Winston Posted September 12, 2020 Share Posted September 12, 2020 We are building a single storey rear extension wall next to our neighbour’s single storey rear extension wall. The neighbour has a pre-finished aluminium capping to their parapet. We intend to form a pitched roof abutting right up to theirs forming a weathering detail - but this is proving decidedly difficult! Our roof pitch will not match theirs. Their roof pitch I estimate is 12 degrees and ours, 15 degrees. Therefore, the lowest part of our roof at wall plate level does not enable a 150mm cover flashing to be formed between the neighbours extension wall and our roof (we can only get say 60-70mm upstand). At the highest level at rear original house external wall abutment, there is healthy say 300-400mm difference in levels down to their parapet which would enable a detail to be created (subject to their agreement) dressing on to their parapet. But the ‘cross over’ space between the two creates a troublesome area difficult to weather properly. It is not really an option to take off the neighbour’s aluminium capping. I understand an option is to form my own parapet which would resolve the issue, but I may lose internal floor space. Any ideas? Link to comment Share on other sites More sharing options...
Declan52 Posted September 12, 2020 Share Posted September 12, 2020 A pic would help. Link to comment Share on other sites More sharing options...
Russell griffiths Posted September 12, 2020 Share Posted September 12, 2020 are You not having a wall at that end at all, just tying into theirs ?? Link to comment Share on other sites More sharing options...
scottishjohn Posted September 18, 2020 Share Posted September 18, 2020 If i understand you you are making a lean too extension which you intend to attach to the neighbours wall which is tight up to your boundary . have you asked them if they will let you and give permission for maintainence ? I any water leaks from your roof will go right through their wall and vice versa It would a hard no from me and i would telling you to build your own wall and keep your rain water to your self Link to comment Share on other sites More sharing options...
Russell griffiths Posted September 20, 2020 Share Posted September 20, 2020 Another disappearing poster. Link to comment Share on other sites More sharing options...
Winston Posted September 29, 2020 Author Share Posted September 29, 2020 I hope these photos help. Link to comment Share on other sites More sharing options...
Winston Posted September 29, 2020 Author Share Posted September 29, 2020 We are able to build a wall inside and do a taller parapet detail. Not sure how to cap it or slope it? We asked if he consented to putting lead across the top but he did not reply. Link to comment Share on other sites More sharing options...
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