Hi
I hope this is the right place for my question and hope you can advise me. A new extension was added to my 100 year old house. The old back door now steps into the new utility room but the 3 tiles cracked on the threshold. I lifited them and the chipboard flooring on polystyrene insulation has warped and slightly damp. The old threshold (concrete) is damp and my builder reckons this might be caused by possibly no dpc under the threshold? He reckons I could paint AquaSeal liquid membrane on the threshold and cement over it but I'm worried that if the liquid membrane works, it might spread the damp further out of sight! I also sort of think that he should be solving the problem but I would like to be able to say something sensible, like the problem is xyz or puttin g aqauseal will not solve it----but I haven't got the knowledge???
I've attached a picture of the extension groundworks just in case something stands out to a professional. If anyone could spare a comment, I would appreciate it - many thanks.
I hope this is the right place for my question and hope you can advise me. A new extension was added to my 100 year old house. The old back door now steps into the new utility room but the 3 tiles cracked on the threshold. I lifited them and the chipboard flooring on polystyrene insulation has warped and slightly damp. The old threshold (concrete) is damp and my builder reckons this might be caused by possibly no dpc under the threshold? He reckons I could paint AquaSeal liquid membrane on the threshold and cement over it but I'm worried that if the liquid membrane works, it might spread the damp further out of sight! I also sort of think that he should be solving the problem but I would like to be able to say something sensible, like the problem is xyz or puttin g aqauseal will not solve it----but I haven't got the knowledge???
I've attached a picture of the extension groundworks just in case something stands out to a professional. If anyone could spare a comment, I would appreciate it - many thanks.