When did 3/4" ply change to 5 wood and 2 particle slabs?


Cut a dado in a piece and saw particleboard instead of wood grain! Thin outer veneer then particleboard slab then 3 wood slabs then ...! What does this do to Sagulator estimates and any other routines like it? The router bit I've used in the past for 3/4" ply wasn't wide enough for the ply to fit which translates into another dimension change! Got recent ply at Lowes as no hardwood stores in Augusta area like I had in southern CALIF.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

30 years ago we were taught that the resistance of a beam to bending was larger due to the material on the outside, and its distance from the center. (the integral of the cross section times its distance from the center to be more technical). The material on the inside pretty much just stopped the material on the outside from buckling.
So, some particle board on the inside won't affect it, but being thicker will help considerably.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

At least 10 years ago.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Plywood comes in various configurations these days, and amoung them are:
Veneer core (which means that only wood gets used) Lumber core (hard to find these days) Particleboard/MDF/flakeboard core (which is what you bought)
MDF core is the cheapest which is why you will find only this type at the borg or Lowe's. You must hunt for the other stuff. Jim
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Actually what I think he has described and what I have bought is Wood outer veneer, then a single layer of MDF, then 3 Softer wood veneer ply's, then a single layer of MDF , and then the Wood outer veneer. This type of plywood seems to have a uniform thickness.
If you need lumber core, try Clarks Hardwood Lumber or Hardwood Products in Houston.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.