new pressure treated screws

[rockyrude]

I'm collecting materials to start my rebuild. I planned on using pressure treated but I am only finding the new acq stuff. I know it eats most screws, but I've seen screws that are supposed to be treated to stand up to the acq wood. Has anybody used them or know anything about them.
Thanks

 

[jdcoombs]

Re: new pressure treated screws

Alkaline Copper Quaternary (ACQ) treatment has completely replaced the Cupric Arsenate (arsenic) treatments. The only place you'll find the latter is in old stock, and it'd have to be quite old. Here is a site fon info:
http://www.ufpi.com/literature/acqfastener-216.pdf
Basically Bronze are commonly the best. I think some HD galv will work but not sure. Some of the stainless will work.
Here are some ACQ fastener sites:
http://www.shop.com/10_x_2+_inch_Heavy_Duty_Bronze_ACQ_Compatible_'Star_Drive'_Exterior_Wood_Screws_2M_per_carton_HDB212-34444033-44980991-p!.shtml?sourceid=298

http://homerenorepair.suite101.com/article.cfm/screws_for_pressuretreated_wood

Good luck. Let me know if you'll need any more. Also check Simpson Strong tie, and Powers Fasteners. Sorry, no site for them 'cuz I gotta run.

 

[Robj]

Re: new pressure treated screws

Try some of the lumberyards that are aimed at builders. They may have some. While it is being phased out, it should still be available. Oops bought some a few days ago. But this is up north in Canada.

Good luck and have a great day,

Rob.

 

[watermellonI]

Re: new pressure treated screws

I used TAPCONs Rocky, I didn t know pt would eat screws, and I didn t have anything else on hand, got them at that place tony stewart drives for.
I really don t know how they ll last though.

 

[burroak]

Re: new pressure treated screws

FASTENAL is a distributor of fasteners to all the trades and is a national company. They can supply you with a coated flat head countersunk head with a torx drive slot and is self-tapping. It gives you the best of all worlds. No pilot holes to drill and risk compromising the hull in tight spaces; the torx head is a positive lock driver; and can be sunken below the surface of the deck to permit a smooth look. At first glance the price may be higher than deck screws or drywall screws but the extra cost is worth it.

 

[jdcoombs]

Re: new pressure treated screws

Tapcons are a hardened carbon steel, anf the threads are smaller and may pull out of soft wood. They will last until the coating gets scratched or rubbed off. Likewise the coated deck screws. Bot good choices, but have a finite corrosion lifetime and corrode slower than mild steel fasteners. The stainless is the way to go. See what the fasterer makers say. FASTENAL sounds like a good one.

 

[BillP]

Re: new pressure treated screws

Maybe some clarification is needed...CCA isn't outlawed and is still being produced for commercial use. The EPA reg against using CCA is only for residental use. Lowes, HomeDepo, 84 Lumber, etc still sell it where I live and it isn't old stock...anyone can buy it. The fasteners speced for ACQ that are generally used in the industry and accepted by building codes are hot (not electro) galvanized or SS. SS is preferred (passivated the best).

bp

 

[thurps]

Re: new pressure treated screws

Why would one use anything but stainless fasteners in a boat? Ring shank nails and construction glue probably as good as screws.

 

[rockyrude]

Re: new pressure treated screws

It seemed to me, that in another post the acq treated wood would even corrode stainless.

 

[BillP]

Re: new pressure treated screws

The reason people chose not to use SS "everywhere" on a boat is because it can suffer from crevis corrosion. Bronze doesn't have that issue and is better for below the waterline use...but costs way more than SS.

Whatever the corrosion problem is with SS & ACQ it must not be much to worry about or it wouldn't be speced in building codes for structural use on commercial buildings. I read some specs on ACQ that said to use oversize fasteners if not using hot galv or SS. If it bothers anyone that bad they could drill oversized holes, fill them in with a structural filler and re-drill a center pilot hole in the filler to isolate the fastener.

Also, if using coated fasteners it's recommened by the fastener companies to screw them in. It reduces the chance of the coating being scrubbed off.

bp