Kingspan Therma TR27 on industrial flat roofs

The field section should identify every interface from the structural deck to the waterproofing. At each interface record the fixing or bonding method and the materials being joined. Where the roof has more than one substrate, detail the transitions separately.

The description “glass tissue faced PIR” is insufficient to specify a substitute. Check the precise TR27 variant, membrane, adhesive and any primer against the system documentation. If one component changes, obtain confirmation for the revised combination.

Trace the route from the access hatch to each item of plant. Mark turns and standing areas beside service panels that open. The access detail should specify membrane protection and how pressure is distributed to the insulation beneath it.

The variant described in the Polish catalogue is listed at a minimum of 120 kPa at 10% deformation, with reaction-to-fire class E. Long-term loading under a foot and the fire classification of the roof assembly require separate checks. Match the delivery identification to the document used for the design values.

In the Polish schedule, the 100 mm option has λ = 0.027 W/(m·K) and thermal resistance of 3.70 m²K/W. At 120 mm the respective figures are 0.026 W/(m·K) and 4.60 m²K/W. The comparison therefore uses a different conductivity for each thickness.

The difference in declared resistance between these entries is 0.90 m²K/W. Record thickness and the document reference for the relevant market beside each result. Calculate the U-value for the complete roof with the specified layers and fixings.

Set out courses of 1200 × 600 mm boards from the surveyed parapet line. If the building edge is not parallel to the board grid, the last strip may vary in width along its length. Take several measurements before cutting a batch of identical pieces.

Confirm the edge geometry and coverage with the supplier. Cutting off a profiled edge leaves a straight face. On the first section, check the support under that piece and the insulation junction with the vertical parapet face.

Set out an area the roofers can inspect and waterproof in the forecast weather. Before bonding, check cleanliness, dryness and facing condition against the system instructions. Mark damage on the field sketch and agree how it will be rectified before concealment.

Record the adhesive used, required application conditions and start time. Where an adhesion test is specified, use the method and acceptance criteria for that system. Check the material references on the next delivery before releasing the following bay.

Compare quotations for the same area, thermal resistance and scope of finish. For a bonded system, include adhesive consumption and preparation of the substrate. For mechanical fixing, use the fastener count and type in the fixing schedule as pricing inputs.

Alongside the rate per square metre, state the lengths of perimeter junctions and the area of maintenance walkways. If the client later adds equipment, its access route, protection and base details can be priced without remeasuring the whole roof.