wonderboard over osb
On the good side, Wonderboard is cheaper than HardieBacker, so will be more cost-effective with large installations. Osb is perhaps 50 strands thick, so its characteristics are averaged out over many more “layers” than plywood. Professional Solutions for Professional Results These areas also require proper waterproofing. Hardibacker is the best known fiber cement board. Floor joists framing should be spaced a maximum of 16" (40.6 cm) o.c. n 1/2" WonderBoard should not be used as a ... alkali-resistant mesh tape and smooth material over joints and corners. • Joist spacing not to exceed 24 in on center. When WonderBoard® Lite Backerboard is used as a part of a qualifying full installation system of CUSTOM products, the installation can qualify for up to a lifetime system warranty. WonderBoard is a brand of fiber cement backer board that you install prior to installing tiles on the floor or walls. Wonderboard hygienic … Depend on the floor you plan on laying. We've ripped out the plank sub-floor in my kitchen (they were really uneven and rotting) and want to replace with 23/32" OSB plywood. Precision demands the best. 3/4" Thick Solid Wood Flooring can be installed directly over 3/4" thick OSB subfloor. For wall framing, edges parallel to framing should be continuously supported (typical sleeper studs should be used). Instead, you need to use approved levelers. When using 7/16" WonderBoard Lite, base should be a minimum of 5/8" thick. OSB (oriented strand board) is made from large, flat chips arranged in as many as 50 layers, which are adhered together with glues and pressed into sheets. Start installing your boards a quarter inch above the floor, tub, or shower board and caulk accordingly. It would guarantee the creation of hollow spots between the beads because it is not fluid enough to flow completely under and uniformly support the backer board. BY LEE WALLENDER 4. Exterior grade plywood or OSB subfloors or counters should be a minimum of ¾ of an inch thick. Wonderboard: For the subfloor, securely glue and fasten minimum 5/8" (16 mm) exterior grade plywood or OSB panels (PRP-108) to the floor joists. WonderBoard is a cement-based backer board mainly used for tiling in wet places. One of the most readily available are cement backerboards. 2. Pin Share Email Michael Holley/Wikimedia/Public Domain. Using a 1/4" (6 mm) square-notch trowel, apply a setting bed of polymer-modified mortar to the subfloor. qԒN���oˠc��e��?� 3�� �Bp�`VɏLO�4�!97��Qh�u����q?3>��B�ѐf�'{K'���Y�����q2^N;5Y�'�:��h�r5���)�?��xk��|sw{��ـp�%N�\,?�n�/ֿlw�.�n�8��GB9ϫ?�ӹ.��-����/��lJc*4���Y{1��?�s�г%hDΎe�D8W@�V. High-flexural strength, along with moisture resistance, makes WonderBoard® Lite ideal for both interior and exterior substrate applications. Protect your surface against both oil-based and water-based stains with the right sealer. The panels meet all the legal requirements of the Food Safety Authority. OSB boards can be somewhat smaller for the same strength. I've read a lot of conflicting articles whether to use OSB or not under cement board (and then tiling over it). Apparently the refrigerator had small leaks over the years but the compressor heat evaporated the water while causing minor mold therefore we did not have any extensive smell of the mold. I've read a lot of conflicting articles whether to use OSB or not under cement board (and then tiling over it). This video is about Installing cement board subfloor to get ready and install a porcelain 6x24" plank that resembles a natural wood floor. 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. Fasten cement board with specified nails or screws, a … Allow one day … Install WonderBoard® Lite, leaving a 1/8"-3/16" (3-5 mm) space at all joints and corners. Floor joists should be spaced a maximum of 16" (40 cm) o.c. OSB (Oriented Strand Board) Subflooring. When setting dimensional stone larger than 12" x 12" (30 x 30 cm), a 3/4" (19 mm) non-deflecting subfloor is required. Turn the cement backer board over so that the former top is now facing down. For the subfloor, securely glue and fasten minimum 5/8" (16 mm) exterior grade plywood or OSB panels (PRP-108) to the floor joists. Work outdoors, in a well-ventilated area, or use mechanical ventilation. Remains stable when exposed to moisture, reducing risk of moisture damage. It’s used to simplify the process for preparing your subfloor. There's a dip about 3/8" deep by 2 feet wide by 5 feet long. 36" x 60" x 1/4" (914 x 1524 x 6 mm) for floors and countertops. The underlayment for ceramic tiles, is the final layer that lies directly beneath the surface flooring. 