BBA Agrément Certificate
High density polyethylene combined cavity former and vapour barriers for drained BS 8102:2009 Type C basement construction. Forming drained cavities horizontally & vertically.
A range of high density, high strength, chemically resistant polyethylene drained cavity formers designed to reduce the risk of water ingress beneath floor screeds and between concrete and blockwork walls to form an efficient drained cavity to new and existing sub-structures.
When installed against the internal face of concrete floors and walls, Hydroduct® CF will provide a continuous drainage path which must link to the site internal drainage system. Not suitable for internal applications where no linking with the site drainage system is possible.
Hydroduct® CF forms part of a Type C structure (drained protection) as described in BS 8102.
The cavity formers are compatible with all cementitious, bituminous and polyethylene building materials.
Floor slabs should ideally be laid to falls to drainage gully or outlets. A flat slab is acceptable providing there are no adverse falls and low spots are infilled. Where surface irregularities exceed 5 mm, cut back and make good.
– Walls: Overlap all vertical joints:
– Floors: Interlock four dimples.
Seal all joints with Servitape double sided adhesive tape. Seal all penetrations through with Servijoint One DW sealant.
High density polyethylene
2.0 x 20.0 m / roll
2.0 x 20.0 m
J40/290 High density polyethylene/ polypropylene studded cavity drain membrane
Hydroduct® CF 08
Designed to form drained cavities vertically in lower risk applications.
Hydroduct® CF 20
Designed to form drained cavities horizontally and vertically.
Standard product features
Vertical drainage capacity: