Closed panel systemsSigma® II Build System Closed panel solutions offer a higher level of prefabrication, reducing process, time and waste on site, while offering higher levels of assured performance. Oue newest addition is the award winning BBA certified Sigma®II Build System. This provides a range of external wall U-values from 0.25 - 0.10, as well as very low levels of airtightness and thermal bridging, demanded from a high performance fabric solution. |