Cutting roof rafter

[lostinthelight]

Hi, wasnt quite sure which section to put this in but hope someone able to advise will find
I looking into the possibilities of getting a flue pipe through into the loft space and in doing so would need to take 300mm out of a roof joist to make way.
As I hope you can see from the pics the next joist was cut and framed for a loft hatch when the roof was done in the 70’s and is a cut roof . The joint between the hatch framing and joist would be lost as well if a piece was removed.
Many thanks for any help.

 

[catlad]

Hi Lost
If you could stand the hatch being bigger? where your ladders are leaning you could move the trimmer back say 8 inch or so.

 

[lostinthelight]

Hi thanks for that catlad. I may not of explained fully but where I have the red circle is the position the flue has to come through the ceiling which means cutting the joist even if the opening was moved back if that makes sense?

 

[catlad]

Yes I understand! so just make the new trimmer extend past that one to the one left of that where there is another joist 6 inches away. You will have to do something similar behind which I can't see.

 

[lostinthelight]

Yes I understand! so just make the new trimmer extend past that one to the one left of that where there is another joist 6 inches away. You will have to do something similar behind which I can't see.

Thanks, if you mean the wood thats runs along the wall thats not a joist or structural but is a piece to fix the ends of the plasterboard to.

 

[catlad]

Ahh ok a couple more options then, continue the trimmer past the non structural piece of timber and use a joist hangar or cut a sort of pocket into the masonry to accept the trimmer.

 

[lostinthelight]

Well i've done some reinforcing with 4x2 c24 and a length of old stuff I had here which is far better timber, I could just drop a hanger down before I cut the joist?

 

[catlad]

That looks a lot stronger, Why not put a piece of ply over the new timber where your ladder is? make it even stronger and somewhere to step of the ladder when entering your loft space. Hangers a good option.

 

[lostinthelight]

That looks a lot stronger, Why not put a piece of ply over the new timber where your ladder is? make it even stronger and somewhere to step of the ladder when entering your loft space. Hangers a good option.

If you mean where I think you do , the new flue will be blocking that area off

 

[catlad]

Ahh ok I was getting disorientated.