I'm installing OSB sheets over an old subfloor in a 3 unit building in Brooklyn. Ok so the floor guy at the store told us to nail down our subfloor that we are putting over our old subfloor. MrMarkyMark Member. Replacing the subfloor in my house, it’s the old plank boards and a bunch of them are cracked/broken. Screw or Nail Subfloor This may seem like a crazy question, but I want to add some extra screws or nails to attach a plywood subfloor (3/4" T&G) to joists. Apply subfloor adhesive to the floor joists and the channels of the subfloor boards. Embed the cement board in latex-modified thin-set mortar The main reason for using thin-set between the cement board and the subfloor isn’t as much for bonding as it is for even, void-free cement board support throughout the floor. Here's the problem: the head of a screw is a vitally important part of the screw. On the 3/4" subfloor, you have the right idea. I finally snapped chalk lines and drilled and countersunk holes in my bathroom underlayment and used my drywall gun to screw the underlayment down with 1 1/4 inch drywall screws. Laminate Floor Chipping Similarly, do you nail or screw subfloor? Main Features. Instead of screws. 9, 2 1/2 inches long with a Phillips head. Most screw heads are larger than a corresponding nail head. This also allows you to use a battery operated drill/driver without the screw thread shredding your finger tips. Putting down 3/4” plywood and was going to use liquid nail with either nails or screws, just haven’t decided which one yet. There’s good reason to trust AdvanTech subflooring — a combination of long-lasting strength, moisture resistance and nail-holding power. Typically, the 3-inch variety is used to secure plywood subfloors. Nail or screw the panels to the joists with 2-inch galvanized nails or decking screws -— do not use drywall screws. If the distance between joists (nail heads) is 16 inches or up to 19 1/2 inches for engineered joists, the subfloor is probably 3/4 inch thick. This releases any trapped pad under the screw head and allows the carpet to lie flat. When attempting squeaky floor repair without access to subfloor, drill pilot holes and nail through the surface. The remaining screw threads can't last very long, if at all. To nail down the subfloor, always use a mechanical system such as a powder load or pneumatic pressure nail gun. Also use PAZ screws (passivated). Subfloor Nail / Screw. The contractor suggests using screws in lieu of nails. I will then put tongue and groove hard wood floor over this. See the IAPMO report #0133. Each is available in lengths from 1 1/4 to 3 inches. xyyy (Structural) (OP) 29 Oct 14 15:58. Before installing a wood subfloor, a moisture barrier should be placed on the slab to protect the subfloor and the flooring from moisture. Re: Subfloor screw down questions The deck screw for the Makita auto feed gun work well. ... plus 18mm. Set any “proud” nail- or screwheads. 3. Your weight helps a lot in avioding bridging or jacking, where there is a gap under the sheet and the screw threads prevent … See the reports. This increases the pull of the screw head on the sheet downwards onto the joists. I wanted to use screws my husband said just nails. less than the thickness of the entire floor, and buy screws 1/4 … Lastly, use putty or wood filler to fill the tiny hole left behind. use short screws to fasten subfloor and floor. Plywood floor - nail or screw? some say nail, some say screw! It's important that the screw is designated as a structural screw or a deck screw. For the 1/2" underlayment, ideally, you want to screw every 6" all across the panel. 1.Some kind of screws with a screw gun and glue? Many builders glue and nail their subfloor and then come back and screw it down with 2" or 2-1/2" screws. Although this doesn’t normally happen, if you nail, screw, or glue down laminate flooring to the sub-floor, it is a possibility. We have fasteners classified as Multiple Use for NWPCA, pallets, crates, and other wooden structures through Virginia Tech Testing. All three floors of the building will be covered. pilot hole about 1/2 in. When you attach the subfloor or plywood, stand on the sheet you are screwing down. You can see in this picture that the plywood sheets making up the subfloor in this house are tightly joined together. How to Install Nail-Down Engineered Wood Flooring When there’s a wood subfloor in place in the form of plywood or OSB, then a nail-down or staple-down, rather than glue-down installation is the best way to go. Joined: 27 Apr 2020 Messages: 19 Thanks Received: 1 Country: Perhaps a happy medium in the subfloor nail versus screw debate, SubLoc Pro Scrail Fasteners offer a hybrid between the traditional nail and screw. Some of the nail head were sticking up above the subfloor, and on one panel it had not been attached to one joist at all. We have IBC and IRC code approved fasteners for subfloor and shear wall. This pulls the sheathing tight to the framing so that the threads don't maintain a gap between the two as often happens with standard screws. use shims for smaller gaps in subfloor and joists. whats the best type of screw to use for 3/4"osb subfloor and the best type of nail? A bit longer at 2-1/2 inches, it has the length and the bite to work on most subfloor applications. 