SINTEF Certification
No.
20016
01.09.2009
03.11.2009
Valid until: 01.09.2014
Page:
1 of 5
Issued t:
Revised:
SINTEF Building and Infrastructure confirms that
Vempro R+ combined roof underlayer and wind barrier
meets the provisions regarding product documentation given in Norwegian building
regulations, with properties, fields of application and conditions as stated in this document
1. Holder of the approval
DOW Europe GmbH
Bachtobelstrasse 3
CH 8810 Horgen
Switzerland
http://goliath.ecnext.com
2. Manufacturer
DOW Europe GmbH
Bachtobelstrasse 3
CH 8810 Horgen
Switzerland
3. Product description
Vempro R+ combined roof underlayer and wind barrier is
made from spun bonded nonwoven polypropylene fabric
and polypropylene film. The product is UV-stabilized, and
intended for use as a combined roofing underlay and an
airtight breathable membrane. The weight is about
225 g/m² and the colour is blue.
Vempro R+ is supplied as rolls of standard widths of
1,50 m and length of 50 m. Vempro R + has a 50 mm wide
adhesive strip at one edge on the top side, and at the
opposite edge on the underside. The adhesive strips consist
of a heat-melting glue.
As supplement to the product the following components
can be delivered:
− Vempro Tape (Vempro repair tape)
− Glava Tettlett
− Glava Dobbeltsidig Tettebånd
− Glava Monteringslim
− Glava Kilrennemembran
− Glava Bunnfyllingslist
4. Fields of application
Vempro R+ is used as a wind barrier in thermal insulated
wooden walls and roof constructions, and as a combined
roofing underlay and wind barrier in thermal insulated,
pitched wooden roofs with ventilated, discontinuous
roofing and external drainage, see Fig. 2.
Fig. 1
Installing Vempro R+ with adhered joints mounted
crosswise on the rafters or the roof trusses. End joints have
to be clamped and folded above the rafters as shown in the
figure segment above.
The product is particularly suitable for roofs with
continuous thermal insulation from eaves to ridge. Vempro
R+ may also be applied in pitched wooden roofs with
heated rooms in parts of the attic, and above uninsulated
attic spaces.
The product may also be used in combination with wooden
roof sheathing, f.ex. for renovation of old roofs with
thermal insulation in the plane of the roof. See chapt. 6
Special conditions for use and installation.
5. Properties
Material properties
Material and construction properties are shown in Table 1.
Vempro R+ complies with the requirements recommended
by SINTEF Building and Infrastructure concerning water
tightness, air tightness and water vapour permeability.
SINTEF is Norwegian member of European Organisation for Technical Approvals, EOTA, and European Union of Agrément, UEAtc
Reference: Appr. 3D0226
Contr. 3D0765
Head Office:
SINTEF Building and Infrastructure
P.O.Box 124 Blindern – NO 0314 Oslo
Tel. + 47 22 96 55 55 – Fax + 47 22 69 94 38
© Copyright SINTEF Byggforsk
Subject:Combined roof underlay and wind barrier
e-mail: byggforsk@sintef.no
www.sintef.no/byggforsk
Trondheim:
SINTEF Building and Infrastructure
7465 Trondheim
Tel. +47 73 59 30 00/33 90 – Fax +47 73 59 33 50/80
SINTEF Technical Approval - No.
20016
Page 2 of 5
Table 1
Vempro R+ combined roof underlayer and wind barrier
Material and construction data.
Test
Property
Value
method
Water tightness, Water pressure
Rain tightness,
construction
Air tightness,
material
Air tightness,
construction
1)
Tight at 2 kPa
Class W1
Tight at 15º slope
and 400 Pa pressure
2)
difference
0,002 m³/(m²hPa)
1)
0,002 m³/(m²hPa)
2)
EN 1928
NT Build 421
Equivalent to
NS 3261
EN 12114
9
Water vapour
resistance
Concentrated load
resistance
Fig. 2
Basic roof construction using Vempro R+ as a combined
roof underlayer and wind barrier
Durability
Vempro R+ is considered to have satisfactory durability as
long as the product is not exposed to direct sunlight.
The durability has been tested by artificial weathering/
ageing according to EN 13859-1 and NT Build 495, with
testing of water tightness and tensile properties before and
after the exposure.
Concentrated load resistance
Based on performed tests and provided installation
according to clause 6, Vempro R+ is considered to have
sufficient resistance against “tread through” during the
construction period.
Environmental declaration
No environmental declaration according to ISO 21930 has
been worked out for Vempro R+. The product contains no
chemical substances listed on the Norwegian
environmental authority’s observation list of compounds
hazardous to human health or the environment.
