Underlayment covers subfloor flaws for the best possible results. Hammer the new piece of plywood in place with 8d common nails every 6 inches being careful that. Vinyl concrete patcher is ideal for making smooth repairs to crack or chipped concrete floors, sidewalks or steps. Patching compound on plywood subfloor for laminate prep.
Plywood is made by gluing alternating layers of wood veneer. Then place a sheet of plywood cut at least 6 inches wider than the repair on all sides over the plastic. Patch and level a concrete subfloor preparing the concrete floor. In most cases, splintering is confined to the outermost or top layers of veneer. Osb on top of existing plywood and screw down to the joists, reason is to bring the floor up a bit to match what i am doing on the concrete portion. Theres a dip about 38 deep by 2 feet wide by 5 feet long. Before pouring the self leveler there is some prep work required.
I have seen many blogs and read a lot, and know it can be done, but, need. If there are only a few problem areas in the concrete, you can mechanically flatten them by grinding, beadblasting, abrading, or using a patching compound. Flattening a plywood subfloor jim, thanks for the information. A guide to subfloors used under wood flooring wood floor. Its best to place the underlayment over 34inchthick plywood fastened with screws at 12 to 16inch intervals to help decrease deflection and add stability. A plywood subfloor generally uses 12inch to 34inchthick sheets of plywood that have one rough side which faces down and one smooth side, which faces up. How to choose the right subfloor leveling techniques. Its only for plywood and concrete, but i tested some on my exposure 1 rated osb subfloor and it seems to work. The installation of calcium aluminate cement based selfleveling concrete, param 5500 along with expanded metal lath for reinforcement is a successful fasttrack method to convert a plywood subfloor into a beautiful concrete floor.
Standard plywood can be used for subfloors, but a better material is 34. Apr 18, 2017 use the piece of damaged plywood as a template and cut out a fresh piece of plywood. First place a sheet of plastic over the repair area. Jan 07, 20 patch and level a concrete subfloor preparing the concrete floor. Readytouse, latexbased product used to fill cracks, fastener or knot holes and level low areas in plywood subfloors or concrete surfaces. I have seen many blogs and read a lot, and know it can be done, but, need a bit of help. How to patch and level a concrete subfloor pretty handy girl. Plywood substrates can be resurfaced with selfleveling concrete to create beautiful. Its best to place the underlayment over 34inchthick plywood fastened with screws at 12 to 16inch intervals to help.
Plywood underlayment is a thin plywood material that is most commonly used under resilient flooring materials, such as vinyl and linoleum sheets and tiles. Ideal for filling and leveling surfaces prior to installation of carpeting, vinyl floor. Looking for dap flexible floor patch and leveler, 1 gal. On the other part of my floor which is on a plywood subfloor, i was planning to add a. Concrete floor video on how to install concrete over an existing wood subfloor. 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. Prepping a plywood subfloor is crucial for hardwood or laminate floors that last. For applications over cutback adhesive, sheet vinyl, terrazzo, ceramic tile or plywood, or. The joints between pieces of plywood on the subfloor might require reinforcing with 2by6 blocking if the plywood used did not have tongueandgroove edges. The first step is to put some dead wood underneath the hole so you have a way to secure the patch. Check out this tutorial for information on how to attach plywood to concrete as a floor base. Unlike a concrete subfloor, you can usually knock down high spots on a wood subfloor by sanding, and you can always fill depressions with patching compound.
Secure the plywood to the subfloor at 6inch intervals with 1inch deck screws placed along the edges. No matter the flooring, concrete subfloors should always be cured for at least 60 days before a flooring installation. Over time, a sink or refrigerator water leak can damage and even destroy flooring materials and the subfloor below it. Its what you dont see that is the most important part of a beautiful, longlasting hardwood or laminate floor. No matter the flooring, concrete subfloors should always be cured for at.
When you pulled them out, they left quarter sized holes in the. Traditionally, exterior grade plywood has been the subfloor material of choice for many bathroom flooring projects. Diy experts show how to get rid of a squeaky floor with these steps. Patching compound on plywood subfloor for laminate prep the. The floor patch and leveler will remain flexible allowing the. Grab your tools and get started on that longawaited home repair project. Tongueandgroove edges on plywood make the subfloor strong, as if a single piece of plywood was fit over the entire floor. A wellprepared subfloor is key to lasting hardwoods and laminates. The floor patch and leveler will remain flexible allowing the plywood subfloor to flex without cracking the filledin areas. How to patch or fix a broken concrete subfloor home guides sf.
A new layer of 58inch or 34inch tongueandgroove plywood subflooring is like adding a new subfloor over the old to create a stiffer, flatter surface for any type of finished flooring. Place bricks, concrete blocks or other items over the repair. Jan 17, 2019 this will show you how to cut out a bad place in your sub floor and how to frame it in to support your new plywood. Learn to install selfleveling concrete over plywood substrates along with learn to color and seal the concrete to create a polished concrete floor over plywood subfloor. The experts show how to repair a waterdamaged subfloor. Prepping a plywood subfloor for hardwood or laminate flooring. Concrete is one of the most common types of subfloors found in homes. Can i use leveling compound between plywood and cement. Rout or sand a downwardfacing 12inch bevel on the patch. Jul 25, 2019 there are two methods for dealing with these issues.
