Felt Roofing Birmingham: Three Layer Torch-On Replacement
A three-layer torch-on felt roof is the lowest capital cost flat roof still worth fitting, and the honest case for it rests entirely on how long the building needs the roof to last. Book a survey and the torch-on felt roof is measured, photographed and priced in one visit. It covers: Torch-on felt · Cap sheet.
- On site in 45 to 90 minutesEvery elevation photographed from ground level and ladder, and the roof void inspected from inside.
- A written report in two daysDefects separated into immediate, this season and monitor, with photographs against each.
- An itemised written scopeAgreed and signed before anyone starts, with no variation without a new figure.
Call the crew07446 375079
Monday to Friday, eight until six, and Saturday mornings. Emergency make-safe runs outside those hours.
Crews work across 8 Birmingham and Solihull districts: Sutton Coldfield, Harborne, Edgbaston, Moseley, Solihull, Erdington, Kings Heath and Selly Oak. Postcodes outside that run are quoted case by case rather than turned away.
- Free survey No charge for the survey, and none if the report says nothing needs doing.
- Own crews The people who survey the roof are the people who lay it. No subcontracting, no lead resale.
- Written scope first Quoted as an itemised scope agreed before work starts.
- Workmanship warranty Issued in writing on completion. Sole trader, no scheme registration.
Felt is the cheapest flat roof to fit. Divided by the years it lasts, that advantage reverses — which is the calculation nobody publishes.
| System | Per m² | Service life | Per m² per year |
|---|---|---|---|
| Torch-on felt | £40–£60 | 10–20 years | £2.00–£6.00 |
| EPDM rubber | £80–£120 | 20–30 years | £2.67–£6.00 |
| GRP fibreglass | £60–£100 | 25–40 years | £1.50–£4.00 |
Torch-on felt costs £40–£60 per m² and lasts 10–20 years, which is £2.00–£6.00 per m² per year. EPDM rubber costs £80–£120 per m² and lasts 20–30 years, which is £2.67–£6.00 per m² per year. GRP fibreglass costs £60–£100 per m² and lasts 25–40 years, which is £1.50–£4.00 per m² per year. Felt also carries hot works: flame applied on site next to timber, which requires a fire watch after the crew leaves.
What we fix
Is felt roofing still worth fitting?
Yes, on outbuildings and garages where a shorter horizon suits the budget. Felt is rarely the right choice over a habitable extension, where a longer-lived system costs less across the period the room will be in use.
Torch-on felt means reinforced bitumen sheets heat-bonded in three successive layers. A cap sheet is the mineral-finished top layer providing UV protection and the finished appearance. Torch-on felt lasts 10 to 20 years, the shortest of the domestic systems.
How it works
Falls matter more on felt than on anything else.
- Three heat-bonded layers build redundancy into the covering.
- An open flame on site requires a fire watch after a completion.
- A lowest install cost does not produce the lowest cost per year of service life.
- Standing water degrades felt faster than any other domestic system.
What it costs
What torch-on felt roof costs
- Torch-on felt £40–£60 supplied and fitted, the lowest capital cost
Straight answers
What does a three-layer felt roof involve?
A felt roof is built in three bonded layers: a base sheet fixed to the deck, an intermediate layer, and a mineral-finished cap sheet heat-bonded over both. Falls are corrected with firrings before the first layer goes down.
- Felt is cheapest to install and dearest per year of service life.
- The risk of the hot works is flame applied on site adjacent to timber, requiring a fire watch after completion.
How long does a felt roof last?
A three-layer torch-on felt roof lasts ten to twenty years. Standing water, poor falls and heavy foot traffic move it toward the lower end. It is the shortest-lived of the domestic flat roof systems.
Blistering, seam lifting at laps, and surface embrittlement with age. A cold or hot-bitumen method avoiding open flame on sensitive buildings.
Is felt actually the cheapest option?
Only to install. At fifty pounds per square metre across fifteen years, felt costs more each year than rubber at one hundred pounds across thirty. Lowest capital cost and lowest lifetime cost are different systems entirely.
The unsuitable application of torch-on felt is habitable extensions where a longer horizon justifies a better system. Falls corrected at renewal, because felt is least tolerant of ponding.
- Torch-on felt suitable application: detached garages, sheds, outbuildings, and low-value short-horizon roofs
What are the fire precautions?
Torch-on work applies open flame directly against a timber deck. Combustible material is cleared, a fire extinguisher is kept at the work face, and a fire watch continues for a period after the crew finishes.
Why the falls get corrected at renewal
Felt is the cheapest to fit at £40–£60 per m², and that advantage reverses on cost per year of service life: £2.00–£6.00 against GRP's £1.50–£4.00. Flame applied against timber requires monitoring after the crew leaves; contractors who skip it are the reason felt roofs feature in fire reports.
Book a flat roof survey
For a habitable extension, felt is usually the wrong specification, and saying so costs a sale and earns the next one. The shortest-lived system is also the one standing water damages fastest, so falls must be corrected at renewal rather than deferred.
Torch-on felt, and 6 more
- torch-on felt
- cap sheet
- lap
- blistering
- hot works
- fire watch
- firring
Recent work
Job photographs are added as each contract completes, with the date, the district and the defect named in the caption.
Where we work
8 Birmingham and Solihull districts
- Sutton Coldfield
- Harborne
- Edgbaston
- Moseley
- Solihull
- Erdington
- Kings Heath
- Selly Oak
Postcodes outside that run are quoted case by case rather than turned away.
Related pages
Book a torch-on felt roof survey
A survey takes forty-five to ninety minutes and the written report follows within two working days. Nothing is charged for the survey, and nothing is charged if the report says nothing needs doing.