"If there's one part of a self build or renovation that's easy to underestimate, it's insulation. Most of us know it's essential for keeping the house warm and reducing energy bills, but the reality is that insulation isn't just about stuffing some material into walls or roofs and calling it a day. Done wrongly, it can lead to damp, drafts, mould, and a home that's far less comfortable than it should be."
"Too often, self builders rush in and start insulating without checking if the application (cavity walls, timber frames, solid masonry walls etc) can be insulated. For example, using cavity wall insulation on a timber frame building, or spraying foam between the rafters of a roof space. Without proper ventilation, moisture can get trapped causing rot, and insulation that gets wet or suffers thermal bypass will perform far below expectations, wasting money rather than saving it."
Insulation is crucial for warmth and lower energy bills but requires correct design and installation to avoid damp, drafts, mould, and poor comfort. Buildings require suitability checks before insulating because different constructions (cavity walls, timber frames, solid masonry) need different approaches; inappropriate applications (like cavity wall insulation on timber frames) can trap moisture and rot. Proper ventilation must be maintained to prevent moisture build-up and thermal bypass. Professional surveys or energy assessments by qualified surveyors or designers should identify problems and recommend appropriate insulation types and methods for lofts, walls, floors, and roofs.
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