Instead, use a concrete or fiber board. Durable substrate for 1. void-free underlayment grade panels, which both stiffen the existing floor and provide uniform support to prevent cracks in the tile above. Oriented strand board, or OSB, and exterior-grade plywood will work if first covered with a latex-modified mortar and a tiling backerboard. Underlayment must be set in a mortar bed Oct 27, 2014 · This article examines tile applications outside the building. DITRA-XL (5/16”): Allows you to install ceramic tile over a single layer of plywood or OSB subfloors on joists with wider spacing such as 24 inches on center. Answer: No. TROBA-LEVEL™ is a configurable, easy-to-install system for tile pavers. ‡ EXTERIOR APPLICATION • Exceptional tile bond • Noncombustible • Warranted for interior and exterior application Water durable and mold resistant, with better tile bond than fiber-cement boards or bare plywood, USG Durock ® Brand Cement Board with EdgeGuard™ cement board is an outstanding backerboard for a wide variety of reasons. Remember that exterior tile systems over inhabited space need a waterproof substrate below the tile. The best choice depends primarily on the intended use, but budget can also be a consideration. 0216 nominal Lead-coated high-yield copper tile (VCT), self-stick tile, laminate surfaces, metal or fiberglass surfaces, or poured epoxy floors. This system is designed for use over roof waterproofing membranes. WATCH THICK SET METHOD VIDEO. HydraFlex Waterproofing Crack Isolation Membrane is a ready-to-use, flexible, mold and mildew resistant waterproofing crack isolation membrane for interior and exterior applications. Figure A and Figure B are typical examples of exterior wall tiling. In most cases 4-by-8-foot sheets of particle board or plywood must be installed in preparation for the vinyl floor install. Fortunately, the bonding problem is easily 6 Plywood Design and Application Guide SPAN RATINGs Span rating numbers for SHEATHING SPAN and FLOOR SPAN indicate the maximum spacing of supports over which the panels should be placed. 3 Attach and Arrange Cement-Based Backerboard to Wood Subfloor Oct 02, 2009 · Vinyl flooring is usually not installed directly over the subfloor in residential applications. 25c Fiberboard siding 0. To help illustrate how to install wall tile outdoors, we've included the diagram below. Download Thick Set Method PDF. Thinset mortar is the primary method for installing ceramic or stone tiles onto new surfaces, acting like cement to bond the tiles into their new homes. There are tile companies that actually use 3/4″ exterior rated plywood as Building Code limits tile on exterior walls to less than 24" on one Plywood and OSB are not suitable surfaces for installing tile on walls and foam does not tile and grout, and help protect the building envelope from water intrusion through. Firstly, and very importantly, porcelain tiles have different grades and Exterior plywood (with sheathing) 0. Flooring: For ceramic tile floors, the cement board usually rests on a plywood subfloor (minimum 5/8-inch-thick exterior-grade plywood or OSB). Staple-attach 15-lb. 21 Feb 2018 Use over polyethylene uncoupling membranes and sound: properly prepared concrete, exterior grade plywood (interior/ dry use only) NOTE: For installation of large bodied wall tiles the product should be mixed to a stiff Use minimum 1/2 in exterior grade plywood or equivalent, positioned across the installation instructions, TCNA guidelines (Tile Council of North America When installing outdoor tiles over wood deck surfaces, make sure you have deck flooring this is up to (80) $3. Make your selection based on the type of project you’re working on. • Do not apply directly over substrates consisting of plank wood flooring, presswood, particleboard, chipboard, oriented strand board (OSB), pressure-treated plywood, oil-treated plywood, Luaun plywood, Masonite flexible Waterproofing and Tile Doctor Tip: Most industry standards for the specification of flooring methods are found in the current issues of the Tile Council of America's (TCA) Handbook for Ceramic Tile Installation, American National Standards Institute (ANSI) Manual, and the Marble Institute of America's Design Manual. when using particle board underlayment over a subfloor other than exterior-grade plywood. In addition, DITRA-XL and standard 5/16” tile creates a floor height that is level with standard 3/4″ hardwood flooring. Interior-grade plywood and particleboard 24 Apr 2013 Take a minute to read through how to install tile correctly if you're in the setting tile over exterior grade plywood, this may mean the difference Adhere tile, stone or thin brick directly to PermaBase in exterior applications – saving time and money . Plywood is sold in various ratings, grades and sizes. 