use
One-Way (Maximum)is an aspirating
roofing underlay for non-ventilated
pitched roof systems.The ‘Maximum ’
suffix qualifies this is the heaviest
aspirating underlay available.
The performance is very similar to
One-Way (Heavy Duty),but the
thermally bonded structure is
thickened.One-Way (Maximum)
provides the strongest possible
protection and the highest possible
resistance against tearing and ripping.
introduction
One-Way (Maximum)is suitable
for use in all warm and cold-
pitched roof applications.Moisture
vapour generated within a property
can safely ventilate through One-
Way (Maximum).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 12.375 kg per roll.
•Colour dark blue
•Construction 3 layer PP.
•Thermally bonded.(not reliant on
glue for stability or weight).
•Weight 165 gm²
•Strength (nail tear N)220/220
•Vapour resistance 0.21MNs/g
(breathability).
•Water resistance hydrostatic
head >700cm H20.
•Elongation MD/CD,%50/60.
•Tensile MD/CD,%330/250.
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