Many manufacturers recommend applying a continuous ¼-inch-diameter glue bead to framing members and using a serpentine pattern for supports that are 3½ inches or wider. Apply two beads of glue to panel joint locations; a 1/8-inch glue bead applied at the tongue-and-groove joints can further improve floor performance.
Should you glue tongue and groove subfloor?
Many manufacturers recommend applying a continuous ¼-inch-diameter glue bead to framing members and using a serpentine pattern for supports that are 3½ inches or wider. Apply two beads of glue to panel joint locations; a 1/8-inch glue bead applied at the tongue-and-groove joints can further improve floor performance.
Should tongue and groove be glued?
The recommended glue for floating installation is Tongue and Groove engineered flooring glue. Glue placement is very important. The glue must be placed along the topside of the groove the full length of the grooved side and end.
Does plywood subfloor need to be tongue and groove?
For subflooring, you use tongue and groove plywood. The tongue and groove are only along the 8 foot edges. On the four foot edges, your seams will fall on joist tops, so no need for tongue and groove. … Remember, you only do this for the first row of plywood.Which side of subfloor goes up?
When installing sub-flooring, you’ll want the rough side facing up as well for traction when working. This is especially true when you have OSB that has been treated with a sealant or moisture barrier.
Which way do you lay plywood on floor joists?
Tip: plywood sheets are always installed with the grain across the joists. Spanning ratings for plywood and OSB are based on this assumption. Stagger adjacent sheets so that they do not start on the same joist.
How tight should tongue and groove be?
All it takes is 1⁄8″. The joint should be a firm press fit: If you have to knock the pieces together, then struggle to pull them apart, the joint’s too tight. A tongue that’s a hair too fat for the groove may actually seat, but it will stress the groove sidewalls and may, in time, prompt them to split.
Does plywood need expansion gap?
If you install plywood sheets tightly against one another, the edges tend to pucker upwards when they expand. … Virtually every one recommends that you, your carpenter or builder create a 1/8 inch gap around all edges when installing plywood. This gap will minimize or totally eliminate any puckering caused by swelling.Should you screw or nail subfloor?
Using code-approved screws rather than nails is the best option for avoiding movement. If using nails for subfloor installation, stick with ring-shank nails; smooth nails may withdraw easier, leading to squeaks.
How far apart should screws be in plywood?As a general rule, every 6 inches is a minimum you should do, with ever 4 inches around perimeters or problem spots. Lay a bead of PL400 or equivalent construction adhesive between your joist and plywood.
Article first time published onIs it better to use OSB or plywood for subfloor?
The National Tile Contractors Association and the Resilient Floor Covering Institute both recommend plywood for subflooring and underlayment, because it doesn’t have the risk of swollen edges that OSB does. Plywood also has a slight advantage in stiffness, which means that subflooring panels need not be quite as thick.
What type of plywood is best for subfloor?
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. CDX is a type of plywood that grades C, D or X.
How thick should plywood subfloor be?
The minimum thickness of plywood for subflooring is about 5/8 inch. Since it does not hold fasteners as well as plywood, OSB must be a little thicker, or at least 23/32 inch.
What is the best glue for tongue and groove?
Titebond Tongue & Groove Flooring Glue is specifically formulated for all types of engineered floating wood and laminate floating floors, even over radiant heat systems. It provides a superior bond at the tongue and groove. Due to its white color, the glue is easy to see for quick cleanup.
What kind of nails do you use for tongue and groove?
The two most common types of nails used for tongue and groove paneling projects are the brad nail or the finish nail. Brad nails are made of 18-gauge steel wire and because they are very thin nails, it makes them perfect for use with delicate material such as pine wood.
What is the difference in shiplap and tongue and groove?
Shiplap panels overlap, while tongue and groove panels interlock. … Wood often shrinks in dry climates, and shrinkage is less likely to show with shiplap because it overlaps instead of interlocks. Tongue and groove panels may be a better option for very cold climates because they insulate slightly better than shiplap.
