I'd have to say totally fill-in the crawlspace & only do gravel & the concrete slab within the joist … Your friends are air flow and water-resistant materials. 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. Once you’ve made up your mind about installing a hardwood floor over your concrete slab, you need to put some thought into it. Drive 1 1/2-inch deck screws at six-inch intervals at each floor joist, using a power drill with a screw-tip attachment. As I understand your reply, I can simply shim the flat laid planks under the joists and not nail or screw them in place. Use 2-by-6 pressure-treated wood with the 5 1/2-inch side resting on the concrete. Some newer homes have manufactured, I beam–shaped joists. I've been advised that i could use H3 structural timber (140 x 45) as joists and lay decking boards on top that. Secure in place by nailing through the joist into the adjacent wall framing and/or diagonally through the side of the joist into the support plate at each location. Semi-tighten nuts - this will tighten the whole structure enough to withstand joists being inserted and secured STEP 7 - JOIST ADJUSTMENT. How to Install a Floating Wood Plank Floor . This is the first floor joist. Floating a hardwood floor, or engineered floor over concrete is more reliable. How to Install a Floated Subfloor Over Concrete. 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. Laying wooden joists on concrete floor. Secure each length of sill plate 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. Place them 16 inches apart. Step No. Pics of : Install Floor Joists Over Concrete Slab. This will give a minimum 1 1/2 inches space between the bottom of the flooring and the concrete slab, … Install the sleepers directly on the concrete and make sure the screws penetrate the surface by at least one inch. WOOD FLOORING PANELS ON CONCRETE In order for the installation to be successful, the concrete slab must be level and without flaws. 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. The new wood floor would also cover any moisture that finds its way in during the rainy season. This will be the first floor plate. This has helped, but the building is by no means waterproof. You can create a floor that is appealing and that will act a barrier between the cold cement and your interior. Lay pieces flat on the concrete slab, end to end, against the inside face of the wall. This summer, I want to put a wood floor over the concrete. 2: Protect the Sleeper System Do I need to put tar paper or something on the cement before the floor joists … Attach a floor joist to a concrete block wall, YouTube: Framing -- floor joists and walls, American Wood Council: Details for floor and frame construction. We don't want the plumbing from the new third floor residential units to penetrate through the existing roof slab (which will become the floor of the third level) so I've been asked to add what is essentially a furred floor on top of the concrete slab, to run the plumbing through and then bring the lines down in a couple areas near columns. Level the joist with cedar shims treated with a water-resistant sealer. I’m thinking to lay 6 mil poly over the old slab, and then 2″ of XPS over the poly, underneath the joists. Copyright 2020 Leaf Group Ltd. / Leaf Group Media, All Rights Reserved. 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 ). 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. The concrete slab installation is one of the simplest and most efficient ways to install radiant heat. After all, it’s just a garden shed. Jun 22, 2015 - Install a wooden subfloor to help insulate flooring from cold concrete. Normal spacing is 16 inches “on center” (from center to center), though some floors may have joists on 12-inch or 24-inch centers. How do I attach joists to the concrete? Mark each joist location with a pencil. Use heavy-duty staples or roofing nails to secure the mesh. Do level the floor by grinding/filling if the concrete floor does not meet the 3 mm in 3 m levelness criteria Installing a hardwood floor over a concrete slab Even if your home was built on a concrete slab, you can still enjoy the beauty and charm of hardwood floors. Alternatively, screw rows of treated 1x4s to the concrete 16 in. Adjust joist to correct height using dumpy or laser-level or string line. This will be cheaper and stronger than single boards. What is the current ‘best practice’ for doing this (e.g. 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 … Start Underlayment. 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. Do make end joints over support unless boards have a T&G end jointing end matching system. Rather than using decking, we suggest you use 3/4-inch tongue-and-groove plywood, commonly used for subfloors in new construction. wood floor over concrete than over a wood subfloor. It has a concrete floor that was poured in three sections, so there are seams and some parts are higher than others. I'm thinking of building a floor structure over the concrete. 