Loft insulation advice
Straight answers to the questions people ask most before getting a loft insulated.
- How much do I need?
- The recommended depth of loft insulation, why it’s 270mm for mineral wool, how different materials compare, and what to do if your loft has less.
- Checking your insulation
- A simple, safe way to check the depth and condition of your loft insulation, what to look for, and when to ask us instead.
- Signs it needs replacing
- When can old loft insulation stay, and when does it need to come out? Damp, mould, pests, compression and other signs to look for.
- Loft condensation
- Why condensation forms in lofts, why it can get worse after insulating, and the practical fixes: ventilation, sealing gaps and venting fans outside.
- Boarding over insulation
- Why laying boards straight on the joists squashes your insulation, how raised loft boarding works, and what to check before using your loft for storage.
- Insulating a boarded loft
- Your loft is boarded and the insulation under it is thin. The options: lifting and re-laying, raised boarding, insulating the unboarded parts, or the rafters.
- Cables and downlights
- Can loft insulation go over electrical cables and recessed downlights? What the risks are and how we deal with them safely.
- Pipes and tanks
- Why a well-insulated loft is colder, and how pipes and cold water tanks should be protected from frost when you insulate.
- What we check
- What we look at in your loft before quoting, and the questions worth asking anyone who quotes for loft insulation.
- Spray foam and mortgages
- Why some lenders and surveyors have concerns about spray foam on the underside of a roof, and what your options are if your home has it.
- Landlords and rented homes
- Minimum energy efficiency rules for private rented homes in England and Wales, the move to EPC C by 2030, and where loft insulation fits in.
Ready for a free loft insulation quote?
Tell us about your home and we’ll give you a written quotation before any work begins.