I need your help. We are renovating a 1970 built home and have taken out the existing carpet and linoleum, along with the 5/8' particle board subfloor, leaving only a 1/2' plywood layer, not t&g, over joists 16' oc. We are planning to install a 1/2'-3/4' solid hardwood floor, and are trying to determine to correct way to do this with our existing 1/2' subfloor. Our plan, since the existing sublfoor is less than 5/8' or 3/4' is to install another layer of plywood subfloor, so we are looking at adding an additional 5/8' CDX plywood, but we are getting conflicting ideas on the correct way to do this. Glue and screw? Jan 25, 2016 Sleeper Joist Over Existing Subfloor Project involves expanding a kitchen into a enclosed porch area. The porch is 2x8 joist (spanned 11') with 3/4' T&G strip (likely syp or fir). Feb 17, 2015 - Here are nine common subfloor installation mistakes and how to prevent. On the panels' interior supports, or as specified on the construction. Existing floor is ceramic tile over cement over the 1x subfloor. Joists are 16' centers. Second layer of subfloor needs to be 3/4' to match floor height in adjacent family room which is a 3/4' plywood with some sort of finish on it. If you must install over such surfaces, it is best to install a backer board over the old surface and install the tile on the backer board. If installing over an appropriate wood surface, sand the wood to make it smoother, and remember that the installation will work better over a subfloor at least 1-1/8 inches thick. Screw into the joists or just into the field? If we glue, what kind of glue is recommended, a subfloor adhesive like liquid nails, or something else, and glue just at the seams or all over? As far as the screwing, into the joists or just into the field and subfloor beneath? How far apart on edges and in field? We plan to run the second layer of plywood parallel to the first (perpendicular to joists) and to use 1 1/4' deck screws and to lay the second layer as to miss the seams on first layer, but I'm not sure by how much on long and short edges (4x8) or if it matters. Any input would be helpful. If you only checked one or two places, check more. Most subfloors are T&G (long sides only) and at least 5/8' thick. If yours isn't, then now would be a good time to make it so. The T&G is a structural component of the subfloor and proper installation of a subfloor is to glue and screw or nail to the joists. The end joints must fall on a joist. The second layer of plywood on a subfloor is an underlayment, not another subfloor. If you do replace your subfloor with 3/4' T&G CDX, you won't need an underlayment and you can maintain a nominal elevation of flooring throughout. Installing windows xp on hp xw4600 memory. That will be important if your hardwood transitions to another type of flooring in the doorways of other rooms or areas. Jim is right. If you really don't have tongue and groove ply as a subfloor, put the extra work in. Get it out of there and put 3/4 t&g back in. Two layers will work to be certain, but even at 3/4 on top of the standard 1/2 inch cdx you still won't have the strength you would with t&g. I do commend you for wanting plywood and not asking about osb.incase this advice isn't something you can do. I would suggest a new 3/4 layer, parallel as you mentioned and offset by 1/2 to the original. I'm personally not a fan of glue on this layer but I am in the minority. Screw through into the joists and then throw some fasteners into the field as well. If you only checked one or two places, check more. Most subfloors are T&G (long sides only) and at least 5/8' thick.
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