Yep them 200 or 225 timbers now acting as 100
low pitch extension roof
- Thread starter dfk778
- Start date
Sponsored Links
Does it matter considering the small span and requiring thicker timber to match the steels thickness / insert insulation?
Seems a bit odd they didn't birds mouth any of them. The roof was built by roofers and passed by building control.
Not quite. It is crap but 100mm rafters wouldn't work. Max bending moment is at the centre (more or less) of the span and that's where the 200mm depth is working hardest. 100mm rafters in the same situation would deflect too much. The main issue with those seat cuts is shear force (which is highest at the supports) and the potential for splitting.
Sponsored Links
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