What U-value does SuperFOIL achieve?

SuperFOIL insulation can achieve U-values as low as 0.11 W/m²K, meeting UK Building Regulations Part L.

SuperFOIL Insulation for Roofers | Save Energy & Cut Heat Loss

Q: What is SuperFOIL insulation?

SuperFOIL is a multifoil insulation made from multiple layers of pure aluminium foil and wadding that reflects up to 97% of radiant heat.

The Technology

What is SuperFOIL Insulation?

SuperFOIL is a British-engineered multifoil insulation system that outperforms traditional mineral wool at a fraction of the thickness.

Unlike bulky fibreglass batts, SuperFOIL insulation uses multiple layers of pure aluminium foil separated by wadding layers. This construction traps air pockets and simultaneously reflects radiant heat — the dominant mode of heat transfer in roofs and lofts. Our products are available directly from our main website, SuperFOIL Roofs.

Every SuperFOIL insulation roll is manufactured in the UK to ISO 9001 standards. The result is a low-emissivity product capable of achieving SuperFOIL insulation u value figures as low as 0.11 W/m²K, surpassing the minimum requirement of 0.16 W/m²K set out in Building Regulations Approved Document L.

Independent SuperFOIL insulation reviews consistently highlight three key advantages: speed of installation, depth of space saved in the roof zone, and measurable reductions in energy bills within the first heating season.

25-year manufacturer warranty on all products
Independently tested by the British Board of Agrément (BBA)
Compliant with BS EN ISO 6946 and TIMSA guidelines
Safe to handle — no irritating fibres or chemical binders
Vapour control layer integrated — no separate membrane required

Home kept warm in winter with SuperFOIL insulation — £400+ annual energy savings

£400+ Average annual energy saving per household

Why Choose SuperFOIL

Five Reasons Roofers Choose SuperFOIL

From condensation control to carbon footprint, SuperFOIL delivers measurable advantages on every job.

Energy Efficiency

SuperFOIL's pure aluminium layers reflect up to 97% of radiant heat back into your home in winter and repel solar gain in summer — typically slashing heating bills by £400 or more per year.

Up to 97% heat reflected

Space-Saving Design

A typical SuperFOIL insulation roll installs at just 40–60 mm thick while achieving the same thermal performance as 200 mm+ of mineral wool. In tight roof pitches and dormers, this slim profile is a genuine game-changer.

60 mm vs 200+ mm mineral wool

Easy Installation

SuperFOIL rolls cut with scissors or a Stanley knife, staple to rafters or joists, and tape at all joins. A competent roofer can insulate a standard detached roof in a single day — half the time of rigid board alternatives.

One-day roof installation

Moisture & Vapour Control

SuperFOIL's aluminium surface acts as an integrated vapour control layer, eliminating the need for a separate membrane and dramatically reducing interstitial condensation — a leading cause of structural timber decay in UK roofs.

Integrated vapour control

Eco-Friendly & Cost-Saving

SuperFOIL is manufactured with zero waste to landfill. All off-cuts are fully recyclable. Its 25-year warranty means fewer replacement cycles and less embodied carbon — one of the most sustainable insulation choices available to UK roofers.

Zero waste to landfill

Simple Process

How to Install SuperFOIL Insulation

01

Measure & Order

Calculate your roof, wall or floor area. Choose the correct SuperFOIL product. Order your roll — we deliver across the UK next day.

02

Cut to Size

Unroll SuperFOIL and cut to fit between rafters or joists using scissors or a Stanley knife. No special tools or respirator required.

03

Fix & Tape

Staple or batten the insulation in place. Seal all joints with SuperFOIL aluminium tape to create a complete airtight, vapour-controlled envelope.

04

Enjoy the Savings

From the first cold night, your client will notice the difference. Lower energy bills, a warmer home, no more condensation — guaranteed for 25 years.

Where It Works

SuperFOIL Applications

One product family — multiple applications. SuperFOIL multifoil insulation is the roofer's choice for every element of the building envelope.

SuperFOIL multifoil insulation installed between rafters in a British pitched roof

Roofs & Lofts

SuperFOIL is the UK roofer's first choice for pitched-roof insulation. Installed between and below rafters, it achieves regulatory compliance where traditional methods would require two separate layers.

