Although these hardwood joists can’t be seen when your deck is complete, they are perhaps more important than your deck boards. Deck joists, also known as structural timber joists or timber beams, give you the framework to attach your decking boards and play a very important part in ascertaining the strength and durability of your decking. If this part of the decking is skipped, you stand to compromise the service life of your deck, regardless of the quality of the deck boards. The size of the joist correlates to a number of factors including the weight bearing that is required and whether the deck joists will sit directly on the ground or be raised.
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