Decking is a fairly quick way of achieving a level
path or patio without having to carry out a massive
amount of ground preparation.
Generally you can use the same rules for constructing
a floor in your house. You will need joist bearers at
400mm centers to support the decking across the main
area and at the edge of the decking.
Each must be supported at regular intervals by a post
to the ground.
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The diagram below shows the general arrangement.
Intermediate joists will also be required at 1000mm
intervals to give added support to decking which may
be installed at an angle. This will also stop the main
joists twisting as the decking is used.
A typical layout is indicated below.
Decking planks can be installed at an angle to make
it look more interesting and prevent people slipping
on the surface when wet.
Before fixing the decking it is advisable to treat the joists with a wood preservative and also lay a weed quilt under the joists to prevent weeds growing up through the gaps in the decking boards. Decking boards are best fixed down with 70mm screws and each board spaced at about 4mm gap. This spacing tends to increase as the boards shrink with age.
When the decking is fixed apply a timber preservative
to the finished decking and it will look smart and fully
seal any holes made by the screwing down of the boards.