The nail tip must not exceed the width of the floor joist it is being driven into. To avoid buckling, subfloor panels should be spaced with a 18inch gap at all edges and ends to provide room for naturally occurring expansion. May 21, 2010 patching a concrete floor is pretty easyif. Page 1 of 2 1 2 next mike antonetti i support tfp senior member. Lets back it up to the last update i gave you on the bathroom the vinyl adhesive tiles and the 14. And in some cases, its even possible to go right over the existing floor covering with a decorative concrete overlay or microtopping. As far as i can see, none explicitly state that the wood flooring can be nailed down through the levelling compound into the subfloor. Simply pouring wet concrete into a hole in your driveway, sidewalk, or basement floor wont make for a lasting repair. Learn how to use standard construction screws to attach wood or just about. Sweep the area with a broom or small brush to remove any loosened concrete.
Concrete floor video on how to install concrete over an existing wood subfloor. Over time, a sink or refrigerator water leak can damage and even destroy flooring materials and the subfloor below it. Always use a moisture bearer, which is usually placed between the subfloor and the finished floor. I am installing a wood floor and have some areas of the plywood subfloor that need to be levelled prior to installation of the wood floor. Pound nails into the subfloor with a hammer and set screws slightly below the surface of the subfloor with a screwdriver. There are three primary methods to installing floorboards on a concrete slab.
I am a general contractor and my sub is installing the vinyl flooring for me. Ideal for filling and leveling surfaces prior to installation of carpeting, vinyl floor. Filling minor holes in the cement can be timeconsuming, but it saves you time. All areas of the subfloor must be check prior to installation. Both hexhead and phillipshead styles are available. Permanent concrete repairs are possible, well, nearly permanent. It was crumbled, mildewed and in loose chunks two foot around the tub, and a foot around toilet and.
Plywood underlayment is a thin plywood material that is most commonly used under resilient flooring materials, such as vinyl and linoleum sheets and tiles. The concrete screw is also hardened, but it has tighter spirals in order to dig into the concrete. Then i roll out 6mil plastic and use clear plastic packing tape to seal the overlap of any seams in the plastic moisture barrier. Get a comprehensive breakdown on which materials to use, what to take into consideration and what steps to take for four subfloor systems. The experts show how to repair a waterdamaged subfloor. Whats the difference between selfleveling cement and floor. The trick to a longlasting concrete repair lies in bonding the new material to the old material. How to seal and patch your basement walls and floors. Patching and repairing subfloor at charlottes house. Gypsum concrete is a building material used as a floor underlayment applied over wood subflooring and concrete. Flattening a plywood subfloor the flooring guys in my neck of the woods use a long straight edge and bunch of scrape roofing shingels to flatten the floor before installing the hardwood.
A 1 x 4 wedged against the subfloor and nailed to the joist solves this problem. The basic rules of laying laminate flooring dictate that the subfloor over which it is laid must be completely clean, flat and structurally sound. The material will seep into the porous concrete like a first coat of paint would. Dricore subfloor panels are manufactured with a high density polyethylene moisture barrier that raises the 1532 core a 14 away from damp, cold concrete floors. Floated subfloor, alternate subfloor, gluedown subfloor and the naildown subfloor system. For ceramic tile, begin by nailing a layer of plywood directly into the floor joists. High airpressured or electric nail guns will definitely get the job done. I wanted to use the largest pieces of wood i could fit between the joists under the subfloor to disperse over the largest area possible any weight that will. Cut your block to fit snugly in place against the joist.
Do i need to repair cracks in concrete before laying. How to repair carpet tack strip holes in concrete hunker. Vacuum the entire room to remove all concrete dust and debris. I used a scraper and lightly hammered any spots that sounded hollow underneath to loosen any weak pieces. Underlayment covers subfloor flaws for the best possible results. If several boards in the subfloor above a joist are moving, securing them with a cleat, or a solid piece of lumber, works better than shimming the boards individually. Im all for a floating subfloor, where it is not anchored or glued to the concrete. One method, the sleeper on slab system, lost popularity 30 years ago because it. Do not use readymix concrete such as quikrete as this is not suitable for patching. One floating method developed by nofma prior to them being absorbed by the nwfa was to rip 34 sheets of cdx plywood into 16 x 8 panels, kerfed 38 deep every 12.
Im just focusing on patching the subfloor in this post to keep it simple. For small patching jobs, use a premixed concrete patch. Subfloor a subfloor is selected for structural purposes and is the substrate supporting layer for the underlayment. Tile came up with finger pressure, underneath was gypsum concrete gypcrete or pyrofill. Feb 14, 2018 sealing and patching your basement walls and floors is essential for stopping moisture, minor seepage, and eventual mold growth. An alternate is to lay out 6 mil polyethylene plastic sheeting and either float the plywood nailing base or screw or nail it down. Nailing underlayment on a subfloor the floor pro community. Smooth your cement subfloor before laying tile to ensure that the tile has a flat, even. Temperature changes, heavy weights, and dropped objects can all damage your concrete floor by causing cracks and holes.