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. Vinyl flooring is very durable and fits over most surfaces, including concrete. Them by 150 from ffl of the concrete. I just moved into an outdated 1959 ground flr maisonette with concrete floors. How to Install Vinyl Plank Flooring on Concrete. The back of the building faces upslope to a neighbor’s yard. Good ventilation and using the right stuff will give you a useful and comfortable man cave. Joist sizing and spacing are determined by building codes, which are based on engineering requirements. The pressure-treated sill plates can be secured to the slab with a powder-actuated nail gun, available for rental at most home improvement centres or construction rental stockists. With blocking complete, the joist structure is ready for subfloor utilities, insulation and plywood sub-flooring. Last year, I installed drain rock and perforated pipe to route the water away. This article teaches you how to build a floor for a house on a concrete foundation. I've been advised that i could use H3 structural timber (140 x 45) as joists and lay decking boards on top that. For applications where the floor joists run parallel to the concrete block wall, the floor joist that runs adjacent to the wall can be installed in the same manner as the ledger beam using concrete anchors. 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. Concrete sealer or concrete paint will do the job. Then treat the slabs with a water-repellent finish. That will leave approximately 2″-2.5″ of unvented space underneath the joists. We are putting new wooden joists … Like other flooring materials that work well over concrete slabs, laminate uses layers to fight moisture. If the sheathing is located over a concrete step or slab, the clearance may be reduced to 2 inches (51 mm) minimum. Define the area of the concrete slab to be covered with the floor assembly and the direction you plan to run the floor joists. 4" XPS gives you over R-30, and that's not bad for a floor. These half circles would allow circulation without totally compromising the strength/structural integrity of the floor joist. 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. 5.2 - Use shims to level if necessary, and if several thicknesses are required, glue shims together. Q: What is the best way to install a wood floor over a concrete slab?. Concrete Porch And Wood Siding Installation Tips Over Wood Floor Joist or Basement. 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. During the curing process, there is excess moisture still evaporating from the concrete that can ruin the floor if you install it too early. For more details on our payment terms and how to cancel, click here. The floor will be stout, to say the least. Cut lengths of "2 by 4" pressure-treated timber for each layout line chalked in steps 3 and 4. Q a insulated wood floor over concrete jlc online engineered wood flooring over concrete slab floors solid floating hardwood floor q a insulated wood floor over concrete jlc online 15 famous install hardwood floor on concrete bat unique flooring ideas bsi 082 walking the plank building science corporation engineered wood flooring over concrete slab floors solid floating hardwood floor. Instead, stick with a laminated wood floor instead. These plates will provide the incremental joist support across the floor area. It appears to be sloped away from the house, and seams to have been poured in two sections, one stepped higher than the other. Begin at the same end of each of the support plates installed in step 2 and use a tape measure to mark the first joist layout line on the plates at 39.4 cm (15 3/4 inches). 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. You will be charged . Here are some general guidelines to follow. 5.3 - Screw each sleeper at least 2" into the concrete slab. Heck, we’d get out the 4-inch hole bit and sink a hole in the corner so we could practice our putting on rainy days. Joists should be laid 19 inches on center. A: Your plan is more than reasonable: It’s good, but with a little modification. I know this sounds cheesy but I want to do this on the cheap. from the concrete slab to the bottom of the existing 2x4 floor joist. How to Put a Wood Floor on Concrete. Cut "2 by 6" joist blocking by measuring the distance between the joists where they are secured to the support plates at both ends. The procedure for installing a floor structure over a slab with "2 by 6" joists can be adapted to larger joist sizes if more subfloor space is required. If it is not, you can have a floor heating system that is inefficient, costly to operate, and may not work at all. After a good rain, a little water seeps in. Re: Floor joist over concrete slab I agree. Use a ¾” spacer between the plywood and the wall and a 1/8” spacer between panels. 