The picture below shows the ceiling joist starts 50mm away from the brickwork gable wall.
Replace roof top plate.
The second joist should still be 600mm to the center and so on so that the plasterboard.
If the new stud is too long it will push the top plate up and can affect the roof position.
This is to let the common rafter fit in between later.
Amazon link to dewalt framing nailer kit we use.
Then replace with studs not another header.
The national average cost to replace a roof is 7 211 with most homeowners spending between 4 707 and 10 460 roof installation cost ranges from 400 to 550 per square depending on the roof size and materials used in reroofing.
If the new stud is too short it will not support the plate and roof.
The connection between the trusses and the wall top plate is essential to the strength of your new roof.
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Both boards seem to have some damage and should be replaced.
When constructing a gable roof the ceiling joists are laid out slightly differently.
In traditional framing the roof is built stick by stick.
This is a hip roof design and it looks like i should be able to get to it in the attic if i crawl out to it.
Cut new lumber to the length of the rotted studs.
Gable roof plate top layout.
Expect to spend 1 500 to 3 000 to remove your current roof before installing a replacement.
Matching the exact length of the studs is vital.
There are two 2x4 stacked on top of each other and i think there called top plate or upper wall plate.
I would cut the header first then the bottom of the top plates between the studs and then the top plate about 2 longer on both sides so you have an overlap.
Use the same type lumber as the rotted studs.
I was able to find an area on both ends where the damage stops.
The sill plate usually a treated 2 by 8 board rests flat on top of the foundation and the ledger board usually a 2 by 10 board rests upright on top of the sill plate in an upright position.