PIR boards in commercial and industrial buildings. From insulation core to finished roof or wall

Polyurethane foam describes a family of materials. It does not identify the facing on a particular board. Quotations that use the same generic term can therefore cover different products. Use the same identification checklist for purchasing and for goods received so site staff can match the delivered boards to the specification.

Identify which face should be laid against the substrate, particularly where the two sides differ. Sanding or stripping a facing requires explicit approval for the intended use. Damage can alter the board’s properties or prevent installation of the next layer.

An unsuitable facing on a large roof can affect an entire work area. Confirm compatibility with the adhesive or waterproofing before the pallets arrive. Record the installation conditions for the chosen combination. If a component changes, recheck its interface with the others before the next trade starts.

In a refurbishment, the available upstand above the finished roof may limit insulation thickness. For a homogeneous layer, the thickness needed to reach a specified thermal resistance R equals R multiplied by thermal conductivity λ. Use the declared values of the two boards under consideration. Plot the resulting difference in thickness on the parapet section. The designation PIR alone gives no basis for assuming that only half the space is needed.

A thinner layer can reduce material volume for the same roof area. Delivery numbers still depend on how the boards are packed and the usable capacity of each vehicle. Installation time depends on board size, cutting and access to the workface. Use the delivery and installation plans to estimate any saving in transport or labour.

Mark the strip beside the doors, the roof over the heated area and the floor under the racking separately on the building plan. For each zone, record the support, the layer to be installed over the board and any source of moisture. Two boards of the same thickness and conductivity may still need different facings or compressive performance.

Equipment zones, service routes and undisturbed areas of roof need separate load assessments. A single declared CS value for compressive stress cannot describe them all. Show how loads reach the structure and where load-spreading components are needed. Select the PIR boards for their assigned function so that structural loads do not inadvertently bear on the insulation.

Use expanding foam in a gap only where the specified detail permits it. It cannot replace a missing piece of board or proper support. Check that jointing materials are compatible with the facings and service conditions. Repair a substantial defect before applying tape over the joint.

Show work limits, cuts and joints on the board layout. The crew then has agreed stopping points for each phase of the job. Protect the edges exposed between phases using the specified method. A level finished surface gives little information about the joint between work completed on different days.

At delivery, photograph the pallet label beside the corresponding order reference. Read the facing type and thickness, then locate that variant in the declaration and installation instructions. If a property required by the design is marked NPD, the manufacturer has declared no performance for it. Resolve that discrepancy before the batch is installed.

Record work that will be concealed, particularly where later access would be expensive. Include the location reference in photographs. At inspection, compare the material, substrate and joint layout with the design. A CE document alone cannot record how the insulation was installed. Keep the product declaration and installation evidence together for assessment of the finished assembly.

Large uninterrupted areas suit full-size boards. At perimeters and around penetrations, cutting can account for a significant part of the work. Select board formats to reduce offcuts while maintaining the specified joint layout and fixings.

Match each delivery batch to a work area and keep the boards identifiable after unpacking. Schedule inspection before the next layer conceals the insulation. This gives the owner a record of the board, fixing arrangement and installed location for each phase.