Panel build-ups and U-values
SIP panel specifications, thicknesses and calculated U-values
Compare the SIP panel thicknesses we manufacture, from lightweight outbuilding panels to high-performance 222mm panels. Each page shows the PIR core, Sterling OSB/3 facings, calculated U-value and typical use.
Choose the panel thickness
Thicker panels generally give lower U-values. For habitable buildings or Building Control projects, use these pages as a technical starting point and confirm the final specification with your designer, engineer or Building Control.
72mm
Standard performanceSIP panel
0.383
W/m²K U-value
50mm PIR core with 2 × 11mm Sterling OSB/3 facings. Lightweight garden pod and outbuilding panel.
97mm
Standard performanceSIP panel
0.267
W/m²K U-value
75mm PIR core with 2 × 11mm Sterling OSB/3 facings. Warm-season garden studio panel.
122mm
Good performanceSIP panel
0.205
W/m²K U-value
100mm PIR core with 2 × 11mm Sterling OSB/3 facings. Our most popular garden-room and floor panel.
172mm
Exceptional performanceSIP panel
0.140
W/m²K U-value
150mm PIR core with 2 × 11mm Sterling OSB/3 facings. Common route for habitable projects.
222mm
Exceptional performanceSIP panel
0.106
W/m²K U-value
200mm PIR core with 2 × 11mm Sterling OSB/3 facings. Maximum thermal performance.