06:13AM | 04/07/05
Member Since: 12/01/03
30 lifetime posts
I had two follow up questions to a post I made a few weeks back. I am considering building a retaining wall for my gardens around the house with treated wood.

1. How long will presuure treated wood last if it comes in to contact with the ground ??

2. Is it safe ??? I saw an article on this site with some good tips - namely that as of Jan 1 , 2004 the wood should be safer.

I just bought 10 pieces of 4 x 4 x 10 at ***** for 3.50 a piece. Pretty Cheap - but is it safe ??

Any info would be appreciated. We are thinking of having kids and I want to be sure - thanks - jg1234


06:59PM | 04/26/05
Member Since: 03/09/04
32 lifetime posts
Hello jg1234,

I build many retaining walls using treated lumber. However, I only use 6" lumber minimum. I would expect new 4" lumber to last 15 years in free draining soils. you may consider filling the immediate 4" behind the lumber with a crushed stone to allow for speedy drainage. It's a pain, but you'll improve the longevity of the wood. As far as safety goes, The new treatment is considered safe. But so was the old one. Safe enough to make it and sell it to the masses. The new stuff is much safer however. If you are building planter beds, I don't think you have anything to worry about. Check your bottom course every few years for deterioration. Once the bottom course begins to rot and crumble, consider replacing the wall. That's when you'll eliminate most of your pollution concerns.

George Nicula

Brickways, LLC
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