So if your subfloor is 3/4 of an inch thick, any screw about 1 3/4 inches long will do the trick. The house I’m building in central Arizona has a subfloor of 23/32″ Norbord Truflor OSB on i-joists over a ventilated crawlspace. Rain falls on many, many homes as they are being built. OSB takes longer to get saturated with water than plywood, but it also takes longer to dry out once it gets saturated. It has no odor and will do an excellent job of cleaning mold. Are you saying that some panels may absorb so much water from the edges that they will need to be replaced? The OSB floors should be swept clean each day after work concludes. Lesson learned. There’s no better way to protect your sub-floor, reduce time-consuming sanding and minimize callbacks. Otherwise, the problem will just happen all over again in a short time. Improper spacing. (Need an answer? Most subfloor-grade plywood uses similar glues between the laminators. Newer building products are available for subfloors that contain resins that protect the wood fibers from absorbing any water. Premium OSB decking like advantech is not harmed by water, it has a waxy treatment on it from the factory. It might rain for the next few days. Flat subfloors should be treated during construction in order to help prevent swelling and delamination. Q. Standing water on the OSB needs to be swept away. Step 2 - Plan and Cut Your Pieces You want the sides of the stacked lumber exposed to the air but protected so rainfall can't hit the lumber. Some OSB panels are created that have drainage slot in the tongues to help get rid of water. If possible, head to the job site and start drying the OSB subfloor as soon as the rain … All scraps of lumber, sawdust, etc., need to be off the OSB. Before any walls were built on a subfloor, I'd blow off all saw dust, pour out the clear water repellant and apply it with a large paint roller on a pole. Make sure that you use plywood or OSB that is stamped EXPOSURE 1. Use a cordless drill or you might shock your ass off. Under such a scenario, moisture from rain etc. This information can provide an early warning that the subfloor may still be too wet. Next time, invest in Advantech. The OSB floors should be swept clean each day after work concludes. Vinyl siding is cheap and DIY-friendly. Protecting subfloor from water during construction We're building a tiny house on a trailer, in Florida, during the rainy season. Acting quickly, therefore, means that your job of drying out the subfloor will be that much easier. It's great to know that the paint wouldn't cause any problems. However, nail-holding ability controls performance in shear wall applications. The glues used to make OSB are water-resistant because the … It is important to properly space OSB and Plywood panels to allow for natural expansion as they adjust to the moisture in the environment. All of Tim's past columns are archived for free at www.AsktheBuilder.com. Your OSB panels absorb water from the edges, and the paint won't slow that down. Fastener Holding Compared to PS-2 panels, AdvanTec… However, this option is only feasible if wall framing has not been erected. OSB subfloor is mostly serving as a base under the finish floor (hardwood, engineered wood, vinyl tile, etc.) The OSB floors should be swept clean each day after work concludes. House is up, trusses are up and sub-floor (OSB) is in. AdvanTech® Subfloor – the Flat Out Best™ AdvanTech flooring has been providing a stronger water resistant subfloor that can repel the elements during construction, and out perform plywood and OSB in installation and performance for any floor finish. Water on new wood at a construction site may seem like a problem, but there’s little to fret about as long as the site is kept clean and free of standing water. The Truflor has an Exposure 1 rating to withstand normal delays in construction without affecting its structural properties. Mock’s crew had to shovel snow off the deck then squeegee water off it over the course of the build. You'll probably end up with OSB that has swollen edges, creating ridges like picture frames. It shouldn't take long once you cut off the rain. I am in southern california and we're supposed to have a wet winter. Additionally, care must be taken to prevent water from collecting under the tarp. To avoid buckling, subfloor panels should be spaced with a 1/8-inch gap at all edges and ends to provide room for naturally occurring expansion. You want the sides of the stacked lumber exposed to the air but protected so rainfall can't hit the lumber. You spray the lumber and OSB using a the same garden sprayer. Standing water on the OSB needs to be swept away. The usual fix is to attack your subfloor with a belt sander after the roof is on, and to replace the worst of the OSB panels with new ones. Someone just told me that if I paint the top of the OSB, moisture will get trapped inside it, because if the dry, top side facing the sun is sealed, and the side facing the moist air of the crawlspace is unsealed, moisture will try to migrate from the moister, crawlspace side to the drier, top side, but get trapped underneath the paint. You want all the lumber to dry out as fast as possible after each rain. Plywood, or even OSB, has its strength running with its length. The wood rot you're familiar with happens in the presence of water and oxygen. Timbered logs are routinely salvaged that never made it to sawmills over a hundred years and these logs are prized pieces of wood. Plywood is available in many thicknesses (1/8”, 1/4”, 11/32”, 15/32”, 19/32”, 23/32” and 1 1/8”). This is one good reason why good construction includes good organization and scheduling. Lower cost than plywood. Sweep Standing H²O. What commonly happens is that the edges swell and telegraph the seams through any finished flooring or underlayment you will be installing. You want all the lumber to dry out as fast as possible after each rain. Hi, My contractor is going to start framing the roof next week...he figures that it will take 2 weeks to complete. Several coats of paint will help preserve the surfaces of OSB but be sure to coat any exposed edges and joints extra well. If the plywood subfloor you’re placing is 5/8 of an inch thick, you need a screw about 1 5/8 inches long. Every wood subfloor over a crawl space should be tested for moisture. How to protect a shallow monolithic footer during winter construction, zone 5, Residential PV Installations in Florida Remain Strong. Wood in Arizona (especially moist wood) is going to be a termite nightmare. I tried tarps to keep the subfloor dry, but they failed miserably. This means the job site needs to be clean. Your framing lumber and the oriented strand board (OSB) are going to be fine. Edge Gold includes patented Down Pore ® grooves that help shed standing water and a proprietary edge seal to reduce edge swell. Jeff, Tolko T-STRAND™ OSB panels are improved, warrantied, and ready to perform. You can also use chlorine bleach, but many complain about its fumes and toxicity to nearby plants and vegetation. Wood rot can and will start when the moisture content of the wood reaches 20 percent. FAQ: Why Do Some Builders Avoid Foam Insulation. OSB vs. Plywood. Will it hurt the lumber? It's unlikely you will need to replace any of the OSB subfloor for structural reasons. In fact, the coating on this tried and tested sub-floor helps reduce water absorption by up to 40%. Don't interior finish until the moisture in the wood has stabilized! Step 3 Apply an outdoor, latex-based paint to plywood in order to provide more protection that will have a more aesthetic appearance than traditional stains. Wear eye protection and a dust mask when sanding OSB to avoid injury from any splinters or sanding dust. Thank you, Martin. Some OSB panels are created that have a drainage slot in the tongues to help get rid of water. You want all the lumber to dry out as fast as possible after each rain… If you are worried about your floor, lay some 1/2" plywood over the subfloor (after dried-in) and then finish floor over that. If you do have mold growing on the lumber, you can clean it easily with an oxygen bleach solution. Additionally, care must be taken to prevent water from collecting under the tarp. Jeff, You'd probably be surprised to know that lumber that is submerged in fresh water can be in great shape and rot-free for hundreds of years. MERC. Vinyl siding is cheap and DIY-friendly. 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