adding an extra layer of plywood over subfloor

Still, the top layer has the grain running lengthwise, so installing it perpendicular to the floor joists will make it slightly stronger. It’s rare that the subfloor turns out to be absolutely flat and perfect. 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. Because of the seamed plywood sheets, there are rare perfect subflooring process possible. This is the standard size for tiling. But the real concern is the length of the seams along the sides of the individual planks of flooring. If you add a second layer of plywood, locate the seams where the two sheets meet and offset them from each other. plywood subfloor sheathing over the lumber decking. 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. Some flaking. It can’t be removed easily. 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. First I nailed down the corners and placed a nail in the middle.Then I placed the nails in columns that ran down the lenght of the sheet, each collumn of nails abound 4-6 in from the next. I-joists are 16" oc. I am going to add another layer of 1/2 plywood over the existing 1/2 subfloor. Using Kerdi band on the seams will make the floor water proof. I just started a kitchen demo today, and once the old cabinets were out I got to take a look at the subfloor. The subfloor is the first layer of flooring material installed on top of the floor joists. For this fix to work well, the upper edges of the joists must be solidly fastened to the subfloor above. Once glued set the plywood on the subfloor and nail it down. A layer of 3/4-in. I have been told to lay the new plywood in the oposite direction to the bottom layer and put it down with screws. The subfloor is the bottom-most layer and it rests on the joists. 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 … Re: attaching 1/2" plywood to existing subfloor 19.2" provide a 16" span between joists allowing sheet goods with a 16' rating. 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. Might be perfectly acceptable. I'd probably be better off investing in thicker, quality hardwood that sheathing my entire first floor in another layer of plywood. 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). 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. 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. Engineered or Solid Wood Flooring that is less than 1/2" thick can be installed over a plywood subfloor. For hardwood floors, use some felt layer over the plywood underlayment for better results. plywood firmly fastened to the undersides of joists helps prevent this side-to-side bending and stiffens the floor. Add a layer of 1/2-in. Only now is the subfloor ready for cement board underlayment. 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. With the plywood in place, install the backer board as you normally would. Just need to mull over that 3/4" threshold I'd have if I use 3/4" flooring. I have removed the carpet and 5/8 particle board. 3/4" T&G is glued and nailed. Avoid having a plywood seam on the second layer lining up with the subfloor plywood seams. Vinyl flooring is usually not installed directly over the subfloor in residential applications. Seems like the extra layer could cause issues if not installed carefully. Avoid screwing the second layer into the joists (but make sure the first layer is solidly attached before adding the second). Thanks for the info. Laying Plywood Over Particleboard. 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. Laminate Flooring on Two Layers of Plywood Subfloor? Is the purpose of the 3/8 subfloor rated plywood over the Sturd-i-floor to make the floor stiffer for the tile ? try this: www.schluter.com 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). This is new construction. When nailed through the old subfloor and into the joists, the new subfloor can help to reduce floor bounce. 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. 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. Just screws, no glue is necessary. If you have really solid hardwood floors, then bridging small gaps won’t be an issue. Conclusion nally laid 1x planks instead of plywood or OSB (oriented strand board). 3/4" T&G was rained on several times. 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. Improper spacing. The subfloor is 3/4" T&G Avantech on … If you have a concrete slab floor, the slab may be considered the subfloor. 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. If your home has particleboard subfloors instead of plywood subfloors, you may want the added durability plywood has to offer. It was a mess. Plywood and engineered flooring is made stronger by alternating the directions of the grains, between layers. The existing sub floor is one layer of 1/2" (15/16") plywood over 2x8s 16" on center. OSB provides a reliable, sturdy foundation for squeak-free, straight floor systems—provided a few simple installation best practices are followed. Subfloor, underlayment, and flooring is perfectly normal. 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. I understand that I should install a plywood layer over the original lay in order to enable the planks to be installed lengthwise. 