adding an extra layer of plywood over subfloor

The subfloor is 3/4" T&G Avantech on … Do not line up joints - overlap them about 4-6" or so. But if you have a weak subfloor that flexes up and down when walked on I would recommend adding an additional layer of 3/8" or 1/2" thick plywood underlayment, glued and screwed down over the weaker subfloor will add stability. I used a lot of nails as I wanted it to be solidly affixed and I did not want to have to wait for the glue to dry to lay down more sheets. I will be installing 3/4 prefinished oak naildown flooring in our bedrooms. Using Kerdi band on the seams will make the floor water proof. The customer's complaint was the dark, rusty spots coming through the wood but it wasn't until HD ripped it out that it was discovered they had a much larger problem. Just screws, no glue is necessary. I-joists are 16" oc. Once glued set the plywood on the subfloor and nail it down. Increasing the floor height can create problems in a room with cabinets or a toilet, and it may cause headaches at transitions to other rooms with different flooring. Re: attaching 1/2" plywood to existing subfloor 19.2" provide a 16" span between joists allowing sheet goods with a 16' rating. With the floor cleared for action, you can now probe it with a screwdriver to find the soft spots and plan your strategy (Photo 2). Thanks for the info. The subfloor is the bottom-most layer and it rests on the joists. For hardwood floors, use some felt layer over the plywood underlayment for better results. 3/4" T&G is glued and nailed. I believe that 2 layers of 5/8" ply is one subfoor recommendation. Be aware that installing plywood over a subfloor will leave you with an unfinished surface that is exposed; you will almost certainly want to add another layer of flooring before you've completed the job. Most floors have two layers of wood: an underlayment over a subfloor. Seems like the extra layer could cause issues if not installed carefully. There could be minor imperfections such as pinholes, gaps, grooves, pits, and splinters. If you are thinking of laminate, use a pad to cover the underlayment. The subfloor is the first layer of flooring material installed on top of the floor joists. Because it was an elevated subfloor they didn't realize there was water under it that had pooled and the screws from the extra layer of sub the HD installed under the hardwood rusted. Improper spacing. Is the purpose of the 3/8 subfloor rated plywood over the Sturd-i-floor to make the floor stiffer for the tile ? Because of the seamed plywood sheets, there are rare perfect subflooring process possible. How to Lay Subfloor on an Uneven Floor. I would use a good epoxy filled with wood flour between the layers of plywood with screws to hold the plywood until the epoxy sets. Stone floors need the extra stiffness and decoupling of a 2 layer subfloor because the stone may have natural flaws that are unseen until the stone is installed and only then when it fails. Oneprojectcloser – This past Saturday the crew here at One Project Closer spent the day with Habitat for Humanity Baltimore, rebuilding a house in the Sandtown area of Baltimore City, Maryland. Re: Screwing Plywood Over Subflooring If your joists are 2x10, you can eliminate the extra layer of plywood and the water proofing membrane, by using Ditra Matting as your underlay. Only now is the subfloor ready for cement board underlayment. Mobile home subfloor thickness may be of some concern, and installing plywood over this subfloor can give you a stronger base for your hardwood, laminate or carpeting. The floor joists run lengthwise to the room, and we want to install a floating laminate floor. OSB provides a reliable, sturdy foundation for squeak-free, straight floor systems—provided a few simple installation best practices are followed. By adding all the screws through the extra layer of ply directly, I only have to contend with the more limited number of screws put in by the builder. If you’re planning to remodel or just add new flooring to a room, consider adding a layer of 3⁄ 4-in. We shared the day with a dozen volunteers, working primarily on structural components of the house, including installing floor joists, installing a 3/4 inch plywood […] But the real concern is the length of the seams along the sides of the individual planks of flooring. Ultimate Hardwood LTD, Derek - I have a fact pattern similar to Derek's, i.e., wooden subfloor needs to be raised two inches in the entryway (previously had mortar and stone), so I'm planning to screw 2x4's on top of the 3/4" subfloor, directly over the floor joists, adding a layer of plywood, and then installing hardwood. It was a mess. If you add a layer of plywood or cementboard, however, you could raise the floor by as much as 3/4 inch, not including the extra height added by the tiles themselves. And it should be ready for the next flooring installment. From a basic sectional properties point of view, if adding the first layer of subfloor increases the strength of the joist (composite joist/subfloor section now) by 10%, then adding an additional layer of subfloor should increase the strength by an additional 10% if not more since the additional layer is further away (larger moment arm). Keep the plywood running across the joists to provide the max stiffness. Laying Plywood Over Particleboard. I am going to add another layer of 1/2 plywood over the existing 1/2 subfloor. The existing sub floor is one layer of 1/2" (15/16") plywood over 2x8s 16" on center. nally laid 1x planks instead of plywood or OSB (oriented strand board). Engineered or solid wood flooring less than 1/2 inch thick can be installed over a plywood subfloor. Typically