2.1.8
Sealants
Sealants, where required, shall be in accordance with the slate
manufacturer's recommendations.
PART 3
EXECUTION
3.1
PROTECTION OF ROOF SURFACES
Equipment (such as padded ridge ladders) and techniques shall be used which
prevent damage to roof as a result of foot or material traffic. Contractor
shall be responsible for controlling breakage of new or existing slate
beyond what is indicated. The progression of work shall be laid out and
presented to the Contracting Officer to prevent other trades from working
on or above completed roofing. Personnel who are working on the roof shall
have proper shoes which will not further damage slates, and shoe soles
shall be made of a material which will aid in preventing falls.
3.2
SLATE REMOVAL
Where work involves partial replacement or repair of roof, Contractor shall
verify each slate for tightness and continued use. Testing shall be done
with broad, flat-nosed, slater's pliers. Slates which have been identified
for replacement or re-installation shall be marked for approval within 30
days after Notice to Proceed. Slates identified for removal shall be
marked with a non-destructive color mark removable by solvent, rather than
water. Slates fastened with non-copper fasteners shall be re-fastened with
proper copper fasteners.
3.3
PREPARATION OF SURFACES
Roof deck surfaces shall be smooth, clean, firm, dry, and free from loose
boards, large cracks, and projecting ends that might damage the roofing.
Foreign particles shall be cleaned from interlocking areas to ensure proper
seating and to prevent water damming. Prior to installation of slate,
vents and other projections through roofs shall be properly flashed and
secured in position, and projecting nails shall be driven firmly home.
3.4
ROOFING FELT
Felt shall be laid in horizontal layers with joints lapped toward eaves and
at ends at least 50 mm 2 inches, and secured along laps and at ends as
necessary to hold the felt in place and protect the structure until covered
with the slate. Felt shall be preserved unbroken, tight and whole. Felt
shall lap hips and ridges at least 300 mm 12 inches to form a double
thickness and shall be lapped 50 mm 2 inches over the metal of valleys or
built-in gutters.
3.5
ELASTOMERIC MEMBRANE UNDERLAYMENT
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NOTE: A composite self-adhering membrane will be
used in areas where ice build-up (ice dams) and wind
driven rains are potential problems. In such areas,
underlayment installation will be detailed on the
drawings. Edit these paragraphs to meet project
requirements.
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SECTION 07310
Page 9
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