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Forum topic by EdsCustomWoodCrafts posted 12-30-2016 12:22 AM 530 views 1 time favorited 10 replies Add to Favorites Watch
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EdsCustomWoodCrafts

701 posts in 1154 days


12-30-2016 12:22 AM

I made a 2 seater bench and prospective customer will wonder if a guy weighing 350lbs would hold his weight.

I made the bench frame out of 2×4 with 2.5” screws joining the bench rails with the side frame

-- Ed


10 replies so far

View David's profile

David

74 posts in 1838 days


#1 posted 12-30-2016 01:01 AM

Ed 2×4 can stand about 65 psi and the shear strength for a 5/16 X 2.5” screw is 829 lbs pull out 1740 lbs in sidegrain and 1223 lbs in endgrain

-- http://littleredshop.net "A man that works with his hands, knows his soul" " Have Fun, Go Fast, and Take Chances for Christ's Sake!!"

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mrbob

182 posts in 380 days


#2 posted 12-30-2016 01:43 AM

Not a problem, look at the aquarium build Thread here.

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jerryminer

780 posts in 1252 days


#3 posted 12-30-2016 01:53 AM

A bench made from 2×4’s can be made to hold a ton or more—-or it can be made to fall apart under its own weight.

Not enough info.

Can you post a pic?

-- Jerry, making sawdust professionally since 1976

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EdsCustomWoodCrafts

701 posts in 1154 days


#4 posted 12-30-2016 02:22 AM

Here are a few images

-- Ed

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EdsCustomWoodCrafts

701 posts in 1154 days


#5 posted 12-30-2016 02:24 AM

So it would hold the weight of a 360lb man???

-- Ed

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jerryminer

780 posts in 1252 days


#6 posted 12-30-2016 03:05 AM

First, let’s turn those pic.s right-side-up:


Now, to answer your question:

You’re probably fine. There are a couple things involved here:

1. The “beam strength”—or sag factor—of the horizontal 2×4. You should be fine.
2. The connection of the “beam” to the leg. We can’t see the connection, but a single screw—as noted by David above—- can handle a lot of shear load. You’re probably fine here, too, but I like to design the joints so the wood takes the load and doesn’t depend so much on the hardware. Screws rust, wood shrinks, loosening connections….

Does your 350 lb. client have enough width in the seating area?

-- Jerry, making sawdust professionally since 1976

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EdsCustomWoodCrafts

701 posts in 1154 days


#7 posted 12-30-2016 03:22 AM



First, let s turn those pic.s right-side-up:


Now, to answer your question:

You re probably fine. There are a couple things involved here:

1. The “beam strength”—or sag factor—of the horizontal 2×4. You should be fine.
2. The connection of the “beam” to the leg. We can t see the connection, but a single screw—as noted by David above—- can handle a lot of shear load. You re probably fine here, too, but I like to design the joints so the wood takes the load and doesn t depend so much on the hardware. Screws rust, wood shrinks, loosening connections….

Does your 350 lb. client have enough width in the seating area?

- jerryminer


Thanks buddy I’m not sure why my iPhone does that to the pictures sometimes

Absolutely Does not have enough room I’ll have to custom make it andcto be honest I might use bolts to assemble the seat frame and attach it to the side frame as well

Thanks a lot

-- Ed

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becikeja

813 posts in 2624 days


#8 posted 12-30-2016 01:42 PM

Just make sure the cross piece rests on the leg and you should be fine. Might want to add a center leg, then you would have no issue at all.

-- Don't outsmart your common sense

View devann's profile

devann

2246 posts in 2503 days


#9 posted 12-30-2016 01:52 PM

Add 2×4 blocks doubling the leg thickness below the seat.

-- Darrell, making more sawdust than I know what to do with

View splintergroup's profile

splintergroup

1626 posts in 1033 days


#10 posted 12-30-2016 03:21 PM

It looks like butt joints between the seat and sides, your bench could fail to racking. I’d figure out a way to correct this, maybe diagonal braces in the corners, even better if they are morticed in.

As for the 2×4’s they should be plenty strong.

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