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carpet to allow the membrane to fully contact desired, and where reinforced concrete the primed substrate. Seal all T-joints and slabs are placed over the membrane,the use membrane terminations with Bituthene of in.(6 rum)hardboard or 2 layers of Liquid Membrane at the end of the day. '/8 in. (3 mm)hardboard is recommended. Protrusions and Drains • Cover any exposed Bituthene membranes Apply membrane to within I in. (25 mm)of with weather resistant flashing such as the base of the protrusion.Apply Bituthene copper,aluminum or neoprene. Install Liquid Membrane 0.1 in. (2.5 mm)thick protection the same day the membrane is around protrusion. Bituthene Liquid applied or immediately after 24 hour flood Membrane should extend over the membrane testing. No waiting before backfill or appti- a minimum of 2s1/ in. (65 mm)and up the cation of wearing course is necessary. penetration to just below the finished height Insulation of the wearing course. Flood Testing Always apply Bituthene membrane directly to Flood test all horizontal applications with a primed or conditioned structural substrates. minimum 2 in. (51 mm)head of water for Insulation, if used,must be applied over the 24 hours.Mark any leaks and repair when the membrane. Do not apply Bituthene membranes membrane is dry. Before flood testing,be sure over lightweight insulating concrete. the structure will withstand the dead load of Approvals the water.For well-sloped decks,segment the • City of Los Angeles Research Report flood test to avoid deep water near drains. RR 24386 Conduct the flood test 24 hours after complet- • U.S.Department of housing and Urban ing the application of Bituthene waterproofing Development(HUD)HUD Materials system. Immediately after flood test is Release 628E completed, and all necessary repairs made, • Bituthene System 4000 Membrane carries install Hydroduct'660 Drainage Composite an Underwriters'Laboratory Class A Fire to protect the Bituthene membrane from traffic and other trades. Rating(Building Materials Directory, File 41111W4R7910)when used in either of the follow- Membrane Repairs ing constructions: Patch tears and inadequately lapped seams —Limited to noncombustible decks at with membrane. Clean membrane with a damp cloth and dry. Slit fishmouths and repair inclines not exceeding '/4 in. (6 mm)to with a patch extending 6 in. (150 mm)in all the horizontal 1 ft(0.3 m). One layer of directions from the slit and seal edges of the Bituthene waterproofing membrane, patch with Bituthene Liquid Membrane. followed by one layer of Asia (3 mm) Inspect the membrane thoroughly before protection board,encased in 2 in. (50 mm) covering and make any repairs. minimum concrete monolithic pout —Limited to noncombustible decks at Drainage inclines not exceeding 1/4 in. (6 mm)to Hydroduct drainage composites are recom- the horizontal 1 ft(0.3 m). One layer of mended for both active drainage and Bituthene waterproofing membrane, protection of the membrane. See Hydroduct followed by one layer of DOW Styro- product information sheets. foam PD Insulation Board [2 in. (50 mm) Protection of Membrane thick].This is covered with one layer of 2 ftx 2 ft x 2 in.(0.6 m x 0.6 mx 50 mm) Protect Bituthene membranes to avoid concrete paver topping. damage from other trades,construction mate- rials or finishes. Place protection immediately Warranty in temperatures above 77°F(25°C)to avoid Five year material warranties covering potential for blisters. Bituthene and Hydroduct products are avail- • On horizontal applications,exposed to able upon request. Contact your Grace sales construction traffic, use Hydroduct 660 representative for details. Drainage Composite.Adhere as necessary Technical Services to membrane with Hydroduct Tape.Alter- nate methods of protection are to use s/8 in. Support is provided by full time,technically (3 mm)or '/4 in. (6 mm)asphalt hardboard. trained Grace representatives and technical In mud slab waterproofing,or other appli- research and development staff service personnel,backed by a central cations where positive drainage is not