Trestle bench engineered enough?

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Forum topic by LiveEdge posted 02-24-2014 03:54 AM 640 views 0 times favorited 1 reply Add to Favorites Watch
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476 posts in 1040 days

02-24-2014 03:54 AM

I’ve been drawing up some plans to make a pair of trestle benches and while working on the dimensions I wanted some opinions on whether they are engineered enough for weight in the middle and for side to the side movement.

The bench is 42” in length and the legs will probably be 38” outside to outside. I was planning on two 5/4 or 4/4 boards for the seat with one sitting on the legs and the other directly on top with some extra length.

I was planning on the ties between trestles being maybe 1.5×1.5 (two S4S 1×2 glued together) with through tenons glued but not wedged.

One question is whether the upper tie should be flush with the top of the leg so as to add some more support for the bench wood? I could accomplish that by making that tie more rectangular than square.

Thoughts? Here’s a picture. The wood will be alder.

Link to the bench

1 reply so far

View Mark Kornell's profile

Mark Kornell

1057 posts in 1951 days

#1 posted 02-24-2014 07:31 AM

Sagulator says 4/4 alder would sag 0.04” over a 35” unsupported span with a 500 lb load. Assuming load was spread evenly over both boards. That’s probably fine, although I’d probably go for 5/4 or even 6/4 as it would simply look sturdier.

-- Mark Kornell, Kornell Wood Design

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