features
- Exceptional nail tear and strength
- 3 weight options available
- Highly vapour permeable
- Condensation control
- Complies with BS5534:2014
ideal for
- Warm roof structures
- Cold roof structures
guidance
Refer to the Harcon VPU installation guide for complete installation instructions.
Material
The 125gsm membrane has a 3 layer composite structure with the vapour permeable film bonded between two layers of non-woven polypropylene.
VPU Weight Options:
- 92gsm budget weight
- 125gsm standard weight
- 230gsm heavy weight
Harcon VPU Taping Requirements
Recent changes to BS 5534: 2014 (Code of practice for slating and tiling for pitched roofs and vertical cladding) relating to wind uplift requirements, now require some membranes to be taped in highly exposed locations. Refer to tables for the appropriate taping requirements for Harcon VPU range of membranes.
| Material Properties |
230gsm |
125gsm |
102gsm |
| Thickness (mm) |
0.75 |
0.50
|
0.40
|
| Mass per unit area (g.m-2) |
230 |
125 |
102 |
| Roll length (m) |
50 |
50
|
50
|
| Roll width (m) |
1/1.5 |
1/1.5
|
1
|
| Colour |
Grey |
Blue |
Grey |
|
Tensile strength (N.50 mm-1)
Longitudinal
Transverse
|
470
300
|
285
165
|
250
140
|
|
Elongation (%)
Longitudinal
Transverse
|
70
100
|
70
90
|
60
70
|
|
Tear Resistance (N)
Longitudinal
Transverse
|
300
390
|
125
120
|
100
95
|
|
Watertightness
Unaged
Aged
|
W1
W1
|
W1
W1
|
W1
W1
|
| Water vapour transmission (Sd) (m) |
0.029 |
0.029 |
0.029 |
| Vapour resistance (MN.s.g-1) |
0.145 |
0.145
|
0.145 |
| Fire Properties (EN 11925-2 : 2002) |
Class D, d2 |
Class D, d2 |
Class D, d2 |
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