sbr on ply

[Matthew77]

Hi all.

I've got a job coming up tiling a small domestic shower/wet room, just wanted some advice for it.
When i went to price up the job one of the walls is made up of ply so i asked the builder if he wanted the wall tanked out & he said he'll use sbr on it & that should be fine, now i'm guessing that sbr isn't the best option for this & using a tanking product like the bal wp1 system would be the thing to do,but my question is as he doesn't seem keen to use a proper tanking system would sbr be alright?

also why is it that everytime i recommend using cement based boards or a tanking sysems people seem so against it, I doubt there is that much of a difference in the price from a peice of ply to a water proof backer board?:mad2:

Thanks in advance

Matthew

 

[Gazzer]

Because the client/builder etc always knows better :mad2:

 

[robbo]

A waterbased polymer with a wide variety of uses in the construction industry, particularly as an admixture and bonding agent for cement and concrete applications. Once cured, the polymer is water and frost resistant. BAL BOND SBR can be used as a slurry coat when mixed with hydraulic cement or gypsum plaster, as a multi-purpose admixture for cement:sand mortars, concrete and gypsum plaster; as a brush applied primer, sealer or dustproofer.

Suitable for use on cement:sand screeds, toppings or renderings, plastering, waterproofing, bonding, concrete repair, priming and sealing.




Tanking around the shower with Bal WP1 would give peace of mind.

 

[sWe]

BAL SBR Bond states it's water resistant, but that is not the same as being waterproof.
This has been discussed many times lately. When something is "resistant" to water, it means the product won't deterioirate under the influence of it. It does not mean, however, that it won't let water through at all.

Also why is it that everytime i recommend using cement based boards or a tanking sysems people seem so against it, I doubt there is that much of a difference in the price from a peice of ply to a water proof backer board?

People who feel they're putting out with alot of cash are often short sighted. Using backerboard, aquapanel, or something similar, IS more expensive than using ply, but having to redo everything because of water damage is far far more expensive than buying proper materials to begin with.

Over here it's verboten to use live materials in bathrooms. Wood based materials are live, even if they're impregnated. We're not allowed to use plasterboards either, unless we waterproof it with water and steamproof membranes, such as Shlüter Kerdi, and still that's only a temporary exception. After the 1st of July, we HAVE to use stuff like aquapanel.

Anyways. Enough ranting from me.

If they do intend to "waterproof" with sbr, atleast get a disclaimer against water related damage.

 

[Matthew77]

I'm hoping they will do the same here as really it should be the same and in the building regulations.

 

[sWe]

Northern Bird posted this in a thread about two weeks ago. It should help you when you've got stubborn/stupid customers to deal with.

"BS5385-1:1995 Wall and floor tiling part 1 code of practise for the design installation of internal ceramic and natural stone wall tiling and mosaics in normal conditions (Section 3.1.2.6) states that sheets such as platerboard, plywood and chipboard that are not dimensionally stable with changing humidity should not be used in wet or damp conditions.

Section 3.2.4.3 states that plasterboard should not become damp wither during storage or after installation and BS 5385-4: 1992 Wall and floor tiling part 4: Code of practice for tiling in mosaics in specific conditions (Section 6.4) adds that water resistant materials should be used throughout and be capable of withstanding continous contact with water without deterioration.

So essentially, British Standards explicitly state plasterboard and plywood should not be used in in areas where they might be subjected to wet or damp conditions.

I imagine it pretty annoying that you can't download the british standards for free. Ok that you have to pay for a hard copy, but come on, downloading something tax money paid for should be free (as in beer). I've got digital copies of the Swedish Standards downloaded, and they were free.

 

[Matthew77]

Why doesn't it suprise me that you can't download them for free in this country,they should be available to anyone that is doing any kind of building work done to their house or anyone thats interested.

With this information available to the customer as well as the tradesmen at least the customer has an idea of how thing should be done properly as opposed to taking the tradesmans word...

 

[DHTiling]

I totaly agree with you sWe on that one...all standards should be free for viewing or purchase...