Eco Plus

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.






Warm & Cold pitched roofs

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.

BRE Approved

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

Lightweight breathable
roof underlay

zone map

Product Data

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

Quality Assurance

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)

Technical Data

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

Roof Space Ventilation

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.

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.