Dricore subfloor is a simple doityourself solution to help you create a warm, dry, comfortable basement. Concrete is one of the most common types of subfloors found in homes. If installed correctly seams should not be patched, but sanded smooth. Wipe across the damaged concrete with a wire brush to remove cracked or chipped edges. That is a scc self consolidating concrete and should not be confused with a slu self leveling underlayment. Typically you can see where the nail line is on the subfloor, but obviously a stud finder can work too. The first step is to put some dead wood underneath the hole so you have a way to secure the patch. When and how to use plywood underlayment the spruce. How to choose the right subfloor leveling techniques the spruce. If you cant find premixed concrete patch, you can make your own by mixing one part cement to 2. To test your subfloor for moisture, you should always take a moisture reading. Preparing your concrete subfloor for tile or carpeting requires cleaning the area and ensuring the surface is level. How to fasten anything to concrete popular mechanics.
Repairing a damaged subfloor direct wood flooring blog. Plywood underlayment is typically needed when a floor material must have a very smooth, flat surface. House floor joists are generally about 8 to 10 inches wide, so nail length is not an issue. How to lay floorboards on concrete home guides sf gate. Repairing and leveling a 20yearold concrete subfloor concrete contractor only had two days to repair and level a severely cracked, 4,000squarefoot concrete subfloor february 18, 20. How to patch and level a concrete subfloor pretty handy girl. All wood and concrete subfloors must be flat within 18 over a 6 span, or 316 over a 10 span. Repairing minor holes in a cement floor before laying tile. While concrete is a strong construction material, it can still crack. How to level a subfloor for a hardwood floor install. Concrete screws come in 316 and 14inch diameter, in lengths up to 334 inches. Repairing minor holes in a cement floor before laying tile home. Cracks in the concrete will lead to an uneven surface for installation and will often produce dust that can contaminate the laminate and the material used to hold it in place. As the concrete settles, scrape the surface with a trowel.
Walk around the entire perimeter of the floor and identify any nails. However, for our purposes it cannot be used in the thin profile that we require a slu products to perform. For example, if you install resilient tiles or sheet flooring over a subfloor, any bumps, dips, or voids in the subfloor may be evident in the finished flooring. Once you have a good, sticky surface for the concrete, simply add water to premixed concrete and patch the crack. Installations over gypcrete lumber liquidators flooring co. While there are numerous choices for this situation, a twopart epoxy coating that allows vapor transmission is the best choice that i have found. Damaged concrete floors and subfloors can be repaired using a few different. How to patch or fix a broken concrete subfloor home guides sf. Start by completely removing the damaged materials.
Fastening wood flooring to concrete concrete fastening. However, garden shed or other outbuildings may only use twobyfours as joists. Click this link to watch tutorials on winder stairs installation. How to install a plywood subfloor on a concrete slab hunker. No matter the flooring, concrete subfloors should always be cured for at least 60 days before a flooring installation. How to repair concrete floors after removing tack strips step 1. Concrete bonding adhesive eliminates the need to roughen up the surface for the new concrete to adhere. Cover it with a thin layer of inexpensive thinset mortar to fill any voids between the plywood and the next. Scc is a new thing and an amazing thing to watch be placed. Filling plywood subfloor gaps does not call for an elastic material. Repairing and leveling a 20yearold concrete subfloor. Always follow the wood flooring manufacturers recommendation for a proper subfloor.
Stir concrete patching compound using a margin trowel or putty knife. Its also the subfloor that can hold in the most moisture. One method, the sleeper on slab system, lost popularity 30 years ago because it added too much height to the floor. Do i need to repair cracks in concrete before laying laminate. 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. If you use a readymix concrete patch, all you need to add is water. Fastening wood quickly and securely to concrete is a simple job with this method from my contractors bagotricks. An alternative is to remove the old flooring and underlayment down to the subfloor and start over. Its possible to expect a 20 30 year life expectancy from a properly executed repair. If the perimeter, as a whole, slopes to the side or middle, the repair project will usually be a major one requiring. Jan 16, 2017 fastening wood quickly and securely to concrete is a simple job with this method from my contractors bagotricks. Before beginning, mark the area where the nail will be set and use the powered gun to force the nail into the concrete. There are different lengths of concrete nail shank, and you should purchase the right type.
