Besides being tripping hazards they can work through and damage the new shingles.
Removing old roof slates.
Clean the roof with a push broom and remove or pound in any remaining fasteners.
Slate is a sedimentary rock with miniscule layers that easily cleave.
Roofing tar also called mastic or cement plays an important role in roofing repair and installation.
Removing tar from a roof.
Work from the top bottom and sides to save back muscles.
The good news about changing your slate roof is that you get a new roof which can mean a giving your house a different look or repairing leaks.
Excessive and improper use of the sticky stuff however can leave.
Once turned into roofing material slate absorbs water and can naturally de laminate during the freeze and thaw cycles of winter.
The bad news is that removing your slate roof will cost more than removing most other types of roofing.
Exactly how much it will cost will vary from region to region and from season to season.