8 Nov 2010 Exterior plywood contracts and expands, which makes it hard to bond with other materials. g. 25c Fiber cement panel siding 0. Installation 1/4", 1/2", 5/8" Cover plywood base with USG Durock™ tile membrane, 15 lb. Current pneumatic nailers have maximum fastener lengths DITRA is specifically designed to allow the installation of ceramic and stone tile over any even and load-bearing substrate. The go-to product is 1/2-in. 17 Dec 2019 Common exterior substrates include masonry, concrete, mortar bed and cement backer board over framing. The integration of DITRA’s uncoupling, waterproofing, load-distribution, and vapor management functions makes consistent results viable. It can stain, warp, swell, and suffer from problems with mold and mildew. An integral subsurface drainage component provides for elimination of infiltrated water. AdvanTech. Having trouble removing all of the paint layer on top of the stain. C. The only problem is that plywood's rate of expansion and contraction far outstrips that of ceramic tile, which makes plywood a difficult bonding surface. 11 – Interior Installation of Cementitious Backer Units . 5. Tile should never be installed directly onto plywood. Installing Tile on Exterior Walls. 0162 nominal Lead-coated copperd 0. Plywood must be installed over an adequate subfloor and must be at least 1 1/8 ″ thick when combined with the subfloor. Refer to B421 and B422 for bonded Board and Waterproofing. eXP Sheathing. If you have 1/2" plywood, you should add at least 1/2" cement or rock board over it. Stagger panel joints from plywood base joints. In order to install tile directly over the exterior The subfloor should be made of. Another TCNA method (F147) uses a min. It does not belong as a floor or a roof; minimum 5/8" exterior grade. around the perimeter and in Tiling on plywood Hi I'm hoping I can get some straight answers from you guys, as the more tiles shops I go on the more different answers I'm getting! I decided to help my dad redo his bathroom, I've done 4 years of plumbing the that wasn't an issue. Hi! We are wanting to tile over a concrete pad (26 years old) and have stained and then painted over the years. How the floor is prepared for the installation, however, is another For residential use, one form of underlayment the Tile Council of North America’s handbook allows is plywood over joists that are 16 in. ) must be suitable for exterior applications over decks constructed from plywood. This means you can have a 3/4 inch wood subfloor covered by 1/2 inch plywood, cement board, or approved gypsum fiber underlayment. it can serve as a subfloor for a new layer of tile to be installed on top of it. For proper technical installation instructions, reference the Brick Industry Association Tech Note 28C. Plywood and OSB are not suitable surfaces for installing tile on walls and foam does not have the tensile strength to support tile. CDX plywood, a stock item at most lumberyards, is a utility grade suitable for most outdoor While a 2-inch mortar bed remains my first choice as a setting bed in wood-frame construction, the next best option is a double-plywood substrate. The combination of tile, grout, wood and water in an environment with temperature and moisture fluctuations makes it nearly impossible to get the long-term performance that most occupants expect. Wanting to put porcelain tiles over it and live in midwest , so there are cold winters. When prepping your installation site, make sure the that surface is: clean; dry; level Install minimum 3/4 exterior-grade plywood or OSB base across the wood cabinet sup-ports. 5 | Exterior application (Limited to HardieBacker 500 in HZ10 climate zones) ‡ Additional details on page 4 Follow Countertop installation steps 1 thru 4 Dec 04, 2015 · The TCNA spec shows this detail with the tile bonded directly to the plywood, but few tile experts recommend doing this. 12 – Installation of Ceramic Tile with EGP (Exterior Glue Plywood) Latex-Portland Cement Mortar . But in more demending wet/dry/freeze/thaw installation, most recommend cement board as a transition between the plywood and the membrane due to differential movement of the wood versus tile, and possible shearing action that could occur at the bonding layer of the tile. The secret for keeping your tiles and grout from not cracking is a good sub-floor installation. WonderBoard Lite cement backerboard or lath and a cement scratch coat must be installed to the wood or foam surface before the installation of tile with an appropriate mortar. Because plywood expands and contracts beneath the ceramic tile, grout and tile failure (loose tiles Whether you’re installing over an existing floor made from linoleum, hardwood, or concrete, or on top of a plywood subfloor, you need to inspect the surface to ensure it’s ready for installation. The temperatures range from low 30's to When the installation area is large, grout and clean one section at a time rather than applying grout over the entire tile area. Sometime shortly thereafter, I can only assume they decided that they wanted to improve drainage for any rainwater that blew into the space through that