It is normal for them not to be abutted to the house because rainwater will splash up from them and wet the bricks above the damp course. This can cause problems - as you can imagine.
It really depends on how far up your DPC is from your slab level.
How far are we talking?
2 bricks thick//150mm is, AFAIK, fine. It is when it is less than this when the problem can occur.
Have a read of the article below. That is a really good site for info.
Come back with any further questions.
B
http://www.pavingexpert.com/dpc01.htm
It is normal for them not to be abutted to the house because rainwater will splash up from them and wet the bricks above the damp course. This can cause problems - as you can imagine.
It really depends on how far up your DPC is from your slab level.
How far are we talking?
I think there is a fair bit of needless worry about the 150mm, yes in an ideal world but as mentioned if the wall is a cavity then the outer skin is separated anyway and quite possible saturated anyway during spells of long rainfall. Any new building has its doors and often the wall immediately each side with a level threshold so no 150mm, there is no problems per se with this.
I think there is a fair bit of needless worry about the 150mm, yes in an ideal world but as mentioned if the wall is a cavity then the outer skin is separated anyway and quite possible saturated anyway during spells of long rainfall. Any new building has its doors and often the wall immediately each side with a level threshold so no 150mm, there is no problems per se with this.
I agree. I don't know how much of a problem this would actually be - especially with a cavity wall set-up.
The OP asked whether the gap was necessary so I gave him the 'textbook answer'.
I think he is now in the best position to make an informed decision in light of all that has been said.
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