hi all,i'm putting a velux window in a small, lean-to, pitch roof, of which the span is 2200mm so i'm using 100mm depth rafters (according to building regs is fine for such a small span). will 100mm rafters be sufficient for the velux?
velux window
- Thread starter jonCar
- Start date
Sponsored Links
as Pete says, double up the rafters either side of the velux. 
Rule o' thumb: trimming rafters to each side of the velux = 1 + (cut rafters/2) eg 2 rafters cut for velux install = two trimming rafters either side. Wider velux sizes might need more than two trimming rafters; inadequate sizing results in dishing of the roof surface over time. Look at any number of terraced house roofs with velux cut in, for an example.
Sponsored Links
great thanks for your help
DIYnot Local
Staff member
If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Are you a trade or supplier? You can create your listing free at DIYnot Local