3. Whatever the application, CUSTOM® offers the broadest line of tile and stone setting materials in the industry to give the exact performance your job demands. Based on carpet/pad over oriented strand board in place of ceramic tile and cement board 60 RAL-TL-89-141 62 RAL-IN-89-8 EXTERIOR WALLS Two-Hour Fire-Rated Construction Steel Framed, Non-Load-Bearing Acoustical Performance Construction Detail Description Test Number STC ITC Test Number 55⁄ 8" • 1/2" USG Durock® Brand cement board Tile requires a structurally-sound, sturdy foundation, and plywood alone is unsuitable. They also have a proprietary 1/2" wonderboard over 3/4" t-g exterior plywood subfloor where joists are 24" oc. Turn the board carefully to avoid accidentally breaking it along the score line and ripping out mesh from the board. Backerboard edges parallel to the framing should be continuously supported. Installation usually consists of gluing and nailing the OSB sheets to the floor joists. To cut, score through the panel on one side and snap it off. Manufactured under the authority of Custom Building Products, Inc. © 2017 Quikrete International, Inc. Do not use drywall fiberglass tape for this product. The joists are labeled (don't know what you need, so I'll rattle off everything I saw on them): TJI 230 ICC ESR 1153 CCMC 13132 - R HUD 689 GG. Updated 01/07/20. I have 3/4" OSB subfloor throughout my whole house. OSB Subflooring looks like, and is, a bunch of wood chips glued together. We've ripped out the plank sub-floor in my kitchen (they were really uneven and rotting) and want to replace with 23/32" OSB plywood. Do not use wallboard joint compound for this product. Now 8,000 x $500 = $4,000,000. This product contains one or more chemicals known to the State of California to cause cancer. Wonderboard is pretty expensive, It is a good base for ceramic tile and an provides better stability for it. Specifically, its components are Portland cement, expanded polystyrene (EPS) beads, aggregates, and fiberglass reinforcement. specified nails or screws (as listed in “Materials Required") every 8 in over the entire surface. The plywood adds stiffness and stability to the floor. If it gets wet, it swells up like a sponge. 1) The backer board must go over a subfloor base, and the although the 2" x 6" tongue and groove along with the backerboard might be sufficient and structurally sound enough for the addition of tile, I would add a layer of plywood. Over that, I placed 3/4 particleboard.... yeah, I meant to buy plywood, but the store was out of stock and didn't realize this was a significant mistake. Make the Second Cut . Cement board units (CBU's) do not add significant stiffness. With the plywood in place, install the backer board as you normally would. Plywood subpanels should be gapped … As with any porous surface, liquids can be soaked up and leave some areas unprotected unless several layers are laid down. Obtain the applicable LIMITED PRODUCT WARRANTY at www.custombuildingproducts.com/product-warranty or send a written request to Custom Building Products, Inc., Five Concourse Parkway, Atlanta, GA 30328, USA. throughout the board field and around all edges. Often, there are sanitary walls placed, such as tile walls. ; a 3/4" (19 mm) Exterior Grade Plywood or OSB subfloor with I-joists spaced a maximum of 19.2" (48 cm) o.c. A sustainable solution for an excellent price. Expand Signature. Over Wood Subfloor For best results, be sure plywood subfloor panels are gapped 1/8" at seams. along studs. Then we want to put on hardiebacker board and then tile. Installation must comply with the requirements of all applicable local, state and federal code jurisdictions. Joists’ spacing not to exceed a … We have a ridge vent that runs the length of the roof and have installed soffit vents every two feet for more air circulation. Offering the largest selection of Sealers, Cleaners, Problem Solvers, Grout Colorant and Stone Restoration products, we provide professionals with the right tools and solutions; making us the #1 Contractor Preferred Manufacturer of Sealers and Cleaners. A circular saw can also be used if you are making a number of cuts or cutouts. Custom does allow the application of wonderboard over an osb subfloor. For installation of tile, natural stone or a similar material, comply with ANSI A108 standard specifications. Allow one day for the thinset to dry. Fold the smaller of the two sides up about 90 degrees. This in turn leads to issues like loose or missing grout, and cracked tiles. Everything I've read about cement board (including manufacturer instructions) says to use thinset over wood subfloor, then place cement board, then screw down. If the area behind the backerboard must be kept dry, use RedGard® Waterproofing and Crack Prevention Membrane or Custom® 9240 Waterproofing and Anti-Fracture Membrane. It is not as easy as applying stucco to a brick wall, but if you