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SECTION 07325
CERAMIC SLATE ROOFING
NOTE ** Celadon(tm) ceramic slate roofing system.
NOTE **
NOTE ** This section is based on Celadon(tm) Ceramic
Slate(tm), a unique roofing system that simulates
the appearance of heavy, natural slate roofing in
an interlocking ceramic roof tile.
NOTE **
NOTE ** Celadon Ceramic Slate is applied on sloped roofs
where appearance, longevity, and durability are
prime considerations. The ceramic slates are
molded from six compatible slate textures and are
available in five natural slate colors. The
product is virtually impervious to moisture, heat
and fire, and it easily withstands repeated freeze-
thaw cycles.
NOTE ** For additional information and literature, contact
Celadon as follows:
NOTE ** Architectural Support Group
NOTE ** P.O. Box 860
NOTE ** Valley Forge PA 19482
NOTE ** Tel. (800) 699-9988
NOTE ** Fax. (610) 341-7940
NOTE **
NOTE ** SECTION 07325 - CERAMIC SLATE ROOFING, Copyright
1998, The Architect's Catalog, Inc.
NOTE ** Alpine Conditions: Celadon requires specific
measures besides those included in this
specification when ceramic slate is to be used in
alpine conditions. Climatic conditions of frequent
heavy snowfalls alternating with strong solar
radiation, as is common in high altitudes, are
classified as alpine conditions. Snow guards are
recommended to prevent sudden snow movement on the
roof. Before use of ceramic slate in alpine
conditions, plans must be submitted to the Ludowici
Technical Department at (800) 945-8453 for
approval.
PART 1 GENERAL
1.1 SECTION INCLUDES
NOTE ** Delete items below not required for project.
A. Kiln-fired clay roofing slate.
B. Moisture shedding underlayment, eave, valley, and ridge
protection.
C. Metal roof flashing.
D. Roofing cant strips and hip and ridge nailing strips.
E. Fasteners.
1.2 RELATED SECTIONS
NOTE ** Delete any sections below not relevant to this
project; add others as required.
A. Section 06100 - Rough Carpentry: Framing and Sheathing.
B. Section 06114 - Wood Blocking and Curbing.
C. Section 06150 - Wood Decking.
D. Section 07600 - Flashing and Sheet Metal.
E. Section 07710 - Manufactured Roof Specialties: Snow
guards.
F. Section 08620 - Unit Skylights.
1.3 REFERENCES
NOTE ** Delete references from the list below that are not
actually required by the text of the edited
section.
A. ASTM A 167 - Standard Specification for Stainless and
Heat-Resisting Chromium-Nickel Steel Plate, Sheet, and
Strip.
B. ASTM B 370 - Standard Specification for Copper Sheet and
Strip for Building Construction.
C. ASTM B 749 - Standard Specification for Lead and Lead
Alloy Strip, Sheet, and Plate Products.
D. ASTM C 920 - Standard Specification for Elastomeric Joint
Sealants.
E. ASTM C 1167 - Standard Specification for Clay Roof Tiles.
F. ASTM D 226 - Standard Specification for Asphalt-Saturated
Organic Felt Used in Roofing and Waterproofing.
G. ASTM D 1970 - Standard Specification for Self-Adhering
Polymer Modified Bituminous Sheet Materials Used as Steep
Roofing Underlayment for Ice Dam Protection.
H. ASTM D 2626 - Standard Specification for Asphalt-
Saturated and Coated Organic Felt Base Sheet Used in
Roofing.
1.4 SUBMITTALS
A. Submit under provisions of Section 01300.
B. Product Data: Provide manufacturer's printed information
on material characteristics, performance testing, and
application limitations.
C. Installation Instructions: Include manufacturer's
requirements for substrate preparation and installation
of roofing system and related accessories.
D. Shop Drawings: Indicate specially configured metal
flashing, jointing methods and locations for flashing,
and typical roofing system details.
E. Selection Samples: Provide pieces of actual ceramic
slate, illustrating complete range of colors available,
for Architect's selection.
1.5 QUALITY ASSURANCE
A. Manufacturer's Data: Perform work in accordance with
manufacturer's installation instructions. Maintain one
copy of document at project site.
