TL-0016 — PREPRUFE® Waterproofing Membranes: Cold Weather Installation Technical Letter

This bulletin is intended to provide additional guidance on the use of PREPRUFE® membranes in cold weather.

PREPRUFE® 300R LT, PREPRUFE® 300R Plus LT and PREPRUFE® 160R Plus LT systems were designed for application temperatures between 25°F (-4°C) and 60°F (+16°C). The specially formulated low temperature adhesive provides for easy formation of side laps at temperatures down to 25°F (-4°C).

As an alternative to PREPRUFE® 300R LT and PREPRUFE® 160R LT, PREPRUFE® 300R or PREPRUFE® 160R can be used down to 25°F (-4°C), but the use of PREPRUFE® Tape LT is required at all laps and detailing below 55°F (13°C).

As an alternative to PREPRUFE® 300R Plus LT and PREPRUFE® 160R Plus LT, PREPRUFE® 300R Plus and PREPRUFE® 160R Plus can be used down to 25F (-4C), but the use of PREPRUFE® Tape LT is required at all laps and detailing below 40F (4C).

Steel reinforcement should be placed using approved rebar chairs as explained in Technical Letter #15, Rebar Chairs on PREPRUFE® Membranes. Follow American Concrete Institute’s Cold Weather Concreting – ACI 306R88 to ensure concrete properly cures allowing the PREPRUFE® to form an intimate bond to the concrete.