Can you paint OSB subfloor?

Asked By: Adan Cot | Last Updated: 26th January, 2020
Category: home and garden indoor environmental quality
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Using oil-based paint is essential. Just painting the OSB like you would paint plywood will leave the OSB rougher and the paint will bleed through regular primer, while using water-based paint causes the OSB to peel over time, making it look unattractive and requiring regular maintenance.

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Subsequently, one may also ask, what kind of paint do you use on OSB?

If your OSB panels are used indoors, an acrylic latex primer will be an ideal base coat because it's so easy to work with. Latex primers are fast-drying, so they can be painted over in as little as an hour.

Subsequently, question is, can you paint subfloor? Yes, subfloor can be painted successfully and last for years. One of the ways The process was not as hard as you would think, in fact – it was pretty darn easy. I thought about painting it decoratively using a stencil, but I want the room to be simple and serene just like a yoga studio.

Also question is, can I paint OSB for exterior use?

Seal both sides of the OSB and the joints with a quality waterproofing primer. Paint the OSB with two coats of a premium exterior topcoat. Use a topcoat that will stand up to the weather in your area. OSB will fare much better when painted with a paint that protects it from the elements.

How do you weatherproof OSB?

Soak the tip of your paintbrush in your sealer and begin brushing it over the surface and on the ends of the OSB pieces. Make sure you repeat this process on each side, not just where your cuts were made. Coat the pieces as they lay on the tarp, and then let the waterproofing sit to dry for 12 to 14 hours.

39 Related Question Answers Found

Do I need to prime OSB before painting?

OSB often ships with a thin coating of wax which first needs to be stripped before painting. Older OSB will be especially porous, requiring several coats of paint plus primer. Particularly old OSB that is beginning to fall apart cannot be painted; the paint will not help glue the OSB together.

Can I waterproof OSB?

OSB is strong and water-resistant.
Every single fiber or piece of wood in an OSB is saturated with a cocktail of resins designed to provide superior strength and waterproofing to the finished product. This type of board is an excellent material for use in waterproofing systems, be they roof, sub-floor or wall.

Which side of OSB goes down?

"This side down" applies to when it's used as subflooring. That side should be facing down, against the joists. When used as wall sheathing, that side should be against the studs.

Can you seal OSB?

AFM Safe Seal Plywood & OSB Sealer. Safecoat Safe Seal is a multi-purpose, waterborne, clear low gloss primer/sealer. AFM Safe Seal adds water and moisture protection to a variety of surfaces and is virtually odorless on application and odorless once cured.

How Long Can OSB be exposed to the elements?


Exposure 1 panels have a fully waterproof bond and are designed for applications having temporary exposure to weather such as where construction delays may be expected prior to providing protection. It is not uncommon for panels to be exposed to weather for six months to a year.

Will painted OSB last outside?

3 Answers. There's no such thing. OSB will swell, warp, and degrade unless it's kept safe from sunlight and perfectly dry. No paint will do this.

Which is better plywood or OSB?

Osb is stronger than plywood in shear. Shear values, through its thickness, are about 2 times greater than plywood. This is one of the reasons osb is used for webs of wooden I-joists. However, nail-holding ability controls performance in shear wall applications.

Which side of the OSB faces out?

However, the one thing you do have to consider is that the coated side of the board should always face outward to ensure better protection from the elements. Since the opposite side is unfinished, it will absorb moisture from the weather and eventually rot.

Does it hurt to get OSB board wet?

OSB won't be completely destroyed by water, unlike MDF or similar interior laminate materials; however, like any wood product, it will swell and shrink as it absorbs and releases water, so you should typically avoid more than casual contact with water.

Is OSB a vapor barrier?


OSB wall sheathing panels are 'smart' vapor barriers as their permeance is low when relative humidity is low, but it increases as relative humidity increases in the warmer months. This allows for greater air movement which enables the wall to dry faster.

Can you sand OSB subfloor?

OSB, or oriented-strand board, is an engineered wood material sold in sheets like plywood. OSB cannot be sanded to take on a particular shape, but a light pass with sandpaper will smooth out the surface so splinters don't scratch the bottom of the material you install over the OSB.

What is the best exterior sheathing?

Plywood and OSB are largely considered the best wall sheathing choices because of their overall abilities to hold fasteners well, create a strong bond between studs, and provide some thermal advantages. The “big two” aren't the only selections available however. Structural fiberboard is one such option.

How do you seal OSB edges?

  1. Use a measuring tape to mark off the needed length and width of OSB. Cut the wood using a circular saw.
  2. Mix a can of exterior waterproof paint using a stir stick. Use a small paintbrush to coat all newly cut edges.
  3. Allow the paint two hours to dry.
  4. Give the wood an additional two hours of drying time.

Can you stain OSB board?

OSB (oriented strand board) is similar to plywood and used primarily for subfloors, covering exterior wall studs and roofing. It is not usually stained or painted, but that doesn't mean that it can't be done. OSB used for interior and exterior projects will accept stain and clear coat sealing products.

Can you use subfloor as your floor?


Wood subflooring isn't designed to be the top layer of flooring. Well-constructed wood subflooring is sturdy, but using it as regular flooring could damage its surface and reduce its lifespan.

How do you prep a subfloor for painting?

The point of sanding is to smooth out major rough spots and smooth any wood filler you used. Before painting, you need to prime the floor with a quality primer. The quickest way to do this is to use a roller with an extension handle and then cut in around the edges with a brush.

Can I paint on plywood?

If you are painting a plywood surface in your home, go with an acrylic latex paint or an oil-based paint and primer. Next, fill any holes or imperfections in the surface with wood filler and let the filler dry completely. Once the filler is dry, sand the plywood thoroughly to create a smooth surface for the paint.