Flat roofs are common on extensions, garages and converted buildings.
Renewing a waterproof membrane will not normally create Party Wall requirements, but more substantial alterations to the roof structure can.
Straightforward roof renewal
Replacing an existing roof covering on your own property is generally a maintenance matter.
The position changes where the works involve structural alterations to shared or boundary walls.
Raising the roof level
Modern warm-roof systems can increase the overall thickness of a roof.
This may require alterations to:
- parapet walls;
- flashings;
- copings;
- roof abutments; or
- other boundary details.
Where the parapet is a party wall, Party Wall advice may be required.
New structural beams
Roof alterations may involve replacing joists or installing steel beams.
Where structural members are cut into a party wall, Section 2 may apply.
Our Section 2 Party Wall Act guide explains these rights.
Flashing into adjoining walls
If your flat roof meets a neighbouring wall, weatherproofing may require flashing or another abutment detail.
Simple Survey already provides dedicated guidance on Party Wall waterproofing and flashing.
Access
Some roof works may be difficult to carry out without access from neighbouring land.
Party Wall access rights exist only in particular circumstances and should not be assumed.
Our Section 8 Access guide explains the position.
Simple Survey can help
If your flat-roof project involves parapets, shared walls or structural changes, send us the drawings through our Party Wall Surveyor page.