external tanking system

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beddy

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Ive got 2 jobs to price in the same street (funnily twin brothers) and they've both had retaining walls built in their sloping back gardens.

The first job was done by an unknown builder. He assured the customer it was lined but there are obvious signs of damp on a few courses. The customer seems to think he just lined it with thin poly.

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The second wall was built my builder and isnt showing any obvious signs of damp apart from last nights rain. I want to tank this wall while ive got the materials for the other, just in case.

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I want to know if there is a system I can use to tank the wall render side instead of digging up the back and lining it.

It will be thin coat acrylic on top.

Thanks
 
You could use vandex as above or do a three coat tanking system with sika 1 ,splatter coat mice one to one, second coat ,2.5 to one, last coat the next day at 3.5 to 1 .its a lot of work though , but something we do all,the time .
 
Rich brown mentioned vandex earlier. I wasn't sure if it would be better for a membrane based system or would that be unnecessary?
 
I called them the other day and found them expensive. The woman priced the 25kg bags at £55 to cover 4m2 a bag. Cementone stuff is about £30 a bag from Jewsons.
 
I would go for a render tanking or damp proofing myself,only worry is salts from the soaked blocks, a membrane system would prevent this..
 
Look at it when we have have less rain ,the decking is wet ,the bottom half of the blocks are dry and with all that earth behind it ,should be wet ,which tells me there could be a membrane there ,IMO mate
 
i would`nt bother with a thin coat render on a garden wall.will go green as hell.just vandexthen two coat render with stacks of waterproof in mate.
 
Theyre both adamant they want coloured render. The first job she wants it green and purple. Would it be worth using silicone instead?
 
1st 2 pics are blocwork retaining 'wet' soil. Last pic is blockwork retaining (prob) hardcore with blue engineering bricks.

I used to use Sika1 system, £50+ a gallon, 3 coat work plus sh1te tech support which blames the sand, ur mixer, contaminated water, wrong cement or nuns for product failure.
Ordinary Sika, or better again Sovereign w/proofer better.
Bib and braces, render plus aqua panel etc but its only a garden wall.
French drain would deffo help on pics 1 and 2 :RpS_thumbup:
 
its under ground level which is a bit of a issue with the colour renders.s&c with a acrylic over the top sounds like a better idea.
 
irish_spread said:
1st 2 pics are blocwork retaining 'wet' soil. Last pic is blockwork retaining (prob) hardcore with blue engineering bricks.

I used to use Sika1 system, £50+ a gallon, 3 coat work plus sh1te tech support which blames the sand, ur mixer, contaminated water, wrong cement or nuns for product failure.
Ordinary Sika, or better again Sovereign w/proofer better.
Bib and braces, render plus aqua panel etc but its only a garden wall.
French drain would deffo help on pics 1 and 2 :RpS_thumbup:
Click to expand...

whats a french drain eddie??
 
Beem speaking to a damp specialist regarding a different problem at my house and he mentioned ka tanking slurry. 2 coats wet on wet. Anyone used it?
 
It's just another cement based waterproof slurry. Not used it myself. If you search cementitious tanking slurry in google there's loads of different products. The one we use is the one in the link I posted before.
 
you need to fit drainage at the bottoms of wall, it still needs somewhere to go. thats what id do then id be more inclined to use something that can breath, than something to try hold back the water.
 
beddy said:
Beem speaking to a damp specialist regarding a different problem at my house and he mentioned ka tanking slurry. 2 coats wet on wet. Anyone used it?
Click to expand...

Wack have just started selling it i think Beddy
 
Yeah they text me an offer on it. I know a place thats cheaper but want to make sure it's the right stuff first
 
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