NOTE: Snow guards are necessary accessories for
most tile roofs in sections of the country where
masses of snow and ice accumulate on the roof that
can slide from the roof onto lower roof surfaces and
gutters. Snow guards are manufactured in various
forms, and each type requires different methods of
application. Edit to omit this paragraph if not
necessary to meet project requirements.
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Snow guards which are compatible with the roof tile shall be provided as
indicated.
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 tile
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 tiles and shoe soles shall
be made of a material which will aid in preventing falls.
3.2
TILE REMOVAL
Where work involves partial replacement or repair of roof, Contractor shall
verify each tile for tightness and continued use. Tiles which have been
identified for replacement or re-installation shall be marked for approval
within 30 days of Notice to Proceed. Tiles identified for removal shall be
marked with a non-destructive color mark which can be easily removed.
Tiles 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 all interlocking areas to ensure
proper seating and to prevent water damming. Prior to installation of
tile, 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
3.4.1
Standard Application
Felt shall be laid in horizontal layers on deck areas to be covered with
tile. Two layers of No. 30 felt shall be applied. Two layers shall be run
down valley, ridges, and hips. Applications shall be doubled on rough
surfaces and overlapped 300 mm 12 inches on hips, valleys, and ridges.
Membranes lapping valley felts shall be set in mastic. Joints shall be
lapped 63 mm 2-1/2 inches horizontally and 150 mm 6 inches vertically.
Felt shall be carried 150 mm 6 inches up vertical surfaces and 100 mm 4
inches over gutters. Edges shall be fastened with corrosion-resistant, 12
gauge, 9.5 mm 3/8 inch head standard roofing nails on 150 mm 6 inch
centers. Felt shall be preserved unbroken.
SECTION 07320A
Page 9
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