3.4.2
Special Applications
Low pitch roofs shall have two layers of felt installed and shall be
solidly mopped between felt layers and on top of felt layers with 11.3 kg
per 9.3 sq. meter 25 pounds per square of hot asphalt.
3.5
ELASTOMERIC MEMBRANE UNDERLAYMENT
**************************************************************************
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.
**************************************************************************
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.
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. Pine wood decks shall be
covered with minimum 6 mm 1/4 inch plywood prior to receiving membrane
coverage. 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 and 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 pulled and 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.
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 footlengths. The
release paper shall be peeled and the sheet centered over the valley or
ridge, 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. Sheets shall overlap a
minimum of 150 mm. 6 inches.
SECTION 07320A
Page 10
Previous Page
