Bituthene
Description
The original cold applied, non-hazardous self-adhesive sheet membrane invented by W.R. Grace in 1965. Its unique, proven qualities continue to protect major projects in Australia and worldwide.
Uses
Ideally suited to lift pits, basement under slab and wall tanking, cut and cover tunnels, podiums, balconies, roof, car parks, bridge decks, planters and all landscaped areas.
Features
- No toxic or hazardous ingredients
- Immediate access for finishes
- Cold applied and self-adhesive
- Guaranteed uniform thickness
- Laminates to the substrate completely
- Permanently flexible, tough double barrier membrane
- No slip-sheet required for toppings
- Self-sealing to minor punctures
- Fully compatible with Grace Preprufe® and Chemind membrane systems
Typical Properties
Grades
Bituthene® 2000
- Multi purpose, cost-effective membrane for under slab, retaining walls,
lift pits and podium slabs. Also used for heavy duty, double layer applications.
Bituthene® 3000
- Premium quality, heavy-duty tanking membrane for all civil and commercial
applications.
- Used for basements, lift pits, tunnels, podiums, landscaped areas, planters,
balconies, roof
Bituthene® 5000
- Exclusively designed to allow for hot asphalt paving to be placed safely
by hot-mix paving machines. Used for car parks, bridge decks, ramps, helipads
and access driveways.
Bituthene® Grace Ice & Water Shield®
- GIWS prevents condensation damage to plywood under copper, stainless steel
or metal roofing.
- Prevents ingress of wind-driven rain beneath roof coverings such as slate,
shakes or shingles.
Preparation
Surfaces to be waterproofed must be sound, smooth and free
from dust, loose matter, oil, grease or other contaminants.
Concrete must be cured for a minimum of 28 days or contact
Chemind Technical Dept.
All surface defects shall be repaired using Chemind Chembond
modified mortar.
Use Chemind Chemflex PU sealant to fill joints, cracks and
form fillets to internal corners or penetrations.
Application
Detailing
Detail all internal corners, turn-ups, outlets, pile caps and
penetrations with Bituthene® Liquid Mastic Membrane to give a
minimum dry film thickness of 1.0 mm.
Priming
- Apply one coat of Bituthene® Primer at a rate of 5-7 m2/litre and allow to dry.
- Grace Ice & Water Shield® - GIWS does not require priming on clean plywood.
Joints
- Apply 200 mm of Bituthene® membrane strip to all joints and footings.
Application of Continuous Membrane
- Apply Bituthene® membrane cut to length
(max. 2.5 m), by peeling back 300 mm of release paper and pressing onto
the primed surface. Smooth out by hand from centre
to edges (as for wallpaper).
- Pull release paper down progressively while smoothing surface. If end
laps are necessary, lowest sheet is laid first to provide a shingle type
overlap.
- Horizontal
- Lay Bituthene® membranes from the low point to the high
point across the fall line, so that the laps shed water.
- Use 65 mm side and end laps and roll firmly to ensure a watertight seal.
Surfacing
Bituthene® is not UV resistant but can be covered
immediately with the following specific surfacing or protective systems.
- Tanking
- Prior to any backfilling or landscaping, cover with Chemind Protectoboard
or Chemind Rapid Drain.
- Use Chemind Renderflash strip at top edge of to provide neat finish.
- Exposed Surfaces
- Concrete topping or screeds, paving slabs on Chemind Multi Pads or mortar
bed, ceramic tiles on bedding or sand-filled polypropylene synthetic grass.
- Insulated - Thermally
- Chemind Roofmate™ insulation board for guaranteed thermal insulation.
- Use Chemind Sound-Shield sound deadening system under tiles etc. to give
the required acoustic value.
- GIWS – Metal or other suitable roofing.
Coverage
- Bituthene® - Allow 10 -15% wastage
- Primer - 5 m2/litre
- Mastic - 15 litre – Allow 1 pail to 7 rolls of Bituthene®
- Bituthene® Liquid Membrane - 1 litre/m2