have the right tools and materials beforehand, it can be a joyful process with aesthetically pleasing results. vapor barrier, 1/2 foam then A/C plywood over that with Tap Con Screws to hold it down. More about our product More about Wonderboard. But, you cannot bond tile to osb because the resins used to make osb … Should you decide to use sealant over backerboard, there are a few points to keep in mind. the inventive building board is characterised in that it consists in a plurality of OSB boards which are … Ceiling panels. screws every 6 in. This treatment is unnecessary if there is already cement backing. Terms | ASTM C473 Standard Test Methods for Physical Testing of Gypsum Panel Products, ASTM C627 Standard Test Method for Evaluating Ceramic Floor Tile Installation Systems Using the Robinson-Type Floor Tester, ASTM C947 Standard Test Method for Flexural Properties of Thin-Section Glass-Fiber-Reinforced Concrete (Using Simple Beam With Third-Point Loading), ASTM D1037 Standard Test Methods for Evaluating Properties of Wood-Base Fiber and Particle Panel Materials, ASTM D2394 Standard Methods for Simulated Service Testing of Wood and Wood-Base Finish Flooring, ASTM E84 Standard Test Method for Surface Burning Characteristics of Building Materials. Wear safety glasses and a dust mask; in very dusty areas or where airborne dust exceeds PEL, wear a NIOSH/MSHA approved respirator. WonderBoard Lite meets the performance standards of ANSI A118.9. Liquid sealants must be applied thickly enough over the entire surface to provide complete coverage, which means multiple coats. mywaynow Minister of Fire. 36" x 60" x 7/16" (914 x 1524 x 11 mm) for floors, walls and countertops. Any plywood or OSB in direct contact with a slab is going to rot out. Sitemap, View All CustomTech Flooring Prep Products, www.custombuildingproducts.com/product-warranty, SpeedFinish™ Patching & Finishing Compound, Meets all ANSI standards for cement backerboard. Durock: Subfloor should be minimum 5/8" exterior-grade OSB or plywood. Lee has over two decades of hands-on experience remodeling, fixing, and improving homes, and has been providing home improvement advice for over 12 years. WonderBoard is a popular brand of fiber cement backer board.
DO NOT install tile directly over OSB (that's what the thinset manufacturers are referring to).
It's ok to put a layer of thinset between the OSB and backer board. This product, when cut, drilled or abraded, produces dust containing free silica, which may cause cancer or delayed lung injury (silicosis) if inhaled. 7/16 board aligns to 1/2" (13 mm) drywall without use of shims or spacers on wall studs. Home. HardieBacker board is not designed for use over concrete. While the setting bed mortar is still workable, fasten WonderBoard® Lite every 4"- 6" (10-15 cm) o.c. %PDF-1.6 %���� Leaving a 1/8" 3/16" (3-5 mm) space at all joints and corners, install the WonderBoard® Lite panels. View Full Version : Susan's project - Need HELP - screwing plywood over OSB. Wonderboard® panels are mainly used in areas subject to very high hygiene requirements (HACCP) and ease of cleaning is required. Tiles are often installed in wet or high humidity areas such as the kitchen, mudroom, and bathroom. CUSTOM will repair and/or replace, at its discretion, the affected area of the system. I am planning to install new ceramic tile in a bedroom converted to a bathroom (12 ft by 10ft). In wet locations, first staple a moisture barrier to the studs. Turn the cement backer board over so that the former top is now facing down. Learn about The Spruce's Editorial Process. All plywood or OSB subfloor sheets must be gapped 1/8" (3 mm). For a proper tile installation you need a proper substrate. WonderBoard® Lite includes a preprinted pattern on the panel surface and is easy to score, snap, cut and fasten, simplifying installation. L'épaisseur du panneau aggloméré à coller doit être la plus proche possible de l'épaisseur du parquet à poser, les panneaux OSB peuvent présenter des dimensions légèrement inférieures pour une même rigidité. My floor joists are 2x8 with 16" centers. Plywood done properly, as Eric describes, will add significant stiffness, which is a good thing. Measure and pre-cut all WonderBoard Lite panels before fastening to the floor, counter or wall studs. Do you have to use mortar to lay wonderboard down? Install according to installation instructions for the corresponding mortar data sheets. The plywood adds stiffness and stability to the floor. Around the perimeter of each board, locate fasteners within 1/2"-1" (1.3-2.5 cm) of the edge. Any shelf, ledge or horizontal surface subjected to water exposure must have a slight downward slope for water runoff. The plywood floor is 3/4" and sits on joists. With this type of floor, however, you do not have the luxury of a quick fix by shimming with shingles. Then we want to put on hardiebacker board and then tile. biter. Cement board is an easily installed DIY tile underlayment providing a stable, dependable tile-setting substrate while eliminating the complicated lath-and-mortar "floating" process. 