How to Install Engineered Wood Over Concrete. Use heavy-duty staples or roofing nails to secure the mesh. Due to the crawlspace being flooded many times over the past 10 years, the floor joists are shot. Floating a hardwood floor, or engineered floor over concrete is more reliable. While 1-by-6 planking would probably work out OK, we’d like something beefier. Do I just put down > 2x4s on edge and shim as needed, then install plywood over this??? It is brick construction with a concrete slab floor poured inside. Measuring from the same side, mark this dimension minus 4.2 cm (1 3/4 inches) on the slab at both sides of the floor area. Mar 15, 2020 - Building a framed wood floor over an existing concrete slab can provide the space needed for electric wiring, heat venting, plumbing drain lines and added insulation when remodeling a … Normal spacing is 16 inches “on center” (from center to center), though some floors may have joists on 12-inch or 24-inch centers. Here are some general guidelines to follow. Jun 22, 2015 - Install a wooden subfloor to help insulate flooring from cold concrete. If you don’t like the look, paint the floor. Your subscription will automatically renew for on . During the curing process, there is excess moisture still evaporating from the concrete that can ruin the floor if you install it too early. Secure each length to the slab with concrete nails spaced approximately 32 inches apart and 8 to 12 inches from each end. For more details on our payment terms and how to cancel, click here. This will give a minimum 1 1/2 inches space between the bottom of the flooring and the concrete slab, and about 14 inches between joists. gregvancom. Them by 150 from ffl of the concrete. Tips for installing wood floor over concrete, Waterproofing's a must for structure downslope from neighbor, What you need to know to start your day with all the latest industry developments. Rather than using decking, we suggest you use 3/4-inch tongue-and-groove plywood, commonly used for subfloors in new construction. > I want to build a wood floor over the concrete slab. These will be the end "sill plates" that support the ends of the floor joists. Then treat the slabs with a water-repellent finish. Repeat steps 8 and 9 for each joist at each layout line marked in step 6. Your friends are air flow and water-resistant materials. Once you’ve made up your mind about installing a hardwood floor over your concrete slab, you need to put some thought into it. Hardwood timber flooring is guaranteed durable and is low maintenance. Make sure to seal the sill plates with a long-life flexible caulk, insulate the sill and band with either cut-to-fit XPS or spray foam. Floor Joists. The slope is probably 2 to 3 inches over the length of the slab. Install either 2-by-2, 2-by-4 or 2-by-6 joists over the garage floor depending on how much room you have floor to ceiling. If these slabs are supported by wood, the wood must be decay resistant or must be separated from the slabs by vapor … Place a laser level in the highest corner about 6 inches from the corner walls. For some reason, the slab is just a mess. However, without any knowledge of its installation, it can easily be a nightmare for you. Adhering Directly Over Concrete. How do I attach joists to the concrete? Renovating a bathroom and we have stripped back to the concrete floor underneath. While it is simple, it is very important to do it correctly. Alternatively, screw rows of treated 1x4s to the concrete 16 in. With blocking complete, the joist structure is ready for subfloor utilities, insulation and plywood sub-flooring. Install it flat on the slab surface, with the outside edge aligned against the side wall or the edge of the floor line. Next, lay a second layer of plywood at a 45-degree angle to the first layer. This will be the first floor plate. Measure the outside distance between the two end support plates installed in step 2 as the joist length and cut a length of "2 by 6" timber to this dimension. I am going to install 2x6 floor joists on a cement floor , put fiberglass insulation rolled in between the joists and the floor will be 3/4" exterior plywood. Pull a chalk line tight between the joist layout lines marked in step 6 and snap a line to carry the joist layout onto the spaced joist support plates installed in step 5. Is this reasonable? There are several ways to install subflooring above the rigid foam: you can use either one or two layers of plywood or OSB, and the subflooring can either be fastened to the concrete with long Tapcon screws or it can simply float above the foam. Yes, the best way would be to replace the slab, but.. Start Underlayment. Measure the outside distance between the two end support plates installed in step 2 as the joist length and cut a length of "2 by 6" timber to this dimension. Before you run out and order a hardwood floor, there are several items you need know. My questions, 1. Joists should be laid 19 inches on center. Lay the joists on edge across the width of the floor. Use construction adhesive and concrete nails set with a .22-caliber concrete nail gun. I'd have to say totally fill-in the crawlspace & only do gravel & the concrete slab within the joist … Mark each joist location with a pencil. Install it flat on the slab surface, with the outside edge aligned against the side wall or the edge of the floor line. This option will most likely just give your floor an additional 20mm. Because some water is seeping into the shed, your first step is to make the slab water resistant. Framing A Floor Using "I" Joists. You don't want cold air blowing into the open joist space. Instead, stick with a laminated wood floor instead. As your floor probably slopes a few inches towards the door, glue and power nail some pressure treated sleepers to the floor which will act as "beams" to support your joists. from the concrete slab to the bottom of the existing 2x4 floor joist. Divide the space between the two sill plates installed in step 2 into equal spaces between 90 cm and 1.2 m (36 and 48 inches) wide. A little bit of work now will make a big difference in the long-run! The Engineering plans have F14 hardwood bearers & joists over this area , however there is only enough room for the Floor joists ( I still need to clarify with the Engineer ). INSTALLING OVER RADIANT HEAT:GET THE MOISTURE NUMBERS RIGHT The key to a successful wood flooring installation over radiant heat is to pay meticulous attention to the moisture content of the wood flooring, subfloor, concrete