Any tips for repair/renwal of my garage roof, which is flat felted type. Looks the wood is chipboard, some/all of which will need replaced. Tried a repair before with limited success, but think main problem was poor quality felt (Homebase). Heard of few people recommend felt that has bitumen bottom surface that you need to heat with blowtorch to adhere to roof/underfelt. Felt I used had no such thing and I had to use brush on "stuff" to seal joins.
TIA