WEBUV technical data
Product data
Composition: bi-stretched
micro-porous PP film protected
between two layers of
UV stabilised PP nonwoven
Thickness: 0.4mm
Weight g/m
UV10
UV15
UV25
112
130
165
50
50
50
2
Roll length metres
Roll width metres
Roll weight kg
Performance
1
1.5
1
1.5
5.6
8.4
6.5
9.8
1
WEBUV
High performance
breathable underlays
1.5
8.3 11.6
UV stability: stable up to
3 months outdoor exposure
UV10
UV15
UV25
Breathability (MVTR)
g/m2.day
983
1079
975
Water vapour resistance
VrMN.s/g
0.21
0.19
0.21
Web Dynamics offers free technical support
to all users of WEBUV membranes.
Watertightness
m water
4.5
6.7
8.8
Contact the technical help line on
Tensile strength
MD N/50mm
221
255
339
Tensile strength
CD N/50mm
177
192
258
Nail tear
N, MD
105
135
190
Nail tear
N, CD
120
155
240
WEBUV help and advice
Full installation instructions included in roll
01204 674 730
or visit www.webdynamics.co.uk
WEBUV stockists
Highly breathable
Strong
Watertight
Overlap
12.5 –14°
225
150
100
15 –34°
150
100
100
>34°
100
75
100
Durable
Energy efficient
Web Dynamics Ltd
Moss Lane
Blackrod
Bolton
Lancashire BL6 5JB
t 01204 695 666
© Web Dynamics Ltd 2008
BBA certified
Made in the UK
WebUV 2009/5
Horizontal lap
Vertical lap
mm
mm
Partially
Fully
Roof pitch supported supported
WEBUV breather
membranes
WEBUV installation
WEBUV installation
Cold, non-ventilated roof
Warm roof
contain a high quality micro-porous film protected
between two layers of nonwoven polypropylene
This type of roof is not ventilated and has insulation
fitted at ceiling level between joists.
Warm roofs contain insulation below or between
rafters.
The micro-porous film is stretched in two directions,
and contains less chalk than cheaper, low quality
films. This gives WEBUV membranes a unique
combination of high breathability and
watertightness.
Taut roof structure
Taut roof structure
When WEBUV membranes are supported on sarking,
or are unsupported and pulled taut across rafters,
then counter battens must be fitted above the
membranes then tiling battens. This creates a
channel for water to run down the membranes
and into the gutter.
When the rafter space is fully filled with insulation,
the WEBUV membranes are pulled taut across the
rafters in contact with the insulation. Counter
battens must be fitted above the membranes
then tiling battens.
Draped roof structure
Draped roof structure
When WEBUV membranes are unsupported
and draped 10mm down into the rafter space,
then tiling battens can be fitted directly above
the membrane.
When the rafter space is partially filled with
insulation, the WEBUV membranes should be draped
10mm down into the rafter space. Tiling battens
can be fitted directly above the membrane.
Roofs with WEBUV membranes do not need roof
space ventilation, making the roof more energy
efficient.
Polypropylene spunbond
provides strength and
protects the film
Waterproof,
breathable film is the
key functional layer
WEBUV breather
membranes
● are a secondary barrier against rain, snow or dust
that penetrates the outer tiles or slates
● allow the roof to breathe – water vapour
passes through, removing the need for
traditional ventilation
● reduce the risk of condensation in the roof
● reduce the risk of wind uplift of tiles or slates
● are BBA certified for use supported on sarking or
unsupported, in both warm and cold roofs, and
in timber frame walls