Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here


Plywood Vertical Load Capacity

Plywood Vertical Load Capacity

Plywood Vertical Load Capacity

Supports are at 12" o.c.
3/4" T&G, 5-ply, 5-layer plywood
Where can I find a load capacity for plywood.
If I put two layers down, does this double the load capacity?

RE: Plywood Vertical Load Capacity

Maybe - what load can the supports hold.  You say vertical load?? Is this like a floor or a wall??

Go see APAwood.org for more info

RE: Plywood Vertical Load Capacity

As MtE said, you will almost double the capacity of the plywood(due to the dead load reduction of the second sheet of plywood), but not necessarily the structural system supporting the vertical loads as you have to also check the supporting joists, beams, columns, any bearing studwalls, and footings.    

Mike McCann
MMC Engineering
Motto:  KISS
Motivation:  Don't ask

RE: Plywood Vertical Load Capacity

This is all new construction.
The supporting members and footings will be designed to support the load - whatever it is.

Owner is asking for at least 100 psf would like 150 psf live load.
I am shooting for whatever I can get with two layers of plywood.

Floor joists will be size & spaced accordingly.
Wall studs will match spacing of floor joists
Footing will be sized for the dead load and live load of what it is supporting

RE: Plywood Vertical Load Capacity

Sounds reasonable at 150 psf - just double check at APAWood.  Might want to glue and screw.

Also - make sure he is not running steel wheeled carts on this.  Those will eat plywood - layer by layer.

RE: Plywood Vertical Load Capacity

Consider orientaing the long axis (8-foot dimension)  perpendicular to the supports to achieve maximum stiffness, stagger joints, glue, joint bracing system, reduced joist spacing, reduce allowable joist defection and use solid blocking. Use a tight screw (or ring shank nail) pattern to reduce chance for squeaks.  Follow end panel spacing requirements. 7/8" and 1" plywoods are available with custom orders.  Attached is a teco plywood design guide,

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close