Q: How do I create a free draining structure?
As part of planning the deck should be designed with a free draining structure. For adequate run off decks should be laid on a slight gradient, at least 1 in 1OO. Grooved decking should be laid down the fall to enable water run all and ensure the groove ends can drain freely i.e. pack out fascia if required.
Q: What gap should I leave between deck boards?
A Deck boards should be surface dry and laid with no less than a 6mm gap between boards to allow for seasonal shrinkage or swelling. When installing hardwood decking you should allow 8mm gaps as the product is kiln dried hardwood and requires room for expansion in the wetter seasons.
Q: Why is it advisable to loose-lay components before securing them?
The longer the components, particularly deck boards, are left to become surface dry the less the effects of shrinkage will be apparent after fixing them. The timber can also be cut and sanded more easily when dry. If the boards are allowed to fully dry out prior to fitting, the gap between boards should be increased by 2-3mm to allow subsequent expansion in the wetter seasons.
Q What type of fixings should I use?
For the very best results stainless steel screws should be used at 2 1/2 times the thickness of the deck board. To avoid splitting it is advisable to pre-drill pilot holes near the end of the boards.
Q: Where can I obtain more detailed guidance?
The Timber Decking Association is an excellent source of information.
SCREWING NEWEL POST WITH LEVEL
How To Install Decking Part 1
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