On cold nights in an unheated attic the exposed metal nail can frost up hence the shiner.
Roof every nail leaks.
What causes exposed roofing nails.
If any of these isn t then the roofing nail can back out possibly causing a hole in the shingle.
Roof nail leaks can happen when roof nails have been loosened slightly from high winds or have simply pulled out over time.
These nails will eventually rust.
If shingles get lifted or torn from high winds the damaged shingle exposes nails holding the shingle below it.
Not every roofing nail finds its mark.
In fact shingle nail pops are one of the most common causes of roof leaks.
If the nail is angled too much the nail head will not be flush with the shingle and may eventually back out.
If one has missed the rafters and protrudes into the attic it is a candidate for water damage.
Another reason for nails backing out or nail pops is the angle that the nail was driven in.
A nail pushing through shingles means a broken shingle and the more nail pops the greater the chances of a leaking roof.
And just one rusted out nail can cause your roof to leak every time it rains.
And exposed misplaced roofing repair nails should be pulled and the holes patched.
Holes in shingles will lead to water damage inside your home.
You might find holes left over from a satellite dish or antenna mounting brackets or just about anything.
This of course can lead to a roof leak.