screen, so they Exterior plywood contracts and expands, which makes it hard to bond with other materials. We show you how to apply RedGard elastomeric 31 Oct 2016 Laying tile over a plywood subfloor can be tricky, but if you prepare the sub floor properly, your tile floor will last for a lifetime. on a slab floor or patio) , you must mix mortar, set tile, apply grout, and seal the tile. FASTEN Space fasteners 8" o. Most popular exterior application. However, it is not a preferred method of installation and you should always use a recommended substrate and underlayment combination for the best results with your tile. 3-1/2" mineral wool 8 Apr 2020 Install a layer of exterior-rated sheathing over the 5/4 planking, either 3⁄4-in. Nov 11, 2019 · How to Lay a Porcelain Tile Exterior Patio. Exterior Wet areas such as bathrooms and washrooms, as well as exterior settings, need to use exterior-grade plywood. Interior-grade plywood and particleboard are not considered strong enough for a tile installation. (Gap between sheeting as Plywood vs Cement Backerboard Underlayment Whether it’s made of stone, ceramic, porcelain, or glass tile enhances many different settings with its beauty and durability. In order to install tile directly over the exterior plywood, you will need to use a special bonding agent in order for it to hold up. tileusa. Tiling Over Plywood Subfloors - JLC Online Exterior Grade Plywood, Plywood Subfloor, Carpentry, How to Install Tile Backer Board on a Wood Subfloor. Questions and concerns regarding design and construction should be directed to a knowledgeable professional. 25 High-yield copperd 0. Even if you use a waterproof underlayment membrane, the floor will still be either 1/4″ or 1/2” higher than the subfloor, plus the thickness of the tile and adhesive. Today, builders can choose from several types of exterior plywood. There are five important ratings that convey where and how to use plywood: Exterior, Exposure 1, Exposure 2, Interior and Structural 1. Start by measuring the room. 18 Jul 2017 In this video we show you how to install tile an exterior porch over a plywood substrate. Wood: Exterior or exposure 1 plywood, APA-rated sheathing, Sturd-I-Floor, hardwood, tongue and groove and OSB with standard face. Concrete is the preferred choice for an exterior setting, but either works. com), and local building codes. Get the dimensions of the room and then multiply them to get the square EXTERIOR APPLICATIONS 13 Exterior Concrete Floors, Patios, and Walkways Concrete or Wood Substrate - Balcony and Terrace Schluter®-Systems’ written installation instructions shall have precedence over referenced industry standard guidelines and installation procedures insofar as referenced information may contain overlapping or DryPly® plywood Sturd-I-Floor® panels feature a water-repellent coating that provides excellent weather protection during construction. " Prior to setting the tile, ill all joints with the same mortar used to set the tiles. Accordingly, the installation must be suitably rigorous. To minimize cracking and popped tiles, the TCNA always recommends the use of an uncoupling/waterproofing membrane over exterior plywood substrates. Exterior Grade or Exposure 1 Plywood exhibiting the American. April, 2002. Nov 28, 2017 · Exterior plywood came on the scene in 1934 with the development of a waterproof adhesive. Is this a problem? Or does it have to be completely free of paint before tiling. Plywood must be installed over an adequate subfloor and must be at least 1 1/8″ thick when combined with the subfloor. In fact, the coating on this tried and tested sub-floor helps reduce water absorption by up to 40%. plywood underlayment over a 3/4 in. Can you lay tile over linoleum or vinyl? Plaza and Deck provides a thin, lightweight, weather and frost resistant installation for ceramic tile, pavers, brick or stone. It includes substrate preparation—such as addressing concerns like laitance, substrate variation, excessive porosity, and waterproofing—as well as product selection and installation tips to make sure exterior installations withstand the elements. INTERIOR FLOORS OVER WOOD F250-16 Underlayment—minimum 15/32" exterior glue plywood allow for thin-bed tile installation. Without such, water will be able to penetrate below the tile layer and could cause A number of different types of substrate are used for tile, including plywood. There are tile-on membranes that can go right over the plywood. Step 1 - Measure. 3. c. Jan 19, 2017 · At the time of the project four years ago, Schluter also offered a less-expensive detail for building over unoccupied spaces (called D-EXT-W-13), which merely called for the installation of cement backerboard over the plywood, with the Schluter-Ditra membrane installed on top of the backerboard. ANSI A108. 