We installed radiant floor heating in our house with concrete over the subfloor tongue and groove decking subfloor with crawl space underneath. Use galvanized 8d nails or deck screws to fasten the new plywood to the floor framing. May 05, 2015 im just focusing on patching the subfloor in this post to keep it simple. Use a 316 inchhead ring shank nail to hold plywood underlayment for a subfloor in place. The purpose of the information is to outline ideal flooring options and applications over gypcrete. Gypsum concrete usage in the industry started in the 1980s due to the advantages over standard heavy concrete. Sleeperconstructed subfloor consists of wood subfloor installed over or on an existing concrete subfloor on or belowgrade without 18 of well ventilated air space. Step 5b spread and texture the concrete patch to match the surrounding concrete.
Installations over gypcrete the purpose of the information is to outline ideal flooring options and applications over gypcrete. Tongueandgroove edges on many premium floor panels, such as weyerhaeusers edge gold osb panels, are designed to selfgap. The subfloor is the foundation of a good flooring installation. The surface of the concrete must be flat and free of oil, grease, and dust. Repairing and leveling a 20yearold concrete subfloor for. Surface repair options for concrete floors and subfloors. Before pouring the self leveler there is some prep work required. The floor patch and leveler will remain flexible allowing the plywood subfloor to.
Most professional installers use two methods for attaching the subfloor to the concrete. To avoid buckling, subfloor panels should be spaced with a 18inch gap. How to level a subfloor for a hardwood floor install home. Its best to place the underlayment over 34inchthick plywood fastened with screws at 12 to 16inch intervals to help decrease deflection and add stability. I have looked at a number of products, such as mapei planipatch. To fill holes deeper then 14 inch, apply at least two layers of the cement patch. Scrub each hole in the floor thoroughly using a wire brush to smooth out the top. Whats the difference between selfleveling cement and. Jan 07, 20 patch and level a concrete subfloor preparing the concrete floor.
Screws are better used with other materials such as plastic, metal, and aluminum. Voluntary product standard ps195, construction and industrial plywood andor us voluntary ps 204 andor. Apr 18, 2017 i consulted with our contractor and then watched the heck out of youtube both of which confirmed that patching a subfloor is totally doable. Many people think that the new patching material will. 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. So even those with maybe mallet actuated pneumatic nailer. Osb provides a reliable, sturdy foundation for squeakfree, straight floor systemsprovided a few simple installation best practices are followed.
How to repair carpet tack strip holes in concrete step 1. When nailing, fix the nails in a pyramid pattern to prevent the sheets from buckling as youre nailing. Diy experts show how to get rid of a squeaky floor with these steps. The installation instruction requires patching at the seams and at the nailscrew heads. What are some methods that can be used to seal an osb subfloor from moisture. Concrete floors can be laid in basements or at ground level, while upperlevel subfloors generally consist of wood. Flattening a plywood subfloor jim, i will keep you posted on anything else, that i hear. Villa barcelona installation instructions engineered. Oct 29, 20 concrete screws come in 316 and 14inch diameter, in lengths up to 334 inches. Jul 17, 2017 concrete floors can be laid in basements or at ground level, while upperlevel subfloors generally consist of wood. May 14, 2018 learn how to install beautiful hardwood floors over a concrete slab. A special concrete nail gun can also be used to securely attach concrete nails by shooting them into the slab or wall. I was told about 3 days, but then i read about testing with a moisture meter and comparing with moisture levels in subfloor. As it relates to acclimating the flooring, how long do were you told to leave it inside before installing.
They lay the shingels in all the dips to fill them in. The goal is to make sure that the two pieces of subfloor dont move independently. Subfloor panels should conform to should conform to u. Use a circular saw set to 1 depth to cut the subflooring back beyond the damaged areas until you reach solid. High spots can be sanded or grinded down and low spots fill with appropriate patching compounds.
If the psi of the concrete is unknown, use the floated subfloor installation method or contact the adhesive manufacturer. Vinyl plank installations in mobile homes we ground down subfloor, usually osb which allowed the underlayment to lay tight, minimizing any nail pop out. Here are nine common subfloor installation mistakes and how to prevent them. Over lightweight concrete less than 3000 psi, if the flooring adhesive used has a higher shear strength than the concrete, use the floated subfloor installation method.
Is it possible to remove worn carpeting, ceramic tile or sheet vinyl from an existing concrete subfloor and then stain or polish it. Removing both of these things left behind obvious water damage and rot next to the bathtub and a hole in the floor where the plumber had capped off the bidet line. Forcing patch into the joints will cause telegraphing in resilients once the sheets expandcontract, breaking the patch at the joint. Nailing underlayment on a subfloor discussion in floor preparation started by mike antonetti, oct 15, 2016. After simple onetoone mixing of my two part epoxy i can mix one gallon at a time and easily apply it by myself without a problem, i apply the first coat with rollers and cut in with paint brush. I like to apply with 12 or 38 nap rollers for a nice, thick coat that is applied at a rate of.
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