PT 6x6

 
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Old 06-03-2009, 11:07 PM   #1
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PT 6x6


Most of the decks I build I cover the 6x6 post with a vinyl sleeve. The customer was trying to keep the cost down so i didnt use the sleeves on this one. The deck is about 8 ft. high and the post are bowing. Is this due to a low grade lumber or is there another solution. I am wondering if they would have bowed even with the sleeve on.
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Old 06-04-2009, 07:09 AM   #2
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Re: PT 6x6


That is the nature of pt mateial exposed to the Sun. The biger the timber the more movement. J.

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Old 06-04-2009, 11:09 PM   #3
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Re: PT 6x6


So you dont think a better grade or different treatment would help? If I get a chance I will post some pics
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Old 06-05-2009, 01:16 AM   #4
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Re: PT 6x6


Treated lumber is just plain nasty stuff. It comes out soaking wet and within months of being in my dry climate it all bows and cups and shrinks like crazy. I always use standard hem fir when I can get away with it, but some times treated is mandatory. I would think that you're having less problems with the sleeve because it isn't in direct sunlight. I would suggest using non-treated if you don't need it
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Old 06-05-2009, 06:46 AM   #5
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Re: PT 6x6


Try better material. I don't remember the last time I had a pt 6x6 warp.
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Old 06-05-2009, 07:13 AM   #6
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Re: PT 6x6


It's the nature of the beast, TP will warp, twist, & check more so than any domestic lumber we use for decks.

Upsell your customer to use RSC or Cont Ht. depending what matches better.

It's not the treatment that causes the problem, it's the nature of southern yellow pine. CCA, ACQ, MCQ it don't matter, all will do the same if yellow pine.
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Last edited by deckman22; 06-05-2009 at 07:16 AM.
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Old 06-05-2009, 07:18 AM   #7
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Re: PT 6x6


Quote:
Originally Posted by deckman22 View Post
It's the nature of the beast, TP will warp, twist, & check more so than any domestic lumber we use for decks.

Upsell your customer to use RSC or Cont Ht. depending what matches better.
R/S cedar, I get.....
but "Cont Ht."???
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Old 06-05-2009, 07:37 AM   #8
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Re: PT 6x6


Quote:
Originally Posted by neolitic View Post
R/S cedar, I get.....
but "Cont Ht."???
What you boys in Indiana never see the good stuff? Cont Ht 6x6's make great deck post, better performing in all aspects & not much more than RSC.

I'm working on a job now that I build in '95, used 6x6 cont. ht. on the upper deck. Those post still look new, a fresh coat of paint helps sure, but not getting soft like RSC post get after that amount of time.
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Old 06-05-2009, 07:41 AM   #9
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Re: PT 6x6


Quote:
Originally Posted by deckman22 View Post
What you boys in Indiana never see the good stuff? Cont Ht 6x6's make great deck post, better performing in all aspects & not much more than RSC.

I'm working on a job now that I build in '95, used 6x6 cont. ht. on the upper deck. Those post still look new, a fresh coat of paint helps sure, but not getting soft like RSC post get after that amount of time.
The question is,
WTF does "Cont. ht"
stand for???
Spell it out.
Never heard or saw, that
abbreviation used here.
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Old 06-05-2009, 08:27 AM   #10
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Re: PT 6x6


Maybe he meant "HT Con.", short for high-tensile conifer...
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Old 06-05-2009, 08:51 AM   #11
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Re: PT 6x6


I agree, better material, be picky and send it back if it is already twisted. The attached deck has all 6 x 6 post, front that carry the roof are 16' with notches cut to receive deck and header, some were quite wet when I cut them and there has been almost no movment!
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Old 06-05-2009, 10:36 AM   #12
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Re: PT 6x6


Neo,
I think it's construction heart redwood 6x6's. Not something we see back here in Maine that's for sure.
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Old 06-05-2009, 10:41 AM   #13
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Re: PT 6x6


Quote:
Originally Posted by MartyCD View Post
Neo,
I think it's construction heart redwood 6x6's. Not something we see back here in Maine that's for sure.
Nor here.
At least not unless
Warren Buffet is writing
the checks and God is
making the order.
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Old 06-05-2009, 11:39 AM   #14
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Re: PT 6x6


I learned my lesson when I lost a whole delivery of pt wood for a covered patio. I spread the wood out on a driveway, checking it all over for major defects. Had to go off on another project, and I left it layed out like that, right in the sun.

