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OT: Preserving Pressure treated wood posts??

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Paul Schultz

03-17-2007 10:35:09




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We are in the process of building a new house. It has an elevated wrap around deck supported by 6x6 pressure treated posts. On one side of the house they had to dig a trench and place the footings at the base. The bottom 3-5 feet of these posts will be buried underground. Even though these are pressure treated should I have these treated with anything else to further protect them?

Thanks,

Paul.

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soundguy

03-17-2007 23:50:45




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 Re: OT: Preserving Pressure treated wood posts?? in reply to Paul Schultz, 03-17-2007 10:35:09  
Get a 5g pail of copper napthenate 'post dip' set your posts in it, then drop em in the ground. Don't be messy.. pretty much turns anything 'green' permanently.. oh.. and it WILL remove hair..

Soundguy



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BishopNsunset

03-17-2007 19:19:13




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 Re: OT: Preserving Pressure treated wood posts?? in reply to Paul Schultz, 03-17-2007 10:35:09  
Best I remember, since it's been a few years, the pressure treated lumber that has a .025 rating is for above ground only, but if you use the .040 rated PT it will last between 30-50 years below ground level.
Some .040 PT lumber has been tested after been buried for 30 years a shows no sign of decay.



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Bob Harvey

03-17-2007 18:49:39




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 Re: OT: Preserving Pressure treated wood posts?? in reply to Paul Schultz, 03-17-2007 10:35:09  
My line of work also. On the 'wet' coast I make sure all the 'cuts' are treated with the same preservative that the material is done in (REALLY hard to get). We normally backfill with drain rock BELOW the level of the wood and add flashings to direct as much rainwater as possible away from the wood, including a cap on the post. I've got stuff that is still good from '79.



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Indiana Jones

03-17-2007 16:05:01




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 Re: OT: Preserving Pressure treated wood posts?? in reply to Paul Schultz, 03-17-2007 10:35:09  
I treated the ground ends of posts on the last pole building I built with roofing tar (or was it called roof sealer? - anyways, it was black and it stunk). Been only about 12 years back or so, so can't give you any info on long-term effectiveness. Should be able to get the stuff from Farm & Fleet or Home Depot, etc. in 5 gallon cans relatively inexpensively.



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Hobo,NC

03-17-2007 15:35:51




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 Re: OT: Preserving Pressure treated wood posts?? in reply to Paul Schultz, 03-17-2007 10:35:09  
I have a customer that's a big contractor and will pour a couple hundred yards of concrete at a time and that's a small pour to'em. So he stopped by today in a jam and while i werked on hiz personal truck we got to talk'n concrete. I spec he told me more than He should. He said to call Monday and order 40 yards and that you want it here @ 6 AM. He said you will not git it cuzz my dilivery comes first and I turn down around 3 loads every day so who do you think gits what i turn down. They return back to the plant and add a reducer and ship it to the next victim. He said when he calls he specified the mix down to how much sand and what type of water goes into the sand so on and so on. when its delivered he test and takes a temperature check of the mix if the temp izz more 5 degrees over the out side temp he rejects it. He calls it hot and will not use it. Course i still don't know much about it other than its rite complicated. Nuttin to do wif yer poles but sum'n I would have never thought about.

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Frank (N.Mi.)

03-17-2007 11:02:19




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 Re: OT: Preserving Pressure treated wood posts?? in reply to Paul Schultz, 03-17-2007 10:35:09  
Paul, if the builder knows his stuff then he probably used posts treated for burial. It is possible to get wood treated to different degrees depending on their intended use. See if you can find a tag fastened to the post ends anywhere, and maybe you can read it. The tag should tell the treatment, though you may have to decipher it. There is a website to help with reading the tags but I can't remember it.

