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07152lia.txt
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1998-06-10
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SECTION 07152
LEAD MEMBRANE WATERPROOFING
NOTE ** This section is based on products manufactured by
members of the Lead Industries Association, Inc.,
at the following address:
NOTE ** 295 Madison Avenue
NOTE ** New York, NY 10017
NOTE ** Telephone 212-578-4750
NOTE ** Fax 212-684-7714
NOTE **
NOTE ** Lead sheet for plazas, fountains, pools, and other
below-grade applications, as well as for showers,
commercial and institutional kitchen floors, and
computer centers provides waterproofing of the
highest quality. A few outstanding buildings
featuring lead waterproofing are the World Trade
Center, the United Nations Library, and the
American Electric Power System's Computer Center.
NOTE **
NOTE ** SECTION 07152 - LEAD MEMBRANE WATERPROOFING,
Copyright 1996, The Architect's Catalog, Inc.
PART 1 GENERAL
1.1 SECTION INCLUDES
NOTE ** Delete items below not required for project.
A. Fountain and reflecting pool waterproofing.
B. Plaza deck waterproofing.
C. Planter waterproofing.
D. Below-grade waterproofing.
E. Kitchen floor waterproofing.
F. Shower stall waterproofing.
G. __________.
H. Penetration flashings and perimeter flashings for lead
waterproofing.
1.2 RELATED SECTIONS
NOTE ** Delete any sections below not relevant to this
project; add others as required.
A. Section 02740 - Flexible Pavement.
B. Section 02750 - Rigid Pavement.
C. Section 02780 - Unit Pavers.
D. Section 03300 - Cast-In-Place Concrete.
E. Section 07600 - Flashing and Sheet Metal.
F. Section 07615 - Protected Lead Membrane Roofing.
1.3 REFERENCES
NOTE ** Delete references from the list below that are not
actually required by the text of the edited
section.
A. ASTM B 32 - Standard Specification for Solder Metal.
B. ASTM B 749 - Standard Specification for Lead and Lead
Alloy Strip, Sheet, and Plate Products.
C. ASTM D 226 - Standard Specification for Asphalt Saturated
Organic Felt Used in Roofing and Waterproofing.
D. ASTM D 4479 - Standard Specification for Asphalt Roof
Coatings -- Asbestos Free.
E. FS TT-C-494B - Coating Compound, Bituminous, Solvent
Type, Acid Resistant.
F. MIL-C-18480 - Coating Compounds, Bituminous, Solvent,
Coal-Tar Base.
1.4 SUBMITTALS
A. Submit under provisions of Section 01300.
B. Product Data: Provide manufacturer's standard details
and catalog data demonstrating compliance with referenced
standards. Provide installation instructions.
C. Samples: 6 x 6 inch samples of sheet lead.
1.5 QUALITY ASSURANCE
A. Installer Qualifications: Employ only qualified
journeymen lead burners to join sheets of lead.
1.6 DELIVERY, STORAGE, AND HANDLING
A. Handle, store, and protect lead from deformation,
construction traffic, and damage.
PART 2 PRODUCTS
2.1 MATERIALS
A. Sheet Lead:
1. Comply with ASTM B 749.
NOTE ** Delete 1 of the 2 following paragraphs.
2. Weight: 6 psf (3/32-inch thick).
3. Weight: 8 psf (1/8-inch thick).
4. Furnish in 8 x 25 foot rolls, unless otherwise
required or approved.
NOTE ** Delete 1 of the 2 following paragraphs.
NOTE **
NOTE ** Burning (welding) is the preferred method of
joining sheets. Soldering is more rarely used for
smaller installations.
B. Burning Rods: Same composition as sheet lead.
C. Solder: ASTM B 32, 50/50 or 40/60 tin-lead.
D. Underlayment: 30 lb. asphalt-impregnated felt, ASTM D
226, Type II.
E. Slip Sheet: Reinforced plastic or paper such as "Tyvek",
"Visquine" etc.
F. Barrier Coating: Black asphaltum, FS TT-C-494, Type II;
MIL-C-18480; or ASTM D 4479, Type II.
G. Temporary Protection Board: At least one, 1/2-inch thick
layer of suitable protective particle board or plywood.
PART 3 EXECUTION
3.1 EXAMINATION
A. Examine surfaces to receive sheet lead waterproofing.
1. Verify that surfaces are smooth and even, free of
projections, protrusions, or other irregularities.
2. Verify that angles and edges over which lead will be
turned are chamfered or eased.
