August 15, 20206 yr Hi guys have built blockwork on timber frame and architect has said radon/ dpc from sol plate can act as the cavity tray. Now most of it up discovered that the tray will be below ground. Is this a problem and how to rectify? I do have 100mm dpc course 225 above finished ground level so hoping that should be adequate Edited August 15, 20206 yr by Fan1994
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