Wood Floors

Subfloor Plywood vs OSB

The quality of your house’s subfloor determines how well the rest of the floor will hold up when in use. For this reason, a lot of focus is placed on the materials and method used to make the floor. For the materials, the most popular options are plywood and the new oriented strand board (OSB).

Plywood VS OSB
Plywood VS OSB

While OSB and plywood share many similarities, their differences are the basis of the decisions made when choosing between them. Their manufacturing methods are almost similar but OSB has more structural consistency and is cheaper than plywood. On the other hand, plywood dries up faster when both are exposed to moisture.

In making your decisions between the two, you need to focus on some specifics which determine the environment you’ll expose them to and other aspects.

Subfloor Plywood vs OSB: a Comparison

To understand how the two materials compare, we will focus on the following aspects:

1. OSB has more structural consistency than plywood

To make plywood, thin veneer strips called plies are layered on each other at angles of 90 degrees. After that, the structure is placed in a hot press then left to cool and dry.

OSB is made in almost the same way. However, pieces of veneer measuring between 3 and 4 inches are used instead of long ones. They’re layered at 90-degree angles then glued together and pressed till they make a strong structure.

The two methods, while almost similar, will yield materials with different qualities with OSB having the best possible features. For example, in a similar level of thickness, OSB will have more piece as of veneer (up to 50 pieces) than plywood.

Owing to this, the weaknesses of wood such as knots will be totally eliminated in OSB as compared to plywood. OSB is thus denser and stronger than plywood for your subfloors.

2. Plywood Dries Out Faster but OSB Absorbs Less Moisture

For wooden floors and subfloors, water and moisture are always an issue of great concern as are highly vulnerable to damage by the two. As such, the more material will resist moisture the better.

OSB and plywood offer advantages to the issue of moisture but in varying ways. For one OSB absorbs far less moisture than plywood. This is good since it allows you to notice and take corrective measures against moisture before it builds up too much and causes damage.

On the other hand, plywood dries much faster and more completely compared to OSB. That means that, when both materials are exposed to moisture in similar conditions, plywood will gain more moisture than OSB but will lose it faster as well when dried.

In making a decision purely based on how the two materials respond to moisture, you need to consider:

  • How frequently the subfloor will be exposed to moisture,
  • How often you check your subfloor for moisture,
  • How easy it is to dry the affected areas, and
  • Type of material used for the top floor (whether it’s resistant to moisture or not).

This way, you can gauge which one best suits your needs.

3. OSB is Cheaper than Plywood

Already, plywood is cheaper than most other flooring materials on the market that’s why it’s growing in popularity. However, OSB does it one better by not only having the other advantages on this list but being cheaper as well.

Whether you’re going for the low-end or high-end versions of both materials, OSB will always cost less than plywood for the same size of the material.

4. OSB is More Resistant to Delamination, But Swells at the Edges Due to Moisture Exposure

While both materials are made by laminating pieces of wood together, OSB leads to better results especially when it comes to the density of the end product. For example, when both materials are exposed to moisture, the glue used to hold plywood veneers strips is likely to fail compared to that for OSB panels.

As a result of this, OSB is favored for areas where there is a lot of humidity and moisture as it resists the moisture and doesn’t come loose with moisture in it.

The problem with OSB is that, after it’s dried up and it’s free of moisture, it’ll have swollen edges that won’t just go away. This issue is of such great concern that OSB can fail to work for most floors as it deforms the subfloor greatly.

When you have tiles, for example, they’ll appear saucer-shaped when the subfloor made of OSB swells and loses its shape due to moisture. Plywood, on the other hand, will retain its shape once dry again.

When making a decision, these aspects are what you should put into consideration. If you can overcome the weaknesses of one material over the other, you’re better off going for that material than its alternative.

Choosing between Plywood and OSB for your Subfloor

When choosing between the two materials, you should look at your current situation and try to gauge what the future will look like with that kind of floor you’ve chosen.

If your focus is on durability, go for OSB it has a more consistent and stronger structure than plywood

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