Architectural and Engineering Design Standards

SECTION 07550

MODIFIED BITUMEN MEMBRANE ROOFING (SBS)

Modified Bitumen Membrane Roofing (SBS)

UIHC #20X-0XX 07550-13

K. All raised flashings shall have a counterflashing.

L. All metal, masonry, and concrete in contact with flashing shall be primed and allowed to dry.
No metal flashing shall be set in hot bitumen.

M. A layer of roof cement shall be used to separate any membrane from contact with sheet metal
flashing elements.

N. Bed set-on accessories in a thick coating of roof cement extending under entire metal flange of
each accessory item.

O. Roof Drains:

These specifications apply for installation of cast iron drains only. For all other drain types

follow membrane manufacturer's recommendations.

1. Roofing contractor shall be responsible for modifying existing drain assemblies for
   new roof installation, including, but not limited to, lowering drain assembly,
   modifying leaders, etc. so that there is positive drainage of water around drain.


2. Remove existing flashings (including lead flashings if applicable), roofing material,
   and cement in preparation for new membrane flashing.


3. Provide a clean even finish on the mating surfaces between the clamping ring and the
   drain bowl.


4. Membrane plies, metal flashings, and flash-in plies shall extend under clamping ring.


5. Install new lead flashing, see Section 07620. Prime lead as required.


6. Install flashing membrane plies as recommended by membrane manufacturer.
   Flashing plies shall extend a minimum of 4" beyond edge of lead flashing, but not
   beyond edge of sump.


7. Install the roof drain clamping ring and clamping bolts. Tighten the clamping bolts to
   achieve constant and uniform compression. Replace any damaged, broken, or missing
   clamping rings or with new to match existing drain design. Replace all claming ring
   bolts with new. New bolts shall be brass or stainless steel. Drill and tap broken drain
   bolts as required for installation or replacement bolts.


8. Replace any damaged, broken, or missing drain grates with new. New grates shall be
   metal.


9. Seal between the membrane and the drain base shall be watertight.


10. Prevent bitumen drippage into drain leader.


11. Roof drain is to be checked and made operational at the conclusion of the roof
    construction activities.

November 1, 2016