Joined: July 2004
||Posted: 04 April 2017,11:10
|Quote (KAMIKAZEE DIY @ 30 Mar. 2017,20:33)|
|I can't understand why splash-back from rain is a hazard any different to normal rain fall?|
The short answer is that it isn't, but, for some reason lost in the mists of time, it was considered a threat at the time the dpc level was set at (as it was back then) 6" above ground level.
The primary reason, as I've always understood it, for the 150mm 'upstand' is to provide bwk an opportunity to lose moisture through natural evaporation before that moisture has a chance to reach the dpc, which is the final 'barrier' to damp rising through the masonry to levels wehere it might harm the building structure.
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