Insulation calculator
The boards go up with staggered joints and the insulation’s thermal resistance appears.
The drawing
What you need
| Material | Calculated need | To buy | Unit price | Total |
|---|---|---|---|---|
| InsulationExtruded polystyrene 4 cm — 1.25 × 0.6 m board | 31 pieces | 31 pieces | ||
| Insulation fixingsInsulation fixing plugs — box of 100 | 130 pieces | 2 boxes | ||
| Indicative total | ||||
Working out prices…
The formula
21.6 m² × 1.05 ÷ 0.75 m² = 31; R = 0.04 m ÷ 0.034 = 1.18 m²·K/W.
The assumptions
- 5 % offcuts.
- Thermal resistance of the insulation alone, not the wall.
How to use it
Measure the area to insulate.
Choose the insulation: polystyrene, rock wool or glass wool.
Read the boards or rolls, the fixings and the resistance you get.
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