How to install WPC boards yourself

WPC decking is a very easy way to easily build an individual terrace from prefabricated elements with optimal properties. How this works is described step by step.

Background information

WPC stands for Wood-Plastic Composite, which is a composite of plastic and wood that is manufactured industrially. It is made of wood flour and mostly polypropylene. This makes it slightly more resistant to moisture than wood, but also less resistant to breakage. The preformed elements make a quick and easy terrace construction possible.

However, WPC can fade over time, and shows the same signs of deterioration as wood, albeit over a longer period of time. Since the end of 2007, WPC has been able to rely on a quality seal of the quality community Holzwerkstoffe e.V.

Substructure for WPC decking

WPC decking boards are mounted on special sub-profiles, also made of WPC. These sub-profiles must rest on a stable, continuous load-bearing surface. Point foundations on both ends of the side rails, such as wood substructures, do not work on WPC decking.

Creation of a stable subsoil is necessary

Such a stable subsoil can either be compacted gravel beds with a laying layer of sand, or a thin concrete bed or a screed covering. Concrete blocks must also be laid as support points on a gravel underground.

Step-by-step instructions for terrace construction with WPC decking

  • Underprofiles
  • Gravel
  • Concrete slabs
  • Sand for laying layer
  • Decking made of WPC
  • Fixing material for decking
  • Stainless screws
  • Connecting pieces and end connectors for decking
  • Facing panels
  • Cordless screwdriver
  • Tape measure
  • Spirit level
  • Vibratory plate
  • Rubber hammer
  • Suitable saw for the profiles
  • Possible miter saw
  • Vibratory plate
  • Graph paper and calculator for planning

1. Preparatory planning and substrate preparation

Remove the desired terrace surface and transfer the dimensions to graph paper. First plan the structure of WPC profiles and then the demand for decking. Make sure that the concrete blocks are not more than 40 cm apart in your planning.

Now pour a 15 cm thick gravel bed and compact it carefully with the vibrating plate. Then apply a layer of sand around 5 cm thick and place the concrete blocks at regular intervals as planned. You can easily pat them in with a rubber mallet. Ver 2. Laying the WPC subprofiles

Cut the WPC subprofiles to the correct length and place them parallel to the later direction of the decking in parallel to the concrete blocks. Use the spirit level to check that the level is horizontal and then knock the concrete blocks in such a way that there is a 2% gradient away from the house.

3. Installation

Screw the initial assembly clip to all subprofiles, pre-drilling is recommended here. Attach the first row of boards and add more mounting clips to attach the next row of boards. Screw the last row of boards using screws screwed in at a 45 ° angle, which must be slightly longer than the fastening screws for the mounting clips.

4. Blending the terrace

At the end you can blind the finished terrace on the sides - depending on whether it is a single or an angled panel, the veneering elements are either screwed to the substructure or the edge of the board.

Tips & Tricks Note that WPC "works" as well as wood, ie contracts in length and expands again. Plank joints should therefore always be around 3 to 4 millimeters, even to the wall of the house.

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