✓ Pitched roofs (20°–60° pitch)
✓ Cold and warm roof constructions
✓ Loft conversions & dormer extensions
✓ Flat roofs (with appropriate product)

SuperFOIL multifoil insulation being fitted to an external masonry wall

Walls

Whether you're insulating solid stone walls, timber-frame panels or cavity walls, SuperFOIL's slim profile means you lose minimal internal space while meeting current Part L requirements.

✓ Solid masonry (external & internal)
✓ Timber-frame and SIPs panels
✓ Garden offices & outbuildings
✓ Party walls & separating walls

SuperFOIL multifoil insulation laid beneath a suspended timber floor

Floors

Cold floors account for up to 15% of total heat loss in older UK properties. SuperFOIL floor insulation provides a warm, draught-free surface underfoot without sacrificing floor-to-ceiling height.

✓ Suspended timber floor decks
✓ Concrete ground floors
✓ Above and below existing joists
✓ Under-floor heating systems

Customer Reviews

What UK Roofers Say

★★★★★

"I've been fitting SuperFOIL on every loft conversion for the past three years. The clients are always happy — warmer houses and the installation is half the time of rigid board. Absolutely wouldn't use anything else now."

James T.Roofing Contractor, Manchester

★★★★★

"Fitted SuperFOIL to my Victorian terrace last autumn. First heating bill this winter was £340 less than the same period last year. I couldn't believe it. Easy to fit as well — I did the whole roof in a weekend."

Sarah M.Self-builder, Bristol

★★★★★

"SuperFOIL is the only insulation I specify for garden studios now. It handles summer heat and winter cold equally well — clients never complain about temperature and condensation is a thing of the past."

Dave K.Garden Building Specialist, Surrey

Common Questions

Frequently Asked Questions

Everything you need to know about SuperFOIL insulation before your next job.

What exactly is SuperFOIL insulation and how does it work?

SuperFOIL insulation is a multifoil product made from multiple layers of pure aluminium foil separated by polyester wadding. The foil layers have very low emissivity (≤0.03), meaning they reflect up to 97% of radiant heat rather than absorbing it. In a cold roof, this means heat stays inside the building. In summer, solar heat gain is reflected away, resulting in a comfortable indoor temperature year-round.

What SuperFOIL insulation u value can I achieve?

The SuperFOIL insulation u value depends on the specific product and installation configuration. In a standard between-rafter pitched roof installation using SFUF40, a U-value of 0.16 W/m²K (the Part L maximum) is easily achievable. Combining with an additional SuperFOIL layer below rafters, you can reach 0.11 W/m²K — well above compliance. All U-values are calculated in accordance with BS EN ISO 6946.

What do SuperFOIL insulation reviews say?

Independent SuperFOIL insulation reviews consistently highlight three advantages: speed of installation (typically 50% faster than rigid board), headroom savings (40–60 mm vs 200+ mm), and measurable energy bill reductions within the first heating season. Our Trustpilot rating is 4.9/5 from over 1,200 verified customer reviews.

How do I buy a SuperFOIL insulation roll?

You can order your SuperFOIL insulation roll directly through our contact form, by phone on 07777 444 221, or by email at info@superfoilroofers.co.uk. We offer next-day delivery across mainland UK and can supply both trade quantities and individual rolls for self-builders.

Do I need planning permission to install SuperFOIL?

In most cases, insulating a roof, wall or floor with SuperFOIL is considered permitted development and does not require planning permission. However, if your property is a listed building or within a conservation area, check with your local planning authority before proceeding. Building Regulations approval (Part L) will typically apply to new-build and certain renovation projects — SuperFOIL meets and exceeds all current requirements.

Is SuperFOIL safe to handle and install?

Yes. Unlike glass wool or mineral fibre products, SuperFOIL does not release airborne fibres during installation. No respiratory protection, gloves or special clothing are legally required (though basic PPE is always recommended for any building work). SuperFOIL contains no chemical binders, formaldehyde or irritants, making it a safer working environment for your team.

Get In Touch

Ready to Quote Your Next Job?

Whether you need trade pricing for a large roof contract or just want to discuss the right SuperFOIL product for your application — our technical team is here to help.

Phone 07777 444 221 Mon–Fri 8am–6pm, Sat 9am–1pm

Email info@superfoilroofers.co.uk Reply within 1 business day

Coverage Mainland UK Next-day delivery available

SuperFOIL Technical Team

Our team includes NVQ-qualified roofers, building surveyors and energy assessors with a combined 40+ years of experience in UK roofing and insulation. All recommendations backed by BBA certification and BS EN ISO 6946 test data.

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