Multifinish over expanding foam
- Thread starter furpho
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- expanding foam
furpho, good evening.
Personally do not fancy cutting such a channel because, each side of the "cut" would flap about and be very unstable.
if you have the space behind the plaster board then you might get away with cutting the channel, then fitting a floor to ceiling batten to each cut edge, the trick is that if you use say a 50mm2 timber you can have 25.mm to re-fix the cut side to + still have 25.mm to fix a "new" bit of plasterboard over the gap, making the repair simpler, even if you subsequently use lining paper as a further mask to the channel??
BUT? there is generally a "but" within the wall there will be [generally] two or possibly three horizontal bits of timber, intentionally placed there to adequately support the plasterboard over its height and width?? Leave them in place and fit the vertical new timber between them, the heating pipes may be able to fit on the "rear" of the horizontal pieces you may able to "fix" the pipes to the timber, it will assist in stopping water hammer??
Ken.
Personally do not fancy cutting such a channel because, each side of the "cut" would flap about and be very unstable.
if you have the space behind the plaster board then you might get away with cutting the channel, then fitting a floor to ceiling batten to each cut edge, the trick is that if you use say a 50mm2 timber you can have 25.mm to re-fix the cut side to + still have 25.mm to fix a "new" bit of plasterboard over the gap, making the repair simpler, even if you subsequently use lining paper as a further mask to the channel??
BUT? there is generally a "but" within the wall there will be [generally] two or possibly three horizontal bits of timber, intentionally placed there to adequately support the plasterboard over its height and width?? Leave them in place and fit the vertical new timber between them, the heating pipes may be able to fit on the "rear" of the horizontal pieces you may able to "fix" the pipes to the timber, it will assist in stopping water hammer??
Ken.
Evening Ken.. very good point about the flapping. I think I’m going to have to cut the channel and see what I find. I’m now wondering about expanding foam board adhesive. I’ve never seen it used but if it’s similar to expanding foam it could stop the flapping and fill the gap. Not sure if I can skim over it though
You can use foam and skim over it. The foams pretty sticky, so should also fill behind and to the side and adhere, eliminating the flapping issue. Scrim the foam to board joins.