Splicing rafter sister beams

[Ramaya]

Hi, I am looking to reinforced the rafters in order to fit a Velux window. The problem I have is my current rafters are 4.6m long and there is no way physically to fit a 4.6m continuous timber into the attic. Is there a standard method for splicing two pieces of timber before bolting it onto the existing rafters?

Thanks

 

[Deleted member 174758]

You don't splice, you sister the joists onto the existing. Providing your joints don't overlap (assuming one joist and two sisters) you should be OK. What does your S/E say they want?

 

[foxhole]

You have to remove tiles for velux so you can put timbers thru the hole.

 

[catlad]

Normally you just need it to go from the ridge to beyond the purlin, or as far as you can.