Roof Insulation Eastleigh

Heat rises, and up to 35% of a home’s warmth can escape through an under-insulated roof. Eastleigh grew up as a railway town, and its oldest core is the grid of red-brick worker terraces near the station, built from the 1860s with continuous pitched slate roofs from an era well before thermal standards existed. Set in the low-lying, wet Itchen valley close to Southampton Water, these homes shed warmth readily, so a roof brought up to current standards trims roughly £200 to £400 a year off heating bills.

Knauf Earthwool is a mineral wool we fit between and over the rafters to a depth of 300mm — comfortably past the 270mm government minimum — to target a 0.16 W/m²K U-value. It is non-combustible, performs strongly on both thermal and acoustic measures, and holds up for decades. For the standard pitched-roof terraces and suburban semis common around Hiltingbury and Botley, Earthwool is usually the most cost-effective choice, priced between £900 and £1,200.

Where rafter depth is tight, or you want to keep the loft usable for storage or a future conversion, Superfoil multifoil reaches comparable performance in a far slimmer profile. That slim build also helps in the shallow roof spaces of the older railway terraces. Fitted between the rafters, it works as a radiant barrier as well as an insulant, which suits the room-in-roof conversions found across the borough. Superfoil is typically priced between £1,200 and £1,800 installed.

Roof insulation must satisfy Part L of the Building Regulations, which sets the minimum thermal standard. We install to a 0.16 W/m²K U-value and handle the full building-control notification for you, so there is nothing to arrange yourself. On cold-roof installations we fit 25mm eaves ventilation as standard to keep air moving and stop condensation forming in the roof space — a real concern in this damp river-valley setting. Documented compliance also counts at resale.

Our installation work comes with a 10 to 25-year guarantee depending on the product, on top of the manufacturer warranties that both Knauf Earthwool and Superfoil carry. Once it is fitted properly, roof insulation performs maintenance-free for decades, so the £200 to £400 a year a typical Eastleigh home saves keeps mounting long after the work is finished. Every job begins with a free, no-obligation survey and a fixed-price quote, with no high-pressure sales or jargon.