use
One-Way (Heavy Duty)is an
aspirating roofing underlay for non-
ventilated pitched roof systems.One-
Way may be used in non-ventilated
cold roof and most warm roof
applications when comprising one
part of a pitched roof system.
introduction
On pitched roofs this product may be
used instead of conventional underlay
felt.It provides tough and durable
protection from the weather of the
area covered,having been tested in
terms of strength,stabilisation and
resistance to water.(One-Way Heavy
Duty supports 6 metres of water).
Importantly One-Way permits the
roof to breathe.Moisture vapour
generated within a property can
safely ventilate through One-Way
(Heavy Duty).The aspirating benefit
is capable of venting over five times
the moisture generated within a
typical house.Thus this product can
be used to satisfy the protection,
ventilation and vapour aspirating
qualities demanded by the Building
Regulations and provides an
alternative to the use of conventional
ventilation products and methods.
general
This material has been tested to
meet/contribute to the requirements
of Building Regulations (England
and Wales)2000,C4 ,Regulation 7.
Building Standards (Scotland)
Regulations 1990 ,Regulation 10,
B2.1,B2.2,G3.1.Building Regulations
(Northern Ireland)B2 and C4.
One-Way aspirating underlay may
also be used as a supported or
unsupported underlay in tiled and
slated roofs constructed in
accordance with BS 5534.Always
consider the complete roof
construction (from ceiling boards to
roof tiles)with regard condensation
risk.Install only in accordance with
our installation instructions that
accompany every order.
data
•Size 50m x 1.5m or 75m x 1m
(75 sq metres per roll).
•Weight 10.9 kg per roll.
•Colour dark blue
•Construction 3 layer PP.
•Thermally bonded.(not reliant
on glue for stability or weight).
•Weight 130 gm²
•Strength (nail tear N)110/90
•Vapour resistance 0.19MNs/g
(breathability).
•Water resistance hydrostatic
head >600cm H20.
•Elongation MD/CD,%60/60.
•Tensile MD/CD,%250/190.
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