Home |
Search |
Today's Posts |
|
Home Repair (alt.home.repair) For all homeowners and DIYers with many experienced tradesmen. Solve your toughest home fix-it problems. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
#1
Posted to alt.home.repair
|
|||
|
|||
plywood subfloor question
the carpet guy was replacing some carpet. it's laid down on a plywood subfloor. i noticed one gap in the laid down panels that you could peek into the basement thru. you could also get a ruler thru the gap & measure the plywood thickness. i was shocked to realize it wasn't that thick. the panels are stamped 23/32, and tongue and groove - google'ing it - it seems the 23/32" is the same as 3/4 - but these panels are NOT even close to being 3/4" thick ... now i must be missing something here in the way thickness is depicted. should the panel really be 3/4" thick (ie. measured on a ruler), or is there some "trade" custom in measurements of plywood subfloor thickness that is used ? i would imagine an actual 3/4" thick plywood panel would be a very heavy dead load on the joist. it actually measured on the ruler a little less than 1/4" thick - and the blueprints call for a standard 40 psf load limit. |
#2
Posted to alt.home.repair
|
|||
|
|||
plywood subfloor question
the panels should indeed be 3/4" (well, actually 23/32) measured on a
ruler. Are you sure you are measuring the full sheet, and not bumping the tongue with your ruler or something? if it was actually 1/4" thick, you would definitly notice the flimsyness and there would be bellies between the joists. |
#3
Posted to alt.home.repair
|
|||
|
|||
plywood subfloor question
You may be confusing the structural deck and the underlayment.
TB |
#4
Posted to alt.home.repair
|
|||
|
|||
plywood subfloor question
If it was 24/32 then it would be exactly the same as 3/4. So 23/32 is
just 1/32 thinner than 3/4 and a big difference from 1/4. |
#5
Posted to alt.home.repair
|
|||
|
|||
plywood subfloor question
"marson" wrote in message oups.com... the panels should indeed be 3/4" (well, actually 23/32) measured on a ruler. Are you sure you are measuring the full sheet, and not bumping the tongue with your ruler or something? if it was actually 1/4" thick, you would definitly notice the flimsyness and there would be bellies between the joists. well, there was a small gap in between 2 panels, and i could stick a ruler into the gap (and could peek thru it to see the basement). so when i stuck the ruler into the gap, and measured the plywood thickness at that gap edge, it was about 1/4" or so. but yet the plywood panel underneath is stamped 23/32, tongue & groove. the panels are all flat and don't seem to be flimsy, so it's a mystery that made me ask if i'm measuring it wrong. so if it really was 1/4" thick, i'd know it for sure ?? the joists are 2x10's 16" o.c. (and some areas are double and triple joisted, and there are wood cross braces in between most of them - there's a fireplace in the same room) with those plywood subfloor panels. |
#6
Posted to alt.home.repair
|
|||
|
|||
plywood subfloor question
You should measure the plywood by putting your ruler down into the gap so
that it touches the top of the joist, then measure the thickness to the surface. I am sure it will measure close to 3/4". wrote in message oups.com... If it was 24/32 then it would be exactly the same as 3/4. So 23/32 is just 1/32 thinner than 3/4 and a big difference from 1/4. |
#7
Posted to alt.home.repair
|
|||
|
|||
plywood subfloor question
Some subfloor is 5/8" thick panels. I would be more concerned with be able
to peak into the basement. Sounds like somebody went off layout. I would nail a 2X4 alongside the joist then nail the panel down. "duckdude" wrote in message ... the carpet guy was replacing some carpet. it's laid down on a plywood subfloor. i noticed one gap in the laid down panels that you could peek into the basement thru. you could also get a ruler thru the gap & measure the plywood thickness. i was shocked to realize it wasn't that thick. the panels are stamped 23/32, and tongue and groove - google'ing it - it seems the 23/32" is the same as 3/4 - but these panels are NOT even close to being 3/4" thick ... now i must be missing something here in the way thickness is depicted. should the panel really be 3/4" thick (ie. measured on a ruler), or is there some "trade" custom in measurements of plywood subfloor thickness that is used ? i would imagine an actual 3/4" thick plywood panel would be a very heavy dead load on the joist. it actually measured on the ruler a little less than 1/4" thick - and the blueprints call for a standard 40 psf load limit. |
