Weathershield lumber is pressure treated which means the board has been submersed in a pressurized bath of whatever chemicals are used to provide the protection. The pressure forces the chemical into the open cells of the wood, so the protective chemicals are throughout the wood, not just on the surface. Therefore, the weather protection is not jeopardized if you plane the surface. However, I also agree that adding a coat of spar urethane will improve protection against weathering and is a good practice.
I am sure you can have them cut.
We used them in a similar fashion for our driveway. Just make sure you get straight boards.
My HD in Lanham, MD. has 308 boards available for curbside pick-up
I think it will work. Todays pressure treated wood is supposed to be safe for pets and even raised flower beds. If I use this I will paint it. I am also looking at red cedar, which I would just apply a sealent too.
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I don’t see why not. 1x4’s might be better for the door but that’s just an opinion. I’ve used the pressure treated product for several outdoor projects and have been pleased with the results.
yes, slight roundover.
Yes, but why, when an indoor plank is typically less expensive and does not need the weather treatment? If it's insect resistance indoors you need, then OK, that's reasonable.
Yes, but I would recommend something larger. These are not really big enough to hold any weight.