B. Installer Qualifications: Company specializing in
installing roofing of the type specified in this section,
with not fewer than three years of documented experience.
1.6 DELIVERY, STORAGE, AND HANDLING
A. Deliver products to project site in manufacturer's
unopened cartons, labeled with data indicating compliance
with specified requirements.
1.7 WARRANTY
A. See Section 01780 - Closeout Submittals, for additional
warranty requirements.
B. Provide manufacturer's 60-year limited transferable
warranty against defective materials.
1. Supplement: Provide supplemental "FirstFifteen
Protection" warranty to cover labor and materials in
the event of a material defect during the first
fifteen years after completion of ceramic slate
application.
2. Transferability Clause: Include clause in warranty
giving Owner the right to transfer the warranty to a
subsequent owner.
1.8 EXTRA MATERIALS
A. Provide an additional 3 percent of installed roofing
slates, but not less than one full carton, for Owner's
use in roof maintenance.
PART 2 PRODUCTS
2.1 MANUFACTURER
A. Provide Celadon Ceramic Slate, as manufactured by
Celadon; P.O. Box 309; New Lexington, OH 43764. For
additional information, contact Celadon's Architectural
Support Group; P.O. Box 860, Valley Forge PA 19482; ASD.
Tel. (800) 699-9988, Fax. (610) 341-7940.
B. Substitutions will not be acceptable.
2.2 CERAMIC ROOFING SLATES
A. Provide roofing slates with the following properties:
1. Basic Properties: Comply with ASTM C 1167, Grade 1.
2. Weight: 580 pounds per square (28.3 kg/sq m), for
normal 13-1/4 inch (336 mm) exposure.
3. Weight: 589 pounds per square (28.8 kg/sq m), for
low slope 13 inch (330 mm) exposure.
4. Thickness: Nominal 3/4 inch (19 mm), ribbed design.
5. Moisture Absorption: Maximum of 1.0 percent.
6. Minimum Cross Breaking Strength: 300 pounds.
NOTE ** Select one of the color options listed below, or
edit to describe a designed blend of mixed colors.
Delete colors not required for project.
7. Color: Slate Gray.
8. Color: Montpelier Green.
9. Color: Brunswick Black.
10. Color: Slate Red.
11. Color: Plumstone.
12. Color: As selected by Architect from manufacturer's
standard colors.
13. Color Blend:
a. Slate Gray: ___ percent.
b. Montpelier Green: ___ percent.
c. Brunswick Black: ___ percent.
d. Slate Red: ___ percent.
e. Plumstone: ___ percent.
B. Accessory Slate Shapes: Provide the following accessory
shapes, in color matching field slates, for areas shown
on the drawings:
1. Custom ridge cap.
2. Custom hip cap.
3. Rake edge.
4. Detached gable rake.
5. Half slate.
2.3 SHEET MATERIALS
NOTE ** Select one of the following three underlayments if
roof slope is over 4 inches per foot; retain
WinterGuard for use at valleys, hips, and ridges.
NOTE **
NOTE ** For low slope roofs between 3 inches per foot and 4
inches per foot, WinterGuard or its equivalent must
be used as an underlayment.
NOTE **
NOTE ** Celadon Ceramic Slate should not be installed on
roofs sloped less than 3 inches per foot.
A. Underlayment: ASTM D 1970, self-adhering rubberized
asphalt membrane with high traction surface, internal
reinforcement, and "split" back plastic release film.
1. Provide CertainTeed "WinterGuard" sheet barrier
waterproofing shingle underlayment.
B. Underlayment: ASTM D 2626; one layer of No. 40 coated
base sheet.
C. Underlayment: ASTM D 226; two layers of No. 30 asphalt
impregnated roofing felt.
NOTE ** Select one of the following flashing materials and
delete the others, unless you intend to leave all
types for Contractor's selection.
D. Flashing: Terne coated stainless steel; 0.015 inch (0.38
mm) thick stainless steel core material complying with
ASTM A 167, Type 304; coated with 0.092 lb/sq ft (450
g/sq m) terne alloy on both sides of core metal.
