Kingspan Therma TF70 in ancillary rooms: floor levels and loads

Use the specified finished floor level as the datum. Mark it in the corridor and adjoining rooms. Even where the finished level is the same, tiles and adhesive leave a different depth for the layers below than a thin resilient finish.

Draw the two sections side by side at the doorway. For underfloor heating, check pipe position and the specified screed cover. If the layers exceed the available depth, revise the detail before ordering the boards.

Mark cabinet supports, rack feet and equipment delivery routes on the floor plan. The same weight can bear on a full base or on a few small feet. For each case, the designer needs support reactions, contact dimensions and load duration.

The TF70 catalogue gives a minimum compressive stress of 120 kPa at 10% deformation and reaction-to-fire class E. Permissible movement for the screed and a brittle finish follows from the floor design. For heavy equipment, assess the whole build-up beneath the actual support.

At a declared λ of 0.022 W/(m·K), the manufacturer gives thermal resistances of 3.60 m²K/W for the 80 mm board and 4.50 m²K/W for 100 mm. An extra 20 mm therefore adds 0.90 m²K/W to the declared resistance of the insulation.

For a ground-bearing floor, building heat loss also depends on the geometry and perimeter of the heated area. For rooms along the façade, show how TF70 meets the wall and plinth insulation. Include these details in the heat-loss calculation.

For 1200 × 600 mm square-edged boards, set out courses from the doorway to the opposite wall. Before laying, agree how uneven areas, chases and service crossings will be treated so each board has the support required by the design.

Check the first cut piece around a pipe group and the final strip in the corner. A rocking board identifies an area where the substrate needs reinspection. Correcting the cause before the separating layer is laid avoids lifting completed sections.

The board has a multilayer facing containing aluminium on both sides. At the wall, show the damp-proof layer, separating layer and perimeter strip where specified. Each has its own termination at doors and pipes.

Before screeding, photograph service penetrations and changes in thickness. In heated rooms record whether the photographs were taken before or after pipe installation. A record indexed by room helps locate concealed details later.

A full board in this format covers 0.72 m². Total the areas by thickness, then allow for cuts at door recesses and columns. Allocate a leftover strip to the next room only where its width fits the board layout.

Include substrate levelling, cutting, protection and handover to the next crew in the scope of work. When signing off a corridor with several doors, check levels at every threshold. Each doorway joins a particular pair of floor build-ups.