Concrete Path level with "dampcourse"

9 Dec 2009
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United Kingdom
Hi again
Son is moving in to 1950's ex-Council house, on gable-end there is a lean-to 3 by 4 Mtrs, need to demolish this and re-build a 3 by 6 Mtr extension, snag is the finish floor in the main house and carried in to the lean-to is only around 50mm (2ins) above the concrete path around the house, since I need around 150mm of "Space" between the damp course and path it would either mean that I have to lower the path or have a step up in to the new extension, neither an option, I doubt if there is a "good" damp course around the property due to age, have not had contracts signed yet to have a closer look, this is a permitted development, no plans required, hope you can help and advice.
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There is no problem with a high external ground level, you just design a suitable DPC detail to compensate on the new extension

Whether the extension will be permitted development, will depend on other factors - check the planning portal for details
Thanks for your reply, if I install the new build damp course 75mm under the finish screed it will be under the external path, I have had permission for permitted development from planning.
You would not install a normal horizontal DPC.

You would have a vertical DPC on the inside of the wall below ground, then a horizontal DPC, and then a cavity tray above this
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thanks again, sorry, but can you explain the position in the footing for installing cavity trays? maybe a link to some web page
DPC in blue

Thanks again for your help, obviously the damp course and trays will have to be installed to all parts of the footing, again much obliged for your advice

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