The installation of thermoset single-ply roofing shall comply with the provisions of this section.
Thermoset single-ply membrane
roofs shall have a design slope
of not less than one-fourth unit vertical in 12 units horizontal (2-percent slope
) for drainage.
Thermoset single-ply roof coverings
shall comply with ASTM D4637, ASTM D5019 or CGSB 37-GP-52M.
Ballasted thermoset low-slope
roofs (roof slope
< 2:12) shall be installed in accordance with this section and Section 1504.4
. Stone used as ballast
shall comply with ASTM D448 or ASTM D7655.