If it is a case that the felt has failed completely the only correct way is to replace it and i am afraid a roof refurbishment is often required after 40 years or more refelted with a breathable roof membrain not felt is the correct way approved by building control.
Replacing roof felting.
Shed roof felting replacing worn and split felt on the roof of a shed is essential if you want your tools and other garden equipment to stay in good condition you should aim to check the condition of your shed roof felt at least once a year.
Repairability easy and cheap to repair with a number of solutions such as liquid torch on felt or even laying another roof on top.
I have even laid a torch on roof onto an already repaired 40 or 50 year old roof and got another 20 30 years out of it.
In any case these are all the most common re roofing needs.
Doing this will allow you to spot potential problems early rather than waiting until water starts to drip into the shed.
The cost of a flat roof replacement varies depending on which materials you decide to use for the job.
Flat roofs are usually covered in bituminous based asphalt or roofing felt and tend to have a shorter life than pitched roofs.
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The cost of replacing roof felt under tiles will be included in the overall tiled roof roof repair costs.
If you have a problem with your flat roof it s best to get a professional to look at it although you can buy a special sealant for making your own repairs to splits or blisters in the roofing felt.
To replace a small section of roofing felt involves stripping the tiles from the roof and replacing felt between two joists.
Allow any wet plywood to dry out.
Remove excess felt nails and adhesive before replacing the felt on your flat roof.
Materials breathable membrane plus mortar for ridge tiles removed repairing felt.
Labour 1 day x 2 people 1 x 160 1 x 100 50.
There should be no extra debri of any kind on the decking before you begin.
Felt typically costs around 50 per square meter whereas more high end materials such as fibreglass usually come in at just under 100 but they provide more aesthetic options.
Friendly tips at this point i would like to point out to you that the costs for re felting a small garage roof are much lower than the costs of replacing a large slate tiles roof.
Holes in roofing felt are quite common here we repair a hole in some roofing felt that is underneath the tiled roof.
Nail the first layer of felt to the plywood using 20mm galvanised clout nails with large heads spaced every 150mm along the planks.
This will cost around 460 510 made up of.