For instance, in order to gap wood decking properly—to allow for drainage and prevent debris from collecting between boards—you need to know about its moisture content. Sun exposure will dry wet decking, which will cause it to shrink; a moist environment may cause very dry decking to swell.
Most deck builders install deck boards on delivery. Although this way is easiest. pressure-treated boards probably will vary greatly in moisture content and often will shrink unevenly. In the case of preservative-treated wood.
Proper spacing allows moisture to drain off the deck between the boards. Wood expands when it's wet. If the boards are wet when you install them, you can probably butt them close together without any gap. They should shrink as they dry out and produce adequate gaps between the boards.
Building Tips for Pressure-Treated Wood: Proper Board Spacing and Sealing End Cuts Brought to you by Wood, Naturally Lumber’s natural beauty makes it an ideal choice for your next deck or outdoor project.
In twenty-five years of carpentry my atrium deck is the only deck that has never shrank. 5/4 X 6 is the smallest decking I use and it definitely shrinks. Cedar or mahogany may not shrink like pt, but I would never a speed square to gap decking. With pt decking, you would end up with 3/8 to 1/2 gap. I would consider that dangerous.
And when it comes to pressure-treated wood for decks, porches and other outdoor applications, there is a high standard of construction and maintenance best practices, along with a specific set of pressure-treated wood use categories (UC) to help ensure contractor and client satisfaction. Below are six common treated wood decking project mistakes.
does treated wood deck board on decks shrink. However, no one carries that sized board so I wonder, was the wood left to shrink down to the size before install I see nothing but Take Seven Trust s specifications for a nominal x x decking board for example If this is pressure treated wood, would that mean that ...
Treated wood is often still damp when delivered, so it is recommended to butt deck boards tightly together during installation as they will shrink slightly in width and length as they dry out. How much a board will shrink will be dependent on how much moisture remained in the wood when it was installed.
No Gap: If the pressure treated wood hasn’t been dried and is still wet with preservative, butt the deck boards together when attaching, since the wood will shrink some when it dries. …
Yes it does shrink no matter how tight they are when nailed. Cedar, which is not cheap, is a good option for a house deck - we had little, if any, shrinkage. Probably not too practical for a chicken coop though.
If the natural look of wood is tops on your list, use cedar for wood decking. The heartwood of the tree (the deeper colored red part, not the white sap part) is rot resistant. Cedar doesn’t readily absorb moisture— and, since moisture is what creates twisting and splitting, cedar wood decking tends to lie flat and straight.