Is CDX and OSB the same?

You don't have a to an expert in the industry to tell the difference between the two products so we'll keep it simple. OSB, Oriented Strand Board, is composed of chips pressed together with resin. CDX is what many people consider “real plywood” and is 3-to-8 thin plies of wood layered to form one sheet.

croatancustomhomes.com - Structural Panels: OSB vs Plywood - Croatan Custom Homes

How much weight can a roof overhang hold?

How Much Weight Can A Flat Roof Hold? California building code sets minimum standards for roof load-bearing capacity. At minimum, any roof which...

Last updated Sep 9, 2022

What does the T mean on a boundary line?

The most common marking on deed plans that relates to boundaries are 'T' marks. An entry referring to a 'T' mark is normally a statement concerning...

Last updated Oct 31, 2021

Are shed plans easy to follow?

These are! They guide you every step of the way to complete your dream shed.

Learn More »

Promotion

Which is better, OSB or CDX? It’s a question that is often asked and hastily answered. The reference point of the one answering is as important as their answer. It most often comes down to background and personal preference, not facts or statistics. This post will identify the pros and cons, characteristics, and studies of OSB and CDX. You don’t have a to an expert in the industry to tell the difference between the two products so we’ll keep it simple. OSB, Oriented Strand Board, is composed of chips pressed together with resin. CDX is what many people consider “real plywood” and is 3-to-8 thin plies of wood layered to form one sheet. The composition of the product effects its performance.

Characteristics:

OSB – OSB is machine regulated and very consistent. More so than CDX. It doesn’t have the inconsistent layers, knots, or defects. It is denser. This is a main argument for its uses as decking material for your home. You don’t get the weak parts of a sheet which causes “give” or the squeaks that occur over time. -It typically has higher shear rating making it a good choice for walls. -Can be manufactured in 9’ or 10’ panels to better tie in the floor boxes.

-OSB also absorbs water at a lesser rate. Which has advantages.

Unfortunately, the flip side is it actually holds onto moisture longer. In the past there have been issues with the sides swelling due to this absorption (and OSB has issues with returning to original thickness once the moisture evaporates). This was once a larger concern than it is today. Massive complaints have driven manufactures to improve the process and change this. CDX – CDX dries out faster. Meaning it is less susceptible to rot. It can and should be used as underlayment for tile or flooring. Although OSB can still be used, it must be thicker material to acquire the same rating. Dampness may cause swelling and separation causing poor adhesion. Additionally, the flooring contractors I use do not recommend OSB as an underlayment. The durability of CDX has made it a favorite of many for roof applications. The idea is it doesn’t show the “ghost lines” or waviness that OSB sheets had once shown on roofs.

Similarities

When it comes to wall sheathing OSB and CDX are equal in regard to “nail holding and rack resistance” according to Kevin Chung an engineer for Western Wood Product Association. On average OSB is 7% less stiff than CDX, however, OSB is stronger than CDX in shear according to a study done by University of Massachusetts. Additionally, when the APA, The Engineered Wood Association, rate plywood, it rates them as equivalents. (As they rate spans, not whether it’s OSB or CDX.) With all that said, many users are beholden to their product. From my experience and research, you can find one study that gives OSB the advantage and then another that gives CDX the advantage. With data that is very close.

Price

When it comes to price, OSB is a clear winner. It is almost always more affordable than CDX. At time of this post OSB is approximately 25% less per sheet. As you can see these products have their advantages. People have their opinions, including myself, and love to voice them, but in my research, one is not far and away superior. Studies and tests prove, they each have their strengths and are generally equivalents.

Which anchor Holds least power?

Mushroom anchors Mushroom anchors arguably have the least holding power of any popular anchor style available. They are best used for long term...

Last updated Feb 16, 2020

Which is better wood glue or liquid nails?

The quick answer: Wood glue is best used to bond two tight-fitting pieces of wood together. Liquid nails is better suited for other materials, or...

Last updated Jul 13, 2018

Can I build my own shed?

Yes, with the right plans you can build your dream shed.

Learn More »

Promotion

Do rats live in wood?

Rats looking for shelter can find their way into your garden and settle into bushes, piles of wood or grass, and eventually they might get into...

Last updated Jan 22, 2020

What is building furniture called?

Carpenters traditionally worked with natural wood and did rougher work such as framing, but today many other materials are also used and sometimes...

Last updated Sep 28, 2021

These are the Best Shed Plans!

Comprehensive and Intuitive to follow. Build That Shed!

Learn More »

Promotion

What can you put around your house to keep rats away?

5. Use Natural Deterrent Methods Spread peppermint oil, cayenne pepper, black pepper, or cloves around the home's exterior to prevent the rats from...

Last updated Apr 25, 2019

Are shed plans easy to follow?

These are! They guide you every step of the way to complete your dream shed.

Learn More »

Promotion

Which plywood is strongest?

marine plywood The answer is marine plywood. It is the strongest and toughest of all plywood on the market. High-quality glues hold the plies in...

Last updated Apr 14, 2018