I was given some previously used lumber for a project i am trying to complete. I want to build a raised bed for a vegetable garden. I have read that it is not a good idea to use pressure treated lumber from more than 3 years ago. I am not sure if this wood is pressure treated or not, the wood is stamped with the following. (TP:No.1 KD-19 718 SYP). Can anyone tell me if this is pressure treated?
ianmatthew
Welcome to the forum.
I am not up on grade markings, but generally if wood is pressure treated it will have a reddish or greenish colour. Some of the older pressure treated wood had some very harmful chemicals in them. If you are concerned you could line your raised bed with six mil plastic to keep the soil from contacting the lumber. That should eliminate any concern of the chemicals getting into your veggies.
Gerry
I am not up on grade markings, but generally if wood is pressure treated it will have a reddish or greenish colour. Some of the older pressure treated wood had some very harmful chemicals in them. If you are concerned you could line your raised bed with six mil plastic to keep the soil from contacting the lumber. That should eliminate any concern of the chemicals getting into your veggies.
Gerry
Can't tell much from that stamp:
TP = Timber Products Inspection
No.1 = Lumber grading (quality)
KD-19= Kiln Dried to no more than 19% MC
718 = Mill ID #
SYP = Southern Yellow Pine
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TP = Timber Products Inspection
No.1 = Lumber grading (quality)
KD-19= Kiln Dried to no more than 19% MC
718 = Mill ID #
SYP = Southern Yellow Pine
Usually/normally if a wood is PT than in addition to the stamped info there will also be a retention number stamped IE. .25 which is NOT ground contact; .40 is ground contact. Sounds like your lumber is not pt IMHO:smile:
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