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Old 12-30-2011, 12:47 AM   #1
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fix squeaking subfloor


Dad and I are building a new subfloor in my enclosed one-car garage. Used joist hangers and 2x6's with 16 inch centers. Joists are 10' 9". We supported each of the joists in the middle with blocks screwed into the concrete and then glued and screwed to each 2x6. Everything level and seems solid.

Started glueing and screwing the 3/4 t&g osd panels down (liquid nails, 2.5 in deck screws). After 2 panels, we get a pretty noticeable creaking when walking on top.

Not sure what's causing it. Wondering if we need to block between joists, use something besides 3/4 osd or put plywood or another layer of osd on top of what we have. Planning on carpeting when subfloor is done. Maybe that will help?

Any thoughts or suggestions appreciated!
Stephen

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Old 12-30-2011, 04:08 AM   #2
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fix squeaking subfloor


You seem to be doing everything correctly.

Only thing I can think of:
When you screw down your sheets, are you doing first the perimeter and then working towards the center? That could cause a squeak by leaving bumps in the middle. Always start on one end and work towards the other end, while putting your own weight on the spot you're screwing down. For screws, I would also predrill the holes, to make sure that the sheet gets sucked all the way down against the joist.

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Old 12-30-2011, 06:40 AM   #3
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Joints are not supposed to be tight, but should have about a 1/8" gap. Too tight could cause squeaks, rubbing edges. But, if screwed at each joist, and close to the edge, that should not be a problem.
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Old 12-30-2011, 06:57 AM   #4
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I've never pre-drilled, but like abracaboom says, make sure you stand on the area you are screwing to suck it down good.

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Old 12-30-2011, 10:06 AM   #5
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We supported each of the joists in the middle with blocks screwed into the concrete and then glued and screwed to each 2x6. Everything level and seems solid.
Can you explain what this means?

I just didn't follow it like the other guys did.

Andy.
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Old 12-30-2011, 10:27 AM   #6
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Quote:
Can you explain what this means?
They have installed (too light) 2X6's for floor joists spanning 10'-9" (over spanned) but then they have added blocks to tie the center of the 2X6's to the floor, screwing the blocks to the floor.

If each panel is getting glue and the glue has had time to adhere and set up then the only other friction-point must be the end of the joists hanging in the hangers and rubbing the face of the (whatever you there). Or the seams of the panels are moving.
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Old 12-30-2011, 10:38 AM   #7
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Actually, 2 x 6 s on 16" centers just barely makes it at 10' 9" if you consider 10 lbs. dead load and 30 lbs. load using DF #2.

I don't understand if he is making aloft in the garage or if he is actually putting this new floor on the garage slab or what the heck he is doing.

Or does he mean that they installed blocking at the ends of the joists, on the conc. block walls then nailed the joists to the blocking hanging on the block walls?

All too vague.

Andy.
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Old 12-30-2011, 02:13 PM   #8
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Old 12-30-2011, 02:27 PM   #9
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They are turning the garage into living space, and building a new floor just above the concrete floor because the concrete floor looks crappy and possibly had an oil tank underneath it. Also, the new floor will be level with the rest of the floors in the house. They used wooden blocks to cut the span of the 2x6s in half.
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Old 12-30-2011, 02:41 PM   #10
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Could the joists be moving in the hangers? Are there joists with no subfloor on it? Walk on these and do you get squeaking?

Or the sheets tight to the wall and squeaking as the floor flexes.
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Old 12-30-2011, 02:46 PM   #11
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Quote:
and possibly had an oil tank underneath it
Now that might be a RED FLAG.
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Old 12-30-2011, 03:14 PM   #12
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Quote:
Originally Posted by abracaboom View Post
They are turning the garage into living space, and building a new floor just above the concrete floor because the concrete floor looks crappy and possibly had an oil tank underneath it. Also, the new floor will be level with the rest of the floors in the house. They used wooden blocks to cut the span of the 2x6s in half.
O.K. how can you be so sure of that out of the single post?

If that is so then they could have used 2x4 if they wanted and I hope they used PT and not just DF.

Hey Steve, answer some questions will ya?

Andy.
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Old 12-30-2011, 05:25 PM   #13
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Thanks guys... sorry for vagueness. Abracaboom caught it all. Garage floor slopes 2.5 inches down. Wanted to level it without pouring concrete.

Screwed 2x6's running the length of the room into the concrete (pier and beam so it runs a foot off the ground around perimeter of garage). The 2x6's are level, then used joist hangers off the 2x6's. Then put blocks in the middle of the joists to cut the span - screwed and glued into the floor and into the joists to keep it all supported and level.

3/4 t&g osb on top of that with liquid nails and screws.

Joists are anchored with 2.5 screws through the hanger into the 2x6 running the length of the room, so they're not moving. When the panels were loose on the joists (before screwing) they didn't make much noise, if any.

We didn't screw as we went though. Maybe that's the problem. Put a few screws in randomly and then started going down the row. Seems to be flexing in between the joists. We stopped after 2 to figure out what was wrong. Thinking I'll try more glue, more screws, and moving from one end to the other while driving the screws on the next row and see if that does it.

If not, what are your thoughts on putting down another layer of boards? Read somewhere that 1/2 ply might be good on top.

Thanks again!
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Old 12-30-2011, 05:48 PM   #14
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Did you cross-brace or block the joists?
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Old 12-30-2011, 07:37 PM   #15
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Quote:
Originally Posted by AndyGump View Post
O.K. how can you be so sure of that out of the single post?
I'm a carpenter.

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