Overall, screws tend to be somewhat more expensive, but like nails, some offer better quality for a higher price. With that said, it’s imperative you choose a fastener compatible with your subfloor thickness and material. The quality and correct type of subfloor fastener can literally make or break your floor.
Steel Screws The proper steel screw sizes for securing 3/4-inch plywood to the floor joists are #8, #10 and #12 screws. The number refers to the thickness of the screw. Each is available in lengths from 1 1/4 to 3 inches. Typically, the 3-inch variety is used to secure plywood subfloors.
Additionally, can I use deck screws for subfloor? Deck screws are a good choice. Don’t use drywall screws; they’re prone to the heads snapping off. You can either drill pilot holes slightly larger than the screw diameter (through the thickness of the subfloor only) or use a self-drilling screw without threads on the top 3/4″-1″.
Accordingly, should you nail or screw a subfloor?
When you use a nail gun to attach subfloor sheathing to the floor joists, the nail sometimes misses the joist. Remember, nails can pull up; screws don’t. This gives us stronger floors that will not move or squeak.
How thick should a subfloor be?
the subfloors need to be thicker. For joist spacing of more than 16 inches up to 19.2 inches on center, the minimum thickness for both plywood and OSB is 3/4 inch. For joists spaced more than 19.2 inches on center, the minimum thickness for plywood is 7/8 inch and for OSB, 1 inch.
How long should subfloor screws be?
The 3/4-inch-thick subfloor takes a 2-inch screw. A thicker subfloor takes a 3-inch screw. Use a heavy-duty drill to drive Phillips head wood screws through the subfloor into the floor joists. Drive the screws approximately 8 inches apart.
How many layers of plywood do you need for a subfloor?
Personally, I would also make sure the floor joists are close enough together to give good support. Two plywood layers would span 24 inches in most cases, but if you want to get by with one layer, spacing the joists at 16 inch centers will give you a better floor.
Does subfloor need to be glued?
Glue. Although using a subfloor adhesive 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.
How thick should Plywood be for flooring?
The National Wood Flooring Association recommends a minimum plywood panel thickness of 7/8-inch for joist spans of 19.2 to 24 inches, and a minimum plywood panel thickness of 5/8-inch for joist spans of 16 inches or less.
How do you stop a subfloor from squeaking?
prev. squeaks occur when subfloor separates from joists. use shims for smaller gaps in subfloor and joists. Slide the Shim Into the Gap. use short screws to fasten subfloor and floor. Fasten the Subfloor to the Floor. locate squeak in floor and drive nail into joist. peel back carpet and use screw to subfloor.
Do I need to glue plywood to subfloor?
On the 3/4″ subfloor, you have the right idea. Use subfloor adhesive, and screw 8″ at edges, 12″ in field. For the 1/2″ underlayment, ideally, you want to screw every 6″ all across the panel. Adhesive will help you here, as the subfloor plywood will have voids in spots that will not hold a fastener.
How many screws do I need for a 4×8 subfloor?
Use 8d common nails, spaced 6″ apart on edges and 12″ apart in the field. 1 1/8″-1 1/4″ panels.
How do you nail down a subfloor?
Generally, nails (6d ring or screw shank, or 8d common) should be spaced 6 inches on center along supported panel edges and 12 inches on center on the panels’ interior supports, or as specified on the construction drawings.
Why are nails used instead of screws?
When deciding between nails and screws, keep in mind that nails are less brittle, so they provide greater shear strength. Screws, on the other hand, may not be as forgiving, but their threaded shafts hold better in wood and draw boards together much more tightly and they have greater tensile strength.
How do you fill gaps in subfloor flooring?
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.
Can I put new subfloor over old subfloor?
One of the benefits of removing the old flooring is it allows you the chance to fix any loose subflooring or squeaks by re-securing the main subfloor to the floor joists prior to installing the new flooring. With all that being said though the answer is YES you can install New Wood Flooring over the old.
What screws to use for floor boards?
Put the new board into position and secure it with 50mm of cut floor brads or ring-shanked nails, taking care to avoid existing holes in the joists. Then drill pilot holes for the nails, which stop any splitting. You could use 50mm countersunk screws (4mm or 5mm gauge) instead.
Does subfloor go under walls?
Moisture trapped under a building’s walls often rots the subfloor. Left alone, the moisture eventually destroys the joists below, and the wall’s plate above, the subfloor. A rotted area of the subfloor often extends under the wall.