Waste handling / recycling
The product may be sent to ordinary public waste deposits
after the end of its working life, and can alternatively be
recirculated (material- and energy recycling).
6. Special conditions for use and installation
General
Vempro R+ shall be installed in a way that provides both
an airtight and a watertight layer. The application shall
follow the principles showed in Building Research Design
Sheet no. 525.102 and the instructions given by the
manufacturer.
Tensile strength
- Longitudinal
- Transversal
Elongation at break
- Longitudinal
- Transversal
Dimensional stability,
- Longitudinal
- Transversal
Tear resistance
(nail shank)
- Longitudinal
- Transversal
Inflammability
1)
2)
0,16 ⋅ 10 (m²sPa)/kg
EN ISO 12752
1)
Sd-value = 0,03 m
(50/93
% RH, 23°C)
(air thickness eqv.)
2,5 kN
2)
SP0487
1)
500 N/50 mm
1)
500 N/50 mm
EN 12311-1 and
EN 13859
EN 12311-1 and
EN 13859
1)
50 %
1)
50 %
2)
< - 0,2 %
2)
< 0,1 %
2)
255 N
2)
255 N
Inflammable
EN 1107-1
EN 12310-1
ISO 1182
Limits for control testing
Determined by type testing
Design considerations
Combined roofing underlays and wind barriers should not
be used at very exposed places where experience show that
drifting snow often may be accumulated between the
roofing and the roofing underlay.
The roof pitch must be minimum 15°.
The wall cladding and the roofing should be laid as soon
as possible after Vempro R+ has been installed, in order to
prevent that the underlay is freely exposed for a longer
period of time. Thermal insulation, vapour barrier and the
ceiling shall not be installed until the roofing has been
layed and the underlay is checked to be properly mounted.
Installation
Vempro R+ shall be installed crosswise the rafters as
shown in Fig. 1. The roof underlayer shall be installed
continuously from gable to gable and the installation shall
always start at the eave. The adhesive strips must adhere
continuously to each other along all horizontal joints. Any
transversal overlap joints must be folded and clamped
above the rafters as shown in Fig. 1.
SINTEF Technical Approval - No.
20016
Use of the butyl rubber based Glava Dobbeltsidig
Tettebånd beneath the battens increases protection against
leaks through the nail holes. Glava Dobbeltsidig Tettebånd
is recommended for use in locations exposed to high wind,
and will decrease the danger of snow accumulation in the
roof construction.
Smaller holes in the roof underlay can be repaired from the
outside with sheets of Vempro R + bonded with Glava
Monteringslim. Smaller holes can be repaired from the
inside with Vempro Tape.
In order to minimize the pressure at the overlaps due to
shrinkage of the rafters, the moisture content of the rafters
should be less than 20% when installed.
Overlapping joints, connections to other components and
structures
Vempro R + has a felted underside. Therefore the
overlapping joints will not have satisfactory air- and rain
tightness as given in Table 1. To ensure sufficient tightness
of transversal joints above the rafters and at the ridge,
Vempro R+ has to be folded and clamped above the rafters
as shown in figure segment in figure 1. In addition, Glava
Monteringslim and Glava Dobbeltsideig Tettebånd can be
used in overlapping joints in connection to for instance
valley gutters and bushings.
Page 3 of 5
Connections to other components and structures
Vempro R+ shall be installed with airtight connections to
the wind barrier of exterior walls, and with airtight joints
at the ridge and connections between separate roof planes.
Connections towards openings in the roof such as roof
windows, chimneys etc. must also be made both waterand airtight. Connections to the wind barrier are shown in
Fig. 3 and 4.
To avoid the risk of fluttering noise Vempro R+ should not
be installed at large eaves where the roof underlay can
move freely.
Bushings
Installed bushings like chimneys, skylights, pipes etc. shall
be performed in such way that they are air- and watertight.
Fig 5 shows an example of a chimney bushing.
Roofs with attics
Vempro R+ has sufficient low vapour resistance to be used
as roofing underlay in non-ventilated attic spaces, see
Building Research Design Sheet no. 525.102.
Using wooden sheeting made of plywood or OSB-boards,
the water vapour resistance has to be documented. Total
water vapour resistance for all the layers in the under roof
shall not exceed Sd-value = 0,5 m.
Dimensions of counter battens and ventilation space
The roofing shall have a ventilated space between the
roofing and the underlay. For roofs with a maximum
length between eaves and ridge of approx. 7 m the
following minimum thicknesses of counter battens should
be used depending on the roof pitch α:
Pitch < 34°:
Pitch 34° - 39°:
Pitch ≥ 40°:
36 mm
30 mm
23 mm
For larger roofs the distance between the underlay and the
roofing battens should be increased, see Building Research
Design Sheet no. 525.102.
