POOL WALL WATERPROOFING & FAILED PLASTER ADHERENCE

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POOL WALL WATERPROOFING & FAILED PLASTER ADHERENCE

Postby jeffandgop » Thu Jul 03, 2014 6:56 am

The plastering of the pool walls failed to adhere due to the application of a waterproofing solution to the underlying cement wall. The plaster is being complexly removed and my contractor says he'll have to use a different plastering solution.

I had instructed my contractor to notify me when he planned to apply the first & only coat of waterproofing so I could witness. A few weeks after that conversation when I asked when he planned to do so he informed me that it had already been done. I rejoined that he knew I had to witness so I instructed him to do it again & notify me in advance. Same story..a few weeks later he claimed he had already done it. I said until I witnessed it I would not accept that it had been accomplished. So for an alleged third time a waterproofing coat was applied which I did witness.

So is the plastering failure caused by too many waterproofing coats if indeed 3 coats had been applied? Or would even 1 waterproofing coat result in this failure to adhere? Was the plastering composition at fault?

As an aside, I asked my contractor how he planned to waterproof the concrete roof of the pump house and he said using the same waterproofing mixture as was used on the pool walls...I'm concerned that this is not the correct material to be used but should be a product designed for house roofs- but maybe it's all the same...

Any thoughts to my situation?

Thanks in advance!
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Re: POOL WALL WATERPROOFING & FAILED PLASTER ADHERENCE

Postby Mike Judd » Thu Jul 03, 2014 7:33 am

Well I can't claim to be an expert on your problem but usually the render itself has the waterproofing additive added to it if it doesn't already have it in it like the Q-Con render etc; then you put the tiles on with the correct adhesive and grouting. Jazzman would be the one to advise .
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Re: POOL WALL WATERPROOFING & FAILED PLASTER ADHERENCE

Postby Roger Ramjet » Thu Jul 03, 2014 9:43 am

Rendering is not normally done to a swimmming pool, but if the builder had used an agent like Lanko 751 he would/should have had no problems with the render bonding. He also may have used the wrong render material, a common fault.
Just make sure that when the tiles are applied he uses the correct adhesive material, otherwise the same thing will happen. I used a specialist team to tile my empty :D uncompleted pool and they used a special adhesive they brought with them. Compared to the stuff you can get at HomePro and Thai Watsadu it was very expensive.
jeffandgop wrote:I'm concerned that this is not the correct material to be used but should be a product designed for house roofs- but maybe it's all the same...

It is not all the same, you must read the label.
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Re: POOL WALL WATERPROOFING & FAILED PLASTER ADHERENCE

Postby pipoz » Thu Jul 03, 2014 11:40 am

Roger Ramjet wrote:Rendering is not normally done to a swimmming pool, but if the builder had used an agent like Lanko 751 he would/should have had no problems with the render bonding. He also may have used the wrong render material, a common fault.
Just make sure that when the tiles are applied he uses the correct adhesive material, otherwise the same thing will happen. I used a specialist team to tile my empty :D uncompleted pool and they used a special adhesive they brought with them. Compared to the stuff you can get at HomePro and Thai Watsadu it was very expensive.
jeffandgop wrote:I'm concerned that this is not the correct material to be used but should be a product designed for house roofs- but maybe it's all the same...

It is not all the same, you must read the label.


Tend to agree with Roger regarding the use of the Lanko 751 as a bonding agent.

From your photo and his removal of render, it doesn't look like he applied much of a splash-splatter coat first up. Hard to tell from the photo although I could be wrong

Had he applied a decent splash-splatter coat with Lanko 751, before he troweled on the render it should have stuck, like s**t to a blanket

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