SOPREMA EFYOS BLUE PIR foam board, 50 mm, 120 × 60 cm, second grade

Limited space for insulation need not rule out refurbishment. Rigid PIR boards provide thermal protection in a compact layer. Different facings and edge finishes let you select boards for different parts of the building and fit them to the geometry of existing elements.

PIR conducts less heat than many conventional insulation materials. It can often deliver the required thermal performance in a thinner layer, useful under loft slopes and where finished floor heights are fixed. It also helps where insulation meets doors, stairs or existing flashings. Determine the final thickness from the design calculation and the declared properties of the selected board.

The board holds its shape during measurement, cutting and laying. Flat surfaces provide an even layer for subsequent work. Machined edges help align adjacent boards and limit open joints. The low weight helps in lofts and other areas with restricted access. Plan large pieces for open areas and smaller pieces at changes of direction. Consistent thickness avoids abrupt steps at adjoining surfaces.

Appropriate PIR boards are used in pitched and flat roofs, walls and floors. Facings and mechanical properties determine suitability. Under floors, the board must withstand the expected loads. In roofs, it must work with the adjacent layers. Different variants can achieve comparable thermal protection throughout a building while meeting the detailing needs of each part. This is useful in a whole-house refurbishment.

PIR boards help carry insulation through more difficult junctions. Select thicknesses to smooth the transition between an existing wall, roof slope and ceiling. Above-rafter insulation encloses the roof structure from outside, leaving more flexibility indoors. Rigid floor insulation provides a defined level for subsequent work. The mostly closed-cell foam limits water uptake, while the assembly still needs the specified waterproofing and vapour control measures.

SteelProfil offers PIR insulation for tight details and large areas, with a range of boards available from stock. Compare first- and second-grade lots, current offers and formats suited to the element you are renovating.