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Warm Roof Upgrades

Stop heating the sky.

Most flat roofs in South Yorkshire have shockingly little insulation — and you pay for it every winter. A warm roof upgrade adds non-combustible PIR insulation above the deck, meets current Building Regs, and cuts heat loss by up to 80%.

+£40/m² Class A1 PIR Meets Building Regs 80% Heat Loss Cut
Get a Price in 60 Seconds 07807 815181
Warm roof upgrade with PIR insulation installed by Sky Guard
0.18
U-value W/m²K
80%
Heat loss reduction
A1
Fire-rated PIR
+£40
Per m² extra
Why upgrade

Six reasons it’s a no-brainer.

A warm roof costs a fraction of the rest of the replacement and pays back faster than you'd think.

Lower heating bills

A properly insulated warm roof can cut heat loss through the roof by 70–80%. You feel the difference within a week.

Meets Building Regs

Current regs require a U-value of 0.18 W/m²K on roof replacements. Warm roof construction is how we hit it.

Non-combustible PIR

Class A1 fire-rated PIR insulation — safe, code-compliant, won't contribute to fire spread.

No interior disruption

All the work happens on the roof. Your ceiling, lights, and plasterboard below stay untouched.

Kills condensation

Cold roofs sweat — warm roofs don't. A warm-roof upgrade often solves the damp / black-mould problem people thought was a leak.

Pairs with single ply

A warm roof needs a flexible, watertight outer membrane. Single ply is built for it. The two systems are made for each other.

Cold roof vs warm roof

Same building — very different bill.

❄️ Cold roof (old style)
  • • Insulation between ceiling joists
  • • Cold deck sweats — condensation, mould
  • • Typical U-value 0.5–1.0 W/m²K (poor)
  • • Common in pre-2010 felt roofs
  • • Heat escapes through every joist
🔥 Warm roof (modern)
  • • Insulation above structural deck
  • • No cold surfaces — no condensation
  • • Hits 0.18 W/m²K Building Regs standard
  • • Required on most replacements today
  • • Pairs perfectly with single ply membrane
FAQ

Warm roof questions

Insulation, Building Regs, and heating bills.

What is a "warm roof"?
A warm roof puts the insulation above the structural deck — between the deck and the waterproof membrane. The whole building stays warm; the roof structure stays the same temperature as the room below. The opposite is a "cold roof" where insulation sits between the ceiling joists and the cold deck sweats.
How much does it cost?
+£40 per m² on top of a standard single ply replacement. So a 30 m² roof goes from ~£2,700 to ~£3,900 with the upgrade. Honestly — it pays for itself in heating bills within 5–8 years on most properties.
Do I need it?
If you're replacing the roof anyway: yes, almost always. Building Regs require a U-value of 0.18 W/m²K on flat roof replacements, and a warm-roof upgrade is how we hit that. There are exceptions for like-for-like repairs.
Will it raise the roof height?
Yes — typically by 100–160 mm. Worth knowing if you've got windows, doors, or upstands at the existing roof level. We measure carefully and tell you up front if it's an issue.
Can you upgrade my existing roof without a full replacement?
Sometimes. If the existing membrane is sound, we can overlay insulation + new single ply membrane directly over the top. This works on roofs in reasonable condition — we'll survey and tell you honestly.
Is the insulation safe?
Yes — we use Class A1 fire-rated PIR insulation, BBA-certified and fully compliant with current Building Regs including post-Grenfell fire safety amendments.

Ready for a roof that actually lasts?

Free survey, no hard sell, transparent pricing. Speak to a real roofer in 30 seconds.

Get Free Estimate Call 07807 815181