Thread: Timber for Boatbuilding

cca treatment is an envelope treatment. it seals the outside surfaces only . So once you cut,nail or drill a hole through it ,you've opened up the timber and then it's only a matter of time before decay sets in. i'd advise against it

I didn't know the CCA was only absorbed into the outer layer. You've got me worried about the dozens of fence posts I've cut to size before putting them in the ground on the farm! Oops.
Is there any similar treatment that can be done to boat framing in the home workshop once it's been cut to size and shape (other than epoxy or painting)?

CCA is a treatment that does treat all the way thru if done properly on PINE.H4 plus would be the higher treatment. Hardwood is only treated on the surface.Where ever you cut hardwood,you should treat that cut. LOSP is the pine envelope treatment.(new treatment) As for using CCA in a boat,(Pine) the problem is that there is always the chance that the treatment was not 100% so the timber would very quickly rot.High resin in the timber resists treatment. The saw dust from treated pine is quite toxic,however you proberly should machine it out side. I've also thought of using treated pine, and proberly using a higher grade of pine. no1 and no2 grade would take a treatment alot better.The reason they treat pine is because its the lower grade they use for pickets etc.