E. Flashing: ASTM B 370 copper, cold rolled, 16 oz/sq ft
(0.56 mm thick), natural finish.
F. Flashing: Lead sheet, 2.5 lb/sq ft (1 mm thick);
complying with ASTM B 749.
2.4 ACCESSORIES
A. Screws: No. 8 or No. 9 brass or stainless steel,
flathead Phillips or square drive, not less than 1-3/4
inches (45 mm) long.
B. Nails for Solid Wood Deck: Corrosion resistant copper,
brass, or stainless steel; minimum 3/8 inch (9.5 mm)
head diameter; shank of minimum 11 gage (3 mm) diameter
and length sufficient to penetrate 3/4 inch (19 mm) into
deck but not through the underside.
C. Nails for Plywood Sheathing: Slater's copper ring shank
nail, 11 gage (3 mm), not less than 1-3/4 inches (45 mm)
long with 3/8 inch (9.5 mm) head; point must penetrate
through underside of deck.
D. Wood Nailers and Cant Strips: Preservative-treated wood,
as specified in Section 06114.
E. Adhesive: OSI Pro-Series RT-600 Roof Tile Adhesive.
1. Do not expose to ultraviolet rays.
2. Do not allow direct contact with waterproofing
shingle underlayment.
F. Sealant: ASTM C 920 silicone, low modulus. Provide one
of the following:
1. Dow Corning 790 Silicone Building Sealant.
2. GE SilProof.
NOTE ** Delete the following paragraph if not required.
Copper wire is used to fasten ceramic slates at
valleys.
G. Copper Wire: 18 gage (1.2 mm) minimum.
NOTE ** Snow guards in the following paragraph are
recommended in alpine conditions to prevent snow
movement. Alpine conditions are defined as
climatic areas that experience frequent heavy
winter snowfall intermittent with strong solar
radiation common to high altitude geography.
H. Snow Guards.
2.5 FLASHING FABRICATION
A. Form flashing to profiles indicated on drawings and as
required to protect roofing materials from physical
damage and shed water.
B. Form sections square and accurate in profile, in maximum
possible lengths, free from distortion or defects
detrimental to appearance or performance.
PART 3 EXECUTION
3.1 EXAMINATION
A. Comply with provisions of Section 01700.
B. Verify that roofing penetrations and plumbing stacks are
in place and properly flashed to deck surface.
C. Verify that roof openings are correctly framed.
D. Verify that deck surfaces are dry and free of ridges,
warps, and voids.
3.2 PREPARATION
NOTE ** Celadon requires a minimum deck of 15/32 inch (13
mm) APA approved plywood roof decking or 1-inch (25
mm) nominal thickness, well seasoned tongue-and
groove wood sheathing boards. A 3/4 inch (13 mm)
thick APA approved plywood deck is recommended, but
not required, for superior nail and screw
fastening.
NOTE **
NOTE ** If sheathing boards are used, they must not be over
6 inches (152 mm) in width and must be fastened to
each rafter with not less than two 8d nails.
A. Comply with ceramic slate manufacturer's recommendations
on preparation of acceptable roof deck.
B. Broom clean deck surfaces prior to installation of
underlayment.
3.3 UNDERLAYMENT INSTALLATION
NOTE ** On roofs sloped at least 4 inches per foot (ratio
4:12), install any of the three underlayment types.
On slopes between 3 inches per foot (ratio 3:12)
and 4 inches per foot (ratio 4:12), install
CertainTeed WinterGuard or its equivalent over the
entire deck surface.
NOTE **
NOTE ** Celadon Ceramic Slate may not be applied on roofs
sloped less than 3 inches per foot (ratio 3:12).
A. Install underlayment over entire deck surface, in
accordance with instructions of ceramic slate
manufacturer. At hips, valleys, and ridges, install 36
inch ( 915 mm) width of WinterGuard underlayment or
equivalent, centered on the valley or ridge.
1. Under cold installation conditions, tack WinterGuard
in place if it does not immediately adhere to deck.
B. Ice Dam Protection: Apply WinterGuard underlayment or
equivalent at eaves that are subject to icing and back-up
of water. Apply from roof edge to a line that when
projected to the horizontal is not less than 24 inches
(610 mm) inside of interior wall line.