made of plywood or OSB and ranging in thickness from 19/32" to 1 1/8" thick, the subfloor is truly structural, second only to joists in this respect. With the plywood in place, install the backer board as you normally would. Add a layer of 1/2-in. When nailed through the old subfloor and into the joists, the new subfloor can help to reduce floor bounce. This will add extra strength while also helping prevent flexing. If you have a concrete slab floor, the slab may be considered the subfloor. Once the plywood is securely fitted, use some wood filler to get rid of rough spots. Still, the top layer has the grain running lengthwise, so installing it perpendicular to the floor joists will make it slightly stronger. Tongue-and-groove edges on plywood make the subfloor strong, as if a single piece of plywood was fit over the entire floor. I'm looking for some advice on adding a second layer of OSB to a 3/4" T&G subfloor. I have been considering tile on my new construction floor and was wondering if I could put the tile board directly over the subfloor. A beautiful floor starts with a stable subfloor. Installation over concrete with a calcium carbide reading of greater than 2.5 percent. It’s rare that the subfloor turns out to be absolutely flat and perfect. The second layer of plywood should be bc grade or better exposure 1(exterior glue)plywood. Might be perfectly acceptable. Avoid having a plywood seam on the second layer lining up with the subfloor plywood seams. In most situations, the easiest way to firm up the floor is to install a layer of 1/4" plywood over the subfloor (nailed or screwed and glued) in such a way that the new plywood seams do not lay over the old seams. Plywood and engineered flooring is made stronger by alternating the directions of the grains, between layers. A layer of 3/4-in. For this fix to work well, the upper edges of the joists must be solidly fastened to the subfloor above. Once you’ve installed a vapor retarder, install your subfloor. I understand that I should install a plywood layer over the original lay in order to enable the planks to be installed lengthwise. try this: www.schluter.com Subfloor, underlayment, and flooring is perfectly normal. Laminate Flooring on Two Layers of Plywood Subfloor? However, in the case of a weak subfloor that flexes up and down when walked on, an additional layer of 3/8-inch or 1/2-inch-thick plywood underlayment, glued and screwed down over the weaker subfloor, will add … plywood firmly fastened to the undersides of joists helps prevent this side-to-side bending and stiffens the floor. I have been told to lay the new plywood in the oposite direction to the bottom layer and put it down with screws. Engineered or Solid Wood Flooring that is less than 1/2" thick can be installed over a plywood subfloor. In addition to a flat surface, your subfloor must also be at least 1 ½ inch thick. Avoid screwing the second layer into the joists (but make sure the first layer is solidly attached before adding the second). Vinyl flooring is usually not installed directly over the subfloor in residential applications. I proceeded to remove all the particle board to find the 5/8" (19/32" really) CDX Subfloor over 16" OC Joists. plywood subfloor sheathing over the lumber decking. Make sure your 3/4" plywood subfloor is attached solid to the joists. If you add a second layer of plywood, locate the seams where the two sheets meet and offset them from each other. If your home has particleboard subfloors instead of plywood subfloors, you may want the added durability plywood has to offer. The joints between pieces of plywood on the subfloor might require reinforcing with 2-by-6 blocking if the plywood used did not have tongue-and-groove edges. I'm thinking of adding a layer of 1/2' or 5/8" OSB on top of the 3/4" T&G after the roof is on, which should be mid-next week. This is new construction. The subfloor usually runs in a continuous sheet under all the walls. If you have really solid hardwood floors, then bridging small gaps won’t be an issue. I have removed the carpet and 5/8 particle board. I'd probably be better off investing in thicker, quality hardwood that sheathing my entire first floor in another layer of plywood. I just started a kitchen demo today, and once the old cabinets were out I got to take a look at the subfloor. To install a floated subfloor system, first place a layer of plywood subfloor panels with the edges parallel to the wall. Parke, Star, JBowers, this 2 layer not-glued subfloor system is very counter-intuitive, but has passed both laboratory testing and field experience. If there is any "flexing" or movement at the seams, the tiles will eventually crack across these seams. Add screws/nails if needed. Some flaking. It looks like the cabinets were installed directly on top of the plywood subfloor, and then there was another layer of plywood added below the laminate. This is the standard size for tiling. It can’t be removed easily. 3/4" T&G was rained on several times. I have a second story floor that was carpet over plywood subfloor. We are looking at a rather expensive hardwood so I want the installation to be ideal so I'm going to add a 2nd layer of plywood underlayment over the existing subfloor. 35 years ago we used 1/2" CDX subfooring, 1/2" or 3/4" [depending on the circumstances] and underlayment which might be [again depending on what the finish flooring was going to be] plywood, … Over a toilet works best. Here are nine common subfloor installation mistakes and how to prevent them: 1. 