You might be referring to 'pressure treated' lumber, or lumber that has been milled but not dry.
yes it can
PT lumber is regular wood with a chemical preservative which has been forced to penetrate the wood using pressure.
Pressure treated timber is timber impregnated with chromated copper arsenate under pressure and vacuum cycles. These preserve the timber from various fungicides that would normally eat the timber reducing its life-span.
Arsenic treated lumber is not being sold, but other pressure treated wood will be safe to use for your raised beds. Composite lumber and cedar lumber will both be safe and will last a long time for raised beds.
You might be referring to 'pressure treated' lumber, or lumber that has been milled but not dry.
yes it can
PT lumber is regular wood with a chemical preservative which has been forced to penetrate the wood using pressure.
Older pressure treated lumber known as CCA was treated with 3 substances, Chrome, Copper, and Arsenic. Newer treated lumber intended for consumer contact is now treated with different chemicals, such as copper/boron. Lumber NOT intended for consumer contact, such as buried or submerged lumber may still be CCA treated. PS- it is not a good idea to burn ANY treated lumber. If it kills bugs and fungi, it is likely not real good for you, either.
Small slits or holes are poked in lumber when it is incised. It is done before treating the lumber with chemicals. Some lumber does not require incising. Lumber that doesn't require incising are Southern softwoods. Incising does effect the ultimate strength of the lumber, but not by much, say 2 to 5%. It is still considered a good trade off if the lumber is having additional value added treatments.
There are chemical used in the pressure treatment that may be harmful.
It doesn't need to be treated. It is resistant to fungus without treatment.
Preservatively-treated (pressure-treated) wood does not meet the standard, unless the wood was heat-treated and stamped HT prior to preservative treatment.
Yes, allow the pressure treated wood to dry to allow for shrinkage.
Pressure treated timber is timber impregnated with chromated copper arsenate under pressure and vacuum cycles. These preserve the timber from various fungicides that would normally eat the timber reducing its life-span.
Yes,You can find 1x4 treated lumber at most large home improvement stores or lumberyards.
Arsenic treated lumber is not being sold, but other pressure treated wood will be safe to use for your raised beds. Composite lumber and cedar lumber will both be safe and will last a long time for raised beds.