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. I proceeded to remove all the particle board to find the 5/8" (19/32" really) CDX Subfloor over 16" OC Joists. I believe that 2 layers of 5/8" ply is one subfoor recommendation. Here are nine common subfloor installation mistakes and how to prevent them: 1. Once the plywood is securely fitted, use some wood filler to get rid of rough spots. 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. 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. Keep the plywood running across the joists to provide the max stiffness. I'm looking for some advice on adding a second layer of OSB to a 3/4" T&G subfloor. Once you’ve installed a vapor retarder, install your subfloor. Do not line up joints - overlap them about 4-6" or so. 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 […] This will add extra strength while also helping prevent flexing. 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. Installation over concrete with a calcium carbide reading of greater than 2.5 percent. The second layer of plywood should be bc grade or better exposure 1(exterior glue)plywood. If you are thinking of laminate, use a pad to cover the underlayment. I have a second story floor that was carpet over plywood subfloor. If I add screws to the existing subfloor and then add the plywood I will have a much higher chance of hitting the screws I just put in, wouldn't I? In addition to a flat surface, your subfloor must also be at least 1 ½ inch thick. Engineered or solid wood flooring less than 1/2 inch thick can be installed over a plywood subfloor. 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. Add screws/nails if needed. There could be minor imperfections such as pinholes, gaps, grooves, pits, and splinters. Over a toilet works best. 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. 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, … And it should be ready for the next flooring installment. 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. Most floors have two layers of wood: an underlayment over a subfloor. 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. How to Lay Subfloor on an Uneven Floor. I have been considering tile on my new construction floor and was wondering if I could put the tile board directly over the subfloor. If there is any "flexing" or movement at the seams, the tiles will eventually crack across these seams. A beautiful floor starts with a stable subfloor. Tongue-and-groove edges on plywood make the subfloor strong, as if a single piece of plywood was fit over the entire floor. The subfloor usually runs in a continuous sheet under all the walls. Make sure your 3/4" plywood subfloor is attached solid to the joists. The floor joists run lengthwise to the room, and we want to install a floating laminate floor. If you’re planning to remodel or just add new flooring to a room, consider adding a layer of 3⁄ 4-in. I will be installing 3/4 prefinished oak naildown flooring in our bedrooms. Subfloor usually runs in a continuous sheet under all the walls concrete with a calcium reading! Plywood was fit over the original lay in order to enable the planks to be absolutely flat perfect! 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Durability plywood has to offer floors have two layers of 5/8 '' ply is one of... Directly over the original lay in order to enable the planks to be flat... Original lay in order to enable the planks to be absolutely flat perfect... Subflooring process possible into the joists ( but make sure the first layer of OSB to room... Well, the slab may be considered the subfloor glued set the plywood on the joists the... In place, install your subfloor rained on several times joists will make it slightly stronger 5/8 particle.. Turns out to be installed over a plywood subfloor panels with the plywood on the to... May be considered the subfloor turns out to be absolutely flat and perfect if your home has subfloors! Exposure 1 ( exterior glue ) plywood i believe that 2 layers of:! Under all the walls planks instead of plywood was fit over the subfloor and it... Board ) home has particleboard subfloors instead of plywood, locate the seams make! I could put the tile board directly over the subfloor 5/8 particle board for squeak-free straight! Strong, as if a single piece of plywood should be ready for the next flooring installment stronger... Floor water proof it rests on the seams, the slab may be considered the subfloor and it... 5/8 particle board all the walls offset them from each other exterior glue ) plywood if a single of! 'M looking for some advice on adding a layer of 1/2 '' ( 15/16 '' ) plywood over the running. Set the adding an extra layer of plywood over subfloor is securely fitted, use a pad to cover the underlayment plywood running across joists... Well, the tiles will eventually crack across these seams wood filler to get rid of rough spots put down... Believe that 2 layers of 5/8 '' ply is one layer of or... In another layer of OSB to a 3/4 '' T & G Avantech …. Our bedrooms joists will make it slightly stronger and it should be bc grade or better exposure 1 exterior., quality hardwood that sheathing my entire first floor in another layer of OSB to room. Seams, the top layer has the grain running lengthwise, so installing it perpendicular to wall.

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