3/8 in. If new ceramic tile is being laid on an existing floor, the cement board can usually be laid right over the existing floor finish, provided it is in good shape and the extra floor thickness is not a problem. One question that folks new to ceramic tile frequently ask is whether they can lay the ceramic directly on top of a plywood or OSB subfloor, using a thinset cement or liquid nails to glue down the tile to the wood. Panel Attachment – For Ceramic Tile 1 Lamination: Laminate F IBEROCK Brand Underlayment to minimum 16 mm (5/8 ) thick exterior grade plywood using Type 1 organic adhesive,latex portland cement mortar,or dry If you’re working over a wood subfloor, cement board is the right choice for your tile base. 49/Tile Outdoor Interlocking Patio Tile Flooring Installing tile over a standard deck frame in an exterior environment could result in issues down the road. Remove excess grout from the tile surface by moving the rubber float at a 90-degree angle across the tile in a diagonal direction. Ensure that the ply is suitably fixed first to minimise any movement, then use a latex based primer and a cement . No matter what you’re told at a home center, it’s not a good idea to install tile directly over plywood, especially in a damp area like a bathroom. The following information is to show the proper methods and materials for installation of tile, stone and other direct adhered materials onto exterior glue plywood (wood) substrates/framing for interior floor applications. O. While I prefer using 1/2” cement backer board over a plywood subfloor, you may be able to get by with 1/4” backer board instead. But a number of precautions must be taken to ensure a successful installation: How to Tile an Exterior Deck. There is also existing cement stucco Ceramic tile is the most durable flooring you can install. Mar 05, 2010 · A poor ceramic installation will delaminate from the subfloor, split at the grout lines, or worse–crack directly across the tile. The system is simple: using a small number of product components,TROBA-LEVEL™ paver supports compensate for sloped substrates, level the corners of adjacent tile pavers, and allow for the flush installation of tile pavers with different thicknesses. This process is not complicated, but you will need to be willing to do some work. CDX plywood or 3⁄4-in. Then your ready for your tile installation. Most tiles are approved for installation over solid plywood floors, but before you can spread the thinset and lay the tiles, you have to prepare While the specifics involved in the exterior tile substrate and assembly details can be looked at in more detail, there are a couple of installation considerations to keep in mind for an outdoor tile project that requires the expertise of 2 to 4 sub-trades. 1A - Installation of Ceramic Tile in the Wet-Set Method with Portland Cement Mortar. The span rating provides a measure of the strength and stiffness in the direction parallel to the grain of the face and back veneers of the panel. 1/4-inch Position the screws at least 1/2 inch around the perimeter but no more than 2 inches from the edge. Use the Extreme Deck Waterproofing System over: Concrete: Poured, pre-stressed and pre-cast concrete, concrete backerboard, mud beds, gypsum, lightweight concrete and patching compounds. reduce the height your installation by using plywood alternatives (Ex. Find out what to do (and not do) when installing ceramic tile over existing tile, concrete, wood, or vinyl floors. Once again, even though adhesive products are available for setting tile over exterior grade plywood, this may mean the difference between a 3-5 year installation and a lifetime installation. Incidentally, exterior stone or tile should never be installed directly over PT plywood, which expands and contracts as it gets wet and dries out. 13 – Installation of Load-Bearing, Bonded, Waterproof Membranes for Thin-Set Ceramic Tile and Dimension Stone continued Specifications for the Installation of Ceramic Tile 24 hours after floor covering installation before placing heavy appliances or furniture on floor. Tile and setting materials (e. INSTALLATION OF CERAMIC TILE OVER PLYWOOD SUBSTRATES WITH LATEX-PORTLAND CEMENT MORTAR TB22 All wooden flooring, when placed over conventional floor joist or other systems, should be of a design and thickness so as to maintain a substrate deflection not to exceed 1/360th of span, including live and dead loads. There’s no better way to protect your sub-floor, reduce time-consuming sanding and minimize callbacks. Generally, ceramic, porcelain, or stone tile can be installed over suitable substrates in exterior locations, including mortar beds over concrete . While you can lay tile directly over a concrete slab using thin-set adhesive, don't While I prefer using 1/2” cement backer board over a plywood subfloor, you may be able to get by with 1/4” backer board instead. HardieBacker : What subfloor should HardieBacker board be installed over? For a Hardwood transition, you want the type that abuts the tile, like this 12 Dec 2011 “I'm wondering if you can lay tile over a concrete subfloor without compromising the thermal mass capacity of the concrete,” she writes in a Q&A 18 Feb 2011 Never use PVA over plywood. Overview: Preparing your Subfloor for Tile In this video, learn how to prepare a wood or concrete subfloor for tile, including such steps as checking for dips, installing backerboard, applying primer and thinset, pouring liquid underlayment and when to use OSB or exterior-grade plywood. 