Enter the finished roof size and tell us what each edge meets. If your roof has a skylight or membrane join, tick the optional details box and we’ll include those materials too.
400mm membrane allowance built in
Detail products calculated for you
Current Wern-Wood prices
1. Roof size
Measure the finished roof deck. The calculator allows at least 200mm of membrane beyond each roof edge and increases this where a taller wall or tile/slate upstand is entered.
Roof layout — viewed from above
2. What does each roof edge meet?
Choose the real construction detail. The calculator works out the membrane, adhesive and trim materials for the options shown.
Enter the height of EPDM bonded up the wall/upstand or under the tiles/slates.
Enter the height of EPDM bonded up the wall/upstand or under the tiles/slates.
Enter the height of EPDM bonded up the wall/upstand or under the tiles/slates.
Enter the height of EPDM bonded up the wall/upstand or under the tiles/slates.
Roof details
Add only the details your roof has. The calculator works out the compatible contact adhesive, primer and tape automatically.
Enter the number of skylights.
Leave at 0 for a one-piece roof. A join adds the required seam tape and primer.
Primer is added automatically when the selected Techno tape detail needs it.
The calculator now works from the roof detail, not product knowledge
Edges are described by what they meet
Choose gutter, open fascia, wall/upstand or tiles/slates. The calculator converts that into trims, contact adhesive and corner flashing.
Skylights and joins size their own consumables
Skylight dimensions calculate the contact-bonded upstand area. Membrane joins calculate the required seam tape and primer.
Wall, tile and skylight details calculated for you
Select the roof detail and enter the height or dimensions. The calculator works out the extra membrane, contact adhesive, primer and tape required by the selected detail.
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