BiLar™ is a multi component Class A vapor
barrier composed of a highly puncture resistant
tightly woven fabric coated with a strong, low perm,
and long lasting polyolefin resin.
BiLar™ is designed for use as a high performance
vapor barrier under slabs, permanent liner in sealed
crawl spaces, in vertical waterproofing, and flashing
BiLar™ provides more abrasion and puncture
resistance than standard 15 mil poly sheeting.
BiLar™ is a composite product consisting
of a tightly woven, puncture resistant polypropylene
fabric laminated on both sides with a 4 mil polypropylene
BiLar™ is available in 2’ and 10’
widths in lengths of 150’. BiLar™
weighs approximately 32lbs/Msf.
BiLar™ exceeds standards set forth in ASTM
E-1745-97 for plastic water vapor retarders used
in contact with a soil or granular fill under
- Under Slab Vapor
Base aggregate or soil should be tamped and level
according to local building code. Install BiLar™
white side up, parallel to direction of pour.
Overlap seams a minimum of 6” stapling the
underlying portion with blind clinch staples (sod
staples) inserted 45° and 3” from edge
every 5’. Clean seams then install DryDog™
Barriers white 9 mil seam tape the entire length
of the seam.
Foundation or wall should first be prepped, coated
with waterproofing membrane, and allowed to cure
per manufacturers instructions. BiLar™ should
then be unrolled and cut to fit desired location.
Clean and tape the length of any seams with DryDog™
Barriers white 9 mil seam tape. Fasten using mechanical
fasteners with washers above the grade line at least
1” from edge every 3’.
BiLar™ should be stored out of direct sunlight.
Additional technical services are available from
DryDog™ Barriers upon request.