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Old 04-07-2017, 08:53 PM   #16
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Re: Seeking tips on building parallelogram boxes to support new subfloor....


the reasoning for not fastening deeper than 1" into a joist when putting down subfloor is done so as a precautionary step so to not drive a screw through any pipes or wires that are closer to the top of a joist
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Old 04-20-2017, 10:15 PM   #17
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Re: Seeking tips on building parallelogram boxes to support new subfloor....


It's been a while and I'm finally getting around to installing my floors for good.

I'm thinking I lay the first layer down as pictured below lengthwise. The second layer of advantech will be laid down perpendicular to the first layer. That way the seams are not in the same spots.

Does that make sense?




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Old 04-22-2017, 10:56 AM   #18
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Re: Seeking tips on building parallelogram boxes to support new subfloor....


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Originally Posted by jaketrades View Post
When sistering 2x4s onto joists what's the appropriate screw depth into the joists. 1/2" or 1"? The studs are 1.5" so trying to decide between 2.5" vs 2" screws.
Sistering joists together we usually shoot 3" nails with a nail gun. Screws I'd go the same, 3" if you're not going to overdrive them. 2 1/2 should be fine too. Just make sure you're not using some kind of drywall screw that can snap easily. Nails can bend, so they don't just snap the first time there's some force put on them.

When you're putting down your subfloor there's a general rule of thumb, and like all general rules there are a lot of cases it doesn't apply, but usually the length of the screw should be 3 times the thickness of what you're screwing down. So 3/4 ply gets a 2 1/4 screw, 1/2 gets 1 1/2 screw. As has been mentioned before, you have to adjust if there's any kind of pipes or wires running through there so you don't have a flood/shock while screwing your subfloor down.
For subfloor you should use some construction adhesive as well to eliminate squeaks.

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