1. On overhanging eaves that require more than a single
36-inch (915 mm) width of WinterGuard, overlap not
less than 6 inches (152 mm), assuring that overlapped
area is located on overhang, outside wall line.
3.4 FLASHING INSTALLATION
A. Install flashing at all locations where roof intersects
other roofs, sidewall or parapet walls, chimneys,
ventilators, and similar projections, and at gable edges.
NOTE ** Select open or closed valley construction, or
delete both if roof has no valleys. Do not use
open valleys in alpine conditions, because there
are exposed edges for ice to grip -- use closed
valleys instead.
B. Open Valley: Install minimum 20 inch ( 510 mm) wide open
valley metal flashing over 36-inch (915 mm) wide
WinterGuard, with field underlayment lapped over edges of
flashing not less than 4 inches (100 mm) . Fasten metal
with cleats. Overlap metal a minimum of 5 inches (130
mm).
C. Closed Valley: Install closed valley metal flashing over
36-inch (915 mm) wide WinterGuard by interleaving ceramic
slates with minimum 20-inch (510 mm) wide prepared metal
flashing sheets. Attach ceramic slates using copper
wires to copper straps nailed beyond the top edge of the
metal flashing.
3.5 WOOD NAILER AND CANT STRIP INSTALLATION
A. Cant Strip: Install nominal 1 inch by 2 inches by 48
inches (25 mm by 50 mm by 1220 mm) wood cant strips at
eaves. Apply eave flashing and underlayment over cant
strip.
B. Cant Strip: Install nominal 1 inch by 2 inches by 48
inches (25 mm by 50 mm by 1220 mm) pressure-treated wood
cant strips directly over underlayment at eaves, spacing
1 inch (25 mm) apart for drainage.
C. Nailers: Install nominal 1 inch by 2 inches by 48 inches
(25 mm by 50 mm by 1220 mm) pressure-treated wood nailers
as detailed at ridge and hips, directly over
underlayment. Protect with additional layer of
WinterGuard before installing hip and ridge accessory.
3.6 CERAMIC SLATE INSTALLATION
A. Install ceramic slate roofing in strict conformance with
manufacturer's instructions.
NOTE ** Overhang of Celadon Ceramic Slate at eaves should
be not less than 3/4 inch (19 mm) and not more than
2 inches (51 mm). This dimension should be related
to the size of gutters and should either be shown
on the drawings or specified here.
B. Install first course over cant strip, with overhang.
1. Do not drive fasteners tightly against ceramic
slates, to reduce risk of breakage and to allow
natural deck movement.
2. Allow ceramic slate to "hang" on its fasteners.
NOTE ** Delete one of the two subparagraphs below. The
first is for normal conditions, the second for
alpine conditions.
3. Provide 3/4 inch (19 mm) to 2 inches (51 mm)
overhang, permitting proper flow into gutters.
4. Provide not more than 1/2 inch (13 mm) overhang,
unless gutters are in place. If gutters are used,
provide just enough overhang to permit proper flow
into gutters; provide under-eave slate course or
heavy-gage drip edge with extended hemmed lip to
reinforce strength of overhang.
C. Install each subsequent course with joints centered on
ceramic slates below, with maximum exposure in each
course of 13-1/4 inches (336 mm). Wet cut slates at hips
and valleys, using masonry saw with diamond blade.
D. At hip and ridge, and on mansard roofs, install bead of
adhesive at butt end of each slate, located so it is
completely concealed. Install sealant as required at hip
and ridge accessories to achieve watertight installation.
NOTE ** Include the following paragraph for alpine
conditions.
E. Install snow guards where shown and otherwise required by
Code.
3.7 FIELD QUALITY CONTROL
A. Comply with Section 01400 for field inspection.
B. Inspection will involve surveillance of roofing work
during installation to ascertain compliance with
specified requirements.
3.8 PROTECTION
A. Comply with Section 01700.
B. Minimize traffic over finished roof surface. If
necessary, wear soft-soled shoes and walk on the "butt"
of the tile in order to avoid breakage.
END OF SECTION