Professional installation, for example by a National Insulation Association member, is vital when retrofitting CWI
For most people undertaking a major renovation project, upgrading the house’s energy efficiency will be a key goal. To get this right, you need to address each of the core components of the external envelope (floors, walls, windows and roof) and look at how their performance could be improved.
In this article I’ll explore the main options for upgrading each thermal element, but it’s important to take a holistic, whole-house approach so that everything works together. You’ll need to account for the risks involved in altering a property’s structural fabric (see the box, top right) and be careful to avoid cold spots (which can cause condensation), along with making the necessary adjustments to heating systems and ensuring there’s adequate ventilation.