Interstitial condensation
Wrong board, wrong vapour control, or no detailing at openings traps moisture inside the build-up. Result: hidden rot, mould, and structural damage years later.
Specialist service · Rochdale & the North West
Insulated External RenderLower Bills.Warmer Home.
External wall insulation systems that genuinely cut heating bills 20–35% — finished with a premium silicone render and backed by a 25-year manufacturer system warranty.
5-star Google-rated · 40+ years combined experience · Free written quote within 24 hours
20–35%
Heating-bill reduction
25-yr
System warranty
BBA
Certified systems
Funding
Routes available
Free
Energy survey
Service overview
Done right, insulated render (ewi) adds 25+ years of value.
External wall insulation (EWI) wraps your home in 60–150mm of insulation board, finished with a full render system. Heating bills drop 20–35%, draughts disappear, internal walls warm up — and you get a brand-new render finish at the same time. For solid-wall homes built before 1930, EWI is the single biggest energy upgrade available.
What it is
EWI is a system: insulation boards (EPS or mineral wool) mechanically and adhesively fixed to the external wall, covered with a polymer base coat and reinforcing mesh, then finished with a silicone or acrylic topcoat in any colour.
Who it's for
Solid-wall homeowners with cold internal walls, landlords meeting MEES regulations, eligible households accessing ECO4 and similar funding, and self-builders specifying high-performance external wraps.
When you need it
Where existing render is failing AND heating bills are high — EWI delivers both fixes at once. Also when modernising a tired exterior and you'd benefit from the thermal upgrade.
Why a specialist matters
EWI is an engineered system. Get the fixings wrong, the bead detailing wrong, or the substrate prep wrong and you create a thermal-bridge problem worse than no insulation. Manufacturer-trained installers deliver the warranty.
The cost of getting it wrong
Why DIY-grade EWI is worse than no insulation
EWI failures are catastrophic — and almost always caused by cutting corners on system specification.
Thermal bridging at openings
Window and door reveals must be insulated and detailed properly. Skip it and you get cold spots, condensation and mould on internal reveals.
Mechanical fixing failure
Wrong fixing pattern or wrong fixing for substrate causes boards to detach years later — taking the render with them.
No warranty
BBA-certified systems only carry warranty when installed by registered installers using the full system. Mixed-and-matched parts = no cover.
Our process
Five steps, zero surprises.
Same process on every job — domestic, commercial, single-room or full house.
Energy & survey assessment
We assess wall construction, U-value, internal moisture, exposure rating, and recommend the right system depth and finish.
Funding & specification
Where eligible we'll flag ECO4 and other regional funding routes. You receive a detailed written quote and timeline.
Scaffold & substrate prep
Scaffold up, substrate cleaned, defective brickwork repaired, openings prepared for reveal detailing.
Insulation & mesh
Insulation boards fixed adhesively and mechanically per system spec; base coat applied with full alkali-resistant mesh embedment.
Silicone topcoat & sign-off
Topcoat applied wet-on-wet across full elevations; system registered with manufacturer for full warranty.
Why MCB
Specific benefits — not vague promises.
20–35% lower heating bills
Independent assessments consistently show heating-cost reductions in this range for solid-wall homes after EWI.
Warmer internal walls
Internal surface temperature rises by 4–7°C — eliminating cold spots and condensation/mould issues.
No internal disruption
All work is external. You keep your skirting boards, plug sockets, radiators and internal decoration.
Brand-new render finish
You get a premium silicone render facade as part of the same package.
25-year system warranty
Full manufacturer warranty when installed by registered specialists — backed by our workmanship guarantee.
Asset value uplift
EPC rating improves; resale value rises; rental properties move into compliance.
In depth
EWI systems in detail
EWI is an engineered system with multiple layers, each doing a specific job. Here's how a correctly specified installation is built up.
The substrate has to be sound, clean and stable. Pebble dash, loose paint, damp brickwork — all of it has to be addressed before any insulation goes on. We tap-test the existing wall, repair where needed, and document substrate condition before quoting.
Insulation boards (typically 90–150mm EPS or 90–120mm mineral wool) are fixed with both adhesive and mechanical fixings — typically 6 fixings per board, in a pattern set by the system manufacturer. Mineral wool is heavier and more fire-resistant; EPS is cheaper and easier to detail. Spec depends on building height, fire-strategy and budget.
Reveal detailing is where most installers cut corners and where most failures originate. Window and door reveals must be wrapped in insulation, mesh and beads to maintain thermal continuity. We use system-matched reveal beads and detail every opening to manufacturer specification.
The base coat is applied at 6–8mm with full alkali-resistant mesh embedment, including additional 45° corner-reinforcement mesh at every opening. The silicone topcoat goes on wet-on-wet across whole elevations, in any RAL or system colour. The job is then registered with the manufacturer for the full 25-year warranty.
Residential
Typical 3-bed semi is 3–5 weeks on site including scaffold and weather windows.
Commercial
Commercial EWI is programme-led with phased scaffold, traffic management, and main-contractor coordination.
FAQs
Answers to the questions we hear most.
Not seeing yours? Call 07540 112744 — we answer the phone ourselves.
Ask us anythingRelated services
Often paired with insulated render (ewi)
- K Rend & Grey CaulkPremium silicone render specialists.
- RenderingWeatherproof external finishes.
- Tyrolean RenderTextured Tyrolean finishes.
Areas we cover
Insulated Render (EWI) across the North West
- WhitworthLancashire
- RochdaleGreater Manchester
- BuryGreater Manchester
- OldhamGreater Manchester
- BurnleyLancashire
- RawtenstallRossendale Valley
- BacupRossendale Valley
- AccringtonLancashire
- BoltonGreater Manchester
Free, no-obligation quote
Ready for insulated render (ewi) done properly?
Written fixed-price quote within 24 hours. Tidy site, time-served team, 5-year workmanship guarantee.
Fully insured · 5-year guarantee · 24-hour quote turnaround