Where can XPS be used in an industrial building clad with sandwich panels?

A factory-made sandwich panel has a core and facings. The cladding design specifies its span, fixings and joint seals. A separate XPS board serves as thermal insulation within the assembly.

Extruded polystyrene can bridge the junction between the cladding and the structure at ground level. Design the two together. Even a well-insulated wall panel leaves a thermal bridge if it ends above a wide strip of uninsulated plinth. XPS at the junction can close that gap while retaining the selected cladding system.

In a heated or refrigerated hall, significant heat exchange can take place through the floor. XPS beneath the structural slab can provide continuous insulation where moisture and compressive loads occur together. Select its properties for the racking, machinery and traffic in each part of the building.

The low weight of XPS helps installers cover large areas, while regular board sizes make joint positions easier to control. The boards need even support and suitable long-term deformation properties. CS describes short-term compressive behaviour. For a permanent load, assess the insulation together with the slab that spreads the load.

Several materials and levels meet at the foot of the wall. XPS can reduce heat loss at the base beam or foundation wall. Coordinate its thickness and upper edge with the bottom of the cladding. The detail also needs joint seals, drainage and impact protection.

Protect exposed XPS wherever there is traffic or direct sunlight. If the plinth will be rendered, select a board and render system suitable for one another. The smooth face of a board used under a slab may be unsuitable for the specified mortar. Identify the required surface finish on the section.

At the entrance, the internal floor meets the external pavement. Even with XPS on both sides, the threshold needs adequate support and a route for runoff. Detail the thermal insulation, air seal and waterproofing separately so each remains continuous where required.

XPS can be cut to follow the threshold outline. A loadbearing threshold component needs a separate structural check before any substitution. Vehicle traffic and door fixings introduce loads very different from pedestrian traffic. Agree the detail with the door supplier and flooring contractor before setting the levels.

XPS is also used on flat roofs, particularly inverted roofs. Before specifying it for a hall, establish the loadbearing structure, waterproofing, separation layers and means of securing boards against movement. Include the weight of any ballast in the roof design.

Where a hall already has factory-made roof panels, assess any modification as part of that roof system. In a suitable inverted roof, XPS can protect the waterproofing and withstand moisture exposure. The choice depends on the structure, how the roof is used and how it will be maintained.

XPS producers include Ravago, Austrotherm and swisspor. Their ranges include different surfaces, edges and performance classes. Order the floor boards separately from the grade used at the plinth or another junction. A generic trade name gives too little information to identify the product.

Check thermal conductivity, relevant water absorption data, compressive stress, creep and reaction to fire. XPS is combustible. Its classification describes the product, while protective layers and junctions must meet the project’s requirements for the assembly. Precise specifications make offers for the same function easier to compare.

Different trades often install the floor, cladding, gates and foundation insulation. Agree common reference levels and the order of inspections. If a planned fixing conflicts with the XPS at an edge, resolve it on the drawing while the floor and cladding details can still be adjusted.

At handover, trace the insulation from below the slab, up the plinth and into the wall panel. Check where it changes material and who inspected each junction. This final check brings together the moisture and load requirements of the ground-level insulation and the thermal performance of the cladding.