The thickness of plywood panels in a subfloor is regulated by the spacing of the joists. This number is known as a span rating. When installing a plywood subfloor on top of the slab at grade, the thickness is governed by how long the fasteners for the flooring will be. Floor joists are made from 2-byinch or 2-byinch lumber, or from engineered quiet beams, which are made from a thin layer of chipboard on edge between two lumber caps forming an "I" shape.
Floor joist spacing has traditionally been 24 inches on center, or from center to center of the joists. Newer construction has floor joists spaced at 16 inches on center.
You will need to determine the spacing before installing the joists, or measure the distance between joists for existing construction. CDX is cosmetically rough and may contain imperfections. Cheap and strong makes CDX plywood great for use as a structural panel such as a subfloor. Remember the letter grade of plywood only has to do with cosmetics and not strength.
CDX plywood is just as strong as higher grades. You can buy it with either a flat or tongue-and-groove edge. One side is rough and one side is smooth. We generally face the smooth side up. Both types are blued to the floor joists and then screwed or nailed down. Plywood is made by gluing together multiple sheets of wood veneer. The grain of each sheet is run against the previous sheet.
This alternating grain makes traditional plywood very strong and stiff. OSB oriented strand board is made by gluing together large, flat wood chips stacked in multiple layers. The chips are glued together and then pressed into sheets. Most of the chips are made from wood bits leftover from other wood products.
Because of this, OSB is usually much cheaper than plywood. Especially when the floor can possibly get wet or has tile, hardwood or laminate flooring. Plywood is stiffer, stronger, and less prone to water damage. Plywood is used as a subfloor material which means it helps support the finished flooring.
In some cases it even helps secure it by holding the nails such as with hardwood. So it needs to be string and stiff. If your plywood flooring flexes even a little you could end up with squeaks, gaps or cracks. In all cases, I think CDX is the best type of plywood flooring. If you have any questions or comments e-mail us any time.
What Is Plywood Plywood is made up of three or more thin layers of wood that are glued together. Underlayment and finished flooring are both installed on top of the plywood subfloor. Panels graded A are free of small knots and defects.
B graded panels may have small defects. C graded panels may have open knots, holes and discolorations D graded panels may have several defects. X graded panels are on par with scrap wood and have serious defects. They make a good subfloor for carpeting, tiles, vinyl, engineered wood laminate flooring and hardwood flooring. Almost every room of the house uses interior grade plywood including kitchens and baths.
Because the underlayment helps protect plywood from moisture you can use it in wet areas. Exterior plywood is a better choice for rooms that see a lot of moisture. In some cases we use these in kitchens and baths instead of interior grades.
Structural plywood can be used for rooms that have to bear an extremely heavy load. We rarely use this on residential homes. Marine plywood is the strongest and most water resistant type of plywood. We almost never use this inside the home. Plywood Thickness All types and grades of plywood come in a variety of thicknesses. The thickness of your plywood flooring depends on a few different factors. Joist span is very important when calculating the thickness of a plywood floor.
Finish flooring material is another important thing to consider. If your installing tile I recommend going thicker. This evolved plywood may claim an overall advantage over OSB, since plywood is a stiffer, longer-lasting subfloor option. It will also hold up better under flooring accidents like leaks or flooding, and has greater nail withdrawal strength to hold the nail in under stress. Disclosure: BobVila.
You agree that BobVila. All rights reserved. Expert advice from Bob Vila, the most trusted name in home improvement, home remodeling, home repair, and DIY. Plywood vs. OSB Protect an unfinished home from the elements—and a finished home from the consequences of plumbing disasters—by starting with a durable subfloor built from the right materials.
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