Istallation guidelines of Natural Woods

Not only about great quality and look. The procedure for installing your decking highly contributes to meeting the expectations of the customer. Carefully following the installation guidelines significantly limits the risk that the wood, a natural living element, might move, therefore compromising the overall tightness of the floor. We recommend that you read carefully the following requirements.
If you encounter any questions or concerns during the design or installation, please do not hesitate to contact us and we will be happy to offer you all the assistance needed.
The general instructions about the installation of joists are suitable for hardwood as well as Ultrashield and Décowood. The specifica instructions for Ultrashield and Décowood installation are in the next few pages.

1. Preparation of the soil

posa su superficie instabileThe ground floor must be made flat with a slope of about 1 cm per linear meter. To correct an uneven slope you can use “compensation heels”- is wooden pieces derived from the same joists and fixed to the ground and/or to the joists.
In case of installation on unstable ground (Fig. 1) it is necessary to level the surface (in case of installation on soil, spread a layer of fabric to prevent the regrowth of the grass). In order to stabilize the surface upon which the joists will be layed, it is necessary to use concrete beams sized 30×30 cm (Fig. 1). It is recommended to build a double frame with two perpendicular rows of joists (Fig.1), the first with 1 meter distance, the second with a distance of 30 cm (in case of installation with clips) or 45 cm (in the case of installation with screws): this will make the structure perfectly stable.
In order to achieve the best stability, Déco recommends to build the substructure in durable wood, even in case of different heights and uneven soil. This recommendations applies in case of installation of hardwood decking as well as Ultrashield or Décowood.

 

2. Installation of the substructure of joists

posa su cemento

The joists, which must be as straight as possible, need to be fixed to the concrete with screws or bolts (Fig. 2).
If the joists cannot be fixed to the cement (e.g. terrace with waterproof sheeting), build a structure with braces (Fig. 3) or a double frame.
It is mandatory that all ends of the boards are placed on and fixed to a joist, designing and assembling the substructure as a result, if necessary doubling the joists where two ends meet. This is because the heads of the boards are the most sensitive area for the movement of the wood and it is important to be well anchored to the substructure, being them fixed with two screws or clips.
 
posa su guaina È imperativo prevedere che tutte le teste delle doghe vengano fissate su un magatello, progettando e montando la sottostruttura di conseguenza, eventualmente raddoppiando i magatelli laddove due teste siano adiacenti; questo perché le teste delle doghe sono la zona più sensibile per i movimenti del legno ed è importante che siano bene ancorate alla sottostruttura, venendo ad essa fissate con due viti o due clip.

3. Installation of decking

For a proper installation of decking, it is important to wash the boards before proceeding. This is to ensure that the tannins in the wood is released therefore preventing it from staining the areas adjacent to the pavement.
There are two ways to install decking: with visible screws and with clips.

 

a. VISIBLE SCREWS (Fig. 4)

posa con viti a vista

Visible screws are undoubtedly the most secure method because they allow the boards to anchor directly to the substructure. Despite the overall look is considered less attractive by some, this remains the preferred method.The procedure is as follows:
  • Install the first row of boards, which must be perfectly straight.
  • It is always necessary to make a pilot hole (Fig. 4.1) and countersink before installing the screws. These must be at a distance of approx. 2 cm from the ends and the sides of the boards in order to avoid cracks in the wood (Fig. 4.2).
  • The boards are then installed with the convex side towards the previous ones and firstly fixed with screws only at the ends. The end has to be pushed to the board , this way also determining the correct distance between the two strips (no less than 5 mm) (Fig. 4.2).
  • Once having installed all the boards, it will be necessary to use a chisel (or any suitable object to act as a lever) to space the boards evenly at 5 mm.
  • Finally screw the boards to the joists (Fig. 4.2), using a wiretap to draw a perfectly straight line and this way improve the look of the pavement (Fig. 4.3).

 

b. CLIPS (Fig. 5)

5-posa-clip

The clips do not allow the boards to be directly fixed to the joists, thus exposing the flooring to the risk of movements. This type of installation is therefore recommended only with proven stability woods.
Moreover, the inspection and / or replacement of damaged boards will be very difficult with this type of installation.

The procedure is as follows:

  • Install the first row of boards, which must be perfectly straight and secured
    with screws on the very outer side (Fig. 5.1).
  • Insert the clips into the groove, ensuring that they are properly seated (Fig. 5.2).
  • Tighten the clips to the underneath joist (Fig. 5.1).
  • Proceed this way with the further rows, then check every 3 or 4 boards that the distance. between the first and the last ones is always the same along the whole line. Otherwise you should review the parallels.
  • Complete the deck and fix the outer side of the last board with screws.
  • A possible pattern is shown in Fig. 5.3.

 

Lubrication

Once decking is installed, it is recommended to apply two coats of exterior oil, 72 hours one after the other. This operation, to be repeated every 6 months/1 year depending on weather conditions, it is necessary to preserve the colour of the wood and prevent it from cracking, especially on the ends of the boards. On the other hand the lack of this kind of maintenance does not affect the stability of the floor at all.