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Tool Talk Discussion Forum

Pressure Treated landscape timbers

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Steve-Maine

01-12-2020 16:01:52




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How long before landscape timbers will start rotting.




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dbnga

01-17-2020 22:40:45




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 Re: Pressure Treated landscape timbers in reply to Steve-Maine, 01-12-2020 16:01:52  
I heard/read years ago that "off the shelf treated lumber for ground contact has to be 4 x" I'd still look at the label on 4x4s for preservative content.



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jaoneill

01-14-2020 17:47:28




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 Re: Pressure Treated landscape timbers in reply to Steve-Maine, 01-12-2020 16:01:52  
Ground contact is commonly called "foundation grade" and is labeled .60 as opposed to your everyday big box store .40 PT, which is near worthless and also usually SYP, which is garbage wood to begin with. Untreated larch or locust will last much longer.



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showcrop

01-13-2020 04:28:15




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 Re: Pressure Treated landscape timbers in reply to Steve-Maine, 01-12-2020 16:01:52  
There are some options out there. Thirty years ago I installed some actual oak railroad ties as a retaining wall. It is still retaining the dirt.



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MarkB_MI

01-13-2020 04:23:27




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 Re: Pressure Treated landscape timbers in reply to Steve-Maine, 01-12-2020 16:01:52  
It depends a lot on climate, but in my experience, the cheap landscape timbers are only good for a couple of years. I think they're actually a byproduct of plywood manufacturing; they're the cores of logs after the useful veneer has been cut off. Having used landscape timbers once, I'll never use them again.

If you want something that's in contact with soil to last, it needs to be constructed of pressure-treated wood that's rated for GROUND CONTACT. Check the label on the end of the board; most treated lumber you'll find at a big-box store will not be rated for ground contact. Ground contact-rated lumber should last for decades in even the most severe conditions.

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Mule Meat

01-13-2020 04:00:26




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 Re: Pressure Treated landscape timbers in reply to Steve-Maine, 01-12-2020 16:01:52  
Quoting Removed, click Modern View to see

They start rotting the minute you expose them to the weather. To many variations come into play to give an accurate time frame for in which the rot to become noticeable.
Not many people here use treated post any longer for pole barn type construction. Laminated pressure treated 2 bys have taken over.

===

I have always thought that there could be a market for plastic landscape timbers, boarders etc by recycling all of the plastic bottles, bags and such products. I know some places have been testing rail road ties made from recycled plastic.

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Tony in SD

01-13-2020 03:06:50




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 Re: Pressure Treated landscape timbers in reply to Steve-Maine, 01-12-2020 16:01:52  
The have already "STARTED” to rot. When will the exceed their useful life depends on how many wet/dry cycles they are exposed to.



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Billy NY

01-13-2020 02:40:27




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 Re: Pressure Treated landscape timbers in reply to Steve-Maine, 01-12-2020 16:01:52  
I don't have any confidence in ACQ pressure treated lumber for ground contact. CCA (copper chromated arsenate) is a much better preservative, just not so easy to get, but is allowed for Ag and Industrial applications. Also depends on your ground conditions. I used CCA lumber for sill plates onto compacted gravel for a set of front porch stairs I built for a neighbor in '96, they are still there today, stairs and sill plates.

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John in La

01-12-2020 18:53:20




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 Re: Pressure Treated landscape timbers in reply to Steve-Maine, 01-12-2020 16:01:52  
I have not ever seen real pressure treated landscape timbers.
Yes they may dip them or pressure treat them to a chemical retention level of .01 lb per cu ft with MCA but that is not real pressure treating.
Any cut or scrape will revel untreated wood.

In comparison box store 2x4's are pressure treated to a chemical retention level of .15 lb per cu ft with MCA and at that level it barely meets ground contact levels.

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old

01-12-2020 16:16:17




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 Re: Pressure Treated landscape timbers in reply to Steve-Maine, 01-12-2020 16:01:52  
You will be lucky if you get 10 years out of them if even that long



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pburchett

01-12-2020 16:09:51




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 Re: Pressure Treated landscape timbers in reply to Steve-Maine, 01-12-2020 16:01:52  
The last ones I bought at Walmart were not pressure treated, they were dipped. Went to Lowes and they had the same dipped timbers. I would not have known but I happened to look at the tag that was stapled to the end. I would give the dipped one just a year.



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Heyseed

01-12-2020 16:20:57




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 Re: Pressure Treated landscape timbers in reply to pburchett, 01-12-2020 16:09:51  
If they are ground contact PT you can get 20 years, it does help if the grade doesn't let water puddle on them.



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JDBRIDER

01-12-2020 18:49:19




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 Re: Pressure Treated landscape timbers in reply to Heyseed, 01-12-2020 16:20:57  
When I need pressure treated I never buy anything thicker than 1 1/2 inch then double or triple them up. Seems the thicker stuff rots from the middle like the treatment doesn't reach center.



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