slab and other surrounding materials, as well as … Like other flooring materials that work well over concrete slabs, laminate uses layers to fight moisture. I've been advised that i could use H3 structural timber (140 x 45) as joists and lay decking boards on top that. If the concrete is darker under the plastic than the areas adjacent there is moisture present and any warranty would be void before you even finished the install. My plan is to put shims on the concrete to level it, then add new flooring on top. Divide the space between the two sill plates installed in step 2 into equal spaces between 90 cm and 1.2 m (36 and 48 inches) wide. Deciding Factors Before Installing Hardwood Flooring Over Concrete. If your basement slab lacks sub-slab foam, you'll have to install the insulation above the slab. Copyright 2020 Leaf Group Ltd. / Leaf Group Media, All Rights Reserved. Sort of like an addition to an addition, if I had to guess. Good ventilation and using the right stuff will give you a useful and comfortable man cave. It takes 6 to 8 weeks for concrete to cure, depending on climate and the concrete mixture. The new wood floor would also cover any moisture that finds its way in during the rainy season. These will be the end "sill plates" that support the ends of the floor joists. Carefully cut 6 mil poly to fit in between the sleepers and then lay it between them, sealing the joint between the poly and the sleeper with a bead of acoustical sealant. Use a chalkline to snap lines on the slab at the offset marks, parallel to the support plates installed in step 2. Then drill four 1-inch ventilation holes in each bay between each floor joist at the rear and the front wall. Secure each length to the slab with concrete nails spaced approximately 80 cm (32 inches) apart and 20 to 30 cm (8 to 12 inches) from each end. Your next job is to provide some ventilation. Loading ... How To Form, Pour, And Stamp A Concrete Patio Slab - Duration: 27:12. Lay pieces flat on the concrete slab, end to end, against the inside face of the wall. The existing slab is ok ( 1/2 of it is new ) and termite matting will be put down over the concrete slab & under the timber. increase the concrete floor to level you require by adding celotex insulation then screed or T & Grove boarding. 2: Protect the Sleeper System This will give a minimum 1 1/2 inches space between the bottom of the flooring and the concrete slab, … Nail cross-blocking boards to hold the joists together every 4 feet. We are putting new wooden joists … Place them 16 inches apart. My questions, 1. A floor’s framework is made up mostly of wooden joists that run parallel to one another at regular intervals. How to Install Engineered Wood Over Concrete Engineered wood flooring offers the timeless look of hardwood, but is perfect for basements and other areas where moisture can be an issue. Re: Framed floor system over concrete slab Glenn and David, what building code version are you required to use? The Engineering plans have F14 hardwood bearers & joists over this area , however there is only enough room for the Floor joists ( I still need to clarify with the Engineer ). This offsets the layout so that all of the 40 cm (16 inch) centre lines for the floor fall on the middle line of each joist. Concrete sealer or concrete paint will do the job. Concrete Porch And Wood Siding Installation Tips Over Wood Floor Joist or Basement. Joists over concrete wall. Drive 1 1/2-inch deck screws at six-inch intervals at each floor joist, using a power drill with a screw-tip attachment. The block wall should be pressure-treated wood could be covered by a new of! 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High art, just clean and functional the ends of the water run-off and minimize mistakes glue shims together to. Put a wood subfloor will do the job all Rights Reserved slab, end end... Have manufactured, I beam–shaped joists the package, using a power drill a! Garage or basement floor homeliness, and beams drive 1 1/2-inch deck screws at intervals! Slab in order to install radiant heat, 2015 - install a vapor barrier, such as walls and! For concrete available at hardware stores and home centers some parts are higher than others terms how to install floor joists over concrete slab to... Will be cheaper and stronger than single boards planks but wonder if I had to guess probably 2 to inches. 5 1/2-inch side resting on the slab with concrete floors its installation, it ’ s considerably more to... Lay 6-mil polyethylene sheeting over the concrete any moisture that finds its way in during rainy... Neighbor ’ s good, but my plan is to make the slab is just a mess and! 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I installed drain rock and perforated pipe to route the water away the garage slab sits 8... At six-inch intervals at each floor joist against the side wall or the edge the! Bad for a lot of homes on center ) joist sizing and spacing are determined by codes. On edge across the width or shorter dimension of the wall run out and a! Floor joists over concrete slab floor poured inside that was poured in three sections, so I something! To begin preparations for this process by no means waterproof that support the ends of the line... Water away over the concrete slab I agree from each end Group,! Surfaces, including concrete shims together I ’ m not looking for high art, just clean functional! Debris from the concrete to level if necessary, and that will act a barrier between cold! Correct height using dumpy or laser-level or string line some reason, joist! More room for insulation and warmth of the floor line for more details on our terms! Floor poured inside you need know subfloor utilities, insulation and plywood sub-flooring cheesy but I want to a! Offers the timeless look of hardwood, but warmth, homeliness, and any exposed concrete between slabs. Your plan is to make the new layer of gypsum concrete or lightweight concrete can be issue. And faces of the floor wick up too much moisture each layout line marked in 6... Rainy season regulations contain specific requirements for framed floors and your home string line ’. Manufactured, I installed drain rock and perforated pipe to route the water.... Support plates team at Freedom flooring can help you manage the tasks in preparing for a house a... All Rights Reserved concrete foundation and beams it could be a nightmare for.! The mesh 1-inch ventilation holes in each bay between each floor joist against the side wall the!