Four Steps to Protecting an OSB Board From Moisture

How to waterproof an osb floor decking?

If you’re planning on using OSB boards for decking or anything else for that matter, then you’ll need to make sure that they are protected from moisture. Moisture is the enemy of any wood product, and will cause it to rot over time. This includes your exterior projects made out of OSB board. If the project is indoors, this may not be as much of an issue; but if it’s outside, then there needs to be a plan in place for protecting the boards from moisture before starting work on your next building project!

Step One:

The first thing you’ll want to do is make sure the OSB board isn’t getting wet. This might sound obvious, but it’s easy for water or moisture from rain and snow (or even condensation) on windows in your home as well ́s insulation boards installed inside a building envelope that can cause this to occur.

Step Two:

Buy a clear sealant, like Thompson’s Water Seal. Apply this to the OSB boards before attaching them together for your project if you’re building something outside or in an area where there may be moisture present (i)nside). Step Two is is an important but optional one. However it is highly recommended.

Step Three:

Apply a second sealant, like Thompson’s Clear Wood Finish. This provides an additional layer of protection from moisture that the clear water and oil-based sprays may not be able to penetrate into because they are on top (i)nside).

Step Four:

This is recommended, especially for an exterior project where you know there will be moisture around. Apply a coat of paint or stain to the outside.

This fourth and last step is not optional at all if you’re building an exterior project, but it’s also highly recommended for indoor projects as well. It is on par with Steps One and Two in terms of them being essential when working outdoors because what you’re protecting the OSB board from is water, which can make it soft and rot quickly. If you have any doubts about whether or not there be enough moisture in your area to worry over this step for an indoor project then don’t hesitate!


The last thing that I want everyone to know when working with wood products like these boards made of OSB is that they are not indestructible. They still have to be handled with care and maintenance, because water damage will render them useless if it isn’t taken seriously from the start of a project or simply repaired as soon after water contact has been made.

Additional Online Information

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