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. Cut all the blocks for each space to the same measurement to insure each joist is straight and all the joists in the floor structure maintain alignment. The taller the joists the more room for insulation and warmth of the floor. You don't want cold air blowing into the open joist space. Check the slab under the plastic after 24-48 hours. Caulk the seams between the slabs with caulk made for concrete available at hardware stores and home centers. Is this reasonable? Floor joists, spaced on regular intervals, span the areas between supports such as walls, foundations, girders, and beams. I have a 13-by-20-foot outbuilding I use as a garden shed and "man cave." The slope is probably 2 to 3 inches over the length of the slab. However, you're not out of the woods: Concrete expands and contracts, and that type of movement can also crack the tiles and the grout. How to Install Engineered Wood Over Concrete. 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. Floor joists are typically 2 by 8s, 2 by 10s, or 2 by 12s; ceiling joists are usually 2 by 6s or sometimes 2 by 4s if it is an older home. If a powder-actuated nail gun is used for securing the pressure-treated sill plates to the slab, use safety glasses and follow all of the manufacturer's safety instructions. Your next job is to provide some ventilation. For some reason, the slab is just a mess. I plan to install some blocking around the edge of the room, so I have something to nail the subfloor to. Since this type of sub flooring is usually found in older homes and can loosen up over time from the boards expanding and contracting, it is very important to remember to re-secure these planks to the floor joists using 2-1/2" deck screws prior to installing any floor covering, as loose or damaged boards will affect the performance of the finished flooring. Step 3 Hold the end of the floor plate flat on the floor at each end and measure from the top surface of the floor plate to the line marked on the wall in Step 1. Insulating Split Level Ground Floor Concrete Slab Building There is a little over 2 in. Follow the installation instructions on the package, using the recommended glue or tape. Sort of like an addition to an addition, if I had to guess. Loading ... How To Form, Pour, And Stamp A Concrete Patio Slab - Duration: 27:12. Repeat steps 8 and 9 for each joist at each layout line marked in step 6. This would give me a nice level and flat floor that I can run wires under, duct work for HVAC, as well as give us a nice feel to the floor, instead of sub-floor and wood flooring right over a fresh level slab. The procedure for installing a floor structure over a slab with "2 by 6" joists can be adapted to larger joist sizes if more subfloor space is required. My plan is to put shims on the concrete to level it, then add new flooring on top. Do seal all edges, ends and faces of the timber flooring boards before installation. Follow the steps below to begin preparations for this process. These will be the end "sill plates" that support the ends of the floor joists. In a garage, this is typically at the back wall farthest from the garage doors. These are the layout lines for the intermittent support plates. Fasten the sheet with 2-1/2-inch coated … Install it flat on the slab surface, with the outside edge aligned against the side wall or the edge of the floor line. Due to the crawlspace being flooded many times over the past 10 years, the floor joists are shot. A little bit of work now will make a big difference in the long-run! These will be the end "sill plates" that support the ends of the floor joists. When this is the case, the floor joist against the block wall should be pressure-treated wood. Proper planning will save money, time and minimize mistakes. Pics of : How To Install Floor Joists Over Concrete Slab . Snap a chalkline to connect each pair of these layout lines. Follow these steps to install an engineered wood floor in your home. Before you run out and order a hardwood floor, there are several items you need know. My questions, 1. Paul Massey has been writing since 2009, drawing on a 35-year career in the construction industry. Install PEX tubing before pouring a concrete slab for the home, or install it when ... concrete over the PEX tubing to create a concrete slab. If the slab is in good condition it could be covered by a new layer of leveled concrete. Or, if this truly is a man cave, carpet it. A portion of the '97 UBC Section 2306.3 states, "When wood joists or bottom of wood structural floors without joists are located closer than 18 inches(457 mm) or wood girders are located closer than 12 inches(305 mm) to exposed ground in crawl spaces or unexcavated areas … Post author By admin; Post date February 22, 2020; No Comments on How To Install Floor Joists Over Concrete Slab; Framing a floor over concrete framing a floor over concrete decking sub floor over concrete framing a floor over concrete. Now, set the floor joists. Lay the 1x4s perpendicular to the direction you intend to install the floor planks. When converting a garage space into a living area, installing a framed wood floor offers an opportunity to add insulation from the cold concrete slab, access for electrical circuits to any interior walls being planned, and effectively provides a level floor platform over a standard garage floor that can be sloped 4 to 5 inches from front to back. When installing a ceramic tile floor on a concrete subfloor, you don't have to worry about flexing as long as the concrete slab is at least 1 1/8-inch thick, which most slabs are. increase the concrete floor to level you require by adding celotex insulation then screed or T & Grove boarding. A topping layer of gypsum concrete or lightweight concrete can be poured over the concrete slab to ensure that the floor is even. Attach joist support onto hex bolts and adjust to approx height required. While 1-by-6 planking would probably work out OK, we’d like something beefier. 