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Eurothane Silver on a large roof. Insulation, fixings and load planning

PIR insulation

At a glance

A roof plan for Eurothane Silver should show what holds the covering and insulation against wind uplift and how equipment loads reach the structure. Corners, edges and equipment supports deserve particular attention. A single figure for the PIR board cannot determine the fixing design in these zones. Before ordering, combine the wind-zone drawing with a section through the deck, vapour control layer, insulation and membrane. Schedule board formats separately for open areas and narrow spaces around equipment housings. The first completed bay can then be inspected for both the board layout and the connections between layers.

Recticel Eurothane Silver PIR insulation board with exposed core and facing

Trace the load path

For a mechanically fixed roof, identify the element receiving the fastener. On a profiled steel deck, both the profile geometry and fixing position matter. The designer specifies the number of fasteners for the wind uplift in each zone.

For a bonded roof, check the adhesive against both surfaces being joined. A ballasted design must also account for ballast weight and distribution. Confirm the selected method for the complete build-up to be installed.

Reading the declaration for each thickness

Schedule the 20 mm board separately from versions 30 mm and thicker. The data for these versions give CS120 and CS150 respectively. Check the delivery designation before using either figure in an assessment of equipment bases.

For the fire assessment, distinguish class F for the standalone board from 30 mm from B-s2,d0 for a specified end use. Check the scope of the declaration separately for 20 mm. Retain the substrate and thickness conditions with the classification.

Thermal checks at the parapet

Eurothane Silver has a declared conductivity of 0.022 W/(m·K). A 120 mm board, for example, has a declared resistance of 5.45 m²·K/W. For the roof U-value, include the full construction and the applicable fixing corrections.

Mark the finished membrane level at the parapet, allowing for the falls. Adding insulation changes the available upstand height. Carry the same revision through to rooflight kerbs and abutments.

Using two board sizes on one roof

A 600 × 1200 mm board has a gross area of 0.72 m², compared with 2.88 m² for 2400 × 1200 mm. The larger format has four times the gross area. Check cover dimensions and edge profile for the actual delivery.

Where equipment kerbs are close together, draw the cut pieces and the roofer’s access route. List the 20 mm version, specified in the smaller format, separately. Labelling packs by zone helps direct deliveries to the correct roof area.

Closing the day’s work

Before opening the next bay, establish where the temporary membrane seal will go. Runoff from the finished area must be kept out from beneath exposed boards. Mark a route to a functioning outlet on the phasing plan.

Detail two connections at a pipe penetration. One seals the vapour control layer at deck level and the other seals the waterproofing around the pipe. The facing on each PIR board stops at its edge.

Checks before starting the next bay

In the first bay, compare board orientation, joint layout and fixing method with the drawings. Record batch numbers and photograph areas the membrane will conceal. Recheck the fixing detail wherever the deck changes.

Price insulation area by thickness, fixings by roof zone and penetrations by quantity. With these items separated, a change to service routing can be costed without remeasuring the whole roof.