Gap between my flat roof extension and neighbour pitched roof .

[zawerjassan]

Hello ,

I just recently had a flst roof 4m rear extension. My neighbour had pitched roof 3m extension last year. They are asking for wearherproofing between the 2 roof. The gap is 150mm and little slant.
The architect proposed a epdm extension with lead flashing but during construction the neighbour complaint on our roof extending and had it removed.
The builder finished the roof as seen in picture. The architect is MIA.
Whats the best way to weatherproof the large gap as the roof is finished but the neighbours are complaining on the wearherproofing still.
Pkease help.

 

[noseall]

Hello ,

I just recently had a flst roof 4m rear extension. My neighbour had pitched roof 3m extension last year. They are asking for wearherproofing between the 2 roof. The gap is 150mm and little slant.
The architect proposed a epdm extension with lead flashing but during construction the neighbour complaint on our roof extending and had it removed.
The builder finished the roof as seen in picture. The architect is MIA.
Whats the best way to weatherproof the large gap as the roof is finished but the neighbours are complaining on the wearherproofing still.
Pkease help.

It doesn't need weather proofing. Both exposed walls down that gap are outside walls. Tell your neighbour to do one.

 

[ChrisJP]

They are both outside walls, but ideally you don't want water going down the gap because, with the lack of both drainage and airflow, it'll remain damp indefinitely, potentially cause damp penetration through the walls.
Still, it does seem unreasonable for your neighbours to complain about the solution you put in place, and insist it was removed, only to then complain about the gap.
Only way forward seems to try to agree with you neighbours what they would want to see covering the gap.

 

[noseall]

They are both outside walls, but ideally you don't want water going down the gap because, with the lack of both drainage and airflow, it'll remain damp indefinitely

And? They are external (cavity) walls.

potentially cause damp penetration through the walls.

Nonsense. There is less chance of penetrative damp through either of those walls because they are largely sheltered.

Only way forward seems to try to agree with you neighbours what they would want to see covering the gap.

All he needs to do is ignore the neighbour.

What we do in a situation like that is pour a nicely trowelled sloped concrete in-fill, once construction is up to DPC, so that what little water that can get down there will drain away.

 

[ChrisJP]

What we do in a situation like that is pour a nicely trowelled sloped concrete in-fill, once construction is up to DPC, so that what little water that can get down there will drain away.

Well good luck with doing that now the walls are full height!