My property has a flat roof extension which joins the original house.

In a few spots the render is badly damaged just above the lead flashing.

render lead flashing

It looks like the sealant in the photo was applied, ignoring the damaged render. In recent heavy rain we've noticed water ingress in the room downstairs.

I'm a competent DIYer, but I'm not sure what the correct fix is here. If I repair the render coming down over the top part of the lead, will it expand / contract at a different rate to the lead causing cracking and the same problem reoccurring?

How should the render repair meet the lead?

  • 1
    I would probably use mortar and a add mix to fill the divot the add mix will help with waterproofing and once it is painted it should be as good as the rest.
    – Ed Beal
    Oct 5, 2020 at 18:41
  • In addition to assessing (and repairing) the damaged area, you should inspect the entire flashing run to see if the water may be entering at a different point; it is very common for leaks to run down to areas that are distant from the source... Oct 5, 2020 at 21:36
  • wow, I have the same type of damage in my property
    – quantum231
    Aug 27, 2022 at 15:04


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