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PostPosted: Thu Aug 31, 2017 10:38 pm 
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I have a 50 year old sectional garage that leaks water under the base where the sections meet the concrete base. I have recently mortared a fillet on the outside the the garage and then painted it with johnsons water sealer hoping that if I seal the outside then problems solved! Its not very well drained on my neighbours side.See pic I wonder if that's the problem.

Unfortunately this a.m. there was water on the inside fillet. I chipped it away and discovered that in places i could insert a trowel. see pic

I thought i would just shove mortar in this crack and renew the fillet.

What chance of success?


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PostPosted: Fri Sep 01, 2017 12:01 pm 
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How is it getting in?

is it running down the side then working in through the gap?

if so I wonder if you might be better fitting flashling that comes down over the joint (like aluflash, available from toolstation)

Or you could use a liquid roofing seal and paint a stripe across -if its not in a noticeable place

or is it damp working its way across horizontally?

Alternatively, remove the fillet, silcone the gap, redo the mortar fillet with SBR additive to make it waterproof. Then seal the mortar with a liquid dpm afterwards.



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PostPosted: Fri Sep 01, 2017 1:23 pm 
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its definitely coming in from outside. I don't fancy the aluflash if you have to blowtorch it on. I have some liquid roofing seal. I'll try that.
This morning I've dug a small trench to see if it will fill with rainwater and keep water away from where the bottom of the fillet meats the concrete base. I may even dig a bigger sinkhole. I'll then use silcone etc as you suggest.

Thanks for your reply


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PostPosted: Fri Sep 22, 2017 10:30 am 
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I am about to put a fillet inside the garage having fixed the outside. would mortar stick better if the internal floor/wall was dry or wet or should i just paint neat or diluted PVA glue?
Thanks


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PostPosted: Fri Sep 22, 2017 10:49 am 
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If it were me I would chip away the cement fillet then apply a good building sealant where the sides meet the base inside and out then finish with a cement fillet outside.
The type of sealant I mean is like this https://www.toolstation.com/shop/Adhesi ... 0ml/p79104 a few tubes will do the job with a nice thick bead.

Mike

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PostPosted: Fri Sep 22, 2017 1:19 pm 
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Some of the more modern sealants will work in wet conditions: (better than a standard silicone will).

https://www.screwfix.com/p/geocel-the-w ... 90ml/72264

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PostPosted: Fri Sep 22, 2017 7:46 pm 
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Thank you for that link. Even though I think the outside may be fixed we haven't had a downpour yet so I thought I would treat the inside of the garage too. It's a belt and braces approach.

When I put a bead of silicon on the inside would mortar stick better if the internal floor/wall was dry or should I slightly wet it or should i just paint neat or diluted PVA glue?

Thanks


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PostPosted: Fri Sep 22, 2017 8:36 pm 
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Mix SBR into the cement fillet as this will help to waterproof and make the fillet adhere to both surfaces better, it will also harden the cement.

Mike

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PostPosted: Fri Sep 22, 2017 8:48 pm 
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rarmour wrote:

When I put a bead of silicon on the inside would mortar stick better if the internal floor/wall was dry or should I slightly wet it or should i just paint neat or diluted PVA glue?

Thanks


Silicone won't stick very well at all if it's wet. For the mortar approach, it's worthwhile adding SBR as suggested above, it'll definitely adhere better to concrete.

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