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. (Note - you will need to loosen the nuts off if the joist support height needs adjusting) I’d appreciate any suggestions. If you’re moving into a brand-new home or you just poured the concrete slab, the concrete needs to cure before you can install hardwood flooring over it. This makes it a reliable option to install over your concrete slab. Use construction adhesive and concrete nails set with a .22-caliber concrete nail gun. Measure the overall length of the new floor and cut a length of "2 by 4" pressure-treated timber to this dimension for both sides of the room. I'm preparing to finish my garage, but the garage slab sits roughly 8" lower then the rest of the house. 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. Framing A Floor Using "I" Joists. This option will most likely just give your floor an additional 20mm. Position the floor joist cut in step 8 on edge at the end of the support plates the joist layout was started from in step 6. Use a chalkline to snap lines on the slab at the offset marks, parallel to the support plates installed in step 2. Install it flat on the slab surface, with the outside edge aligned against the side wall or the edge of the floor line. gregvancom. > I want to build a wood floor over the concrete slab. 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. But there’s a little prep to do before setting the joists and laying the floor. To install a floated subfloor system, first place a layer of plywood subfloor panels with the edges parallel to the wall. Begin at the chalkline marked in step 3 and mark the slab at the equally divided dimension determined in step 3 on both sides of the floor area. My proposed deck would be 350 x 370 with height from the slab between 17 - 18 cm so it stays flush with the brick and same level as my internal floor. 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. Hardwood timber flooring is guaranteed durable and is low maintenance. treated plywood to the concrete with concrete screws spaced every 16 in. Because some water is seeping into the shed, your first step is to make the slab water resistant. We will probably do surround sound in this room as well. Remember that water is the enemy. 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 remodelling a basement or garage space. 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. Place a laser level in the highest corner about 6 inches from the corner walls. Then fasten 3/4-in. My proposed deck would be 350 x 370 with height from the slab between 17 - 18 cm so it stays flush with the brick and same level as my internal floor. This will keep small critters from nesting under the shed. Install a vapor barrier, such as polyethylene film over a masonry garage or basement floor. For on-grade and below-grade installations, however, NWFA guidelines recommend a vapor retarder anytime you’re installing solid ¾” wood flooring over concrete. How do I attach joists to the concrete? Then drill four 1-inch ventilation holes in each bay between each floor joist at the rear and the front wall. Q: I have a fun project and I need an expert opinion. However, without any knowledge of its installation, it can easily be a nightmare for you. Nail cross-blocking boards to hold the joists together every 4 feet. Typically the joist direction is across the width or shorter dimension of the room or area. This option is also easier to install, not to mention, cheaper. A row of solid cross-blocking or "bridging" perpendicular to the joists should be installed 1.8 to 2.4 m (6 to 8 feet) apart over the length of the joists and at each end. Check the rooms adjacent for the ffl. It takes 6 to 8 weeks for concrete to cure, depending on climate and the concrete mixture. Item 6: Concrete or masonry slabs that serve as roofs or floor systems that are exposed to the weather are very susceptible to moisture from rain or snow. Homes built on concrete slabs are good candidates for solid wood flooring, provided that the slab does not wick up too much moisture. For the top flooring, I was considering 2-by-6 planks but wonder if I might get by with 1-by-6s instead. Space the joists according to standard space codes (no greater than 16 inches on center). Floor Joists. If you don’t like the look, paint the floor. Click here to view our full service details. This framing system can also be used for framing storage shed floors.This floor framing system is typical over basements and crawl spaces. Again, I’m not looking for high art, just clean and functional.