Warm roofs & room-in-roof
Rigid board insulation
High-performance PIR board for warm roofs, room-in-roof conversions and sloping ceilings , cut tight, fitted between and under the rafters, and finished ready for plasterboard.
The service
More performance from less thickness
Mineral wool works beautifully on a loft floor, but when you’re insulating a sloping ceiling or turning a roof space into a room, depth is the thing you don’t have. Rigid PIR board gives you far more thermal performance per millimetre, which is why it’s the go-to for warm roofs, dormers and room-in-roof conversions.
Fitting it well is all in the cutting. Boards are measured and cut tight between the rafters, foil-taped at the joints and, where headroom allows, a second layer is run underneath to break the cold bridge through the timber. A ventilation gap is maintained above the board so the roof deck can still dry out.
We commonly fit rigid board after a spray foam removal, where the customer wants the warm-roof performance the foam was sold for , but done in a way a surveyor is happy with and that can be inspected in future.
Recent rigid board jobs
Roofs and walls we have boarded out
Which one do I need?
Rigid board or mineral wool?
It comes down to what the space is for. We’ll tell you honestly at the quote , and often the answer is both, in different parts of the roof.
Choose rigid board when...
- The loft is becoming a room
- You’re insulating a sloping ceiling
- Headroom or depth is tight
Choose mineral wool when...
- The loft stays a cold roof space
- You’re topping up the loft floor
- Budget matters more than depth
