Best way to remove glued down felt?

[ellal]

I've got to remove felt from a roof which has been on there for about 15 years.
In places it had cracked and a simple scraper lifts it.
But in other areas it's stuck fast and even a heavy duty floor scraper won't shift it.
Tried a heat gun, but again only a few bits came off.

I want to get it off so that I can attempt to unscrew the OSB that has rotted at the edges.
I had thought of trying to just rip the board off with felt attached, but don't want to risk damaging the main roof structure.

Any help appreciated.

 

[datarebal]

garden spade

 

[alan333]

Garden spade as datarebal says. Do it when cold, the bitumen is more brittle and will unstick from the wood much easier. Try to get the flat of the spade under the felt, rather than just using an edge, and push down on the handle such that the toe of the spade lifts a large area of the felt at one time.

 

[catlad]

And If you are still struggling and you have access underneath then a pry bar could help lift the boards if you are completely replacing them.