Browse Forums Paving & Concreting 1 Oct 20, 2011 9:44 am I need to have a concrete slap for a verandah area, which will be poured against the house. Due to reasons I don't need to go into, it may be that the concrete will need to be poured to a level above the damp course of the house. My concreter assures me that this can be done, and he simply needs to lay some damp course between the new house and the new slab (presumably vertically, rather than horizontally as is the case between house foundations and brick walls. Does this sound like a reasonable suggestion? Re: concrete for verandah against house - above damp course 2Oct 20, 2011 9:53 am I got a feeling he is just going to put foam expansion in between the two slabs. His thinking that this may give water somewhere to go. Either way like you i wouldn't be confident. However, What you need to determine is exactly how much higher that the damp course is he going. Secondly you want to ensure you have sufficient fall on your new slab so that water does not fall back into the house. Re: concrete for verandah against house - above damp course 3Oct 20, 2011 10:41 am He specifically said he would use a damp course, not foam between an expansion gap. The concrete may be a few centimeters above the house damp course. he did also acknowledge the need for sloping away from the house (which of course doesn't directly address the rising damp) Re: concrete for verandah against house - above damp course 4Oct 20, 2011 12:07 pm Just want to point out, that the damp course is not necessarily for rising damp, with today houses taht are built on slabs. I am assuming yours is a house on a slab. Its to allow water that has fallen behind the brick work to escape out. Have look at your house plans and you will probably find that brick articulation joint has been missed. Maximum allowable spacing is 6M or 5.5M for a wall with window… 17 20579 6 4346 DIY, Home Maintenance & Repair I'm in WA and our sandy soils make drainage a bit easier but this is what I'd be doing. Dig down to your footings and let the wall dry out. Clean it all well by brushing… 1 5193 |