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Easy question: how would you join these 2 boards?

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Forum topic by huyz posted 03-13-2016 05:59 AM 844 views 0 times favorited 14 replies Add to Favorites Watch
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huyz

58 posts in 558 days


03-13-2016 05:59 AM

Topic tags/keywords: picnic bench sketchup

Hey lumberjocks!

I’m following a picnic table plan I found on the sketchup site and had a question.

How would you join the truss braces underneath to the top cross support to be the most stable? I’ve included two screen caps and highlighted the two boards in question.

I don’t want to use screws from the top since it will throw off the symmetry with other boards. So, somehow from the bottom.

Thanks!



14 replies so far

View conifur's profile

conifur

955 posts in 848 days


#1 posted 03-13-2016 06:23 AM

Screws, if i understand your question and pics, they would go into it horizontally on the upper and lower and lower joint, threw the angled support to there mating piece.

-- Knowledge and experience equals Wisdom, Michael Frankowski

View daddywoofdawg's profile

daddywoofdawg

1017 posts in 1272 days


#2 posted 03-13-2016 06:28 AM

drill a hole horizontal though the (2×4) into the cross brace, then lag bolt,then repeat for the bottom.where the red/black line is.

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conifur

955 posts in 848 days


#3 posted 03-13-2016 06:41 AM

Ya, heavy duty treated screws/lag bolt, all the same, many more types of “screws” out there.

-- Knowledge and experience equals Wisdom, Michael Frankowski

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jerryminer

715 posts in 1138 days


#4 posted 03-13-2016 07:55 AM

You could also do this with bolts and/or all-thread:

-- Jerry, making sawdust professionally since 1976

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lew

11668 posts in 3452 days


#5 posted 03-13-2016 03:18 PM

Here’s how “Norm” did it many years ago- https://www.youtube.com/watch?v=14i46xJaRoA .

The picnic table build starts at about 8:30

-- Lew- Time traveler. Purveyor of the Universe's finest custom rolling pins.

View JBrow's profile

JBrow

1189 posts in 617 days


#6 posted 03-13-2016 04:38 PM

huyz,

It would be nice to let the diagonal braces into dados. The dados would provide a little extra strength at the joint. Water resistant glue and screws or bolts could reinforce the joints. At the top, going in diagonally with screws before installing the center board of the top would keep screws from showing on the top.

The other option I can think of is to modify the design by rotating the diagonal braces 90 degrees so that the edges are up and down. Then cut a bird’s mouth into the ends of the diagonal braces. This would allow screws or bolts to be driven from below upward into the top center lateral batten as well as diagonally. I would still use glue at these joints. The bird’s mouth could even be let into dados for a little added strength and resist twisting.

All pressure treated lumber is not the same. I mention this because it was a while before I discovered it. The lumber used for the legs should be treated for “ground contact”. Otherwise the lightly treated lumber will eventually rot. I have not found 2×4 or 2×6 pressure treated lumber rated for “ground contact” at the home center; rather theirs are typically rated “Above Ground”. It can probably be had at a lumber yard.

View lndfilwiz's profile

lndfilwiz

92 posts in 1297 days


#7 posted 03-13-2016 04:48 PM

Personally, I would use at Kreg pocket hole and screw from your center board into the brace. I would also use some Titebond III to help hold the brace.

-- Smile, it makes people wander what you are up to.

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hotbyte

967 posts in 2672 days


#8 posted 03-13-2016 04:52 PM

If you do pocket holes, use the HD jig and screws…much beefier screw!

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Snipes

131 posts in 1941 days


#9 posted 03-13-2016 05:24 PM

It’s a picnic table. Screw it like dawg says

-- if it is to be it is up to me

View MadMark's profile

MadMark

979 posts in 1149 days


#10 posted 03-13-2016 05:50 PM

Biscuits and glue or even glue alone. The piece is under a compression load and doesn’t have to resist pullout. Use exterior glue.

M

-- Madmark - Madmark2150@yahoo.com Wiretreefarm.com

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hotbyte

967 posts in 2672 days


#11 posted 03-13-2016 07:08 PM

Picnic tables are often drug around. The trailing leg would pull on the joint.


Biscuits and glue or even glue alone. The piece is under a compression load and doesn t have to resist pullout. Use exterior glue.

M

- MadMark


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jbay

1506 posts in 596 days


#12 posted 03-13-2016 07:44 PM

-- If anyone would like to see my Portfolio, PM me and I would be glad to send you the link.

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jbay

1506 posts in 596 days


#13 posted 03-14-2016 12:00 AM

-- If anyone would like to see my Portfolio, PM me and I would be glad to send you the link.

View huyz's profile

huyz

58 posts in 558 days


#14 posted 03-14-2016 07:19 AM

Thanks everyone, lots of options here. I appreciate it.

Also was not aware I’d need ground contact treated lumber for the legs.. next issue to tackle!

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