3.5.1
Surface Preparation
Dust, dirt, loose nails or other protrusions shall be removed. Priming is
not required for wood or metal surfaces but is necessary on concrete or
masonry surfaces.
3.5.2
Primer
Primer shall be applied at a coverage rate of 6-9 sq. meters/L 250-350 sq.
ft./gal. Primer shall be applied by spray or paint roller. Pine wood
decks shall be covered with minimum 6 mm 1/4 inch plywood prior to
receiving membrane coverage.
3.5.3
Temperature
Membrane shall be applied only in fair weather when air and surface
temperatures are above 5 degrees C 40 degrees F.
3.5.4
Membrane Application
Membrane shall be applied according to manufacturer's instructions.
Membrane shall be adhered directly to roof deck. The membrane shall be cut
into 3 to 4.5 meter 10 to 15 foot lengths and shall be re-rolled. The
release paper shall be peeled back 300 to 600 mm; 1 to 2 feet;the membrane
shall be aligned on the lower edge of the roof and the first 300 to 600 mm
1 to 2 feet shall be placed. The release paper under the membrane shall be
peeled from the membrane. The membrane shall be pressed in place. Lower
edges shall be rolled firmly with a wallpaper or hand roller. For ice dam
protection, membrane shall be applied to reach a point above the highest
expected level of ice dams; refer to drawings for extent. Ends and edges
shall be overlapped a minimum of 150 mm 6 inches. Membrane shall not be
folded onto an exposed face of the roof edge.
3.5.5
Valley and Ridge Application
The membrane shall be cut into 1.2 to 1.8 meter 4 to 6 foot lengths. The
release paper sheet shall be peeled and centered over the valley or ridge,
then draped and pressed in place, working from the center of the valley or
ridge outward in each direction. For valleys, membrane shall be applied
starting at the low point and working upwards. All sheets shall be
overlapped a minimum of 150 mm 6 inches.
3.5.6
Vertical Membrane Flashings
Vertical wall installations shall receive primer prior to the application
of membrane. Primer shall be applied at a coverage rate of 6-9 sq.
meters/L 250-350 sq. ft./gal. Membrane shall be turned up walls and
dormers as indicated on the drawings. Vertical membrane terminations shall
be mechanically fastened. Vertical terminations shall receive a troweling
of mastic as approved by the membrane manufacturer. Membrane may be folded
onto the fascia, provided it will be covered by a gutter metal edge or
other material.
3.5.7
Protection
Elastomeric membrane underlayment shall not be left permanently exposed to
sunlight. Membrane shall be covered with exposed roofing materials as soon
as possible. Membrane damaged due to exposure to sunlight shall be patched
prior to the application of final roof covering.
SECTION 07310
Page 10
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