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On hard ground, even irregular, the installation of the blades requires to determine the height of the terrace and to provide a space for the flow of rainwater.

Wooden terraces: laying boards on joists

To cover a tiled or masonry terrace, as here, it is sufficient to fix joists (detached from the ground by thin plastic blocks) with dowels to hit.
If the terrace is in poor condition, support your joists on adjustable pads that compensate for uneven ground. You must first define the level of your terrace.
The interstices between the blades allowing the rain to evacuate, a wooden deck can be at the same level as the interior floor, while tiled, it must be lower than the interior to prevent infiltration.

Install the joists

Install the joists

Install the joists perpendicular to the laying direction of the deck boards.
Space them so that the distance between them does not exceed 50cm.

Wooden terraces: laying boards on joists: wooden

To prevent the joists from coming into contact with the walls, slide small plastic shims to obtain a gap of approximately 1 cm.

Wooden terraces: laying boards on joists: wooden

Check the flatness of the set with a bubble level and a mason rule.
If the floor is not flat, slip wedges under the joists.

Wooden terraces: laying boards on joists: boards

Drill pilot holes in the joists every 70cm.
Drill the slab through these holes with a concrete drill.

Wooden terraces: laying boards on joists: boards

Fix the joists with pegs to hit.

Edge blade

Edge blade

The last joist is doubled to support a perpendicular blade used to surround the decking.

Wooden terraces: laying boards on joists: terraces

Place the shims and the offset blade 1cm from the front.
Screw the edge blade into the two joists by placing two stainless steel screws every 40cm approximately.

Install the first blade

Install the first blade

Lay the first entire blade on your joists, place the shims to respect the gauge, and then locate the cut line.

Wooden terraces: laying boards on joists: wooden

Cutting the first blade

Cut the blades using a circular saw or jigsaw.
On exotic woods (very hard), a special metal blade will be needed.

Wooden terraces: laying boards on joists: wooden

Realization of a drilling gabari

Use the chute as a drilling template: trace markers to a quarter of a distance joist to help you identify the location of the holes.

Wooden terraces: laying boards on joists: terraces

Drill the blade with the Gabari

Lay the jig on the blade and then with the drill, mark the location of the screws by reusing the first holes.

Wooden terraces: laying boards on joists: wooden

Pre-drill and mill the blades.

Wooden terraces: laying boards on joists: wooden

Screw the other end of the blade making sure that a gap of 1cm separates the wood from the masonry.
You can then remove the holds.

Continue installing the deck boards

Continue installing the deck boards

Continue this way by cutting and positioning three to five blades.
First fix the ends of the blades.

Wooden terraces: laying boards on joists: joists

Draw a light line on the first set of five blades at the joist location.
The screws will be perfectly aligned on this mark.
Tip: Note the line on the wall to locate the middle of the joist

Wooden terraces: laying boards on joists: boards

Mark the location of two screws per blade on the screw line using the drilling template and pre-drill and mill the blades.

Wooden terraces: laying boards on joists: joists

Screw the blades one by one.
If they are not perfectly straight (which is common), you must force before screwing to maintain a gap of 1cm between blades.

Two butt blades

Two butt blades

If you need to butt two blades, cut them halfway down to prevent them from being cantilevered.

Wooden terraces: laying boards on joists: laying

Trace your cut with a square.

Wooden terraces: laying boards on joists: boards

Using the installation template, pre-drill the two blades and screw them onto the joists.
Always place two screws to prevent the blades from twisting.


Video Instruction: How to Lay Decking with Wickes