SIPs Self-Build House Kits​
Designed
Manufactured
Delivered
Erected
Nationwide
07577 791 936
Roof U-Value Calculations
Roof Type 1 - Description:
12mm Roof Tiles, 50mm ventilated air layer, Protect VP400 Plus LR Membrane, SIP at specified thickness, Protect VC Foil Ultra Insulating A VCL, 25mm Service void, 12.5mm Plasterboard
Condensation Calculation
SIP Thickness
​
219mm
​
194mm
​
169mm
​
144mm
​
​
Total Roof Thickness
​
319mm
​
294mm
​
269mm
​
244mm
​
​
U-Value
​
0.13W/m²K
​
0.15W/m²K
​
0.17W/m²K
​
0.20W/m²K
​
​
U-Value
Calculation
Roof Type 2 - Description:
12mm Roof Tiles, 50mm ventilated air layer, Protect VP400 Plus LR Membrane, SIP at specified thickness, Protect VC Foil Ultra Insulating A VCL, 25mm Service void, 50mm Gyproc Thermaline Super
U-Value Calculation
SIP Thickness
​
219mm
​
194mm
​
169mm
​
144mm
​
​
Total Roof Thickness
​
356mm
​
331mm
​
306mm
​
281mm
​
​
U-Value
​
0.10W/m²K
​
0.11W/m²K
​
0.12W/m²K
​
0.14W/m²K
​
​
Condensation Calculation
Flat Green Roof - Description:
Green roof covering, 19mm ply, 50mm ventilated air layer, Protect VP400 Plus LR Membrane, SIP at specified thickness, Protect VC Foil Ultra Insulating A VCL, 25mm Service void, 12.5mm Plasterboard
SIP Thickness
​
219mm
​
194mm
​
Total Roof Thickness
​
348mm
​
323mm
U-Value
​
0.14W/m²K
​
0.16W/m²K
​
Condensation
Calculation
U-Value
Calculation
Flat Green Roof - Description:
Green roof covering, 19mm ply, 50mm ventilated air layer, Protect VP400 Plus LR Membrane, SIP at specified thickness, Protect VC Foil Ultra Insulating A VCL, 25mm Service void, 50mm Gyproc Thermaline Super
SIP Thickness
​
219mm
​
194mm
​
Total Roof Thickness
​
385mm
​
360mm
U-Value
​
0.11W/m²K
​
0.11W/m²K
​
U-Value Calculation
Condensation Calculation
Flat EPDM Roof - Description:
EPDM Rubber roof covering, 19mm ply, 50mm ventilated air layer, Protect VP400 Plus LR Membrane, SIP at specified thickness, Protect VC Foil Ultra Insulating A VCL, 25mm Service void, 12.5mm Plasterboard
SIP Thickness
​
219mm
​
194mm
​
Total Roof Thickness
​
324mm
​
299mm
U-Value
​
0.14W/m²K
​
0.16W/m²K
​
Condensation Calculation
U-Value Calculation
Flat EPDM Roof - Description:
EPDM Rubber roof covering, 19mm ply, 50mm ventilated air layer, Protect VP400 Plus LR Membrane, SIP at specified thickness, Protect VC Foil Ultra Insulating A VCL, 25mm Service void, 50mm Gyproc Thermaline Super
SIP Thickness
​
219mm
​
194mm
​
Total Roof Thickness
​
361mm
​
336mm
U-Value
​
0.11W/m²K
​
0.11W/m²K
​
U-Value Calculation
Condensation Calculation