Install flashing and flashing accessories as the roof membrane is
installed. Apply flashing to cleaned surfaces and as recommended by the
roof membrane manufacturer and as specified. Utilize cured EPDM membrane
flashing and prefabricated accessory flashings to the maximum extent
recommended by the roof membrane manufacturer. Uncured flashing material
shall be limited to reinforcing inside and outside corners and angle
changes in plane of membrane, and to flashing scuppers, pourable sealer
pockets, and other formed penetrations or unusually shaped conditions as
recommended by the roof membrane manufacturer where the use of cured
material is impractical. Extend base flashing not less than 8 inches above
roofing surface and as necessary to provide for seaming overlap on roof
membrane as recommended by the roof membrane manufacturer. Seal flashing
membrane for a minimum of 75 mm (3 inches) on each side of fastening device
used to anchor roof membrane to nailers. Completely adhere flashing sheets
in place. Seam flashing membrane in the same manner as roof membrane,
except as otherwise recommended by the membrane manufacturer's printed
instructions and approved by the Contracting Officer. Reinforce all
corners and angle transitions by applying uncured membrane to the area in
accordance with roof membrane manufacturer recommendations. Mechanically
fasten top edge of base flashing with manufacturer recommended termination
bar fastened at maximum 300 mm (12 inches) on center. Sheet metal flashing
shall be installed over the termination bar in the completed work.
Mechanically fasten top edge of base flashing for all other terminations in
a manner recommended by the roof membrane manufacturer. Apply membrane
liner over top of exposed nailers and blocking and to overlap top edge of
base flashing installation at curbs, parapet walls, expansion joints and as
otherwise indicated to serve as waterproof lining under sheet metal
flashing components. Metal flashing are specified under Section 07600,
"Flashing and Sheet Metal."
[3.2.8.1
Flashing at Roof Drain
**************************************************************************
NOTE: Include this paragraph when roof drains are
indicated.
**************************************************************************
Roof drains are specified in Section 15400 PLUMBING SYSTEMS. Flashing for
roof drains, are specified in Section 07600 FLASHING AND SHEET METAL.
Provide a tapered insulation sump into the drain bowl area. Tapered slope
shall not exceed 18 degrees (4:12) for unreinforced membrane and 5 degrees
(1:12) for reinforced membrane. Tapered insulation shall have surface
suitable for adhering membrane in the drain sump area. Avoid field seams
running through or within 600 mm (24 inches) of roof drain, or as otherwise
recommended by the roof membrane manufacturer. Adhere the membrane to the
tapered in the drain sump area. Apply water block mastic and extend
membrane sheets over edge of drain bowl opening at the roof drain deck
flange in accordance with membrane manufacturer's printed application
instructions. Membrane shall be free of wrinkles and folds in the drain
area. Securely clamp membrane in the flashing clamping ring. Ensure
membrane is cut to within 20 mm (3/4 inch) of inside rim of clamping ring
to maintain drainage capacity. Do not cut back to bolt holes.
][3.2.9
Pre-fabricated Curbs
Prefabricated curbs shall be securely anchored to nailer or other base
substrate and flashed with EPDM membrane flashing materials.
SECTION 07530
Page 26
Previous Page
