JaredM Posted May 14, 2011 Report Share Posted May 14, 2011 Ok, so I know that a 2x4 doesn't measure 2" by 4" but I ordered some 1/4 oak plywood from a local lumber store a few weeks ago along with some 3/4 inch for a barristers bookcase that I'm making. Been working on it in my spare time for several weeks now and am to the point where I was going to assemble one of the cases. I double checked the plans and saw that it said 1/4 inch plywood for the case back. I went over to my sheet of supposed 1/4 inch plywood and neater it. 1/8". Looked at myreceipt and it said 1/4" so at least I didn't tell them wrong. Since theyarent open on weekends, I went to the two big box stores to see if they would have sone 2x4 sheets of 1/4 so I could continue to work this weekend. Those that were labeled 1/4 measured 1/8 as well. Am I crazy or is 1/4 inch plywood 1/8 of an inch thick in real life? Yes, I know this may be a silly question. Quote Link to comment Share on other sites More sharing options...
C_Roy Posted May 14, 2011 Report Share Posted May 14, 2011 I've done a couple projects lately that I've used 1/4" lauan ply underlayment, in my case it worked out to around 3/16" all said and done. Quote Link to comment Share on other sites More sharing options...
tombuhl Posted May 15, 2011 Report Share Posted May 15, 2011 I've never had 1/4 ply equal 1/4, but usually it is about 1/32 to 1/64 shy. 1/8 sounds wrong and evil. Quote Link to comment Share on other sites More sharing options...
JaredM Posted May 15, 2011 Author Report Share Posted May 15, 2011 I've never had 1/4 ply equal 1/4, but usually it is about 1/32 to 1/64 shy. 1/8 sounds wrong and evil. Thanks Tom. They must have delivered the wrong plywood and Home Depot must have labeled things wrong. Quote Link to comment Share on other sites More sharing options...
joestyles Posted May 18, 2011 Report Share Posted May 18, 2011 My 1/4 ply is 1/4. Just bought some the other day. I don't buy that stuff from the big stores some of their employees do not know a thing about wood some do. I like the smaller stores they know what they are about most times. Quote Link to comment Share on other sites More sharing options...
servant74 Posted May 19, 2011 Report Share Posted May 19, 2011 I have been wondering if some of the sizes are more normal 'metric plywood' sizes. Right now I have none in stock, so if someone does, could you MEASURE and let us know? If it is more 'metric' it might be better to get 'metric plywood' bits if you want to do the dado's that way. Quote Link to comment Share on other sites More sharing options...
tombuhl Posted May 19, 2011 Report Share Posted May 19, 2011 Jack, situation is that there is much variation in thicknesses between plywoods. I have and use plywood straight bits for dado and grooves and they are good to have, but you still need to verify and then at times finesse. If the ply is very close to 1/4 then a full router bit with a bit of shaving is in order, but usually the ply bits get me closer. Just don't blindly count on it. Quote Link to comment Share on other sites More sharing options...
Dave H Posted May 19, 2011 Report Share Posted May 19, 2011 plywood just like 2x4s are full dimention in the ruff once they are refined in the case of 2x4s ran through a 4 sided planner. in plywoods case they are ran through sanding machines which brings them to finished size 1/32 undersized. Quote Link to comment Share on other sites More sharing options...
PS Doff Posted December 19, 2021 Report Share Posted December 19, 2021 Plywood is an engineered laminated material and should not vary from the label thickness by more than 1/32nd of an inch when purchased (due to the absorption of moisture by the outemost layers). 1 Quote Link to comment Share on other sites More sharing options...
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