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Question on fastening deck beam together

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Forum topic by isuhunter posted 03-10-2021 07:24 PM 693 views 0 times favorited 13 replies Add to Favorites Watch
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isuhunter

23 posts in 1391 days


03-10-2021 07:24 PM

My beam will be – 3 – 2×10’s with 2 – 1/2” treated PLY sandwiched between them to bring to the full 5.5” dimension. Now when putting the beam together, how long of screws would you use I plan to screw from both sides? 5 1/8” GRK RSS screws? Or is screwing the into the middle 2×10 just as structurally sound?


13 replies so far

View Wood_Scraps's profile

Wood_Scraps

203 posts in 351 days


#1 posted 03-10-2021 09:58 PM

I’m personally inclined to go for bomb proof and simplicity when fastening. So, I’d choose the 5 1/8” ones and call it a day.

I suppose you could opt to fasten them in a way that you end up with 2 “halves”. Then fasten those halves together. But, I’d still think the 5 1/8” screws would be best.

Whatever you decide, you’ve got the screw brand correct. Absolutely love GRK fasteners. Have tried many different brands, but always come back to the GRKs.

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tvrgeek

2303 posts in 2981 days


#2 posted 03-10-2021 10:14 PM

And glue.

You needed the beam to be that short for a reason?

View LeeRoyMan's profile

LeeRoyMan

2377 posts in 1059 days


#3 posted 03-10-2021 11:23 PM

3”- 4” from both sides.

View Knockonit's profile

Knockonit

1063 posts in 1534 days


#4 posted 03-10-2021 11:40 PM

using a pattern for screwing, same line can and will cause splits .

-- Living the dream

View CWWoodworking's profile

CWWoodworking

2311 posts in 1511 days


#5 posted 03-11-2021 12:57 AM

If your trying to clear span a long distance, steel beam wrapped in 2x’s would be easier and less bouncy.

I have a clear span 22’. Very little bounce.

View woodbutcherbynight's profile

woodbutcherbynight

10630 posts in 3741 days


#6 posted 03-11-2021 02:43 AM



If your trying to clear span a long distance, steel beam wrapped in 2x’s would be easier and less bouncy.

I have a clear span 22’. Very little bounce.

- CWWoodworking

I remember doing that on a job with my Grandfather when I was a kid. My Dad thought I was kidding when I told him about it.

-- Live to tell the stories, they sound better that way.

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LeeRoyMan

2377 posts in 1059 days


#7 posted 03-11-2021 03:01 AM

It would probably be best to drill through and use a nut and bolt with washers.

View rbrjr1's profile

rbrjr1

217 posts in 1538 days


#8 posted 03-11-2021 03:23 PM



If your trying to clear span a long distance, steel beam wrapped in 2x’s would be easier and less bouncy.

I have a clear span 22’. Very little bounce.

- CWWoodworking


it’s called a flitch beam.. usually 3/8”-1/2” steel is the sandwiched medium. if it’s an outdoor beam, I would recommend rubber flashing over the top of the beam so as to prevent the intrusion of water contacting the steel from the top when it rains.

-- only an idiot dismisses an intelligent statement because they dont know anything about the person delivering it.

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CWWoodworking

2311 posts in 1511 days


#9 posted 03-11-2021 05:27 PM


If your trying to clear span a long distance, steel beam wrapped in 2x’s would be easier and less bouncy.

I have a clear span 22’. Very little bounce.

- CWWoodworking

it s called a flitch beam.. usually 3/8”-1/2” steel is the sandwiched medium. if it s an outdoor beam, I would recommend rubber flashing over the top of the beam so as to prevent the intrusion of water contacting the steel from the top when it rains.

- rbrjr1

We used a 4×12 rectangle tube, welded closed on each end. I think the 22’ length was 600$ give or take. But it’s much easier to work with. Set it in place and build.

View isuhunter's profile

isuhunter

23 posts in 1391 days


#10 posted 03-12-2021 02:42 PM

Thanks for all of the thoughts guys – here is what we are doing – 4’ OC span for posts

View CWWoodworking's profile

CWWoodworking

2311 posts in 1511 days


#11 posted 03-12-2021 05:13 PM

Your beam is way over built. 2 2×10s is plenty. Your not gaining anything by building thicker.

Good luck.

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isuhunter

23 posts in 1391 days


#12 posted 03-12-2021 05:38 PM



Your beam is way over built. 2 2×10s is plenty. Your not gaining anything by building thicker.

Good luck.

- CWWoodworking

Completely understand more a play on aesthetics, nothing drives me more crazy than seeing decks in the neighborhood that look wimpy or getting on a deck that moves a little.

View kimballd's profile

kimballd

40 posts in 3096 days


#13 posted 03-14-2021 02:12 PM

You can get a 5 1/2” x 10” treated PSL from your local lumber yard. Don’t both with the big box stores.

Good Luck, Kimball

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