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Complete new roofs stripped to the timbers and rebuilt, with one fixed written price.
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Roof felt replacement in Windsor, Berkshire and South West London, with perished bitumen felt stripped out and replaced with modern breathable membrane and new treated battens. Book a free roof inspection and you get photos from your loft and a fixed written quote.
Under every tiled or slated roof there is a second line of defence: the felt, or underlay. Tiles shed most of the rain, but wind drives some of it up and under them, and the felt catches that water and carries it down to the gutter. When the felt fails, your roof leaks even with every tile in place.
Older homes across Windsor and Berkshire were felted with black bitumen felt. Over the decades it dries out, goes brittle and sags between the rafters. Then it tears, and the tear sits exactly where the water runs.
You can check it yourself from the loft with a torch:
Felt sits under the battens and tiles, so replacing it properly means taking the roof covering off and building it back up.
The tiles or slates, the old battens and the perished felt come off, down to the rafters, with scaffold and edge protection in place.
With the roof open we check every rafter and the eaves, and make good anything that has rotted before anything new goes on.
New breathable membrane is laid and lapped across every slope, then new treated battens are fixed to the correct gauge.
The roof is covered again, finished with a dry ridge and fresh flashings, and backed by our workmanship guarantee.
Old bitumen felt keeps water out but traps moisture in. Warm, damp air from the house rises into the loft, meets the cold underside of the felt and condenses, which is how lofts end up with damp timbers and mould even when the roof is not leaking.
Modern breathable membrane stops liquid water coming in but lets water vapour out. The roof space stays drier, the rafters stay sound and the battens last. It is also lighter and tougher than bitumen felt, so it does not go brittle and tear in the same way.
On our recent re-roofs that meant VapR-free membrane in East Ham and Permavent in Fleet. New treated battens go on at the same time, graded and fixed to the right gauge for your tile or slate. Old or undersized battens are the reason tiles slip, so this is the moment to get them right.
If the felt has torn in one small area, under a single leak, we cut back to sound felt and lap in a new piece of membrane as part of a repair. Our roof repair cost guide puts larger partial repairs, such as re-felting a section, at £750 to £2,500 for 2026, and where scaffolding is needed the quote says so.
When the felt has perished across the whole roof, patching is money down the drain. The felt cannot be swapped without lifting everything on top of it, so the right job is a full strip, membrane, battens and re-cover. Our new roof cost guide covers that, with a 3-bed semi in concrete tile at £7,000 to £11,000 including scaffolding, strip and disposal, new membrane and battens.
We will tell you which side of that line your roof is on, with photos from your loft to show you why.
From the garden this Fleet roof still looked like a roof. With the tiles off, the old underlay had gone brittle and torn and the battens were splitting at the fixings. We stripped it to the rafters, laid new Permavent breathable membrane and new treated battens, then re-tiled.
Tell us what you can see in the loft and we will book a free inspection, photograph the felt and give you a fixed written quote. Water coming through torn felt now? Call us any time.
Tell us about the job, we usually reply within the hour.
Prefer to talk? Speak to Cornelius on 01753 330566 or
Expert Roofer Verified member“Seal Pro Roofing did a superb job on our roof replacement. They were punctual, tidy and kept us informed throughout. The workmanship was excellent and the price was fair. Very impressed with their customer service and would happily use them again in future.”
“Seal Pro Roofing delivered a great service. The team were knowledgeable and worked carefully to ensure everything was done properly. The roof looks solid and well finished. Very happy with the professionalism shown.”
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