#8
Posted to alt.home.repair
|
|||
|
|||
plywood subfloor question
"duckdude" wrote:
"marson" wrote in message roups.com... the panels should indeed be 3/4" (well, actually 23/32) measured on a ruler. Are you sure you are measuring the full sheet, and not bumping the tongue with your ruler or something? if it was actually 1/4" thick, you would definitly notice the flimsyness and there would be bellies between the joists. well, there was a small gap in between 2 panels, and i could stick a ruler into the gap (and could peek thru it to see the basement). so when i stuck the ruler into the gap, and measured the plywood thickness at that gap edge, it was about 1/4" or so. but yet the plywood panel underneath is stamped 23/32, tongue & groove. Tongue & groove means the edge of the plywood, at the mill, has a 1/4" cut in the top and bottom sides, leaving the middle 1/4" to stick into the slot cut in the other edge of the next sheet of plywood. So if you have a slight gap between the sheet, but not enough to expose the whole edge, you could measure just the top cut on the T&G. It makes for a stronger joint to have the two pieces interlock. -- NewsGuy.Com 30Gb $9.95 Carry Forward and On Demand Bandwidth |
#9
Posted to alt.home.repair
|
|||
|
|||
plywood subfloor question
you could try removing a floor register and measuring there.
"duckdude" wrote in message ... "marson" wrote in message oups.com... the panels should indeed be 3/4" (well, actually 23/32) measured on a ruler. Are you sure you are measuring the full sheet, and not bumping the tongue with your ruler or something? if it was actually 1/4" thick, you would definitly notice the flimsyness and there would be bellies between the joists. well, there was a small gap in between 2 panels, and i could stick a ruler into the gap (and could peek thru it to see the basement). so when i stuck the ruler into the gap, and measured the plywood thickness at that gap edge, it was about 1/4" or so. but yet the plywood panel underneath is stamped 23/32, tongue & groove. the panels are all flat and don't seem to be flimsy, so it's a mystery that made me ask if i'm measuring it wrong. so if it really was 1/4" thick, i'd know it for sure ?? the joists are 2x10's 16" o.c. (and some areas are double and triple joisted, and there are wood cross braces in between most of them - there's a fireplace in the same room) with those plywood subfloor panels. |
#10
Posted to alt.home.repair
|
|||
|
|||
plywood subfloor question
According to John Hines :
Tongue & groove means the edge of the plywood, at the mill, has a 1/4" cut in the top and bottom sides, leaving the middle 1/4" to stick into the slot cut in the other edge of the next sheet of plywood. [Or the reverse ;-)] So if you have a slight gap between the sheet, but not enough to expose the whole edge, you could measure just the top cut on the T&G. It makes for a stronger joint to have the two pieces interlock. Indeed. It's also possible he's seeing a ripped off edge that doesn't quite meet, and has been undercut by a chunk split out of the underside of the ply. In any event, 1/4" floor sheathing would be more than flimsy. If you stomped on it, there's a good chance of going through. You'd get a very queasy feeling walking on it. -- Chris Lewis, Una confibula non set est It's not just anyone who gets a Starship Cruiser class named after them. |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Attaching plywood to plywood for ceramic tile? | Home Repair | |||
How to flatten plywood (or does it matter)? | Woodworking | |||
Windsor Plywood Scam - Saskatoon | Woodworking | |||
Solid wood, veneer over mdf or plywood | Woodworking | |||
Plywood vs. hardwood for walnut bookcases | Woodworking |