Can someone advise me of a solution for this

[LeeJC]

Do i need to replace the whole run of wood or can i chop out the rotten bit and replace that??

 

[masona]

I'm a bit confused here, what is it and where?

 

[LeeJC]

Sorry

It's a back room upstairs in my house, the piece of wood you can see with the holes drilled in the bottom used to extend the entire length of the wall sitting on the brick, however water has eaten into it and rotted the section away, when i removed the sloping ceiling, the bit you can see on the right pointing into the room came with the plaster.

The wood runs under the ends of the roof timbers, i`ll try and get a better photograph.

 

[LeeJC]

Does this make it any clearer????

 

[masona]

okay, you may need to cut it back on the next rafter as well and use a half lap joint, screw and glued

Don't forget to support the rafters

 

[Deluks]

Did you find out/fix why it rotted in the first place? missing tile or flashing? What's the blue stuff?

 

[masona]

What's the blue stuff?

I think it's bubble wrap, maybe just temporary as there's no tile battens?

 

[LeeJC]

The blue stuff is from my understanding a waterproof membrane, there are no batons because the original were slate tiles and they have been replaced with interlocking cement tiles which don't appear to require the batons.

So cutting it back to the next rafter and replacing the section is acceptable, cheers that's what i was after really.

edit (ignore the bit about batons, clearly close to darwin award stupidity, they must be in there somewhere.

 

[Deluks]

The blue stuff is from my understanding a waterproof membrane, there are no batons because the original were slate tiles and they have been replaced with interlocking cement tiles which don't appear to require the batons.

So cutting it back to the next rafter and replacing the section is acceptable, cheers that's what i was after really.

edit (ignore the bit about batons, clearly close to darwin award stupidity, they must be in there somewhere.

The rotting joists could've been caused by condensation on the underneath of the membrane. trapped in the rafter void it would have nowhere to go but soak into the timber causing the rot. If the membrane is doing it's job then water wouldn't be coming from above. When you replace the plasterboard be sure to use foil backed.