Water proofing - timber frame and concrete

**Probla** · 30th August 2022, 01:15 PM

Hello

I have a swimming pool that is built very close to my house (approx. 450mm). The house is double storey, brick veneer (rendered over) on the lower storey and foam/render on the upper storey.

The walls themselves are constructed using standard MGP10.

I am nervous about water splash from the pool, seeping through the render and rotting the timber wall frames and now is my chance to do something preventative about it.

I'm also nervous water pooling on the slab rebate in the 40mm cavity between wall frame and brick work, even though I will have DPC + weepholes present.

I've researched bitumen waterproofing membranes (like this one Gripset Betta Bitumen Rubber Waterproofing Membrane 4L | Mitre 10) which seem fairly straight forward to apply and can be used on both concrete and timber surfaces. They also appear flexible so shouldn't crack under normal house movement.

Plan is to prep accordingly, apply a primer then 2-3 coats of this onto the timber frame and 40mm concrete cavity.

Is this the product you would recommend using? Will it leak or crack over time?

Or am I on the complete wrong path here.

**havabeer69** · 30th August 2022, 10:45 PM

any pics of the area?

why is this now your chance to do something about it? do you have the walls off or something? most of those membranes are meant to go on the outside of where ever you don't want the water to be.

**Probla** · 31st August 2022, 08:39 AM

Originally Posted by havabeer69

any pics of the area?

why is this now your chance to do something about it? do you have the walls off or something? most of those membranes are meant to go on the outside of where ever you don't want the water to be.

Thanks for the response. I’m at framing stage and I'm just concerned and have an opportunity to do something about it now. Not sure what people normally do when pools are built so close to the home. I know that the render can be sealed to improve water resistance, which I will do, but aside from that there’s not much I can do externally to bolster water resistance?

Thinking more about it since originally posting, would it be a good idea to install some cement sheet across the frame work then apply the bitumen over that? This would create a waterproof barrier rather than relying on sisalation only.

I've attached a photo to the original post.

**Beardy** · 31st August 2022, 11:11 AM

You shouldn’t need to do anything if you have followed good building practice. Water should not be able to enter your cavity from your pool area, your external brickwork is designed to be wet and your cavity flashings direct that moisture out at GL.

**rwbuild** · 31st August 2022, 12:19 PM

You don't have to do anything as Beardy said, just stand back and let the builders, certifiers do their job

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