What plasterboard on a chimney breast?

carryoncamping · 9 Sep 2008

I'm about to start Dot & dabbing my living room, do you need fireline (pink) plasterboard for a chimney breast, or is std 12.5mm fine?

I plan to have a log burner in the fireplace but I doubt the plastrered walls would get that warm.

Thanks

noseall · 9 Sep 2008

regular plasterboard will be fine.

the properties that make fireline plasterboard a fire resistant material are put there to help contain and tolerate direct contact with fire and are less about tolerating changes of temperature.

i would be inclined to face the chimney breast with a single piece of plasterboard, if size parameters allow and avoid joints.

carryoncamping · 9 Sep 2008

noseall said:
regular plasterboard will be fine.

i would be inclined to face the chimney breast with a single piece of plasterboard, if size parameters allow and avoid joints.

Thanks for your reply, Nosall. My new fireplace now has corner facebricks which are 1.5" proud of the wall. I plan to plasterboard in and out of the bricks (see photos)

Ignore the wood, this was to prop up the concrete lintel whilst I rebuilt the corner bricks.

A picture with plasterboard cut in and out of brickwork. NOT the final cut!

Artistic impression of how the fireplace may look! Is plastering in and out of the bricks a plasterers nightmare?. The Oak 'lintel' is 3" deep and is to be screwed to the wall to give the impression of being a load bearing lintel.

noseall · 9 Sep 2008

plastering between the 'quoins' will be tricky and will leave the bricks a little stained.

make sure you give 'em a scrub once the plaster has gone off.

roughcaster · 9 Sep 2008

It will be tricky as Noseall says. Get yourself a nice sized filling knife (flexible scraper) and use that to get in and out of the quoins. Also, to stop it cracking around the quoins, put some self adhesive fibre tape round the plasterboard following the "in and out" shape of the brickwork, before you start plastering. Take your time with it, but it's these fiddly little bits of detail that will really make your job look good.

Roughcaster.

carryoncamping · 9 Sep 2008

roughcaster said:
It will be tricky as Noseall says. Get yourself a nice sized filling knife (flexible scraper) and use that to get in and out of the quoins. Also, to stop it cracking around the quoins, put some self adhesive fibre tape round the plasterboard following the "in and out" shape of the brickwork, before you start plastering. Take your time with it, but it's these fiddly little bits of detail that will really make your job look good.

Roughcaster.

Thanks for the replies.

Just one last question, should I PVA the walls which used to have 70 year old plaster on them prior to dot & dabbing ? If so, what ratio Water

VA, do I let it dry or just tacky?

Carryon

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What plasterboard on a chimney breast?

carryoncamping

noseall

carryoncamping

noseall

roughcaster

carryoncamping

DIYnot Local

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