1/2" plywood is for temporary applications, exterior sheathing and used as gigantic shims. Background: A note in the Tile Council of North America's (TCNA) Handbook for Ceramic Tile Installation lists several “details” with the following note: “These For decks built over occupied living space, there's a Kerdi specification (called D- EXT-OS-13) that requires a roofing membrane installed on a plywood deck, Using level to install tile on floor. Resilient flooring products, whether sheet, plank, or tile, function as moisture Vinyl flooring is usually not installed directly over the subfloor in residential applications. on the subfloor, on the underlayment, on the back of the flooring, and sometimes even during the removal or installation of resilient flooring, all flooring work should stop until DuraCeramic Premixed Grout – For joints on grouted floor tiles. A licensed architect or structural engineer should evaluate the exterior deck before the installation of Noble Deck and tile. To install bathroom tile over plywood, you'll have to follow a series of steps. How to Install Tile Floors Outdoors - An Overview Tutorial In this section, we provide you with an overview of how ceramic, porcelain, or stone tile can be used in exterior patios, walkways, porches. felt or 4-mil polyethylene and attach with 1/4" galvanized staple. Learn about the considerations for installing deck tiles 26 Sep 2019 If you're planning a tile installation project, don't forget underlayment so as well as to protect from moisture from coming through the subfloor DRIcore® Subfloor has a patented moisture barrier that protects finished flooring from foundation cracks, window leaks, exterior drainage or hydrostatic pressure issues, If you install DRIcore panels over a drain access, cut an access opening in the Ceramic Tile - Fasten each DRIcore panel with five, flat head and Learn how to install tile over preexisting tile and tips to help you through the process. 21 Jan 2020 Composite deck tiles do; Installation: Do you want to work outside in the Heat: Plastics retain heat more than traditional wood, and therefore 28 Mar 2013 The difficulty is that tile can be installed over a number of substrates, and each requires specific preparations to ensure a long-lasting tile floor. To 25 Oct 2014 It does not belong as a floor or a roof; minimum 5/8" exterior grade. Use SubSeal® Liquid Waterproofing Membrane membrane over: Concrete: Poured, pre-stressed and pre-cast concrete, concrete backerboard, mud beds, gypsum, lightweight concrete and patching compounds. It forms a smooth, monolithic, watertight surface over walls, floors and ceilings. HardieBacker: What subfloor should HardieBacker board be installed over? The minimum subfloor specified is 5/8" exterior grade plywood or 23/32'' exterior grade OSB subflooring Cement board installation on floors: 5 mistakes. , BB’s, thin-set, etc. Applying metal lath and a mortar scratch coat over plywood and building wrap sheathing. Methods developed for interior installations are not necessarily appropriate for exterior installations. 1B - Installation of Ceramic Tile on The following information is to show the proper methods and materials for installation of tile, stone and other direct adhered materials onto exterior glue plywood (wood) substrates/framing for interior floor applications. Author's Notes:. They will be attached to plywood. Plywood Association (APA) PS 1-95 stamp in accordance. Unfortunately, there many ways that a tile installation can fail from the wrong setting materials to inadequate back-buttering of large format tiles. 375 Hardboard sidingc 0. 5 Glass-fiber reinforced concrete panels 0. )(3) Application(1) Thickness (in. The flat clay figures have been kiln fired. Exterior means the panels have been waterproofed and can withstand inclement Tiledek™ Waterproof Underlayment Membrane is the ideal solution for reliable waterproof performance in exterior tile deck or tile roof deck assemblies. 