I have weighted and clamped stacks of wood in attempt to keep the warping to a minimum. All PT lumber comes wet. They put it under pressure and force chemicals into it. Then they palletize it tightly so it won't warp in transit and ship it. I usually lay the boards out on a flat surface stacked up in criss cross layers with air space between each board. I put some cinder blocks on top to keep the top layers from warping. In the summer in Oklahoma they dry and shrink n a couple of weeks.
I only do this on boards where I care about the appearance. However when the shrink they tend to split along the grain where the screws are because the screws won't let the board shrink so it splits instead. If the deck boards do warp before installing you can use a couple of wedges to force them straight but it is a PITA.
Most likely you got wood that had sat out in the weather and been rained on. Since this is pressure-treated wood it will be fine.
Agreed on using only hot-dipped galvanized or stainless steel fasteners and hardware; the less-toxic chemicals now used for pressure-treating wood are unfortunately more corrosive to metal. Something I've done under e.
Preferable to avoid trapping moisture next to the metal though, maybe spacers next time. Yes, let it dry. Working with wet treated wood is a very bad idea unless you like shrinkage, cracks, gaps, squeaks, etc.
Let your framing and decking dry out first. Here in Oregon that means buy the wood and store it in a DRY place. Building with wet wood only causes issue later. I buy p t lumber ahead of time, and stack it with spacers in between in my garage.
Doinng it anyother way, would be like mixing your stain with water. There are many variables to consider, and I am in agreement. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group.
Create a free Team What is Teams? Learn more. Should I let pressure treated lumber dry before building with it? Ask Question. Copper is still the most widely used element in wood preservatives and creates a green color on the wood. The most common preservative used to pressure -treat lumber for home construction was chromated copper arsenate.
Wood treated with this chemical is light- green in color, but as of the U. Environmental Protection Agency has banned the use of this type of lumber in home construction. Generally, yes. Most wood that is treated with a waterborne treatment is treated through its entire thickness to varying levels of retention.
Ripping treated dimension lumber and putting it in contact with concrete is nothing to be concerned about. In rough-cut condition, a 2x4 is slightly less than 2 inches thick and approximately 4 inches wide.
Does pressure treated lumber shrink in length? Category: hobbies and interests woodworking. Over time, most treated lumber will shrink slightly across its width as it dries out. Take this small amount of shrinkage into account when laying decking or fence boards.
After being outdoors for six to 12 months, treated lumber will develop cracks, called "checks," along the surface of each board. Can you pressure treat your own lumber? How do you keep treated lumber from warping?
Properly drying or curing wood to prevent warping. Don't allow partially dry lumber to quickly regain moisture. Do termites eat pressure treated wood? Should pressure treated wood be sealed? How long does it take for pressure treated lumber to dry out?
Can you put pressure treated wood in concrete? When you buy through links on our site, we may earn an affiliate commission at no additional cost to you. That mostly includes standing up to the wear and tear of moisture, but what about changes in temperature? Untreated wood will shrink to its smallest possible capacity in cold Winter months contract but also grow to its largest possible dimensions during warmer periods expand. Does that hold true even for pressure treated wood though?
Ultimately, pressure treated wood will shrink — but not as much as untreated wood. In fact if treated boards are left out in the sun for too long the boards will start to warp and twist. Some homeowners are surprised when gaps appear in their once tight deck only two days later, but a small space is actually good for letting dirt and debris fall through as well as drainage.
Aside from gaps between boards, the shrinkage should be accounted for on overhangs. It should also be noted that the majority of shrinkage comes in the width of the board, across the face of the grain because wood is hygroscopic absorbs moisture from the air.
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