termPIR WS on an industrial roof. Matching the insulation and waterproofing

Name the material that will touch the termPIR WS in the roof section. If the membrane is to be bonded, locate the WS facing in the system instructions and check the specified surface preparation. Keep this information with the order.

For a mechanically fixed roof, show which layer will receive the fasteners. The fixing layout and accessories should follow the design for the roof and its wind zones. Give the contractor that drawing before pallets are positioned.

Draw the route from the access hatch to the equipment and outline each foot. Foot traffic and a permanently loaded support require separate assessments of load distribution. The board’s CS(10/Y)120 designation refers to its compression test.

Identify the deck, insulation and covering in the fire documentation for the roof. The uninstalled WS board has reaction-to-fire class F at 20–49 mm and E at 50–250 mm. Check the classification applicable to the finished roof assembly.

WS boards from 20 mm up to but excluding 80 mm have a declared conductivity of 0.027 W/(m·K). It is 0.026 from 80 mm up to but excluding 120 mm and 0.025 W/(m·K) from 120 to 250 mm inclusive. Match each value to the corresponding board thickness on the plan.

If the board is 70 mm at the parapet and 140 mm in the roof field, use 0.027 W/(m·K) for the first thickness and 0.025 for the second. Also check insulation continuity and the available waterproofing upstand height on the parapet detail.

Locate the outlet flange before cutting the final row. Dry-fit the pieces and check that the deck supports them up to the edge shown on the detail. Allow space around the outlet to form the waterproofing connection.

The square or profiled board edge controls the joints between full boards. A circular outlet creates a cut edge. Check the stability of the cut pieces and the fall towards the outlet before the roofer covers the area.

Size each day’s work area so the crew has time to form a temporary weather seal at its open edge. Mark the direction of run-off from the adjoining roof and an alternative route for installation crews.

Protect the glass fleece from rain. After a break, inspect exposed boards and any edge where water could have entered beneath the insulation. Assess the material and agree how to deal with any affected area before covering it.

Include the roof area, number of outlets and penetrations, and linear metres of parapet in the enquiry. Specify the board format, effective cover of the edge profile and the thicknesses required in each area.

When comparing quotations, check who has allowed for deck preparation, adhesive or fasteners and temporary seals during breaks. Give outlet detailing its own line item so that the total covers a finished roof that can drain.