3. Do not begin waterproofing operations until
surrounding or abutting construction and penetrations
through waterproofing are completed and approved.
4. Verify that concrete is sound, clean, and free of
dirt, dust, debris, or other contaminants.
5. Verify that concrete surfaces have been screeded and
floated to a smooth surface without projecting stones
or other aggregate.
6. Verify that brick or other masonry substrates are
laid true and straight, with joints struck flush or
tooled with half-round tool.
B. Notify the Architect in writing of any defective
conditions encountered.
C. Correct defective conditions before beginning
waterproofing work. Starting of work shall constitute
acceptance of such conditions.
3.2 SURFACE PREPARATION
A. Grind down high spots.
B. Fill low spots with Portland-cement-based patching
compound approved by the Architect.
C. Parge irregular substrates with acrylic-latex modified
Portland-cement-based mortar approved by the Architect.
NOTE ** Delete 1 of the 2 following paragraphs.
NOTE **
NOTE ** Free lime, which occurs in "green" cement, can
corrode lead with disastrous consequences, and
should not be allowed to contact lead sheet.
D. Install 1 layer of underlayment over entire surface to be
waterproofed. Install 1 layer of slip sheet over
underlayment.
E. Coat lower surface of lead to be in contact with new
concrete slabs or other masonry surfaces with a barrier
coating comprised of a continuous, heavy brush coat of
black asphaltum.
3.3 INSTALLATION
A. Lay out sheet to minimize joints.
B. Lap joints between adjoining sheets 1-1/2 inches.
C. Tools, forms, tongs, etc., shall be such as to bend and
work lead to easy curves and to prevent scoring or
damaging the material. Only proper lead working tools
(wooden mallets, dressers, etc.) are acceptable to form
the lead.
D. Allow room for expansion between rigid members.
NOTE ** Delete 1 of the 2 following articles.
NOTE **
NOTE ** Burning (welding) is the preferred method of
joining sheets. Soldering is more rarely used for
smaller installations.
3.4 BURNED JOINTS
A. Clean by shave hook, lead scraper, or wire brush,
sections of lead that are to become a part of the joint.
B. Join adjacent pieces of lead sheet by burning (welding of
lead to lead).
1. Use only the smallest size tip on burning torch.
2. Use only hydrogen and oxygen gases.
3. Take extreme care to avoid burning through or
reducing the thickness of the lead sheet being
joined.
3.5 SOLDERED JOINTS
A. Clean by shave hook, lead scraper, or wire brush,
sections of lead that are to become a part of the joint,
including the underside of the overlapping sheet and the
area of the bottom sheet directly under the lap and at
least 1/4 inch beyond the edge of the lap.
1. Immediately after cleaning, rub a very thin coat of
plumber's candle over shaved or brushed surfaces to
prevent oxidation.
2. Sprinkle powdered rosin over shaved areas.
B. After solder-tacking sheets together at suitable
intervals, feed solder to joints using a clean, well
tinned soldering iron at the proper temperature. Fully
solder the joint surfaces including the underside of the
overlapping sheet and the area of the bottom sheet
directly under the lap.
3.6 PROTECTION
NOTE ** Delete the following paragraph if cementitious
toppings will not be installed in contact with lead
sheet.
A. Cementitious Toppings: Where upper surface of lead sheet
will be exposed to cementitious toppings or setting beds,
apply a continuous, heavy brush coat of black asphaltum
to entire surface of lead sheet.
NOTE ** Depending on project conditions -- whether pool or
planter, whether tile or concrete slabs or earth
fill are to be installed -- the project design may
require a sandwich of various materials between the
lead sheet and the final surfacing exposed to view.
These materials might include permanent insulation,
layers of gravel fill or planting soils, tile
setting beds, concrete slabs, tough protection
boards to guard against specific types of damage,
or any combination of such materials.
NOTE **
NOTE ** Many of these materials would be specified in the
respective finish sections of the specifications;
some could be specified here (and materials added
in Part 2). The following is considered to be a
minimum acceptable level of protection.
B. Protect material and work in place from damage. Repair
any damage that may occur.
C. Provide temporary water cut-offs to prevent penetration
of water underneath the membrane when work is
interrupted, at end of day, or during inclement weather.
Remove and discard temporary cut-offs before proceeding.
D. Temporary Protection: Do not permit construction traffic
directly on top of lead sheet. Install suitable
protection board as installation proceeds to guard
against occasional, essential light traffic and against
excessive temperature changes until permanent covering
has been installed.
END OF SECTION