VapR-free is a multi layer laminate film composite made of polyolefin materials, resulting in a pitched roof underlay that has high vapour permeability but is also highly water resistant.
VapR-free Eco Plus is suitable for warm and cold pitched roofs in both commercial and domestic buildings. Manufactured without the use of CFC’s, VapR-free Eco Plus is 100% recyclable and is extremely durable with high tensile and nail tear strength properties. Excellent UV and heat stability properties will ensure that VapR-free Eco Plus has a life span in excess of 30 years.
VapR-free Eco Plus has been approved and tested in accordance with BS5534: Anex A 2015 – Wind Uplift Resistance and is suitable for use in: Wind Zones 1 - 3 with Battened lap Wind Zones 1 - 5 with a Taped Lap Wind Zones 1 - 5 with Integral Taped Lap
| Roll Width (linear m) | 1.0 | 1.5 |
| Roll Length (linear m) | 50 | 50 |
| Coverage/roll/m² | 50 | 75 |
| Roll weight/kgs | 6.6 | 9.9 |
| Rolls/Pallet | 49 | 42 |
BS 5534: Anex A1: 2015
Wind Uplift Resistance
VapR-free Eco Plus tested
wind uplift resistance (N/m2):
Zones: 1-3 with 345mm Batten gauge
Battened lap Exceeds 1150
Zones: 1-5 with 250mm Batten gauge
Battened lap Exceeds 1600
Zones: 1-5 with 345mm Batten gauge
Taped lap Exceeds 1600
Zones: 1-5 with 345mm Batten gauge
Integral Taped lap Exceeds 1600
(see zone map above)
| Property | Units | Value |
|---|---|---|
| Weight | g/m² | 132 |
| Water Vapour Resistance | Sd (M) | c.0.02 |
| MN/sg | 0.18 | |
| Water Vapour Transmission | g/m²/24 hr | 1112 |
| Fire Rating | - | EN13501-1: 2010 |
| Exposure Times UV Degradation | - | 3 months |
Prevention of Condensation
The complete roof construction, ceiling boards, underlay, insulation and roof tiles should be considered as a total roof system with regard to condensation risk, details of which can be found in our BBA certificate.
The risk of condensation is greatest during the first heating period when the moisture levels are high.
Roof Space Ventilation
The NHBC require that for all New Build Homes, ridge or high level ventilation is installed when a vapour permeable membrane such as VapR-free is used. We recommend the membrane should stop 5 to 30 mm from the apex of the roof and a ventilated dry ridge system be used to achieve the required level of ventilation.
General
VapR-free must be installed with the blue printed side face- up and overlapped with the minimum dimensions listed. Trimming is achieved with a sharp knife. When partially supported with a horizontal lap between battens, an extra batten should be introduced 25 mm above the bottom edge. This will restrain the lap from opening under wind uplift.
Weather Tightness
VapR-free is highly water resistant and prevents the ingress of wind driven rain. It can be used as a temporary roof covering and left exposed to the elements, however this period should be kept to a minimum.
Mercury Building Products Ltd
Unit 4 Traso Business Park
Callywhite Lane
Dronfield S18 2XR
01246 268 084
Mercury Building Products Ltd
114 Eckington Road
Coal Aston, Dronfield S18 3AY
Telephone: 01246 292 816