This roof was being replaced because of of hail damage.
Remove nailed metal roofing.
Create patches for holes with fiberglass mesh screening and roofing tar.
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Metal roofing is often made from recyclable materials many of which have an estimated lifespan of 50 years or more.
If you are replacing the nails replace them with new ones as you pull the old ones.
When replacing metal roofing removing the nails is a tedious and necessary procedure.
How to easily remove roof nails from a metal roof.
Replace dissimilar metal nails with similar metal screws.
You can make the job easier on yourself with the proper.