They stopped using arsenic in the US to treat wood in 2003.I dont know whether we are on the same standard both sides of the border but there was quite a change over here in regard to arsenic content. I dont know what the common formulation is now but it is less bad! Probably the most meaningful exposure would be via sawing etc., when we build with it.
Where'd you get those leveling feet? I like those!Both. The stand platform is not in contact with the ground so use regular lumber. Use treated lumber for legs that are in contact with the ground.
Here is something to think about instead.
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This stand doesn't make contact with the ground, it sits on leveling bolts and the leveling bolts can sit on pavers or cinder blocks. It is made from 2x6 Douglas fir. The leveling bolts pass through a nut embedded in the cross member and epoxied in place. I use 4" [test caps](https://www.homedepot.com/p/Oatey-4-4-in-ABS-DWV-Insert-Test-Cap-with-Knockout-39103/100113503) for grease cups. Small screws secure the grease cup in place over the level bolt. Leveler bolts are 6" long with 1/2-13 thread. Cross members are joined to the rails with 6" lag bolts. Be sure to drill a pilot hole that is the diameter of the lag bolt shank so it doesn't split the cross member. I've now made four of these since my first one a few years ago and they work well at keeping the ants out of the hives. it'll be the basic pattern of all my new hive stands now. Ants can climb up the level bolts but that is as far as they can get. (Weeds or other items in contact with the stand nullify the stand). The stand will hold up to three hives. I finished them with four coats of boiled linseed oil, which takes a couple of weeks in the sun to cure before using. BLO is a finish that has to be renewed in about four years, but it is easy to renew. The grease is just whatever axle grease is the cheapest, and it needs to be renewed after about two years.
I try to avoid treated lumber. I would use cedar, redwood, or cypress, depending on what was to hand.Looking to build a couple of hive stands and was wondering if it was ok to use treated lumber or go with untreated. I was thinking that treated might effect the hive from fumes that come off the wood.
The levelers are just 6" bolts, 1/2" diameter, that run through the nut embedded in the cross member. That stand in the photo is sitting on granite posts but anything else works fine. The steel leveler bolt is what holds it up and the only path for ants to climb onto the stand is to ascend the leveler bolt where it runs into the grease cup.Where'd you get those leveling feet? I like those!