DIY Builds
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Should you waterproof OSB subfloor?

It is not necessary to waterproof the OSB board again after buying a waterproof OSB board. OSB is more water-resistant than plywood. So, OSB can be used for both indoor and outdoor projects. Make sure that you know how to make OSB board waterproof to add barrier against moisture or water.

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Oriented Strand Board or OSB is a great replacement for plywood. OSB is thicker and thus stronger than plywood. You can use it for flooring, roof decking, sheathing in walls or even making furniture. OSB is made by mixing resin with strands of young wood. This makes the board hard. The manufacturers waterproof the board before selling. However, you may still need to waterproof it before making your furniture or other things to provide additional moisture protection and ensure its durability. This is especially important for outdoor applications of OSB. Here we will discuss how to make OSB waterproof.

Main steps how to make OSB waterproof

You can make OSB waterproof quite easily. When you buy the OSB make sure that you have the ‘waterproof’ mark at the back. This will make your task of additional waterproofing easier. Here are the steps you should follow: Plan before you cut your pieces. When you cut the sealer at the edges disappears and opens up a new place. So, moisture may get absorbed there. So, cut the OSB into pieces before waterproofing so that no water gets trapped inside. Keep the cut pieces in a safe place so that dirt or grass cannot get in the way. You can paint OSB if you want to add to the water-resistant. If you decide to paint it then it must be done before waterproofing so that the paint is also protected from moisture or water. You can use either oil-based or latex-based paints. Then you should apply waterproofing. You can purchase good-quality waterproofing solutions from the local hardware store. Make sure that the waterproofing solution you buy is appropriate for use in wood. You just need to use a paintbrush to apply the waterproofing coat on the OSB pieces. Repeat applying it on each side. It will take about 12 to 14 hours for the waterproofing to dry. To ensure that the OSB is waterproof pour some water on the OSB piece and wait for a few hours. If the water is not soaked then the OSB pieces are now waterproof.

Differences in the use of OSB inside and outside

OSB can be used for outside applications. However, those OSB boards are classified as class 3 and they are appropriate for use in humid conditions. Even if you buy OSB that is waterproof from the market, you should apply an additional layer of waterproofing for protecting the board from moisture or water. OSB that is used for indoor use has phenol-formaldehyde or methyl diphenyl diisocyanate binders to avoid health hazards. It is not necessary to waterproof the OSB board again after buying a waterproof OSB board. OSB is more water-resistant than plywood. So, OSB can be used for both indoor and outdoor projects. Make sure that you know how to make OSB board waterproof to add barrier against moisture or water.

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What does crowning studs mean?

What Does “Crowning a Stud” mean and why is it important? “Crowning” is when you take a piece of lumber and you sight it. “Sighting” lumber is when you pick up the piece of lumber and put your eye on the board and then look from one end to the other to see if it has a curve.

“Crowning” is when you take a piece of lumber and you sight it. “Sighting” lumber is when you pick up the piece of lumber and put your eye on the board and then look from one end to the other to see if it has a curve. A piece of lumber can be bowed, crooked, kinked, cupped, and twisted. At Buck Robertson Contracting we always crown all material installed into the structures we build. Crowning your studs is important because it makes for flatter finished walls. We always crown the studs out, which gives us results like this: The “plumb line” represents what a flat wall looks like. The drywall board goes onto the wall and follows the curve of the wall (concave). A crowned out wall (which is concaved, as shown above) allows the drywallers to place their mud in the center of the wall in order to fill in the space between the plumb line and the drywall board. This consolidates the majority of the mudding to one location. When mudding a wall, you want a flat surface and to cover the joint made by the drywall board.

Wavy Walls

If the walls are not crowned, the drywall board on the wall will be wavy (as shown below). This will make it more likely for screw pops. This will also add to excessive work for your drywallers.

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