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Dell (WA)

03-17-2007 10:59:46




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 Re: OT: Preserving Pressure treated wood posts?? in reply to Paul Schultz, 03-17-2007 10:35:09  
Paul..... .dunnno iff'n enny extra preservative is required. But I do know DON'T CEMENT TREATED POSTS!!! Why? 'cuz yer fencepost will be setting in WATER BASIN created by the cement. ROTTS even treated posts FAST..... ...Dell



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Dunk

03-17-2007 12:11:32




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 Re: OT: Preserving Pressure treated wood posts?? in reply to Dell (WA), 03-17-2007 10:59:46  
That is more or less what I was thinking, Dell.

If you wanted to not have to worry about the "in the ground part" so much, I would suggest pouring concrete piers, with a method to attach to the posts to the top of the piers.



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Paul Schultz

03-17-2007 13:52:24




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 Re: OT: Preserving Pressure treated wood posts?? in reply to Dunk, 03-17-2007 12:11:32  
Dunk,

We have the piers. It is just on this side of the house they had to dig down to virgin ground (we had this side groomed by the excavator). If the piers are not in virgin (firm) ground there can be some potential shifting of the piers/posts from settling. So, they re-dug a trench down to virgin ground. This has led to the piers being below final grade and the portion of the posts being buried.


....and in response to the previous post...

All posts are pressure treated but no provision was made for purchasing "below ground" treated posts (I did not know this type of treatment exisisted).

Paul.

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Dunk

03-17-2007 14:12:28




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 Re: OT: Preserving Pressure treated wood posts?? in reply to Paul Schultz, 03-17-2007 13:52:24  
I was thinking more along the lines of taking the N tractor, and a post hole drill and drilling down into the virgin ground, then pouring a concrete pier (of course I don't know how deep we are talking about).

You could pour a flat piece of steel, bent on the bottom end, and with a hole on the top end and just gap the post with a skill saw, and drill thru it and put a bolt thru it and the hole in the flat steel.

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Paul Schultz

03-17-2007 14:43:20




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 Re: OT: Preserving Pressure treated wood posts?? in reply to Dunk, 03-17-2007 14:12:28  
Your picture is how we would have liked to do it. But, the cost of the extra concrete was a little high. What we have is something like your pic but the post goes all the way down to a footing at the base. Here is a link to a picture. With final grading the slope will be like the undisturbed area under the deck.

I guess my original post was vague. We have the posts in place already.

Paul.

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Dunk

03-17-2007 16:16:58




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 Re: OT: Preserving Pressure treated wood posts?? in reply to Paul Schultz, 03-17-2007 14:43:20  
I figger they would last 20 - 25 years (if they were ground contact treated lumber) like you are doing it. Replacement might be aggravating then.

Not sure whatcha lumber you got there.

Ifn it was mine, in 25 years, it would be someone else's problem, not mine, I plan on doing that eternal rest thing before then.

A couple of years back I had a 30 year roof put on my house, I don't plan on having to have that replaced again either.

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Frank (N.Mi.)

03-17-2007 17:49:09




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 Re: OT: Preserving Pressure treated wood posts?? in reply to Dunk, 03-17-2007 16:16:58  
Yep Dunk they look like 20-25 years to me also. I am a professional Carpenter and we work with these often. I have seen these size posts in many of our remodels. We sometimes call these "generation remodels".We work on Summer homes for the rich people in my hometown. The houses stay in the same family for several decades. The next generation gets the house and remodels it. We have removed dozens of treated posts from the 1970's. They are almost always still intact. The ground is very sandy here though. I have seen untreated 10" diameter posts from the 1970's that are also largely intact upon removal. I am thinking if it were my house, at my age (50) I'm with you---
It will be someone else's problem

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Paul Schultz

03-17-2007 18:08:25




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 Re: OT: Preserving Pressure treated wood posts?? in reply to Frank (N.Mi.), 03-17-2007 17:49:09  
Frank and Dunk,

Thanks for the advise and info. I just wanted to make sure this was OK prior to the excavator backfilling this area in a couple months.

Paul.



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