MegaSack DRAW - This year's winner is user - rgwb
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Our bungalow had concrete slabs laid up to and over the dpc which I've removed. We now have the dpc 6" above ground level (clay). Our plan is to replace the slabs with loose stone (cotswold buff) and my Q is: Can I lay the loose stone to within 3" of the dpc and rely on its 'breathability' or does the block below the dpc need a good 6" of air movement around it (if so I'd have to put in some edging)?
Also would there be any benefit to digging out further clay against the property (a spades width) and filling the trench with gravel to aid drainage prior to the loose stone going down.
Many thanks.
You may find that heavy rain will splash up those three inches and soak the wall above the DPC.
You may find that heavy rain will splash up those three inches and soak the wall above the DPC.
Is this any different to rain fall hitting the wall directly?
bum
The dpc is dpc. If its been fitted correctly and is of sound construction it will do it's job which is to prevent damp from rising from the course below. The whole 150 mm thing boils down to "good building practice". Breathability isn't really an issue. As stated above driving rain has the ability to wet the brickwork above dpc but the density of the brick usually prevents this along with the cavity if present. Are there any signs of damp present at the moment?
our rendered solid brick extention has not got a DPC injected or otherwise and the floor is slightly lower than the outside and we have no problems with penetrating or 'rising' damp. Go Figure.
EDIT: I should add, there is a french drain around the perimeter
Are there any signs of damp present at the moment
No not really, the slabs were probably laid in approx 60/70s and apart from a minimal amount of discolouration to the external blockwork low down it all.seems fine.
wrightyson: if I ever get to meet you the drinks are on me, I appreciate the advice you've given on my threads.
One good thing in this was that the slabs were laid properly and in the proper place. Otherwise There would be problem for the external block work.
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