The counter battens are cut just below the adhesive strip
and are fixed gradually during the installation of the roof
underlayer.
Maximum thickness of the counter battens used for
clamping shall be 36 mm.
The counter battens shall be fixed by screws or nails
spaced at maximum 300 mm. It is recommended to use
screws with plain shank on the part which penetrates the
counter battens. For roof pitches below 18º, alternatively
3,1 mm hot galvanized square nails can be used or also
grooved nails with a length of 2,5 times the thickness of
the counter battens.
Fig 3
Example of connection between roof and external wall
where the rafters do not extend outside the plane of the
wall. Vempro R+ is installed continuously over the front
edge plate and is clamped to Vempro Wind barrier at the
wall.
SINTEF Technical Approval - No.
20016
Fig 4
Example of connection between roof and external wall
where the rafters extend outside the plane of the wall.
Vempro R+ is folded around the rafter edge and clamped to
Vempro Wind barrier at the wall.
Page 4 of 5
Fig. 6
Breathable roofing underlay placed on sarking board, with
thermal insulation beneath. The overlap joints are
continually clamped between battens and counter battens
to ensure air- and water tightness.
Fig. 7
Vempro R+ installed on a plane surface and wooden board
sheeting, which is insulated on the beneath side, using
Glava Dobbeltsidig Tettebånd.
Fig. 5
Example of assembling a chimney bushing with use of
Glava Tettlett
Combination with wooden board sheeting
Vempro R+ may be applied as roofing underlay in
combination with wooden board sheeting provided a total
water vapour resistance of maximum Sd-value = 0,5 m.
Vempro R+ can be assembled directly to wooden board
sheetings made of spruce or pine in old roofs which are
reconstructed and insulated. The insulation can then be
placed as shown in Fig. 6 and 7 after the old roofing has
been removed.
When reconstructing old roofs, the old, not breathable,
roofing must be removed. Wooden battens have to be used
beneath the overlapping joints to ensure adequate air
tightness, se Fig. 6. This is even more important in cases
where the substrate is irregular and when the joints are
crosswise located on the wooden board sheetings. Wooden
board sheetings beneath the counter battens, as shown i
Fig. 6, decreases the risk of air leakage through screw- and
nail holes. The counter battens can be left out provided use
of Glava Dobbeltsidig Tettebånd, and a plane substrate
which ensures sufficient clamping of the roofing underlay,
see Fig. 7. Counter battens should be fixed by use of
screws with plain shank on the part which penetrates the
counter battens.
7. Factory production control
Vempro R+ is subject to supervisory factory production
and product control according to contract between
SINTEF Building and Infrastructure and DOW Europe
concerning this Technical Approval.
SINTEF Technical Approval - No.
20016
Page 5 of 5
The manufacturer’s quality management system is
certified by Lloyd’s Register Quality Assurance according
to ISO 9001:2000, certificate No. GBG0000094.
Glava AS has a quality management system which is
certified by Nemco AS according to ISO 9001 and ISO
14001, certificate No. 801014.
8. Basis for the approval
The approval is mainly based on verification of product
properties from type testing documented in the following
reports:
- SINTEF Building and Infrastructure: Report
3D0226.01-A, dated 13.07.2009 (material and
construction properties)
- SP Technical Research Institute of Sweden: Report
P804061 rev1 dated 15.10.2009 (concentrated load
resistance)
- tBU: Report 1.1 / 11400 / 589. 0.1.2006, dated
06.02.2007 (material properties)
- tBU: Report 1.1 / 11400 / 0203. 1.1.2009, dated
21.06.2009 (material properties)
- tBU:
Report
1.3/11400/0743.0.1-2009,
dated
01.09.2009 (material properties)
TG 20016
Approval mark
10. Liability
The holder/manufacturer has sole product responsibility
according to existing law. Claims resulting from the use of
the product cannot be brought against SINTEF beyond the
provisions of Norwegian Standard NS 8402
11. Technical management
Project manager for this approval is Noralf Bakken
SINTEF Building and Infrastructure, dep. Trondheim
9. Marking
Vempro R+ combined roofing underlay and wind barrier
shall be marked on the packaging with the brand image of
DOW/Glava and the manufacturer’s product name,
Vempro R+, printed on the product. The product is also
labeled with product type and production number. The
approval mark for Technical Approval No. 20016 may
also be used.
for SINTEF Building and Infrastructure
Steinar K. Nilsen
Approval Manager