Full Product Manual
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Florprufe and Preprufe are registered trademarks of W. R. Grace & Co.–Conn.
We hope the information here will be helpful. It is based on data and knowledge considered to be true and accurate
and is offered for the users’ consideration, investigation and verication, but we do not warrant the results to be
obtained. Please read all statements, recommendations or suggestions in conjunction with our conditions of sale,
which apply to all goods supplied by us. No statement, recommendation or suggestion is intended for any use which
would infringe any patent or copyright. W. R. Grace & Co.–Conn., 62 Whittemore Avenue, Cambridge, MA 02140.
In Canada, Grace Canada, Inc., 294 Clements Road, West, Ajax, Ontario, Canada L1S 3C6.
This product may be covered by patents or patents pending. Copyright 2014. W. R. Grace & Co.–Conn.
PF-001H Printed in U.S.A. 05/14 GCS/PDF
Prepare substrate in accordance with ACI 302.1R Section 4.1.
Install Florprufe 120 over the leveled and compacted base.
Place the membrane with the smooth side down and the plastic
release liner side up facing towards the concrete slab. Remove
and discard plastic release liner. End laps should be staggered
to avoid a build up of layers. Succeeding sheets should be accu-
rately positioned to overlap the previous sheet 2 in. (50 mm)
along the marked lap line.
Laps
1. Mechanical fastening method—
To prevent the membrane from moving and gaps opening, the
laps should be fastened together at 39 in. (1.0 m) maximum
centers. Fix through the center of the lap area using 0.5 in.
(12 mm) long washer-head, self-tapping, galvanized screws
(or similar) and allowing the head of the screw to bed into the
adhesive compound to self-seal. It is not necessary to x the
membrane to the substrate, only to itself. Ensure the membrane
lays at and no openings occur. (See Figure 1.) Additional
fastening may be required at corners, details, etc. Continuity
is achieved once the slab is poured and the bond to concrete
develops.
OR
2. Taped lap method—
For additional security use Grace Preprufe Tape to secure and
seal the overlaps. Overband the lap with the 4 in. (100 mm)
wide Preprufe Tape, using the lap line for alignment. Remove
plastic release liner to ensure bond to concrete.
Penetrations
Mix and apply Bituthene Liquid Membrane detailing compound
to seal around penetrations such as drainage pipes, etc. (See
Figure 2 and refer to the Bituthene Liquid Membrane data sheet,
BIT-230.)
Concrete Placement
Place concrete within 30 days. Inspect membrane and repair
any damage with patches of Preprufe Tape. Ensure all liner is
removed from membrane and tape before concreting.
Preprufe Tape
Bituthene Liquid
Membrane
Florprufe
Figure 2
Figure 1
Supply
Florprufe 120
Supplied in rolls 4 ft x 115 ft (1.2 m x 35 m)
Roll area 460 ft
2
(42 m
2
)
Roll weight 70 lbs (32 kg) approx.
Ancillary Products
Preprufe Tape is packaged in cartons containing 4 rolls that are 4 in. x 49 ft (100 mm x 15 m).
Bituthene Liquid Membrane is supplied in 1.5 gal (5.7 L) pails.
Physical Properties: Exceeds ASTM E1745 Class A rating
Property Typical Value Test Method
Color White
Thickness (nominal) 0.021 in. (0.5 mm) ASTM D3767—method A
Water vapor permeance 0.03 perms ASTM E96—method B1
Tensile strength 65 lbs/in. ASTM E1541
Elongation 300% ASTM D412
Puncture resistance 3300 gms ASTM D17091
Peel adhesion to concrete >4 lbs/in. ASTM D903
1. Test methods that comprise ASTM E1745 standard for vapor retarders
92