Insulation materials and the membranes that go with them: lambda values, the depth each needs to hit a U-value, and where vapour control belongs.
The complete UK guide to insulation: loft, wall and floor materials compared, U-values explained, and 2026 costs from £3/m² mineral wool to £35/m² spray foam.
Which draught-proofing products work, where to seal and typical costs. DIY steps can save around £55 a year, or about £100 with an unused chimney sealed.
PIR board sizes, thicknesses and 2026 UK costs: Kingspan Therma, Kooltherm and Celotex GA4000 compared by λ value, application and price per m².
Airborne and impact acoustic insulation for separating floors and walls: Part E performance targets, resilient bars, acoustic slabs, deck systems and UK costs.
Breathable roofing and wall membranes let moisture vapour out while blocking rain. Types, specifications, UK Building Regs, costs, and how to choose.
Which insulation grants you can get in 2026: ECO4, open until 31 December 2026, what the closed Great British Insulation Scheme offered, and council funds.
Solid wall insulation costs around £12,000 (internal) to £15,000 (external) for a semi. Compare IWI and EWI on U-values, disruption and fit.
Spray foam insulation costs £15–£35/m² but can cause mortgage and sale problems. The risks, lender positions and removal costs.
Full-fill mineral wool, blown EPS bead and PUR foam cavity wall insulation compared on cost, U-value, damp risk and UK Building Regs suitability.
EPS and XPS compared on compressive strength, moisture resistance, lambda values, and cost: with guidance on under-slab, perimeter and inverted roof uses.
How to insulate a garage in the UK: walls, roof, and floor options, material costs, DIY difficulty, and whether Building Regs apply to your project.
Mineral wool roll types, the 270 mm depth rule, cold vs warm loft strategies, PIR for room-in-roof, and Part L U-value targets for UK loft insulation.
PIR boards vs mineral wool: lambda values, thickness for target U-values, fire performance, cost and where each works best.
Rockwool vs glass wool vs slag wool compared: thermal performance, fire ratings, acoustic specs, costs per m², and which to choose for each application.
How to insulate suspended timber and solid concrete floors in UK homes: U-value targets, materials, costs, ECO4 grants and common mistakes to avoid.
VCLs on the warm side, breather membranes on the cold side: sd-values explained, interstitial condensation risk, taping requirements and UK costs.
Insulate a vaulted ceiling in 5 steps: assess the rafter depth, choose PIR or mineral wool, install between the rafters, add a continuous layer, then board.
Bay window roof repair and insulation guide: flat roof types, lead vs felt vs GRP, U-value targets, typical costs and common failure points. UK 2026.
An honest look at multifoil insulation: how it works, claimed vs tested performance, required air gaps, where it's useful and cost per m².
