Building extra living areas within the attic is a great way to maximise the space within a house without increasing the footprint.
Metac is a glass mineral wool ‘slab on a roll’ insulation for pitched roof rafter applications which delivers a range of benefits for the housebuilder, installer and home owner. As well as excellent thermal performance, Metac provides a proven acoustic benefit by helping reduce external noise from traffic, trains, planes and weather by up to 49dB. It also offers a more cost effective and easy to install solution than many alternative insulation materials.
Building Regulations
| Country | Building Regulation | New Dwellings - Minimum standard for U-Values | Renovation - Minimum standard for U-Values |
|---|---|---|---|
| England | New Dwellings – Part L | 0.20 W/m2K | 0.18 W/m2k Conversion 0.18 W/m2k Extension |
| Wales | New Dwellings – Part L | 0.15 W/m2K | 0.18 W/m2K Conversion 0.15 W/m2K Extension |
| Scotland | New Dwellings – Section 6 | 0.15 W/m2K | 0.25 W/m2K Conversion 0.18/0.13 W/m2K Extension* |
* Lower U-value is required when existing wall and roof U-values are less than 0.70 and 0.25 respectively
Isover Solutions
The table below gives you some examples of how Metac can be used to achieve a defined U-value. For additional options, or for further guidance, please contact our Technical Support Team on 0115 945 1143| U-value achieved (W/m²k)* | Insulation between rafters @ 600m centres | Insulation below rafters |
|---|---|---|
| 0.19 | 125mm Metac | 53mm Gyproc ThermaLine PIR |
| 0.18 | 125mm Metac | 63mm Gyproc ThermaLine PIR |
| 0.17 | 175mm Metac | 50mm Metac between counterbattens plus 12.5mm Gyproc WallBoard |
| 0.16 | 175mm Metac | 53mm Gyproc ThermaLine PIR |
| 0.15 | 175mm Metac | 63mm Gyproc ThermaLine PIR |
| 0.14 | 200mm Metac | 53mm Gyproc ThermaLine PIR |
| 0.12 | 200mm Metac | 78mm Gyproc ThermaLine PIR |
* Based on 50mm wide rafters
