The thickness of wall insulation required will be dependent on the U-values you wish to achieve. Installing internal insulation impacts on the floor space of the internal rooms, so careful detailing can help minimise thickness of insulation to minimise the impact on floor space whilst achieving excellent thermal performance. See the below table for U-value results based on the wall construction shown. For project specific U-values use our free U-value calculator.
Required thickness of Quinn Therm QL - Kraft:
Cavity wall with internal drylining
|Quinn Therm QL - Kraft||Partial fill cavity insulation (mm)|
|Thickness (mm)||U-value (W/m2K)|
U-value results above based upon wall construction shown:
103mm brick outer leaf; 40 - 50mm low emissivity residual cavity; Quinn Therm QW; 100mm concrete block (conductivity as shown); 12mm plaster with dry wall adhesive; Quinn Therm QL-Kraft insulated plasterboard on plaster dabs. Calculations performed to BS EN ISO 6946, taking account of repeatingthermal bridges.
Cavity Wall Insulation
Solid Wall Insulation
Dormer Wall Insulation