The Brew Cabin

Posted: **Mon Jan 25, 2010 5:00 pm**

Hi all, great site by the way!!!

I'm building a new garage and have a foundation similar to that shown in the detail below.

http://www.pavingexpert.com/images/concrete/xs150gb.gif

Now, the DPC shown obvously prevents damp climbing the walls. The DPM protects the slab from salts etc in the ground. But what about the slab/brick interface? How do you prevent water ingress at this point? Ie from driving rain etc?

As per the detail. My slab is above the GL of the surrounding garden.

Thanks

Posted: **Mon Jan 25, 2010 6:04 pm**

Properly mixed and bedded mortar will do that don't worry about it.

Posted: **Mon Jan 25, 2010 7:00 pm**

as pablo said or your first 2 course from the slab upto damp could be in engineering brick as well if you have teh risk of standing water etc.

we've just done a slab and put a 1:80 fall on the floor slab to keep garage dry and to comply with part b building reg for fire control when no 100mm step into house.

Posted: **Mon Jan 25, 2010 8:03 pm**

^^ use class A's or B 's up to dpc,unless there is standing water against the BWK it wont penetrate
,most slabs i have seen finish flush to the BWk eliminating possible problems with damp

however you must bear in mind that all 100mm walls can get quite damp in driving rain,it will evaporate but the garage wont be as dry as your house
LLL

Posted: **Mon Jan 25, 2010 9:04 pm**

Thanks for the swift replies gents.

It's actually a cavity wall on top of the slab i was thinking of doing. So hopefully damp wont get thru as long as what you say re the interface with the slab at the bottom is fine.

Any point in brickwork DPC's with this arrangement? Or cavity trays etc???

No risk of standing water btw.

Thanks again.

Posted: **Mon Jan 25, 2010 9:38 pm**

you still need the dpc 150mm above finished level
LLL

The Brew Cabin

Waterproofing a new garage...