We have a small garden shed that holds various bits and pieces. When I went in there to get the lawn mower out, I noticed that the roofing felt had split at the apex and I could see light coming through. I have been down to my local merchants expecting to be able to buy a narrow roll of felt to tack on over the split roof, but I was only offered some rubberized paint on, or another that was like a thick mastic. The alternative would be to buy a wide roll of felt (about 3 foot wide) and cut it to size and tack it on.
What would be the best to use of the three.
Dave