The best advice I can give you is to make sure you buy the best roofing felt you can afford, the thicker it is, the longer it will last. You will find that the old felt is nailed onto the wood underneath so you will need to take all the wooden battens off first, then prise off the felting nails (you will need to buy new ones). It's not an easy job to cut the felt and get it onto the top of the shed apex so more than one pair of hands is needed. Overlap each sheet slightly before nailing it down then recover with one of the wooden battens. Hopefully instructions should come with the roofing felt. If not, do come back to us.
I’m currently in the same position with my shed. Roofing felt is troublesome, tricky to install properly and pretty fragile in the long term. The sarking (rough sawn treated straps) nailed long ways down the roof are a constant leaking hazard. The wood eventually rots and if the nails used are not galvanised they rust and leaks abound.
Im currently looking at corrugated bitumen sheet as an alternative. Onduline and Carolin are 2 brand names. It looks easier to diy than felt and although more expensive, it’s more robust and lasts much longer. Folk with stables and commercial outbuildings use it a lot so that’s a good reference in itself.
Sheets from wickes are 950mm x 2m x 3mm thick and cost £25 each although I’ve seen it on line for as little as £17 a sheet. YouTube has a couple of ok installation videos.
Rubber sheet similar to pond liner is also an option. It’s called EPDM and is availlable in kit form online. This is probably the simplest but in my opinion least attractive option.
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The best advice I can give you is to make sure you buy the best roofing felt you can afford, the thicker it is, the longer it will last. You will find that the old felt is nailed onto the wood underneath so you will need to take all the wooden battens off first, then prise off the felting nails (you will need to buy new ones). It's not an easy job to cut the felt and get it onto the top of the shed apex so more than one pair of hands is needed. Overlap each sheet slightly before nailing it down then recover with one of the wooden battens. Hopefully instructions should come with the roofing felt. If not, do come back to us.
Im currently looking at corrugated bitumen sheet as an alternative. Onduline and Carolin are 2 brand names. It looks easier to diy than felt and although more expensive, it’s more robust and lasts much longer. Folk with stables and commercial outbuildings use it a lot so that’s a good reference in itself.
Sheets from wickes are 950mm x 2m x 3mm thick and cost £25 each although I’ve seen it on line for as little as £17 a sheet. YouTube has a couple of ok installation videos.
Rubber sheet similar to pond liner is also an option. It’s called EPDM and is availlable in kit form online. This is probably the simplest but in my opinion least attractive option.
Hope this helps and good luck.