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Felt Roofing Systems

Durable built-up felt systems for flat and low-pitch roofs, installed to last.

Newly finished flat roof with a clean, well-laid waterproof membrane and neat upstands

Built-up felt remains one of the most dependable ways to waterproof a flat or low-pitch roof. We install and repair modern felt systems that stand up to the British weather for years.

For tired roofs that don't need a full strip-off, we can also overlay with a cold-applied liquid system.

Cornerstone Group installs a number of market-leading felt roofing systems in APAO, APP and SBS materials.

Built-up felt & single-ply
Waterproof & durable
Flat & low-pitch roofs

What’s included

Built-up bituminous felt systems

Flat and low-pitch roofs

Torch-on and cold-applied options

Repairs and localised patching

Insulation upgrades

New rooflights and detailing

Felt roofing systems

Systems are available in both traditional torch-applied and fully cold-applied versions to suit your site installation requirements.

Felt roofing solutions

Available as single-layer overlay systems or a fully insulated roof build-up to current warm-roof regulations. Tapered insulation schemes can be introduced to an existing flat roof to create effective falls and eliminate ponding water. After moisture-scanning the existing roof, many existing waterproofing systems can be overlaid to reduce cost and minimise disruption on site.

Seen in our projects.

Flat roof finished in a seamless white liquid membrane

Roofing · OverlayLiquid Roof Overlay

Restoration · LeisureYe Horns Inn

Energy · 334 kWpBooker Watford

All case studies

On the roof

Protecting the envelope.

Cladding, sheeting and roof systems on working commercial, agricultural and industrial buildings.

Solar PV on the metal roof of a farm building at Bilsborrow Hall Farm, Lancashire — RoofingRoof and solar

Large industrial roof from the air with a new rooftop array — RoofingBooker Watford

Profiled metal roof sheets and ridge detail — RoofingProfiled metal roofing

Booker Newton Abbott roof with solar on both pitches — RoofingBooker Newton Abbott

New roof and solar on the Booker Watford warehouse — RoofingBooker Watford

Industrial building with green profiled metal roof and wall cladding — RoofingRoof cladding

See the projects

Guides and project stories.

All insights

GuidesShould you re-roof before installing solar? The case for doing both togetherWhy roof condition matters before solar, how a combined roof and solar project works, and the warranty when we fit the roof and the solar.Read the article

GuidesAsbestos cement roofs: your options for removal, over-cladding and re-roofingOptions for ageing asbestos cement and fragile roofs: removal, over-cladding and re-roofing, how safety is managed and how to add solar.Read the article

Renewable EnergyOne roof, one array, one 30-year warrantyHave Cornerstone fit your new roof and install your solar, and both are covered by a single combined 30-year warranty.Read the article

Power your business with solar.

Our renewables team designs, installs and maintains commercial solar, storage and EV charging across the North West and the UK.

Commercial solar PV installationRoof and ground-mounted solar sized to how your building uses power, with a clear payback.Roof and solar with a 30-year warrantyWhen we fit the roof and install the solar, both are covered by one combined 30-year warranty.Battery storage for businessStore cheap or solar power and use it at peak times to cut bills further.

FAQs

Felt roofing questions answered.

Can't see your question here? Our team is happy to talk it through.

Is built-up felt still a good choice for a flat roof?

Yes. Built-up felt remains one of the most dependable ways to waterproof a flat or low-pitch roof, and we install market-leading systems in APAO, APP and SBS materials.

Do you offer torch-on and cold-applied felt systems?

Both. Systems are available in traditional torch-applied and fully cold-applied versions, so we can match the method to your site installation requirements.

Can you overlay my existing flat roof instead of stripping it?

Often, yes. After moisture-scanning the existing roof, many waterproofing systems can be overlaid to reduce cost and minimise disruption on site, and tired roofs can also be overlaid with a cold-applied liquid system.

Can you fix water ponding on our flat roof?

Tapered insulation schemes can be introduced to an existing flat roof to create effective falls and eliminate ponding water. This can be combined with a fully insulated build-up to current warm-roof regulations.