Can I make tongue and groove from plywood?
Tongue-and-groove plywood is superior to regular plywood for floor decks because it creates a stronger, more rigid subfloor, and helps eliminate sagging and “bounce” at the seams between the joists. But it is also more difficult to install because the tight-fitting joints don’t always go together easily.
What happens if you install subfloor upside down?
Upside-down Installation: Panels may be sanded on one or both sides. … Installing some panels with the trademark side up may result in a slightly uneven surface. If bulk water is present on the subflooring panels, drill drainage holes or sweep the water off.
What side goes down on plywood?
Install plywood underlayment smooth side up. To avoid damage to the surface, install underlayment immediately before laying the finish flooring.
Should I glue and screw subfloor?
The answer: Glue. Although using a subfloor adhesive (or subfloor glue) is not required by code, it is a standard practice that can help prevent floor squeaks by reducing the chance for movement at the panel-to-joist connection. A quality subfloor adhesive will also increase the overall stiffness of the floor.
Do you start with the tongue or groove?
Begin the first row of flooring by placing the planks with the tongue side facing the wall. Install the second plank next to the first by aligning the tongue into the groove and press the plank down to snap it in place.
Can you screw tongue and groove?
If you’re installing tongue and groove boards over drywall (or plaster especially), it’s a good idea to install 1×2 battens and fasten them directly to the framing with 2-1/2-in. screws. They’ll give you a much more solid nailing surface. … Also, the battens will somewhat flatten out uneven ceilings.
Do you have to stagger plywood subfloor?
Staggering a Subfloor Stability is more important than aesthetics when laying a subfloor, so it isn’t important to make the pattern random. When laying the plywood, install a full sheet along one edge of the floor, then start the next row with a half sheet and use a full sheet for the third row.
Why do builders use nails instead of screws?
Nails are often preferred for large projects, like house framing and installing hardwood floors, because they are typically stronger and less expensive than screws. Since most nails have smooth heads and shafts, they insert easily and speedily with a hammer or nail gun.
What screws should I use for plywood subfloor?
Most construction experts use 3-inch steel screws for plywood subfloors. To find out which length of screw you’ll need, you first have to know how thick the flooring is. You’ll want the screw to go about an inch past the plywood into the joist or underlying layer beneath it.
How do you fill gaps between plywood subfloor?
Fill Plywood Subfloor Gaps An effective strategy for filling large gaps is to mix patching compound to a stiff, mortar-like consistency, trowel it into the plywood subfloor gaps and wait for it to stiffen before troweling it smooth. Some sanding may be needed when it sets completely.
What causes plywood to buckle?
Buckling of wood structural panel sheathing such as plywood or oriented strand board (OSB) occasionally results when increased moisture conditions cause the wood to expand. Such buckling may occur between supports or between nails along supports. … This results in swelling or shrinking of the wood.
Can I put plywood over subfloor?
Underlayment can also help protect the finished flooring from moisture, mold, and mildew. Plywood is a great underlayment to install over a subfloor. It is strong and durable and often very smooth without a lot of imperfections or knots.
Can you put screws into plywood?
Plywood is used in most construction projects. … Putting screws into plywood is not difficult but care should be taken not to split the wood. There are many different types of plywood and screws. This procedure can be used with most combinations.
How many screws do I need?
The general rule of thumb for standard deck fasteners is 350 screws for every 100 square feet of decking, which is based on standard 6″ wide boards (5-1/2″ actual), and 16″ joist spacing.
What size screws 3/4 plywood?
As a result, you’ll need a longer size wood screw to help secure joints at the end of boards. This is one of the most common types of construction I do in the shop — attaching a sheet of 3/4″ plywood to a carcass made of 3/4″-thick lumber. The #8 x 1-1/4 screw is perfect for bringing these two boards together.