6 Fiber cement lap siding 0. Which Adhesive & Grout To Use With Outdoor Tiles Dean Quinn June 22, 2018 0 Comments Selecting the correct adhesive and grout products is essential for a successful outdoor tile installation but for the uninitiated, choosing the right products for your project can be a minefield. This will strengthen the floor Sleeper-constructed subfloor — Consists of wood subfloor installed over or on 3) Lauan Plywood, when used as an underlayment, should be Type 1 (Exterior). The school is on the CA Central Coast. Position ends and edges over supports. subfloor with a crack-isolation membrane under the tile. Install with screw that are made for this type of installation. Tile set on prepared Exterior or Exposure 1 plywood with EGP (Exterior Glue Plywood) latex-portland cement mortar certified by the manufacturer as suitable for intended use. Installing tile over a standard deck frame in an exterior environment is a recipe for trouble. Plywood Or Other Structural Ceramic tile installed over PermaBase. Cement board, thinset and tile add up to about 5/8 inch. ed for installation in exterior or unheated areas, wet areas, like shower walls or 11 Oct 2018 A detailed overview of installing wood look tile floors plus lots of tips He been working in the business for over 30 years – first at a local We used 1/2″ plywood for our subfloor and installed it using our nail compressor. Tiledek is the 3rd or 4th step in the outdoor tile assembly. Proper installation of the cement-based backerboard using water-resistant mortar/thin-set will help prevent this, as well as proper tile installation. It should also be noted that exterior installations of tile require movement Oct 26, 2015 · Nevertheless, plywood is still a wood product and is subject to the effects of excessive moisture in the long run. 313 Exterior plywood (without sheathing) See Section 2304. Tile backer boards like Hardibacker Board, Wonderboard, Permabase, and Durock cement backer board installs. 3 – Note v: Minimum nail length must accommodate sheathing and penetrate framing a minimum 1 ½ inches. Embed 2 in wide high-strength alkali-resistant glass iber tape in the mortar and level. Tile installed over wood floor systems MUST have a minimum of 1-1/4 inches of solid material beneath it. ) & Type Panel Edges(2) Intermediate Over smooth 1/4 3 6 each way subfloor Over lumber subfloor or other 11/32 6 8 each way uneven surfaces 4 FIGURE 1 INSTALLATION OF APA PLYWOOD UNDERLAYMENT Resilient tile or sheet flooring, carpet or nonstructural flooring Apr 24, 2013 · Often, the tile will crack due to improper support. Fasten to the plywood with 1-1/4 DUROCK Brand Wood Screws or 1-1/2 hot-dipped galvanized roofing nails,spaced Cladding Attachment Over Thick Exterior Rigid Insulation Background Current Building Code does provide prescriptive means to attach cladding over exterior insulation Table R704. over conventional framing and in accordance with HardieBacker board printed installation instructions, TCNA guidelines (Tile Council of North America Handbook, www. WATCH SCRATCH AND LATH THICK SET METHOD VIDEO. Apr 17, 2009 · Yes you could but you will have problems later down the road. Minimum Plywood Fastener Size Fastener Spacing (in. Sequencing of the assembly. Learn more: 30 Apr 2015 Installing ceramic tile or stone on exterior balconies, patios, walkways including a coved reglet embedded into the wall above the tile, mortar 7 Jan 2020 While most floor tile these days is installed onto a layer of cement board or similar backerboard, it is possible to lay tile directly over plywood. You will need to purchase a polymer mortar that meets required standards. The HD on-line project instructions say that when installing porcelain tile, that it should be over exterior grade plywood, but that "Oriented strand board, or OSB, and exterior-grade plywood will work if first covered with a latex-modified mortar and a tiling backerboard. 2. While most floor tile these days is installed onto a layer of cement board or similar backerboard, it is possible to lay tile directly over plywood. Installing almost any type of tile is the same whether it's designed for the interior or exterior. POSITION Fit ends and edges of panels closely but not forced together. Do Not Install over Plywood for Exterior Use - Call I Install Tile over Plywood for Exterior Use - I am looking for an adhesive for an outdoor red clay mural we are making at our school. Here are the basics of how to install bathroom tile on plywood. When thinking about using porcelain tiles outdoors there are a number of important considerations to take into account. DUROCK Brand Cement Board offers architects, builders and tile con- tractors a strong 19 mm (3/4) exterior grade plywood base across wood double-layer walls where cement board is installed over base-layer gypsum boards, apply a 14 Apr 2016 Three-quarter inch exterior-grade plywood will be fixed to the balcony's 4/ Installing the Schluter Ditra Drain drainage mat side down above the roofing membrane with non-modified tile adhesive, using a ¼ x ¼ trowel. Figure A represents tile installed over a mortar bed fastened to masonry or concrete while Figure B is tile bonded directly over masonry or concrete. The subfloor should be made of Oct 06, 2015 · A plywood underlayment (I’m not sure it was exterior grade or pressure treated) was installed over the 1×6 pressure treated decking, and the tile installed on top of that. felt or 4-mil polyethylene film using 1/4 galvanized sta-ples over the plywood base. Ratings . exterior tile installation over plywood