How many fascia boards do I need?

Divide your total roof perimeter by the board length. For a typical detached house with 24m of eaves using 5m boards, you need 5 fascia boards. Always round up and add extra for corners and joins.

What length fascia boards are available?

UK fascia boards typically come in 2.5m, 3m and 5m lengths. 5m boards are most efficient for long runs as they reduce the number of joints needed.

What width fascia board do I need?

The width depends on the depth of your rafter feet. Common UK sizes are 150mm, 175mm, 200mm and 225mm. Measure your existing fascia or rafter ends to determine the correct width.

TradeCalculator.co.uk

Fascia Board Calculator — Boards, Trims & Fixings

Calculate fascia boards needed for your roof perimeter. Includes corner trims, joining pieces and fixing screws.

Roof Perimeter Length

Total eaves perimeter of the roof

Board Length

Fascia Width

200mm is most common

Number of Corners

Typical house: 4 corners

How We Calculate This

This calculator divides your total roof perimeter by the fascia board length to determine how many boards you need. It then calculates corner trims, joining pieces and fixings.