I have been looking over the requirements set out in our planning consent for a new extension that has to be considered due to flood risk. We are in a flood zone 2.
I am looking particularly at;
- The floor level within the proposed development shall be set no lower than existing levels and flood proofing of the proposed development shall be incorporated where appropriate.
- No soakaways shall be constructed such that they penetrate the water table, and they shall not in any event exceed 3 metres in depth below existing ground level.
1) I have attached an image (groundfloor.jpg) of the cross section for the proposed ground floor. Would this be acceptable for an extension in flood zone 2? What determines whether the building contractor uses Damp proof membrane of polythene at least 1200 gauge or something like mastic ashalt?
2) I have attached another image (Drainage.jpg) of the drainage layout for the property, my house coloured in grey. This image was obtained from old local microfilm library records. There is a surface water drain in my neighbours front drive which we get to via the foul sewer. It shows no manholes are located on my land. What determines whether we continue to use the surface drain running into their property or maybe put in a new soakaway(s) within my property?
3) I have been reading "Cavity insulation should preferably incorporate rigid closed cell materials as these retain integrity andhave low moisture take-up. Other common types, such as mineral fibre batts, are not generally recommended as they can remain wet several months after exposure to flood water which slows down the wall drying process".
So what would be a good cavity wall insulation to use? Something like a closed cell polyurethane cavity wall insulation foam?
Thanks.
I am looking particularly at;
- The floor level within the proposed development shall be set no lower than existing levels and flood proofing of the proposed development shall be incorporated where appropriate.
- No soakaways shall be constructed such that they penetrate the water table, and they shall not in any event exceed 3 metres in depth below existing ground level.
1) I have attached an image (groundfloor.jpg) of the cross section for the proposed ground floor. Would this be acceptable for an extension in flood zone 2? What determines whether the building contractor uses Damp proof membrane of polythene at least 1200 gauge or something like mastic ashalt?
2) I have attached another image (Drainage.jpg) of the drainage layout for the property, my house coloured in grey. This image was obtained from old local microfilm library records. There is a surface water drain in my neighbours front drive which we get to via the foul sewer. It shows no manholes are located on my land. What determines whether we continue to use the surface drain running into their property or maybe put in a new soakaway(s) within my property?
3) I have been reading "Cavity insulation should preferably incorporate rigid closed cell materials as these retain integrity andhave low moisture take-up. Other common types, such as mineral fibre batts, are not generally recommended as they can remain wet several months after exposure to flood water which slows down the wall drying process".
So what would be a good cavity wall insulation to use? Something like a closed cell polyurethane cavity wall insulation foam?
Thanks.