does not alter requirements for
normal curing techniques.
NOTE ** Retain the following paragraph if specifying JAHN
M120 Marble Patching Mortar.
K. Marble Patching Mortar:
1. Remove dust, dirt, grease, laitance and other
coatings or foreign substance which might prevent
proper adhesion of mortar.
2. Remove loose or deteriorated masonry from the patch
area, plus an additional 1/4 inch (6 mm) of what
appears to be sound material, to a minimum depth of
1/2 inch (13 mm) using manual or pneumatic cutting
techniques; square-cut edges of void created,
maintaining 90-degree angles.
3. Where recommended by manufacturer's instructions, use
threaded stainless steel dowels, or other acceptable
anchors, to anchor patches.
4. Complete surface preparation by washing surface with
clean water, using natural-bristle brush.
5. Completely wet substrate immediately before applying
mortar by flushing with clean water.
6. Apply mortar to wet surface, with no pooling water;
if surface is allowed to dry out before mortar is
applied, repeat wetting.
7. Build out mortar material out further than surface of
original substrate; after mortar achieves initial
set, scrape away excess mortar until desired profile
is attained.
8. Do not trowel or float surface excessively to achieve
finish; this can alter texture, porosity, or color of
mortar material.
9. Keep patches moist by water-misting several times a
day for seventy-two hour period.
10. Where access to patches is not possible, cover
patches temporarily with plastic sheeting;
application of plastic sheeting does not alter
requirements for normal curing techniques.
NOTE ** Retain the following paragraph if specifying JAHN
M150 Casting Mortar.
L. Casting Mortar:
1. Clean and prepare surface of original piece to cast
mold; perform mold-making should be performed in
accordance with mold manufacturer's instructions.
2. Immediately prior to packing mold, apply non-staining
mold release agent recommended by mold manufacturer
to surfaces; include undercut areas.
3. Clean mold of foreign materials which could cause
imperfections; coat mold with non-staining release
agent recommended by mold manufacturer.
4. Scoop 1 to 2 inches (25 to 50 mm) of mixed mortar
into mold, tamping it into place by hand, ensuring
that intricate detailings are completely filled,
particularly in undercut areas; compact mortar by
tamping with wood rams and rubber mallets as build-up
of material proceeds, repeating process until mold is
slightly overfilled.
5. Once filled and compacted, screed off excess mortar
flush with top of mold; cover casting with plastic
sheeting for approximately twenty-four hours.
6. After initial twenty-four hour cure, uncover mold and
pour clean potable water into casting until point of
rejection, then recover with plastic; remove casting
from mold after an additional twenty-four hours,
keeping casting damp for several additional days to
further increase final strength of casting.
NOTE ** Retain the following paragraph if specifying JAHN
M160 Hardstone Patching Mortar.
M. Bluestone and Granite Patching Mortar:
1. Remove dust, dirt, grease, laitance and other
coatings or foreign substance which might prevent
proper adhesion of mortar.
2. Remove loose or deteriorated masonry from the patch
area, plus an additional 1/4 inch (6 mm) of what
appears to be sound material, to a minimum depth of
1/2 inch (13 mm) using manual or pneumatic cutting
techniques; square-cut edges of void created,
maintaining 90-degree angles.
3. Where indicated, use threaded stainless steel dowels,
or other acceptable anchors, to anchor patches.
4. Complete surface preparation by washing surface with
clean water, using natural-bristle brush.
5. Wet substrate immediately before applying mortar by
flushing with clean water.
6. Apply mortar to wet surface, with no pooling water;
if surface is allowed to dry out before mortar is
applied, repeat wetting.
7. Build out mortar material out further than surface of
original substrate; after mortar achieves initial
set, scrape away excess mortar until desired profile
is attained.
8. Do not trowel or float surface excessively to achieve
finish; this can alter texture, porosity, or color of
mortar material.
9. Keep patches moist by water-misting several times a
day for seventy-two hour period.
10. Where access to patches is not possible, cover
patches temporarily with plastic sheeting;
application of plastic sheeting does not alter
requirements for normal curing techniques.
3.4 CLEANING
A. Clean up overflow and excess mortar as construction
activities progress; do not allow mortars to accumulate
and dry on substrates.
3.5 PROTECTION OF INSTALLED PRODUCTS
A. Protect installed products of this section from extreme
heat, freezing, high winds, direct sunlight, or rain
until materials are completely cured in accordance with
manufacturer's instructions.
B. Protect installed products of this section from damage by
subsequent construction activities until Substantial
Completion.
C. Repair damage in accordance with manufacturer's
recommendations; replace units which cannot be repaired
to Architect's acceptance.
NOTE ** The following sample schedule may be used as a
guide to locate types of restoration required on
projects where more than one type of restoration
material is required, where more than one color is
required, or where restoration to more than one
substrate type is required. Delete Article if not
required.
3.6 SCHEDULES
A. Stone Patching Mortars:
1. Type 1: Patch existing precast concrete retaining
wall.
2. Type 2: Patch existing limestone surfaces at Coach
House; match color of Architect-approved samples.
END OF SECTION
