termPIR AL in a large building. How to assess a lightweight insulation layer

Measure several doorways even if the drawing shows identical dimensions. The section where the substrate is highest will show the least available depth. Mark the finish thickness on both sides of the door and show where the insulation meets the wall.

Use a trial area to check whether the specified thickness fits at the jamb without raising the finished threshold. Record the measured level and photograph the exposed joint. Repeat the detail at openings with the same measurements and build-up.

CS(10/Y)120 refers to the compressive stress at 10% deformation or the compressive strength if failure occurs earlier. The manufacturer declares at least 120 kPa. For a 100 mm board, 10% deformation would be 10 mm. The acceptable settlement of the finished floor is a separate design criterion.

To assess an equipment support, establish the force on one foot, its contact area and the duration of loading. The designer determines how far the layer above the PIR spreads the force and whether creep must be included. Fire performance requires a separate check. The exposed board has reaction-to-fire class F at 20–49 mm and E at 50–250 mm.

The termPIR AL data sheet gives λD = 0.022 W/(m·K) for thicknesses from 20 to 250 mm. If 100 mm is available, divide 0.100 m by 0.022 W/(m·K). The homogeneous layer gives a calculated resistance of about 4.55 m²·K/W. For the declared resistance of the thickness you intend to order, use the product documentation.

Mark where the 100 mm layer ends at the threshold. If the insulation tapers or stops at the jamb, the result for the centre of the floor does not describe that junction. Include the adjoining wall detail when assessing heat loss.

In the edge schedule, FIT means a square edge, LAP a rebated edge and TAG a tongue-and-groove joint. Mark which side of each cut board will retain its factory edge in the last row. This determines how it meets the previous row.

Dry-lay boards where the wall changes direction. If the final strip is too narrow, try shifting the starting line to obtain a wider, fully supported piece. Agree how the cut edge will be closed before cutting boards for the remaining bays.

The laminate limits vapour diffusion through the intact face of the board. At a pipe, the installer needs to know which layer provides vapour control in the specified build-up and where it connects to the penetration.

Sequence the work so that the full circumference of the pipe remains accessible after it has been fixed. Before covering the floor, check the seal all the way round against the system detail. A photograph labelled with the grid reference will identify the penetration later.

Compare the 600 × 1200 and 1200 × 2400 mm formats on a plan of the same area. For profiled edges, establish the effective cover per board. Check the delivery route from the unloading point to the room with the narrowest entrance.

Count whole boards by row and list the pieces needed at doors, columns and perimeter walls separately. Credit an offcut only where its dimensions and remaining edge suit another marked position. Group the order by thickness, format and edge profile before rounding up to whole packs of each variant.