Once a pitched roof is covered, it is difficult to inspect the PIR board joints or the junctions with adjoining insulation. Agree an inspection point with the roofer before work starts. Have the roof section and the eaves, ridge and roof window details ready, then check them in turn before the next layer conceals them. This checklist helps the client record how the design was built and direct questions to the right person. It does not replace the fixing design or the instructions for the selected system.

When façade works stop before winter, each elevation may be at a different stage. Boards beside the entrance may still be exposed while the garden wall already has a reinforced base coat. For each wall, record the last layer installed, locations open at the top and the protection agreed for that system. The contractor can use this record to prepare the building for the break and decide where to resume in spring. A marked-up elevation makes it easy to find the areas that need another inspection.

The PIR properties stated in documentation do not replace checking the material delivered to site. Before installation, confirm its identification, condition and storage arrangements against the instructions for that product. Damage, moisture or an unapproved repair needs resolution, not concealment beneath another layer. This guide follows the material from package receipt to recording work before it becomes hidden. It separates delivery checks, protection while waiting and inspection before enclosure. It gives no universal stacking height or exposure period: those conditions depend on the particular product and assembly. The aim is to keep boards identifiable and distinguish material accepted for use from a batch awaiting a decision.

An internal ceiling can separate a heated or climate-controlled room from the roof void. In a cattle shed or warehouse, its appearance is only one consideration. Choose insulation, facings, supports and wall junctions to suit the space. PIR boards help keep the build-up thin. For a durable ceiling, plan how to control moisture, clean the lining and reach services above it. This is an internal ceiling, distinct from decorative soffit cladding beneath the eaves outside. In a farm building, the ceiling can form the room’s thermal boundary. The design must define the height and use of the void above: moving that boundary changes the room volume, ventilation and service routes.

A loft fit-out starts well before the first plasterboard goes up. Inspect the roof, plan the insulation and establish how the layers will be made airtight. Framing, lining and jointing follow. PIR boards can reduce the insulation thickness needed, but form only part of the lining system. The materials must work together around windows, walls and services. Check the roof covering, flashings, window junctions and timbers before concealing them. Repair leaks and timber damage first. When converting a loft, establish the load capacity of the floor and the applicable approval requirements. Partitions, flooring and furnishings add loads. Adequate headroom alone does not make a loft suitable for habitation.