Boots the rubber seals that are around the electric service and plumbing vent pipes air vents and exhaust fan.
Roof lantern leaking.
If a leak is difficult to find enlist a helper and go up on the roof with a garden hose.
For example soak the downhill side of a chimney first then each side then the top on both sides.
A year has now passed and during the very heavy rain at the weekend a few drops came through from where the central ridge joins the supports.
Ridge cap flashing gaskets around pipes.
Isolate areas when you run the hose.
You may be getting a leak from these if they are missing.
The hub is half a moon shape where the end roof rafters fix to.
Start low soaking the area just above where the leak appears in the house.
Had an extension built last year with one of these on the roof.
Nothing serious but obviously a concern.
There are 2 sorts of flat roof those that leak and those that will leak.
Remember the old saying.
If you don t have an attic or just can t find the source of the leak you can check several places for problems with moisture or damage.
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They shouldn t be if the company installed the roof correctly.
Post renaissance roof lanterns were typically made from timber and glass and many structures were prone to leaking.