Is EPS 200 suitable beneath a heavily loaded garage floor?

EPS 200 denotes a compressive stress of at least 200 kPa at 10% deformation in the CS(10) test. For a 100 mm layer, 10% would mean a 10 mm reduction in thickness. The garage floor design needs a much closer assessment of permissible movement and the behaviour of the whole construction.

Cars driving through, a heavy vehicle parked for long periods and a vehicle lift impose different loads. Include wheel forces and the reactions at equipment feet. Mark braking, turning and entrance zones. Storage cabinets, machinery and stands for heavy parts can also impose concentrated loads.

Design lift supports and anchors separately. A conventional floating floor over EPS cannot be assumed to provide a suitable machine foundation. Obtain forces and fastening details from the lift supplier. The designer can then determine whether a separate foundation, local slab reinforcement or another detail is needed.

The concrete distributes loads over the insulation. Its capacity depends on thickness, reinforcement, joint spacing and support conditions. Loads near the edge of a slab bay may be more demanding than those at its centre. Specifying stronger EPS cannot compensate for an inadequate concrete slab.

Prepare the sub-base for the design loads. Depressions, loose offcuts and construction debris can leave boards bearing unevenly. Inspect the supporting layers before laying EPS. Correcting a poor base may achieve more than choosing the next insulation grade without checking the design.

Parked vehicles load the floor for a limited period, while equipment may remain in place permanently. Insulation can gradually deform under sustained pressure. Assess this creep using data for the exact board and service period. Include permissible floor settlement and the sensitivity of the finish to movement.

Look for declared creep data (CC) or documented design rules for assigning sustained loads. An undeclared value leaves deformation unknown. Data from another EPS 200 product may differ. Obtain the relevant technical information before approving a substitution.

Vehicles bring water and dirt into a garage. The floor build-up and its seals protect the EPS from above. A ground-bearing floor also needs protection from ground moisture. A high compressive strength alone gives no assurance of enhanced water resistance and cannot provide waterproofing.

For underfloor heating, also verify the thermal properties and permitted use of the boards. Conductivity describes the material. Floor heat loss depends on geometry and ground conditions too. Coordinate thickness with the threshold, floor falls and drainage. Assess local thinning at the door. An unheated garage may need a different extent of insulation from a heated workshop. Detail the floor-to-plinth junction and entrance in either case.

Define garage use and loads, design the floor and then select the EPS grade, conductivity and thickness. At delivery, compare labels with the declaration and inspect board edges. Keep batch details and photograph the laid layers before concreting.

EPS suppliers include Arsanit, Paneltech, Austrotherm and Genderka. Compare the documentation for specific products. EPS 200 is an option where the floor design confirms its suitability. A workshop, a multi-bay garage and a heavy-equipment area each require assessment for their own loading conditions.