Enter the area you're insulating and pick a board or roll type. The calculator works out how many packs to order, including a waste allowance for cuts.
Enter the area you are insulating — loft, wall, floor or roof — and we will work out how many boards, rolls or packs to order.
10 boards
24.0m² area, 26.4m² with cuts allowed
Coverage figures are typical pack sizes — check the label, and allow extra for awkward joists or rafters.
How it works
1Measure the area in metres — floor, wall or loft. For a loft, measure the footprint you'll be covering.
2Pick the product. Rigid boards suit floors and walls; mineral wool rolls suit lofts and between studs.
3Add a waste allowance. Cutting boards around joists and noggins typically loses 5–10%.
4Read the packs to order, then check the comparison for the cheapest merchant near you.
Insulating a roof? The roofing calculator works out tiles, slates, battens and breathable underlay for the same slopes.
Take your quantities across to Price Planter and compare them across UK builders' merchants — including whether splitting the order across two merchants works out cheaper.