Advantages
  • BBA certified
  • Cold & Warm roof application
  • 3 layer spun-bonded membrane
  • Clean and easy to use
  • High performance & flexibility
  • Excellent tensile strength
  • No gusting wind noise
  • UV stable for up to 3 months
  • Excellent nail tear resistance

BS5534:2018 Wind Uplift
Each individual Vent3® underlay product has the batten gauge & zonal application for wind uplift printed on this packaging. The manufacturers declared values are available from the Cromar website. The Vent3® underlays may be used at any batten gauge in all wind zones when laid over nominally air-tight sheet sarking for example OSB, plywood, chipboard and insulation for warm-roof design. They may also be used in applications where slates are nailed directly onto sarking boards. Sarking boards, such as square-edged butt jointed planks, are not considered to be air-tight and the underlay is treated as unsupported.

Zone suitability applies only for underlays in applications where a well-sealed ceiling is present, ridge height is not greater than 15 m, roof pitch is between 12.5° and 75°, site altitude is not greater than 100 m, and no significant site topography is present. Other applications might require underlays with greater wind uplift resistance and it is advisable to seek professional advice. Zones 3 and 4 apply to Northern Ireland.

A range of high performance breathable roof underlays for cold and warm roof application.

Vent3® PRO.
Heavyweight performance breathable underlay.

A heavyweight high performance breathable membrane suitable for cold and warm roof applications, providing huge benefits over traditional roof underlays.

Colour Size Product Code Pallet Qty Barcode

Green
1m x 50m
1.5m x 50m
TV3P/50
TV3P/75
56
48
5036684004138
5036684004145
Batten Gauge Fixing Zone Suitability BBA
≤345mm
≤345mm
≤250mm
Lap Fixing
Taped
Lap Fixing
1-4
1-5
1-5

Vent3® 
High performance breathable underlay.

A high performance breathable membrane ideal for cold and warm roof application.

Colour Size Product Code Pallet Qty Barcode

Blue
1m x 25m
1m x 50m
1.5m x 50m
TV3/25
TV3/50
TV3/75
104
56
48
5036684003926
5036684002974
5036684003193
Batten Gauge Fixing Zone Suitability BBA
≤345mm
≤345mm
≤250mm
Lap Fixing
Taped
Lap Fixing
1-3
1-5
1-5

Vent3® Classic
High performance breathable underlay.

A breathable roof underlay for cold and warm roof applications which give major benefits over traditional roof underlays.

Colour Size Product Code Pallet Qty Barcode

Grey
1m x 25m
1m x 50m
1.5m x 50m
TV3C/25
TV3C/50
TVC3/75
104
56
48
5036684003902
5036684003216
5036684003209
Batten Gauge Fixing Zone Suitability BBA
≤345mm
≤345mm
≤250mm
Lap Fixing
Taped
Lap Fixing
1-3
1-5
1-5

Vent3® Light
Lightweight performance breathable underlay.

A lightweight breathable roof underlay for cold and warm roof applications, providing major benefits over traditional roof underlays.

Colour Size Product Code Pallet Qty Barcode

Dark Grey
1m x 25m
1m x 50m
1.5m x 50m
TV3L/25
TV3L/50
TV3L/75
104
56
56
5036684003889
5036684003834
5036684003841
Batten Gauge Fixing Zone Suitability BBA
≤345mm
≤345mm
≤250mm
Lap Fixing
Taped
Lap Fixing
1
1-5
1-5