The recommended thickness of the plywood subfloor is governed by the spacing of the joists. Another option that you could utilize is installing plywood on top of the old subfloor. But even worse, in the foyer they had installed 34. I have read in some places that you need a vapour barrier to put over the concrete before installing the plywood and in other places to just glue the plywood to the concrete floor. Its also the subfloor that can hold in the most moisture. Small variations in height probably wont be felt under hardwood, but large ones will, and they can cause laminate sheets to separate.
How to prepare a subfloor for vinyl flooring home guides. Plan the layout of the plywood sheets so the long dimension of the plywood runs perpendicular to the floor joists. By putting in new plywood, you can effectively create a new, perfectly smooth surface to install your. This will show you how to cut out a bad place in your sub floor and how to frame it in to support your new plywood. A newer, easier, method is to lay down a floating subfloor made with special tongueandgroove panels of osb adhered to a base layer of plastic or rigid foam insulation. Repairing and leveling a 20yearold concrete subfloor. Use galvanized 8d nails or deck screws to fasten the new plywood to the floor framing. How to install a wood subfloor over concrete olde wood ltd.
Point is, look under the subfloor if you have reason to think there is hardwood there, like the house was built in 1901. Id like to install slate tiles over a preexisting plywood floor. 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. Product costs, availability and item numbers may vary online or by market. Can i use leveling compound between plywood and cement backer. The cost to replace, repair or install subfloors includes two components. How to make subfloor leveling with plywood and concrete self leveling compound mryoucandoityourself.
I have been researching a lot and would like to install a plywood floor over concrete in two bedrooms in our basement. Some experts suggest that 1532inch plywood should be standard if the underlying floor joists are spaced 16 inches apart or less, but slightly thicker 34inch plywood should be used for joists spaced further apart. Plywood has been a standard subfloor material since the 1950s and remains the preferred subflooring for many builders. Oct 14, 2019 prepping a plywood subfloor is crucial for hardwood or laminate floors that last. Jan 26, 2020 unlike a concrete subfloor, you can usually knock down high spots on a wood subfloor by sanding, and you can always fill depressions with patching compound. Patching and repairing subfloor at charlottes house. Vinyl concrete patcher is made of a special blend of vinyl resin, fine sand and portland cement. Im just focusing on patching the subfloor in this post to keep it simple. Filling plywood subfloor gaps does not call for an elastic material.
Use the piece of damaged plywood as a template and cut out a fresh piece of plywood. Do i use the patch in the gaps between the plywood sheets. Ideal for filling and leveling surfaces prior to installation of carpeting. How to choose the right subfloor leveling techniques the spruce. By putting in new plywood, you can effectively create a new, perfectly smooth surface to install your flooring on. I was worried about the levelers breaking up and your answer confirms my. Mix with water to patch and level concrete or plywood as thick as 12 mm. Cut out the patch border approximately 1 inch larger than the hole you are patching. I was worried about the levelers breaking up and your answer confirms my concerns. Aug 04, 20 i have been researching a lot and would like to install a plywood floor over concrete in two bedrooms in our basement. To test your subfloor for moisture, you should always take a moisture reading. If the perimeter, as a whole, slopes to the side or middle, the repair project will usually be a. Need some advice to install a plywood floor over concrete. Bracing subflooring from the underside of the floor ehow.
How to level an uneven osb subfloor before laminate. Rout or sand an upwardfacing 12inch bevel along the edge of the hole. It has strong adhesive properties allowing it to be applied down to a featheredge. If the entire slab is uneven, you may have to use a selfleveling concrete compound to smooth it out. The traditional method is to fasten 2x4 sleepers to the concrete, then cover the sleepers with plywood subflooring. Do i worry about the compound leaking down under the subfloor at the seams. The installation of calcium aluminate cement based selfleveling concrete, param 5500 along with expanded metal lath for.
Cut out patches for holes from identicalthickness plywood using the coping saw. 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. Plywood underlayment is typically needed when a floor material must have a very smooth, flat surface. Hammer the new piece of plywood in place with 8d common nails every 6 inches being careful that you are nailing into the board you screwed into the floor joist. I used a scraper and lightly hammered any spots that sounded hollow underneath to loosen any weak pieces. Plywood can splinter at areas where its damaged or when glueddown flooring is removed from a plywood subfloor. What are some methods that can be used to seal an osb subfloor from moisture. My plan was to fill it with selfleveling compound, before installing the cement backerboard and then the tiles. Is patching compound the appropriate product to use to flatten a plywood subfloor. Types of subfloor materials in construction projects.
How to fix splintering plywood home guides sf gate. Fortunately, this is not an uncommon issue with concrete subfloors and products exist to turn your subfloor into a solid surface once again. Concrete resurfacing over plywood substrate duraamen. How to install a wood subfloor over concrete with screeds engineered wood flooring less than. I did find one interesting and extremely expensive product called dap flexible floor patch. This method is easiest if you are dealing with a wood subfloor, but it can be done on top of concrete if need be. It was crumbled, mildewed and in loose chunks two foot around the tub, and a foot around toilet and. When you pulled them out, they left quarter sized holes in the hardwood. The floor patch and leveler will remain flexible allowing the plywood subfloor to. Keep them in place for the duration of the cure time recommended for the epoxy resin. Although it would be interesting to experiment with the dap product, because it claims to be a flexible, not cement based.
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