3.2.1.2
Bitumen Stops
Provide felt bitumen stops or other means to prevent bitumen drippage at
roof edges, openings, and vertical projections before hot mopped
application of the roofing membrane. Felt bitumen stops shall be formed
with two 300 mm (12 inch) wide strips of organic ply felt. Laminate with
and set strips into a coating of asphalt roof cement with one-half of the
width overhanging the edge of the roof or opening. Where nailers are
provided, nail the strips with roofing nails spaced 300 mm (12 inches) on
center in addition to embedding in asphalt roof cement. The free portion
of each strip shall be protected from damage throughout the roofing period.
After the plies of felt are in place, fold free portion of the strips back
over the roofing membrane and embed in a continuous coating of asphalt roof
cement. Secure with roofing nails spaced 75 mm (3 inches) on center.
3.2.2
Equipment
3.2.2.1
Mechanical Application Devices
Mechanical application devices shall be mounted on pneumatic-tired wheels,
and shall be designed and maintained to operate without damaging the
insulation, roofing membrane, or structural components.
3.2.2.2
Flame-Heated Equipment
Do not place flame-heated equipment on roof. Provide and maintain a fire
extinguisher adjacent to flame-heated equipment and on the roof.
[3.2.2.3
Open Flame Application Equipment
Open flame equipment shall be specifically designated for use in
application of roofing materials and approved by the roofing materials
manufacturer. Open flame equipment shall not be ignited (burning) when
left unattended. Provide and maintain a fire extinguisher adjacent to open
flame equipment on the roof.
]3.2.3
Priming of Surfaces
Prime all surfaces to be in contact with adhered membrane materials. Apply
primer at the rate of 3 liters per 10 sq. meters (0.75 gallon per 100 sq.
ft.) or as recommended by roof membrane manufacturer's printed instructions
to promote adhesion of membrane materials. Allow primer to dry prior to
application of membrane materials to primed surface. Avoid flammable
primer material conditions in torch applied membrane base flashing
applications.
[3.2.3.1
Priming of Concrete and Masonry Surfaces
**************************************************************************
NOTE: Include this paragraph when roofing and base
flashing are applied directly to concrete or masonry
surfaces.
**************************************************************************
After surface dryness requirements have been met, coat concrete and masonry
surfaces which are to receive roofing and base flashing uniformly with
primer. Allow primer to dry before application of roofing and flashing
materials.
SECTION 07511
Page 21
Previous Page
