This course will provide you with both practical and background theory for installing Internal Wall Insulation (IWI) (including room in roof). IWI is a useful solution for insulating new and older dwellings from the inside. Essentially, it's an innovative dry lining system developed by varying insulation specialists. It can significantly improve the thermal U-Value of walls. IWI systems are designed specifically for applications where external or cavity wall insulation is simply not a viable option. Many systems are easy-to-install, and a cost effective alternative for renovating, and insulating external walls from the inside.