I came back three days later to find all the wood so corscrewed that I could have built a few spiral stair cases with it. Every last piece was rendered useless.

Ever since then, I lay pt wood out, stickered if there's a lot, and covered loosely with a tarp. I'll do that for a couple of days, rotating each board every day. And if I've got the time, let it go a few more days uncovered, rotating it as often as I can.

Any wood that sits till the end of the job gets flipped as often as I think of it.

Wood curves for one reason - one side is wet and the cells are swelled, and one side is drier and the cells are compact. The wet side expands, forcing it into a bend.

Allow the wood to dry out evenly, and you'll avoid most of that twisting and bending, as well as most of the cracking.

I might be imagining all this, and maybe I just got a ! )#(*$ batch back then, and I've been wasting my time ever since with this acclimation process - who knows. All I know is that I'm using the same source of lumber, and I haven't had to scrap an entire load of lumber since then.

Last edited by Cerebellum; 06-05-2009 at 11:42 AM.
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Old 06-05-2009, 12:09 PM   #15
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Re: PT 6x6


PT is the worst when it comes to movement. I always try to not use it whenever possible. I prefer fir posts when I have to.
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Old 06-05-2009, 01:28 PM   #16
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Re: PT 6x6


Yes, cont ht = construction heart redwood. It's the most commonly used grade, all heartwood & some knots, they tend to use the good stuff for 6x6's. We used to get the good stuff, B heart (all heartwood, few knots that are quite small) & the really good stuff, clear all heartwood ( the best of the best) here for not much more than cedar back in the 80's. It's cont. ht. or nothing now for the most part, unless you want to pre-pay & then wait 30-60 days to get the good stuff.

The redwood siding used on my parents first home back in Ohio is still on that house, it was built in '59. My mother in law's house in Corpus Christi, has redwood siding on it, that house was built in the 30's & that siding is in great shape. Her garage was built totally with redwood, studs, joist, rafters & siding, looks like b heart. I'm going to salvage the whole deal cause she doesn't use it anymore, that wood is too good to waste away in a landfill.

It's a shame those lumberyards in the midwest won't bring in redwood for you boys to work with, some of the nicest wood you'd ever work with. Granted what we get now is not like the old virgin growth redwood, but I'd take it over cedar anyday.
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Old 06-05-2009, 04:43 PM   #17
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Re: PT 6x6


No disrespect, but "const"
is the standard abbreviation
for construction grade.
Standard is "hrt" for
heart wood.

Economy Lumber Company Economy Lumber Co.
............
2418RR 2x4 18' Redwood Const Com Rough Redwood 2x Rough Rwd
2420RR 2x4 20' Redwood Const Com Rough Redwood 2x Rough Rwd
248RHR 2x4 8' Redwood Const Hrt Rough Redwood 2x Rough Rwd
2416RHR 2x4 16' Redwood Const Hrt Rough Redwood 2x Rough Rwd
26RR 2x6 R/l Redwood Const Hrt Rough Redwood 2x Rough Rwd
266RR 2x6 6' Redwood Const Hrt Rough Redwood 2x Rough Rwd
268RR 2x6 8' Redwood Const Hrt Rough Redwood 2x Rough Rwd
2610RR 2x6 10' Redwood Const Hrt Rough Redwood 2x Rough Rwd


The "HT" grading stamp
means "meets heat treatment
standards" (to kill bugs I think.)

Just helps when we all speak
the same language.
Even if we can't buy the same lumber.
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Old 06-05-2009, 05:00 PM   #18
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Re: PT 6x6


Yo Neo, thats what they call it Con Ht redwood. Like the Al was saying its pretty good stuff I have a local supplier that brings it in. The grade dosent allow the sap wood thus the hart thing but it has the old growth knot grade that = con.

Even the Ht B that was cvg is now wide grain but funny thing the RW 6x6 beams still have some cvg mixed in the con ht grade. Not really bad on price for the 6x6 around $9 a running ft. J.

Side Note...Redwood has so many Grades a person has just got to go look at the stuff.
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Old 06-05-2009, 11:21 PM   #19
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Re: PT 6x6


"Cont ht" threw me for a loop too. Here we have con common, con heart and clear as the most common grades available.

As for using it for posts, it really isn't very strong and is getting to be expensive! Our redwood prices are going up more than any other lumber.
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Old 06-05-2009, 11:43 PM   #20
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Re: PT 6x6


Vinyl Sleeves do seem to help. Ive never had a complaint when using sleeved 6x6's

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