Installation of WPC terrace boards


Wood polymer composite material

  WPC (Wood Plastic Composite) products

storage and assembly instructions.


Before starting the installation work, make sure that all the components necessary for the construction of the terrace are in the packaging.

Before starting the installation work, it would be necessary to do and observe:

  • Carefully remove all necessary materials from the packaging;
  • Make sure that the installation space for the terrace is clean and free of unnecessary materials;
  • To create a load-bearing structure with a small slope (1.5o-2o angle) to facilitate the drainage of water from the terrace surface;
  • Design the load-bearing structure so that air can circulate freely in the lower part of the terrace;
  • The surface of the load-bearing structure must be precise and the materials used (if no support polymers for the wood polymer composite are used) must be of good quality;
  • All defects, inaccuracies and deformations of the load-bearing structure will be reflected in the quality of the terrace surface;
  • Do not use WPC terrace floorboards in the construction of load-bearing structures!
  • Observe the relevant building regulations when constructing the terrace load-bearing structure!


The use of WPC support rails is only permitted if the terrace is built on a continuous, level and solid base, such as concrete, flat roofs, etc. The surface must be flat and slightly sloping to prevent water from accumulating on it. Rails are placed directly on the surface so that they do not interfere with the drainage of water. If the boards are attached perpendicular to the support rails, the maximum permissible distance between the support rails is 40 cm. If the terrace will be subjected to heavy loads (furniture, a lot of people) the recommended distance between the support rails is 30 cm. If the boards are to be fixed at an angle (eg at an angle of 45o to the support rails), the distance between the rails must be reduced.

Distance between supports 40cm

The end of each board must rest on its own support rail

Two rails screwed together are placed under the end connection of the boards. The rails are attached to the base with dowels and screws. Drill the rails before screwing. If the rails are placed at the other end, a gap of 5 mm have to be left between their ends. The same gap is left between the end of the rail and a stationary object, for instance, a house wall. If the waterproofing of the base can`t be affected, the rails may also not be fixed to the base.

 In this case, the ends of the rails are placed next to each other so that they are at least 10 cm together and screwed together.