Questions You Should Know about 4 x 8 cdx plywood

12, Aug. 2025

 

4x8 Plywood Question - Fine Homebuilding

Newbie DIY question:

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I called up the local lumber store, Gray Lumber, here in Tacoma and ordered 3/4″ 4×8 T&G plywood sheathing and other lumber.  I got a written quotation including UDLX sheet.

The yard delivers 47 5/8″ net coverage plywood with a receipt that says 4×8 UDLX plywood, which matched the quotation.  I did not check the stamp on the sheet at time of delivery.  They did come up short 10 pieces of lumber which i did notice.  The sheet was really well covered with plastic and staples.  I use the stuff for a 16′ wide by 22′ long subfloor, making the unplanned adjustment to cover the full 16′ width with a glued and nailed strip at the side. Not that neat, but no big deal…

A few days later I call the sales guy to order some more stuff and right away asked about the 47 5/8 net width sheet.  At first he tells me that this is standard and all sheet is under width and to space it to obtain 48″ net coverage.  I mention the APA marking method for “sized for spacing” and that i’d expect the sheet to be space 1/8″ in the width direction.  He says he’ll call me back. 

He calls back and says that i should have started my layout to account for the under width, which he says i’m supposed to do anyhow.  I say i’m not so sure about that since the sheet is run perpendicular to the joists and could start with a corner of a sheet in the corner of the structure.  But i’m not sure and would like to learn more if he has the time.  He says he’ll call back. 

He calls back and says it’s all 47 5/8″ wide these days because everyone is using OSB.  I stay away from that.  He says i should have ordered full width sheets but that they are more expensive.  I point out to him that i did order 4×8 sheet.  I did not point out to him that i paid more than 28$/sheet, which is more than the “big box” stores sell “full width” sheet for here in town.

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I say i’d like to learn more because he’s now telling me how many years he has been in the business and recommends to me that i go to some job sites to learn about current tract home subfloor practice. 

i’m sure i must have made some sort of mistake…just not sure what.  He says he’ll call me back. 

He does.  Says they ran out of full width 4×8 UDLX and that the order entry skew is the same for both the net 47 5/8″ wide and the 48″ wide sheet and that i can talk to the owners about it since they are the ones that put in the skews.  He also says i can bring it back. Now i’m wondering what the heck this guy is trying to say, but i’m sure i’ve worn out his patience…  Really nice guy though and i think i learned something, just not sure what.

So, from the professionals (and skilled DYI’ers) out there, anyone care to point out what the heck I did wrong here?  I searched and found no discussions on the site here regarding sheet dimensions.

Anyone ever get sold 47 5/8″ net coverage 4’x8′ plywood?  What is it for?  Why would anyone want less than 48″ net coverage?  Just nit picking?

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CDX plywood Question - Fine Homebuilding