3. Combining the versatility of a nail with the hold strength of a screw, they can be used with most framing nailers – meaning these subfloor fasteners can be driven much faster than screws. squeaks occur when subfloor separates from joists. peel back carpet and use screw to subfloor. Mark the depth of the pilot hole on a 1/8-in. prev. Slide the Shim Into the Gap. Other screw types appropriate for studs are specialized and may be harder to find and more expensive. Locate the floor joists and nail directly into them for a fastening job that won't work loose. Discussion in 'Floors, Stairs and Lofts' started by HadAGo, 17 Oct 2020. The floor is two layers of plywood. For tongue and groove don’t glue. I was out at the house last night and could see the framers missed the joists with many nails. I specified #8 nails for fastening plywood to wood floor joists. A nail is designed to hold things together and have a strong shear force. Do not nail into the joist, the goal is to pull down the underlayment so it makes full contact with the subfloor between the joist. This would have likely proved fatal to the tile installation. Any suggestions? 3. The number refers to the thickness of the screw. Before deciding on the length of the screw to use, first determine the width between the joist and the hardwood floor. For chipboard subfloor, joints need to be glued and screwed over a joist/noggin. They have an agessive thread on the bottom 2/3 of the screw and a fine thread on the upper part of the screw. Ensure you have completely driven the head of the screw into the hardwood floor. Eliminates subfloor nail squeaking and costly call-backs; Variety of lengths to cover subfloor… Combined with the polyurethane bond of AdvanTech subfloor adhesive, the AdvanTech Subfloor Assembly offers a panel-to-joist connection so powerful you won’t hear a squeak, guaranteed. drill bit with tape. The type of screw I recommend is one where the thread ends before the head about the thickness of the subfloor. Either secret nail through the tongue or screw from above. What do you recommend? The subfloor was glued and screwed with 3.5" deck screws to the 2x10, joists, 16" OC, six years ago so the framing lumber should be stabilized by now. Use subfloor adhesive, and screw 8" at edges, 12" in field. I'd go for 8d (bright) ring shanks and subfloor adhesive, no smaller, no larger. locate squeak in floor and drive nail into joist. The shear force means sliding forces applied against the two pieces the nail is holding together. When you rip off the screw head, you remove the part meant to do the holding! There is a few squeaks that we need to fix in the floor right now as well. Best screws for OSB3 subfloor. For a more permanent solution, however, you’ll usually have to screw the subfloor to the wood flooring from below. Fasten the Subfloor to the Floor. Hey guys, framers are about to lay down plywood subfloor and intend on using on gluing and nailing to joists. Some screws are never a bad idea either just to keep things from squeaking. Discussion in 'Carpenters' Talk' started by MrMarkyMark, Aug 23, 2018. The most common screw for joining two-by-fours is hardened steel, structural, No. You can snap a chalk line across the joists to make nailing simpler. The main differences between a nail and a screw are what they are designed to do. We are installing hardwood floor over top and i thought screws would be more sturdy but im not sure. Plywood underlayment is a thin plywood material that is most commonly used under resilient flooring materials, such as vinyl and linoleum sheets and tiles. Don’t slide the planks in the groove and smear the glue when installing the boards, just set the sheet lightly in place. Remember not to nail towards the last 10″ of the tongue side until the next sheet is installed. When you use a nail gun to attach subfloor sheathing to the floor joists, the nail … Plywood floor - nail or screw? I have a light framed wood office building. Beginning at the center to prevent bowing, fasten the subfloor using a 12” x 12” grid on the interior and every 6-8” along the perimeter (2” from the panel edge). Drive in screws from the hardwood floor right to the subfloor, or the joist. Drill a 1/8-in. Countersink the screw head into the subfloor. The Simpson WSNTL is a solid screw with a few basic enhancements that make it reliable. The question is what should I use to fasten this subfloor to the old subfloor made of wood strips? It can also be used under hardwood, laminate, and carpet, but this is much less common these days because subflooring is typically smooth enough for these materials, many of which are installed with a different type of underlayment or pad. The floor was not finished but was in like new condition, before it was lightly sanded last week, to eliminate high spots. This is the typical way I saw. ... Nail or screw the sheets into the joists or sister boards from one end to the other without creating dips or bellies. It's easier to spend a few minutes adding some screws than to have problems later and have to explain why I didn't thoroughly check the subfloor. Fixing parts or the whole laminate floor will not allow it to move as a whole unit and it can separate at the joints as each planks adjusts or contracts when humidity levels goes down. The screw has a powerful grip force due to its threads. Put a nail every 8-10 inches on the surface. Just wondering if screws are usually used or are nails okay. Adhesive will help you here, as the subfloor plywood will have voids in spots that will not hold a fastener. zim HadAGo. 3/4 '' osb subfloor and joists have IBC and IRC code approved fasteners for subfloor and joists and! 3-Inch variety is used to secure plywood subfloors keep things from squeaking joists many! Shredding your finger tips a fine thread on the 3/4 '' osb subfloor and the to... Access to subfloor, drill pilot holes and screw or nail subfloor through the surface its threads pad under the head... Them for a more permanent solution, however, you want to screw panels... 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