Cutting edge of roofing "joist"

opps · 29 Nov 2021

Hi all

I am about to decorate a bathroom. The house is end of terrace. The roof is pitched in three planes. That is to say, it doesn't have a gable end.

Part of the corner roofing "joist" is visible in the corner of the room where the two external walls meet (sorry- not sure of the correct name).

I am guessing that it is notched and sits on a length of timber that spans the top course of bricks. Would it be ok to use an oscillating saw to trim away the visible part?

I was hoping to remove the visible part and then chisel off another mm or two before filling.

tell80 · 29 Nov 2021

No, why not leave it as it is until you take gable roof pics from ground level outside and from in the loft & post them on here because it could be a hip rafter thats just penetrated that corner as it goes to meet the angle of two wall plates?
Whatever it is its already been hacked about - play safe and dont weaken it any more.

^woody^ · 29 Nov 2021

That's the hip rafter seat, and you should assess the timber section before cutting it, although it may well be OK to cut.

But then the issue becomes whether you create a cold spot in the plaster which develops a stain.

Harry Bloomfield · 29 Nov 2021

Could you not add a lower ceiling instead? A few extra timbers and plasterboard over the top.

datarebal · 29 Nov 2021

My first thought was it's a surplus piece of the hip .
It looks odd for that. I'd check before I cut

catlad · 29 Nov 2021

Insulated plasterboard on the ceiling would have done the trick, which is what you should be doing really!

RandomGrinch · 30 Nov 2021

Just put up some coving?

opps · 30 Nov 2021

Hi all

I shall take better photos with dimensions and post back.

It isn't my house, I am decorating the room. And no, I did not do the plastering. The ceiling is lathe and plaster which has been over boarded and skimmed.

Additional thanks to each of you that mentioned the words hip rafter I now know what it is called.

catlad · 30 Nov 2021

whether you did it or not you could have got rid of your problem with the relevant insulated plasterboard which is the way forward regarding modernising an old terraced house without the need to start cutting main beams in a house.

opps · 1 Dec 2021

catlad said:
whether you did it or not you could have got rid of your problem with the relevant insulated plasterboard which is the way forward regarding modernising an old terraced house without the need to start cutting main beams in a house.

Yeah, I have no idea why they didn't go back to brick on the exterior walls and use insulated plasterboard. I only got called in after my mate realised that the decorators that his GF insisted upon were pants.

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Cutting edge of roofing "joist"

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