heat resistant and waterproof an interior wall

[frognsausage]

Hi

We're preparing a wall for a wood burning stove.

We've been told that plaster is combustable so we have to take the wall back to brick.

We've found the lower bricks are damp (where the plaster seemed to have been thicker and somehow harder). There's no obvious source of damp. It *should* be an internal wall/wall to next door but it's an old house so nothing is simple!

We're thinking of using high alumina cement to re-"plaster" the wall. Can we add any waterproofer to it? Is there a non-flammable waterproofer suitable for use next to a stove?

Thank in advance

 

[TheDec]

Try asking on the Plastering & Rendering sub forum.

Dec

 

[frognsausage]

oops! That's where I thought I was.

Thanks Dec.

 

[Richard C]

We've been told that plaster is combustable so we have to take the wall back to brick.

Whoever told you that are wrong; gypsum plaster/plasterboard is not combustible but it’s not suitable for applications where the temperature will exceed 49 degrees, it will fail. I would not advise you render with high alumina cement, use a sand/cement/lime render mix in two coats (5:1:1/6:1:1) or a heatproof render (Vitcas) plaster must also be heatproof (Vitcas again). But you’d be wasting your time over a damp wall, you must locate the source & cure that first or whatever concoction you put over it will fail.

As this comes up so often, I’ve put together a generic post; read the links but not all may apply to you.

------------------------------000000000000000000----------------------

You can DIY a stove install but you need to understand the Building Regs (which changed in October 2010), submit a Building Notice & pay a fee. Your LABC will inspect &, assuming everything is OK, issue a compliance certificate; the BI may want to witness smoke & spillage tests. No compliance certificate may lead to difficulties when you come to sell your property; if cannot produce a compliance certificate in the event of a problem, your insurance company may invalidate your policy & reject any claim.

Lots of archive threads on this, & other things you have to watch out for, here a few links for you to read:
http://www.stovesonline.co.uk/stove_building_regulations.html
http://www.planningportal.gov.uk/uploads/br/BR_PDF_ADJ_2010.pdf
http://www.hetas.co.uk/public/certificates.html
http://www.solidfuel.co.uk/pdfs/buidling_regs_consumer leaflet.pdf
//www.diynot.com/forums/viewtopic.php?t=183614
//www.diynot.com/forums/viewtopic.php?t=211524
//www.diynot.com/forums/viewtopic.php?t=242738
//www.diynot.com/forums/viewtopic.php?t=224751

& some more sobering just in case you think it’s all a load of old tosh:
http://www.solidfuel.co.uk/main_pages/news.htm
http://www.dailymail.co.uk/news/art...wood-burning-stove-leaks-carbon-monoxide.html
http://www.eveningnews24.co.uk/news/warning_over_heaters_after_norfolk_couple_s_death_1_811099

Also get at least 3 quotes from local independent HETAS installers:
http://www.hetas.co.uk/nearest_member

You might be pleasantly surprised & you should ask yourself if you really want all the hassle & risk getting it wrong; climbing onto the roof with an 8M stainless steel snake on your back is not for the feint hearted!

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Read more: //www.diynot.com/forums/viewtopic.php?t=267604&highlight=#ixzz1I6jlicut

 

[frognsausage]

Thanks for the replies.

We're not DIYing the whole installation - we're just sorting the wall where the hearth is going!

Any particular problem with using HAC?

 

[Richard C]

High Alumina Cement can resist high temperature & its main use seems to be structural & refractory concrete used in ovens & kilns but it seems buildings made using it also collapsed during the 1970’s.

I’ve never used it or come across it before so can offer no advice of how it behaves when used as a render mix. But why would you want to use it instead of tried & tested materials such as Portland cement in a sand/cement/lime render mix!

 

[frognsausage]

Hi Richard,

I've replied to what I can only describe as your "strop" on the other forum but I do sincerely apologise for the upset caused.

I appreciate your answer and effort very much but I'm very aware this is the wrong forum.

I have now asked the mods to merge the two.

It was an honest mistake Richard - not a reflection on your answers.