Plywood sub-floor
Hello all...
I have a major house renovation underway and need to source a supply of 3/4 " spruce or fir plywood for a new sub-floor. I need 45 4 x 8 sheets - does anyone have a line on plywood at a good price. Please PM if you do... Best regards Mike |
If you ae in Calgary try Lumber King. Their 3/4" T & G select fir is about 30.00 per sheet. Totem is about the same.
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If I may ask...3/4 inch for sure?? Most sub-floors are 5/8 T&G OSB and then anywhere you need tile, another layer of 3/8th's on top of that.
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we used t@g osb for a subfloor in the basement prior to laying hard wood down.
Im thinking your going to save money with OSB over plywood. |
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Grizz |
Oh I agree...3/4 ply is way better,...but at 45 sheets, also about $1,000 more expensive. OSB can sit for a good couple of weeks without deteriorating. Being a reno, I doubt weather is a factor here.
Many multi-million dollar executive homes are built with OSB without any problem. Just trying to help. |
who cares about the cost, if you planon staying in the house use the plywood. much stonger!!
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"Model building codes typically use the phrase “wood structural panel” to describe the use of plywood and osb. Codes recognize these two materials as the same. Likewise, APA the Engineered Wood Association, the agency responsible for approving more than 75% of the structural panels used in residential construction, treat osb and plywood as equals in their published performance guidelines. And wood scientists agree that the structural performance of osb and plywood are equivalent. Osb and plywood share the same exposure durability classifications: Interior, Exposure 1 (95% of all structural panels), Exposure 2 and Exterior. They share the same set of performance standards and span ratings. Both materials are installed on roofs, walls and floors using one set of recommendations. Installation requirements prescribing the use of H-clips on roofs, blocking on floors and allowance of single-layer floor systems are identical. The weights of osb and plywood are similar: 7/16-inch osb and 1/2-inch plywood weigh in at 46 and 48 pounds. However, 3/4-inch Sturd-I-Floor plywood weighs 70 pounds, 10 pounds less than its osb counterpart. Even the storage recommendations are the same: keep panels off of the ground and protected from weather. Professor Poo Chow, a researcher at the University of Illinois, studied the withdrawal and head pull-through performance of nails and staples in plywood, waferboard and osb. Chow found that in both dry and 6-cycle aged tests: osb and waferboard performed equal to or better than CD-grade plywood. The results of another independent study conducted by Raymond LaTona at the Weyerhauser Technology Center in Tacoma also showed that withdrawal strengths in osb and plywood are the same. But, while the two products may perform the same structurally, they are undeniably different materials." |
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;) |
I have been framing for over 20 years and my own commercial framing business for 13. Price aside OSB is better. Straighter, more rigid, and IMO more resilant to weather. You can span OSB on floors up to 24" on center, let me see you do that with any plywood. Old school plywood with old school glue might have stood a chance. New world new glue, Fir and Spruce delaminates way faster than OSB. I have had no call backs with OSB installation, and could not even count how many with plywood. It literly delaminates and falls apart if left to the elements for any time. I have seen OSB sheathing lay around in the elements for years and it may swell a little over the prolonged time, but fir plywood would be 1/8' planneling. Keep in mind I install 130,000 ft/2 of the stuff per project (on the floor, thats 4500 sheets) and OSB was my choice in my own house and I recommend it to everyone else. As far as sizing most floors now are 19.2 joist spacing and require 3/4. If you are installing directly on to the joists at 16" OC then 5/8" would work, 3/4" just makes it that much more rigid of a floor. Either will work, installation is most important, lots of subfloor glue evenly applied to each joist and secure it right away to pull the sheathing into the joists. Now we can get into are screws better than nails argument.
Get your self a coil nailer and pound in 2.5" ardox nails it will never move. |
We don't even know what he is doing with the plywood. If he is building a deck and is putting vinyl on it he needs select fir T&G. So until we know what he is using it for lets not tell him how to spend his money.
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Good advice
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The old standards no longer apply in structural sheathing IME. |
star building material in calgary had some cull 3/4 plywood for $18/sheet. I picked some up and had no issues with it.
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quick question for the guys in the know, if osb is so superior to plywood why do they still make plywood if it is so inferior to osb?
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Grizz |
Last time I sheeted a roof with ply, it was from a lift that had been in the weather for 6 months. What should have taken me 6 hours took me closer to 16. My cousin bought into the "plywood is better thing" and insisted we use it on his shop. He also had an irrational fear of framing staples.
If he wasn't family, I likely would have passed on that job. |
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Just like engineered joists- ever seen a 2x10 span 25' over a living room?? nope cause they cant. The new floors are all engineered joists because they are stronger srtaighter and have way more felxiblity for plumbing heating etc.. and wait for it..... they are made with OSB. The engineers recomend OSB subfloor for there joist, but what do they know. Same as me, what do I know just been installing the S*@t for 20 years. Note: a good saw blade with a consceince framer can go a long way, it is nails, concrete and foreign matter than ruins the blades way faster. |
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Some of you guys are getting to be like BC'ers were 30 years ago: "They will sell you everything they have - which isn't much and they will tell you everything they know - which is even less". So where can he get a deal on some plywood - I'd kind of like to know myself? Cheers, Jim |
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Captain Kirk of course..... Sheeshhhhh :tongue2::tongue2: Jamie |
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