Advice on fireproof tile adhesive

[doug boardley]

don't forget to give it a coat of primer G first LG

 

[log_gatherer]

Is that just PVA or something special?

Neil

 

[doug boardley]

it's the proper stuff to prime your plaster with Neil, you should be able to get it where you get your keraquick from, don't use PVA:yikes:

 

[Ajax123]

If the temperature at the back of your stove is going to be high enough to require a fire proof adhesive I am afraid your substrate is not suitable. Carlite Browning and multifinish are both made from Gypsum. This is a crystaline substance which uses water as part of the crystaline matrix. If this is subjected to sustained elevated temperatures the "water of crystalization" is driven off from the gypsum molecule and it begins to "dehydrate". This will initially manifest itself as localised cracking or crazing which will potentially cause your tiles to crack. Ultimately it will fall apart and your tiles will simply fall off.

When dealing with Gypsum based materials e.g. screeds with under floor heating the temperature should be maintained below 55 degrees Centigrade.

I suspect however that your wall is unlikley to get that hot and a fireproof adhesive is not really necessary.

 

[log_gatherer]

Well...

The stove has been on for about 6 hours now - the plaster behind it is not much more than comfortably warm. I can easily put my hand onto it and it just feels cosy. I guess around 28 - 32C.

The warmest part is around the place where the chimney pipe enters the wall, about 1200mm above the stove itself. Again, I can hold my hand on the wall and it's not uncomfortably hot. I'm going to put on a circular enameled steel 'rosette' to protect the plaster from over-heating.

Any particular brand of Primer G to get?

Thanks,

Neil

 

[DHTiling]

Mapei primer G...

 

[Ajax123]

Well...

The stove has been on for about 6 hours now - the plaster behind it is not much more than comfortably warm. I can easily put my hand onto it and it just feels cosy. I guess around 28 - 32C.

The warmest part is around the place where the chimney pipe enters the wall, about 1200mm above the stove itself. Again, I can hold my hand on the wall and it's not uncomfortably hot. I'm going to put on a circular enameled steel 'rosette' to protect the plaster from over-heating.

Any particular brand of Primer G to get?

Thanks,

Neil

Thought it would not get that warm. there are loads of primers you can use for this type of application - I personally would recomend an epoxy if you are using a cement based adhesive. This is becasue they are not particularly affected by the warmth and eliminate the risk of chemical interaction between the gypsum in the plaster and the cement in the adhesive. Acrylics do not seem as effective at this when there is heat involved.

 

[log_gatherer]

I'll be out tomorrow at Tile Giant for some Primer G!

Thanks guys -

Neil

 

[White Room]

it's the proper stuff to prime your plaster with Neil, you should be able to get it where you get your keraquick from, don't use PVA:yikes:

Sorry to hijack for a second, Doing a wet room and the builder made the falls to steep into the drain and now has to build up and suggested putting PVA down before he puts extra sand/cement to build up the floor:yikes::yikes::yikes:
Told him to use sbr, he's never heard of it

 

[log_gatherer]

Thanks for the advice guys - the tiles and grout are up, primer G holding it all together!

Been running the stove fairly intensively for a week, no probs, and the tiles look great!

I'll post some pics when I can find out how...

:hurray::hurray::hurray::hurray::hurray::hurray::hurray::hurray::hurray::hurray::hurray: