Vanguard ECOwarm Warm Roof Systems
Your Roof Is Losing Heat Right Now. A Warm Roof Upgrade Stops That.
Most commercial flat roofs built before 2006 have little or no insulation. That means your heating system is working overtime, your energy bills are higher than they need to be, and your building doesn’t meet current thermal standards. A warm roof upgrade fixes all of that — and eliminates ponding water at the same time.
The Problem
Cold Roofs Cost You Money Every Single Day
A typical uninsulated flat roof loses heat at a rate 5–8 times higher than current Building Regulations allow. On a 1,000m² warehouse, that can translate to thousands of pounds in wasted energy every winter.
But the cost isn’t just financial. Cold roof build-ups are prone to interstitial condensation — moisture forming inside the roof structure — which degrades insulation, corrodes fixings, and shortens the life of the waterproof membrane. You’re paying to heat the sky and damaging your building at the same time.
A warm roof upgrade moves the insulation above the structural deck, keeping the entire roof structure warm and dry. It’s the single most effective thermal improvement you can make to a commercial building.
Why ECOwarm
What a Warm Roof Upgrade Gives You
Dramatic Thermal Improvement
Most pre-2006 commercial flat roofs have little or no insulation. A warm roof upgrade can take a U-value from 1.5+ W/m²K down to 0.18 or better — cutting heat loss by over 85%.
Eliminate Ponding Water
Every ECOwarm scheme includes a bespoke tapered insulation design that creates positive falls across the entire roof. No more standing water, no more accelerated membrane deterioration.
Multiple Insulation Options
PIR boards for standard build-ups, tapered schemes for drainage, Vacuum Insulation Panels (VIPs) where height is restricted, and Isolocore 10 mm panels for ultra-thin refurbishment.
Building Regulations Compliant
When you replace more than 50% of a roof covering, Building Regulations require you to upgrade thermal performance. We handle the compliance so you don’t have to.
Lower Energy Bills
A properly insulated roof reduces heating demand immediately. Most building owners see a measurable drop in energy costs from the first winter after installation.
Transparent Pricing
ECOwarm warm roof upgrades typically cost £60–£180+ per m² depending on insulation type, target U-value, and substrate condition. We publish our ranges — no hidden extras.
Insulation Options
The Right System for Your Building
There’s no one-size-fits-all insulation. The best choice depends on your available height, target U-value, budget, and the specific constraints of your roof. We specify the right option — not just the one we install most often.
Standard PIR Warm Roof
Rigid polyisocyanurate (PIR) insulation boards mechanically fixed or fully adhered to the existing deck, with a new waterproof membrane on top. The workhorse of commercial roof refurbishment — cost-effective, proven, and available in thicknesses from 50mm to 200mm+.
Best for: Most commercial flat roofs with adequate parapet height
U-value: 0.18–0.25 W/m²K typical
Tapered Insulation Schemes
Factory-cut insulation boards that create designed falls across the roof, eliminating ponding water and directing drainage to outlets. We design bespoke fall schemes for every project — no two roofs are the same.
Best for: Flat roofs with poor or no falls, ponding issues
U-value: Varies by average thickness — typically 0.18–0.22 W/m²K
Vacuum Insulation Panels (VIPs)
Where conventional insulation is too thick — restricted parapets, door thresholds, rooflights — VIPs deliver the same thermal performance in a fraction of the thickness. Up to 5x more effective per millimetre than PIR.
Best for: Height-restricted situations, conservation areas, refurbishment
U-value: 0.18 W/m²K in as little as 40mm total build-up
Isolocore 10 mm Ultra-Thin
The thinnest high-performance insulation available. Isolocore 10 mm VIP panels deliver exceptional thermal performance in just 10 mm of thickness — ideal where every millimetre counts. Perfect for overlay situations where raising the roof level must be minimised.
Best for: Extreme height restrictions, overlay refurbishment, threshold details
U-value: Exceptional performance in minimal depth
Our Process
How a Warm Roof Project Works
Survey & Assessment
We inspect the existing roof, test for trapped moisture, assess structural capacity, and measure parapet heights. You get a written report with photographs.
Design & Specification
We design a bespoke insulation scheme — including tapered falls, VCL positioning, and the right insulation type. You approve the specification before we start.
Installation
Our directly employed teams install the insulation and new waterproof membrane. No subcontractors, no surprises. Work is inspected at every stage.
Handover & Maintenance
You receive a completion pack with guarantee documents, as-built drawings, and a maintenance schedule. Roof Shield™ keeps everything protected long-term.
Common Questions
What You’re Probably Wondering
Do I need to strip the existing roof to add insulation?
Not always. If the existing membrane is well-adhered and in reasonable condition, we can often overlay — adding insulation and a new waterproof layer on top. This is faster, cheaper, and avoids sending tonnes of material to landfill. But if there’s trapped moisture in the existing build-up, it needs to come off. Our survey tells you which approach is right.
What U-value do I need to achieve?
Building Regulations (Approved Document L) require a U-value of 0.18 W/m²K for new-build and 0.18 for renovations where reasonably practicable. If achieving 0.18 would be impractical (height restrictions, for example), you can agree a relaxation with Building Control — but you need to demonstrate you’ve gone as far as reasonably possible. That’s where VIPs and Isolocore come in.
How thick does the insulation need to be?
To hit 0.18 W/m²K with standard PIR, you’re looking at around 130–150mm. With VIPs, you can achieve the same in roughly 40mm. With Isolocore 10 mm, even less. The right choice depends on your available height, budget, and the specific constraints of your building.
What about condensation risk?
A warm roof design places insulation above the deck, keeping the structure warm and dramatically reducing condensation risk. We include a vapour control layer (VCL) below the insulation as standard, and every scheme is designed in accordance with BS 6229 to manage moisture movement correctly.
What does a warm roof upgrade cost?
Typically £60–£180+ per m², depending on insulation type (PIR is cheapest, Isolocore most expensive), roof complexity, access, and substrate condition. A 500m² office roof with standard PIR and tapered drainage might be £40,000–£60,000. We provide a detailed breakdown with every quotation.
What Our Clients Say
“We manage 40+ commercial properties across the South East. Vanguard surveyed our entire portfolio, gave us a prioritised maintenance plan, and have been managing the programme ever since. The reporting alone saves us hours every quarter.”
Portfolio Director
Managing Agent, WGP Maintenance
“We’d been patching the same warehouse roof for three years. Vanguard assessed it, specified a full overlay system, and delivered it in two weeks. Fixed price, no extras, full documentation. Exactly what we needed.”
Facilities Manager
Facilities Management, Accor Hotels Group
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