You may be getting a leak from these if they are missing.
Roof lantern leaking.
Assuming that roof lanterns are fitted on flat roofs.
Nothing serious but obviously a concern.
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Had an extension built last year with one of these on the roof.
Ridge cap flashing gaskets around pipes.
Remember the old saying.
Boots the rubber seals that are around the electric service and plumbing vent pipes air vents and exhaust fan.
Start low soaking the area just above where the leak appears in the house.
For example soak the downhill side of a chimney first then each side then the top on both sides.
In the victorian era metal framed roof lanterns became popular in building design and were used to highlight stairwells.
There are 2 sorts of flat roof those that leak and those that will leak.
They shouldn t be if the company installed the roof correctly.
The hub is half a moon shape where the end roof rafters fix to.
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.
Isolate areas when you run the hose.
These normally have a foam bung stuck to the glass as they have a sticky backing.