Leadwork & flashing · A focused guide
What should a repair at a flat roof wall upstand include?
Published by Big Ben Roofing Ltd
A wall-upstand repair needs the connection between the roof waterproofing, raised junction and wall detail considered as a whole. Replacing only the visible flashing may leave another defective component untouched. Describe where the flat roof meets the wall and any previous patches. Ask which layers are retained, what must be exposed and how the proposed repair will connect to sound existing material before accepting a scope described simply as new flashing.
Show the wall and roof relationship
Identify whether the affected wall adjoins the main house, a side boundary or another roof level. Mention doors, windows or other features close to the junction without trying to measure it from the roof. Existing construction drawings can help, although they may not show later changes. Ask the assessor to distinguish the visible appearance from the concealed arrangement that still needs checking.
Coordinate materials and responsibilities
The flashing and flat-roof work should be specified so their connection is clear. Ask who handles the waterproofing layer, wall preparation and any internal making good. If the junction cannot be repaired independently of the wider covering, request the reason and resulting work boundary. Additional opening-up or masonry defects should be documented and agreed rather than hidden inside an undefined contingency.
Useful details to record
- Identify which wall junction and flat-roof section need assessment.
- Mention previous surface patches and when the current problem began.
- Share available drawings without assuming they match every concealed layer.
- Ask who handles waterproofing, flashing and disturbed wall finishes.
Use information already available from indoors or ground level. Do not climb onto the roof or disturb materials to complete this checklist.
Can a new metal cover be fitted over any existing upstand?
Suitability depends on the actual roof and wall arrangement. Ask how the retained waterproofing and supporting detail have been assessed. A visible cover should not substitute for explaining the condition and connection of the components beneath it.
Background reading
- Lead Sheet Training Academy: flashing and junction details
- Lead Sheet Training Academy: rolled lead sheet technical manual
General guidance helps frame the questions. The cause, suitable materials and scope depend on inspection of the particular roof.
Related questions
What if a flashing leak returns after several sealant patches?
Use previous patch history to frame a focused assessment of the material and junction rather than automatically repeating the same surface treatment.
Why is roof flashing pulling away from the wall?
Prepare an enquiry about an open flashing-to-wall junction and ask about the material, retention and condition of adjoining masonry.
Discuss what you have noticed
Include your postcode, the affected roof section and when the concern appears. The team will review the enquiry and confirm the next step, scope and availability.
Request a roofing assessment