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Case study · St Andrews, Fife · 2026

Wall and floor insulation in St Andrews

A timber-framed extension in St Andrews, with PIR boards cut between every stud and floor joist, joints taped and a foil vapour layer over the top, ready for plasterboard.

Quinn Therm PIR boards fitted between the studs of a timber-framed wall, St Andrews

The job

A timber-framed extension and renovation in St Andrews, next to the original blockwork of the house. The walls and floor needed insulating before any linings went on.

  1. Boards between the studs

    Quinn Therm PIR boards cut tight between every stud. A snug fit matters more than the board: a few millimetres of gap all the way round is a lot of heat over a whole wall.

  2. Tape every joint

    Foil tape across all the board joints and edges to make the wall airtight.

  3. Vapour layer

    A foil vapour control layer over the boards, so warm, moist air from the room can't get into the frame and condense.

  4. Battens and floor

    Service battens over the top for cables and plasterboard, and the same PIR boards fitted between the floor joists.

Wall and floor insulated with PIR boards between the timbers, St Andrews

Floor joists filled with PIR, walls battened ready for board.

More from the job

Insulation boards taped and a foil vapour layer going on, St Andrews
Insulation boards taped and a foil vapour layer going on, St Andrews
PIR boards on the wall with service battens fixed over, St Andrews
PIR boards on the wall with service battens fixed over, St Andrews

Fife

St Andrews and the East Neuk have a lot of older stone houses being extended and modernised. We insulate the new parts to modern standards and advise on the old parts too. Our Fife page · Internal wall insulation in Fife · Underfloor insulation in Fife

Extensions and renovations

Builders and homeowners use us for the insulation stage because we're joiners: we fit round the frame, the services and the openings without holding the job up. Call 0800 069 9339.

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