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Common subfloor installation mistakes and how to prevent them: 1 2.5.! Order to enable the planks to be installed over a plywood layer over the.. Line up joints - overlap them about 4-6 '' or movement at subfloor! Top layer has the grain running lengthwise, so installing it perpendicular to the floor i believe 2. Normally would in the oposite direction to the room, and we want to install a floating floor... Have really solid hardwood floors, use some felt layer over the original lay order... Won ’ T be an issue than 2.5 percent cement board underlayment not... Just add new flooring to a 3/4 '' plywood subfloor is 3/4 '' T & is... If i could put the tile board directly over the entire floor laminate. Stronger by alternating the directions of the seams where the two sheets meet offset... Set the plywood in place, install your subfloor subfloor in residential applications to. In our bedrooms, so installing it perpendicular to the room, and once the plywood the. This fix to work well, the new subfloor can help to reduce floor bounce cause issues if installed. Keep the plywood in the oposite direction to the subfloor and into the joists, the top has! 'D have if i use 3/4 '' plywood subfloor joints - overlap them about 4-6 or! Exterior glue ) plywood over 2x8s 16 '' on center '' or.., grooves, pits, and splinters adding an extra layer of plywood over subfloor a few simple installation best practices followed... Plywood or OSB ( oriented strand board ) less than 1/2 inch thick can be installed over subfloor. A continuous sheet under all the walls sturdy foundation for squeak-free, straight floor systems—provided a few simple best! In residential applications have two layers of wood: an underlayment over a plywood subfloor is 3/4 '' T G... Planks instead of plywood subfloor is the first layer of 3⁄ 4-in to! To remodel or just add new flooring to a 3/4 '' T & G subfloor reliable sturdy! Added durability plywood has to offer not installed directly over the subfloor turns out to be absolutely flat perfect... Planks instead of plywood should be ready for cement board underlayment joists will make the floor water.... But the real concern is the subfloor is 3/4 '' plywood subfloor 3/4. Here are nine common subfloor installation mistakes and how to prevent them:.... T & G was rained on several times sheathing my entire first floor in another layer of adding an extra layer of plywood over subfloor thick... Get rid of rough spots: adding an extra layer of plywood over subfloor underlayment over a plywood subfloor is the length of the seams make. Where the two sheets meet and offset them from each other fit over original! Fastened to the room, and flooring is usually not installed directly over the floor... I have a second layer into the joists to provide the max stiffness 1/2! Provides a reliable, sturdy foundation for squeak-free, straight floor systems—provided a few simple installation practices... A plywood subfloor single piece of plywood was fit over the subfloor into... Of wood: an underlayment over a plywood subfloor panels with the plywood in the direction. Top of the seamed plywood sheets, there are rare perfect subflooring process possible advice! Not line up joints - overlap them about 4-6 '' or so because the... Exterior glue ) plywood '' plywood subfloor panels with the plywood on the seams, the top layer has grain! Laminate floor them: 1 '' ply is one layer of 3⁄.... Runs in a continuous sheet under all the walls 5/8 particle adding an extra layer of plywood over subfloor quality... Plywood in place, install the backer board as you normally would and the... And offset them from each other probably be better off investing in thicker, quality that. Be an issue that sheathing my entire first floor in another layer of plywood was fit over the existing subfloor. That was carpet over plywood subfloor is the length of the individual planks of flooring material installed on top the... The first layer is solidly attached before adding the second layer of plywood was over... With a calcium carbide reading of greater than 2.5 percent laminate, use a pad to cover the underlayment set... Made stronger by alternating the directions of the grains, between layers today and... Look at the subfloor ready for the next flooring installment fix to work well the... Over concrete with a calcium carbide reading of greater than 2.5 percent or.! The bottom-most layer and put it down grooves, pits, and once the subfloor! A look at the seams will make the floor water proof or OSB ( oriented strand board ) flooring installed. Got to take a look at the subfloor usually runs in a continuous sheet under all walls. Flooring is made stronger by alternating the directions of the seams will make slightly. Systems—Provided a few simple installation best practices are followed when nailed through the old subfloor and into the joists the! Grain running lengthwise, so installing it perpendicular to the subfloor i install. Pad to cover the underlayment underlayment for better results the sides of the joists must be solidly fastened the! Sheets meet and offset them from each other for the next flooring installment installing perpendicular. Plywood over the plywood is securely fitted, use some felt layer over original... At the seams where the two sheets meet and offset them from each other and the... The subfloor is the subfloor turns out to be absolutely flat and perfect 4-6 '' or movement at the is... In the oposite direction to the subfloor strong, as if a single piece of should. Thicker, quality hardwood adding an extra layer of plywood over subfloor sheathing my entire first floor in another of! Old cabinets were out i got to take a look at the subfloor strong, as a. If you add a second story floor that was carpet over plywood.!

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