Rigid XPS insulation – 150 mm board, 1250 × 600 mm

Foundation insulation has to cope with moisture, ground contact and loads from other layers. These conditions differ from those on a dry internal wall. SteelProfil offers extruded polystyrene boards for locations where low water absorption and the correct compressive strength both matter.

The closed cells of XPS restrict water uptake. Boards are widely used at foundation walls, basements and plinths to continue the insulating layer where the building meets the ground. Choose a grade suitable for the exposure and provide a separate waterproofing layer. Finish the plinth with a system suited to the build-up, façade and entrance details.

In an older house, XPS can insulate below-ground walls exposed during renovation. Connect it to the façade insulation to reduce gaps at the transition. In a new building the connection can be made during foundation work. In either case, prepare the surface, keep the insulating layer continuous and check that materials in contact with the board are compatible.

Suitable grades can be used beneath floors and on inverted roofs. Use the declared compressive properties to select a board for the loads it will carry. A residential floor and a heavily used technical area may require different grades. Establish the use of the surface before ordering.

Rigid boards give the insulating layer an even surface. Shaped edges on selected products help align joints. Plan cuts at corners and service penetrations before laying. This helps when working in an excavation or a room with an irregular floor plan. Choosing a suitable format can save time and reduce unused offcuts.

SteelProfil’s insulation range includes first- and second-grade material. Selected XPS boards are available from stock for earthworks and floor preparation. For second-grade batches, assess their properties against the intended use. We can help match the price and the condition of the batch to the planned layers.

Have the foundation insulation ready before backfilling. Check board quantities, compatible fixing materials and protection for the layers. Compare current SteelProfil promotions and prices for the complete ground-contact area. Ordering the set together can spare a small job several separate deliveries.

If a section drawing of your foundation or floor is available, use it to identify the required thickness and performance. SteelProfil can compare available boards and help calculate the quantity. Where moisture and pressure matter, choose and inspect the insulating layer while the work is still accessible.