Reinforced Polythene Building Membranes
Heavy duty Radon DPM damp proof membrane

Grade 870 is suitable for use as a radon barrier, and as a damp-proof membrane in floor constructions. It can be installed over or under concrete ground floor slabs with or without insulation.It can also be used for remedial work and with timber or concrete suspended floors.

Construction

Grade 870 is a multilayer composite membrane with polythene for toughness and water resistance and a multifilament polyester reinforcement for high tear resistance. Grade 870 is a flexible sheet material with a smooth surface and a regular grid-pattern surface texture. It is mid-green on both sides for easy on-site identification.

Technical Data

Basis Weight (g/m2)		319 g
Tensile Strength	-MD	9.8 kN/m
	-CD	10.0 kN/m
Nail Tear Resistance	-MD	170 N
	-CD	200 N
MVTR		0.37 g/m2/d
Vapour Resistance		560 MNs/g
Radon permeability		10.6(10-12m2s-1)
Improvement factor		approx 100

Grade 870 is approved to the Irish Agrement Board standard IAB99/0104

Fixing/Sitework

Store rolls on sides under cover until needed. Cover entire site with membrane, overlapping joints 100mm and sealing with a suitable butyl double-sided adhesive tape. Seal around all services through the membrane with a suitable flashing tape, or use "top hat" seals. Carry edges of membrane under DPC of external walls. Repair or replace any damaged areas before covering with concrete.

Please note: the performance of the radon barrier will only be effective if the membrane is effectively gas-tight. Inadequate seams and poorly sealed service entries will allow radon into the completed building.

Availability

Standard Roll Size	2000mm x 50m
Roll Weight	35kg

All information given in good faith and is believed to be accurate. Technical data is based on laboratory testing and represents average values. Specific lots may vary above or below these values.