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Reducing sway on a tall deck

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Forum topic by gbarron1 posted 07-29-2014 08:11 PM 711 views 0 times favorited 14 replies Add to Favorites Watch
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gbarron1

7 posts in 665 days


07-29-2014 08:11 PM

Hi all,

I built a fort for my son last summer. With the help of an experience carpenter, I’m pretty happy with the results (photo does not show it complete) . To reduce sway, I used Y bracing attached with 6” deck screws and it’s not doing the trick. Would it be enough to reinforce with lag bolts or do I need x bracing.

Secondly, if I use x bracing, what’s preferred? One long span from corner to corner or can I make several x’s between each post? The footprint is 16’x16’ so a span from corner to corner would require several 18’ or greater boards.

Lastly, if I do make several x’s between each post, could I leave the front open above the slab without sacrificing rigidity. Eventually, I’d like to build a small shed underneath and need the access.
Thanks


14 replies so far

View john's profile

john

2319 posts in 3136 days


#1 posted 07-29-2014 08:15 PM

It is good the way it is ! Great job !

-- John in Belgrave (Website) http://www.extremebirdhouse.com , http://www.facebook.com/group.php?gid=112698715866

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splinter164

14 posts in 696 days


#2 posted 07-29-2014 08:21 PM

X bracing between posts will be adequate. Don’t use deck screws – they are too small for the shear loads. Use several 3/8” lag bolts with washers to fasten the braces.

If you have the ability to locate the X frames near the center of the structure (under the house), you may only need one X frame in each direction. I’d connect the bottom of one post over to the top of the next post. That may be all you’d need. If it is still wobbly, you could add more.

View freddy1962's profile

freddy1962

909 posts in 304 days


#3 posted 07-29-2014 08:38 PM

What splinter said. 3/8 or 1/2 lags 6” long. Pre-drill a tad under and use an impact, if possible and drive them home. You could hide the bracing within your storage shed frame-up on 3 sides and leave one open for the doorway. Nice fort Dad! Looks like a cool neighborhood hangout.

-- JEFF Illinois (Banks of the Mississippi)

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joeyinsouthaustin

1286 posts in 827 days


#4 posted 07-29-2014 10:18 PM

I concur with op+ 1and2. It is not the bracing, but the type of fastener. I use Timberlok, and Headlock lags from fastenmaster right now. No pre drilling. Very good stuff.

-- Who is John Galt?

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Grandpa

3213 posts in 1430 days


#5 posted 07-29-2014 11:39 PM

I want to take a different stand. The bracing shown is too short. If those boards were longer they would brace the entire length of the post. those are only a couple of feet long and they only stiffen that much of the post. The screws used will make a lot of difference but on the sway. The screws will break if they are deck screws. Nails will not break. Normally lag screws will hold the best. Bolts and flat washers are good. Use flat washers to keep the heads from digging in.

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freddy1962

909 posts in 304 days


#6 posted 07-30-2014 12:21 AM

Hopefully I wasn’t misunderstood. The bracing does need to be longer like splinter stated…and use lag bolts. I agree with grandpa also about the washers. That screw looks like a good one joey, but it wouldn’t be a good one for this application.

-- JEFF Illinois (Banks of the Mississippi)

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gbarron1

7 posts in 665 days


#7 posted 07-30-2014 12:36 AM

Thanks all. I’ll go with x braces between posts with lags as suggested.

View REO's profile

REO

676 posts in 829 days


#8 posted 07-30-2014 02:01 AM

actually he ledger locks that Joey suggested are superior to plain lags in pullout and splitting with or without pre drilling the hole for the lag. they are not just a glorified Sheetrock screw and they are specifically engineered for use in this type of construction.

View firefighterontheside's profile

firefighterontheside

5917 posts in 611 days


#9 posted 07-30-2014 02:15 AM

When you get around to building the shed below, if you stud it up and then put plywood on, then the braces will no longer be needed and then you will be able to have your doors without sacrificing rigidity. That’s a cool fort.

-- Bill M. I love my job as a firefighter, but nothing gives me the satisfaction of running my hand over a project that I have built and just finished sanding.

View joeyinsouthaustin's profile

joeyinsouthaustin

1286 posts in 827 days


#10 posted 07-31-2014 06:37 PM



Hopefully I wasn t misunderstood. The bracing does need to be longer like splinter stated…and use lag bolts. I agree with grandpa also about the washers. That screw looks like a good one joey, but it wouldn t be a good one for this application.

- freddy1962

Thanks for the backup REO That whole line was in fact developed for exterior decking situations.n They are all rated and tested for code. They make a GREAT thru bolt as well. As long as 3 4X members without predrilling, and without getting out the rachet!! I just finished rebuilding and stabilizing a 20,000 square foot cedar deck. The whole line is exceptional in every way.

-- Who is John Galt?

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Ocelot

666 posts in 1393 days


#11 posted 07-31-2014 08:53 PM

As firefighterontheside said, if you are going to make a shed below, and the span is less than 8’, you can span it with plywood or even OSB siding and it will stiffen the structure wonderfully.

It looks longer than 8’. You can make longer plywood using scarf joints as shipwright shows on one of his boat builds. You would have to ask him if such a joint is strong enough for this application.

Best scarf post…
http://lumberjocks.com/shipwright/blog/25384

Another one…
http://lumberjocks.com/shipwright/blog/19783

-Paul

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splatman

83 posts in 154 days


#12 posted 08-01-2014 08:20 AM

Try adding longer braces parallel to the ones you already have; double braces. Or, build your shed now; that’ll stiffen ‘er up real good.
X braces would seem to be hard to get around (ducking, stepping over, etc.), especially when used in more than a few places. Or use X braces only where you will build your shed; remove them when you build the shed.

View dhazelton's profile

dhazelton

1290 posts in 1051 days


#13 posted 08-01-2014 12:35 PM

“I built a fort for my son last summer….” Admit it – you built the treehouse YOU always wanted.

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joeyinsouthaustin

1286 posts in 827 days


#14 posted 08-01-2014 02:07 PM



“I built a fort for my son last summer….” Admit it – you built the treehouse YOU always wanted.

- dhazelton

Ha ha.

-- Who is John Galt?

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