Rendering behind a woodburner

I'm just about to plaster my extension. One of the walls is to have a free-standing woodburning stove next to it. The wall is made of thermalite blocks.

I was planning on Dot and Dabbing the whole wall and then plastering but someone mentioned that this wouldn't last behind the stove because of the temperatures which would crack the plaster and/or muck up the bonding behind the plasterboard.

Is this true? Does anyone have any solutions? I was thinking of using an bonding/browning undercoat instead of DandDing. Some else suggested concrete rendering behing the stove but this would be difficult to blend into to the plastering on the rest of the wall (which is massive)...

Any help would be greatly appreciated.

Do not use plasterboard (even Fireline) or Gypsum base/finish plasters; Gypsum will crack & fail at temperatures much above 50 degrees C.

Follow this link;
//www.diynot.com/forums/viewtopic.php?t=211524

Thanks Richard. I've read through that previous thread and digested all the info (my brain hurts!).

I'm going to go for a 5:1:1.5 Sand, cement, hydrated lime mix. Is it the same basic process as plastering (i.e. a base coat then finishing coat just before the base coat has dried)? Can I float the final coat to get a smooth finish (as with normal plastering) to blend in with the rest of the wall or will there be a definite difference in the 2 different finishes?

You wont be able to trowel to a fine finish, it will be very coarse & you can't blend it in. Unless you can live with a coarse render finish, the only option really is a heat proof finish plaster or lime putty as discussed in the link I posted.

I've been meaning to post this for ages and I've finally got time today.

I ended up finding a product called Vitcas Heat resistant Plaster. It comes in 20kg tubs and works a treat. I rendered the wall first with sand and cement and then plastered this Vitcas stuff on over it to produce a smooth plastered finish that matches the rest of the room.

Its a very sticky product and is a bit like plastering the wall with toothpaste but the finish is great!

Couldn't be happier - yeah I've got a small crack where the Vitcas meats the multi-finish but I think I forgot to use mesh tape on the join so that's my fault, but easily fixable.

Hope this helps in the future. Happy plastering

PhiLyn said:

I ended up finding a product called Vitcas Heat resistant Plaster. It comes in 20kg tubs and works a treat. I rendered the wall first with sand and cement and then plastered this Vitcas stuff on over it to produce a smooth plastered finish that matches the rest of the room. Its a very sticky product and is a bit like plastering the wall with toothpaste but the finish is great!

Click to expand...

Following the interlinks back from the one I posted would have brought you to my recommendation to use the same stuff; it does behave differently to Multi & can be a little more difficult to use. You should really have added lime with the render mix, apply as scratch & float coats, making the latter a slightly weaker mix; much better at tolerating the heat.

Stoves & plastering around them comes up so often now I have since put together a standard post with all the links in one place rather than having to keep going back through previous threads with interlinks.

Richard C said:

Stoves & plastering around them comes up so often now I have since put together a standard post with all the links in one place rather than having to keep going back through previous threads with interlinks.

Click to expand...

Just for the record, I've found your posts on this subject very helpful, so a big Thank You to you!

Richard C said:

Stoves & plastering around them comes up so often now I have since put together a standard post with all the links in one place rather than having to keep going back through previous threads with interlinks.

Click to expand...

Thanks for this Richard. Do you have this standard post anywhere on the forum? Just getting the HETAS installers in soon and would like to get this right first time. Thanks in advance.

Ianlinux said:

Do you have this standard post anywhere on the forum? Just getting the HETAS installers in soon and would like to get this right first time. Thanks in advance.

Click to expand...

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

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 you 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.woodburnerwarehouse.co.uk/building_regualtions_for_stoves.phtml
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
//www.diynot.com/forums/viewtopic.php?p=1855590#1855590

& some more sobering reading 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
http://www.dailymail.co.uk/news/art...ouple-dead-arms-sofa-overcome-coal-fumes.html

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!

Lovely Richard thank you! I have no intention of clambering up and will leave it to HETAS engineers. 10 years ago mind I would have done it! But with arthritis coming in and a useless lower back, some young guns can do it.

Really appreciate the links and will have a read tonight.