3/4 Tongue & Groove plywood or T&G OSB

[buckeyefarmer]

Re: 3/4 Tongue & Groove plywood or T&G OSB

It would certainly make layout harder than necessary but I don't see any other reason why it shouldn't be done.

You would need to double every 4', lots of extra unneeded joists.

If first row is 8', 8', 8', etc, 2nd row starts 4', 8', 8' etc.., 3rd row repeats 1st, 8', 8', 8' etc... 4th row repeats 2nd row.... And so on.

 

[Snobdds]

The breaks should be on the length of the sheet and not the width, so every 4 or 8 feet as buckeyefarmer stated. The weird width is of no consequence as any extra width will be chalk lined and cut off on the final row.

I don't know why so many are concerned about the width of the sheet, the length is what matters and they should be 8 feet exactly.

 

[Lineman North Florida]

Re: 3/4 Tongue & Groove plywood or T&G OSB

Next row Sheets should be staggered, to cover 1/2 each of previous rows. Doubling every 8' throws everything off. If i had a builder do that to me, id fire him immediately. If i saw it in a house i was looking to buy, i wouldnt buy it, I would wonder what else is framed wrong...

Not being smart but maybe I don't understand what you are saying when you say doubling the joist every 8' throws everything off, this is a hunting camp and I realize that my floor joints will all be in a straight line every 8' they will be landing on a full 1&1/2 joist rather than 3/4 butted on the same joist, I'm not a carpenter but I don't understand how this will throw everything off.

 

[GLyford]

It "throws everything off" if you stagger the joints as per common practice in a "brick" pattern. Doing that makes the overall floor stiffer and reduces the chance that joist movement will cause finished flooring to flex over where the ends meet (visible buckle in vinyl, cracks in tile, gaps showing in hardwood).

If you don't care if a line shows every 8 feet then it doesn't matter. More of a "finished" building practice thing.

 

[fried1765]

Re: 3/4 Tongue & Groove plywood or T&G OSB

Next row Sheets should be staggered, to cover 1/2 each of previous rows. Doubling every 8' throws everything off. If i had a builder do that to me, id fire him immediately. If i saw it in a house i was looking to buy, i wouldnt buy it, I would wonder what else is framed wrong...

Agreed......but some DIY people simply don't know.

 

[/pine]

If a quality sub flooring adhesive is applied correctly the plywood breaks are of no real concern...
diagonal bridging or solid blocking should be installed on any span over 12' to help distribute the load...

The layout should be pulled on the leading edge of each course of plywood to keep them O/C...

Seems to be a lot of amateur carpenters chiming in...

 

[Snobdds]

If a quality sub flooring adhesive is applied correctly the plywood breaks are of no real concern...
diagonal bridging or solid blocking should be installed on any span over 12' to help distribute the load...

The layout should be pulled on the leading edge of each course of plywood to keep them O/C...

Seems to be a lot of amateur carpenters chiming in...

That is amateur right there...

 

[buckeyefarmer]

Re: 3/4 Tongue & Groove plywood or T&G OSB

Not being smart but maybe I don't understand what you are saying when you say doubling the joist every 8' throws everything off, this is a hunting camp and I realize that my floor joints will all be in a straight line every 8' they will be landing on a full 1&1/2 joist rather than 3/4 butted on the same joist, I'm not a carpenter but I don't understand how this will throw everything off.

Joists are no longer at a common "on center". It affects having standard bridging lengths, where you nail or screw on the subfloor, and creates joint lines. Will it work? Sure will. If its a hunting cabin, not too big a deal, just not standard practice.

Staggering rows makes a tighter, stronger floor, interlocks the joists together. Ending a sheet in the middle of a joist is not a problem, if the next sheet is staggered. Pound the tongue into the grove. Use a 2x4 against the grove side when pounding, to protect it.

 

[/pine]

Some of you goofs are too much...we are talking about a very basic floor system...exactly where are all the stress/forces that all the staggering and joint spacing is supposed to add support for supposed to come from???

...That is amateur right there...

I held an active class A GC lic. in FL for over 45 years...and what is it you do?

 

[Lineman North Florida]

I guess the only problem that I really see with the double joist at 8' will be that if those 2 joists are not true with each other it could cause me some grief, but I believe I can take a plane and true any of that up. I actually plan on putting down some underlayment and some sort of wood laminae for my finish flooring.