Calculator
How much Warmcel 100 do I need?
We recommend insulating your loft to a total thickness of 300mm (building regulations require 250mm),
however you are of course free to insulate to whatever thickness you
choose. Use the chart below to decide how much you need.
One bag weighs 8kg, and contains 0.25 m3.
| Thickness | 1 bag covers | No of bags for 1 m2 |
| 100mm | 2.50 m2 | 0.4 |
| 150mm |
1.66m2 |
0.6 |
| 200mm |
1.25m2 |
0.8 |
| 225mm |
1.10m2 |
0.9 |
| 250mm |
0.99m2 |
1.0 |
| 275mm |
0.9m2 |
1.1 |
| 300mm |
0.74m2 |
1.3 |
| 350mm |
0.70m2 |
1.4 |
A loft of 50 m2 (with 225 mm insulation) would need 50 X 0.9 = 45 bags
A loft of 80 m2 (with 150 mm top up insulation) would need 80 X 0.6 = 48 bags
A loft of 25 m2 (with 300 mm insulation) would need 25 X 1.3 = 33 bags (rounded up)
