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RockyMtnBlue 11-24-2012 04:25 PM

Blocking on deck joists
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Building a 16x24 deck, 16' joists attached at ledger and supported by 2 beams at about 7' and 14' from ledger. I currently have solid blocking at about 4' and 11'. Do I need more blocking?

Wuzzat? 11-24-2012 04:56 PM

Here's a starting point

RockyMtnBlue 11-24-2012 05:03 PM


Originally Posted by Wuzzat?

Thanks for that reference... Seems I'm OK.

inspectorD 11-24-2012 07:18 PM

Looks good! So what's goin on for the decking material?:D

Wuzzat? 11-24-2012 07:19 PM


Originally Posted by RockyMtnBlue (Post 80413)
Thanks for that reference... Seems I'm OK.

". . .blocking is also required every 8 feet for 2x10 and taller joists."

Your joists don't look like they're 10" or higher, so for shorter joists do we need more or less blocking? Shorter joists may be less likely to twist, but that's just a guess. I'd like to see a rule or a formula.

RockyMtnBlue 11-24-2012 10:51 PM

Wazzat.... Like you, Im assuming that smaller joists would be less liable to twist and that blocking every 8 feet is adequate.

RockyMtnBlue 11-24-2012 10:52 PM

InspectorD, 5/4 x 6 treated is the plan.

RockyMtnBlue 11-25-2012 02:36 PM

Hmm, I can get 5/4 x 6" cedar for a little more than PT. I like the looks of cedar and the fact that it will take a stain better than PT.

I plan on re-treating the decking every two years... Whether its PT or cedar.

What comments/experiences do others have related to these two decking choices?

inspectorD 11-25-2012 02:55 PM

I prefer the cedar cause it just looks nicer. The railings are a bit more stable and have a softer look and feel. My deck is cedar, it holds up just fine to furniture and traffic. I used stainless fasteners on all the railings so it did not get the black marks through the boards. The screws I hid underneath for the decking called blind screwing(leave it alone Oldog:p).

There are plenty of materials today, I still like plain Ol, inexpensive cedar.
Treat or seal all ends of all cuts no matter what material you use.
Good luck.

BridgeMan 11-27-2012 01:46 AM

Your joists do not look like they are pressure-treated lumber in the photo. Are they? If not, it's a bit of a gamble on their long-term performance, isn't it? I don't know where you live, but anywhere in the Rocky Mountains (as inferred from your screen name) will be subject to rain and (lots of) melting snow. If you're planning on flipping the property, so be it. If you plan on being there a while, you might consider applying some heavy duty preservative, like copper napthanate, to the joists before installing the decking.

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