skylight - roof alterations / building control submission

[Moonshine]

i am looking to put a skylight / velux in a pitched roof and need a bit of what information building control needs and what alterations need to be made to the roof.

 

The roof it 4 inch rafters at 400 cts

 

This is a photo front a few years ago when we stripped it out internally and we battened out the rafters by 50mm so we could put 100mm insulation in the cavity and still have 50mm ventilation gap above the insulation.

 

 

what do i need to do structurally to put the skylight in?

Edited February 6 by Moonshine

[Redbeard]

Usually double-up the rafters either side and trim across as required, but don't take my word for it! Ask your BCO. I have seen 'standard requirements' vary from place to place.

[Moonshine]

On 06/02/2024 at 17:33, Redbeard said:

Usually double-up the rafters either side and trim across as required, but don't take my word for it! Ask your BCO. I have seen 'standard requirements' vary from place to place.

 

I have spoken with building control and its double rafters and trimmers, the double rafters need to extend to the load points (e.g. purlins).

 

I need to come up with a plan of how to get the double rafters in with minimal disruption as the room is plaster boarded. I am wondering if i can get access from outside to put the rafters in by removing roof tiles and  the cutting sections of batten away.