The Brew Cabin

Posted: **Mon Jul 11, 2011 1:18 pm**

Hi,

I am starting on my patio and i'm going to lay exterior grade slate to match my internal floor. As I have mostly bi-folding doors across the back I would like to run the external slate at the same height as the internal floor. I've seen this done in lots of magazines but am unsure what needs to be done to make sure damp & building control etc isn't an issue.

I've put a DPM underneath the patio base and was planning on running this up the wall which I will also coat in synthaprufe and adopting the method shown in the attached image:

but I have two issues, the damp and what I put between the drain and the threshold as the door are set back slightly.

someone said to me that this wasn't a suitable solution as you would still get 'splash back' but how else am I meant to run the exterior slate at the same height as the interior floor?

Thanks.

Posted: **Mon Jul 11, 2011 6:01 pm**

hi there welcome to the cabin. I have a few points and queries for you. how old is the building and is there a double dpc. The finish around the door sill is quite poor and unusual in it's siting. Because the door sits on the outer brick it is probably already forming a damp bridge with the internal floor and reveals. Normally that course of brick would finish 150mm below the door which would sit on the internal course. If you don't have a double dpc then I'm not sure there's a foolproof way of doing it without the danger of damp. The brickslots Will in some way to solving the problem but you need to leave access at certain points so you can desilt them now and again. The dpc under the paving is totally useless it would be best to allow any water to pass through and not be trapped. You could perhaps have the paving lower over the main body and ramp it up to the door in the same way modern disability accesses are formed.

Posted: **Mon Jul 11, 2011 7:47 pm**

it is very contempory bolster but a pain in the ass to install
we used the hepworth flush threshold system recently and it was a nightmare to install
much easier to install aco type linear drains which we do for luton council
centaprufe on the walls will help but we normally have to install code4 lead 150mm above any paving that breaches the 150mm rule
on new build a cavity tray is installed at dpc level to alleviate this

flush thresholds are the way forwards but you have to accept that if there is a flood you will get flooded
LLL

Edited By lutonlagerlout on 1310410055

The Brew Cabin

Flush threshold