Heavy Duty Roofing Felt

[jnb]

I need the heaviest duty roofing felt to sort out a leaky shelter roof - caused by the join where a flat, sloping roof joins an apex roof (if that makes sense)
How do I know which is the heaviest grade, or do I just go to the farm shop and act dumb asking for the heaviest duty one? Does it come in gauges /weights or what?

 

[PurBee]

I’d try a builders merchants personally.

You can get tar strips these days, which are very good for fixing that exact issue of a leak join. Its like ‘tar strip flashing’. It’s a pliable thick strip of tar.

Here’s a selection of the stuff i mean:

https://www.roofingsuperstore.co.uk/browse/roofing-accessories/tapes-1/flashing-tape.html