1 Subfloor and countertop base should be an exterior grade plywood with a minimum thickness of 3/4" when using 1/4" WonderBoard Lite. How to Install a Cement Backer Board Over a Plywood Subfloor in the Bathroom. When you talk about "Subfloor" to me that means T&G OSB, then some type of underlayment before the flooring. WonderBoard® Lite panels are composed of stable Portland cement, EPS beads, aggregates and reinforcement. Provisions for the sheet membrane pan liner must be made to ensure proper backerboard installation at the interface of the tub or pan flange. When you talk about "Subfloor" to me that means T&G OSB, then some type of underlayment before the flooring. Custom Building Products offers you one source for the needs of virtually any job. Plywood has a broader range of variability. For further assistance please contact us at 1 800 282 8786 option 2. Use 1" (2.5 cm) bond-breaker tape over gaps in the subfloor to prevent gaps from filling with thin-set. using 1/4" WonderBoard Lite. Stains can RUIN Stone & Tile.Protect Yours Now! The backer board should be screwed down according to the manufacturers specifications. screws every 6 in. If you're installing tiles or stonework on the floor, on walls or on a countertop, you need an underlayment of concrete board for stability and moisture protection, and WonderBoard fits the bill. Wonderboard is pretty expensive, It is a good base for ceramic tile and an provides better stability for it. WonderBoard® Lite is not a waterproof barrier. h��Z]o��+��>dE?�0�ܶh�45���0 When properly installed on your floor it is … Wonderboard. Over that, I screwed in 1/4 hardibacker, no thinset beneath. Stagger joints so they do not line up with underlying substrate joints. For more information, find details and limitations to this warranty at custombuildingproducts.com. If plywood is not gapped, saw cut joints all the way through the plywood sheets. ... told me that I could just put 1/4" Wonderboard right on top of the vinyl, using modified mortar, then put the tiles down on that. It is for this reason that construction adhesive is even worse than nothing at all. With the plywood in place, install the backer board as you normally would. At all joints and corners, prefill gaps with polymer-modified mortar, then embed 2" (5 cm) alkali-resistant fiberglass mesh tape and smooth material over joint and corner. Our grouts are easy to work with yet deliver hard, dense joints. Applying stucco to a cement board can be a time-consuming process that requires patience. Do not use WonderBoard® Lite for exterior surfaces where imposed wind loads exceed 30 lb/sq ft (146 kg/sq m). Floor joists framing should be spaced a maximum of 16" (40.6 cm) o.c. All Rights Reserved. • Use minimum 5/8 exterior grade plywood or 23/32 OSB with Exposure 1 classification or better, complying with local building codes and ANSI A108.11. The weight applied to the walls and ceiling frame, including insulation, backerboard, bonding material and facing material, should not exceed 15 lb/ft (73 kg/M). Turn the board carefully to avoid accidentally breaking it along the score line and ripping out mesh from the board. The subfloor, which is typically a layer of plywood or oriented strand board (OSB). It's similar to such competing brands as HardieBacker, Durock and Fiberock. 1247 0 obj <>stream Fill all joints and corners, prefill the gap with polymer-modified bonding mortar; then embed 2" (5 cm) mesh tape and smooth material over the joint and corner. When setting dimensional stone larger than 12" x 12" (30 x 30 cm), a 3/4" (19 mm) non-deflecting subfloor is required. His first step was to require all 8,000 subs to up their coverages, both vehicle and liability. Fold the smaller of the two sides up about 90 degrees. Apply polymer-modified thinset to the subfloor, install the backerboard, and screw into place. Moreover, which is better Hardie board or durock? Framing for a tub surround or prefabricated shower pan should be plumb and square. Floors.Both 1/4- and1/2-inch cement board are appropriate for floors.To install cement board on floors, cement board manufacturers mandate a 5/8-inch plywood subfloor or OSB underlayment.They also require a 3/4-inch subfloor where tile size exceeds 12 inches. Depend on the floor you plan on laying. Backer boars are generally placed against plywood or OSB board. A cement board has many varied uses in home construction and is often preferred over greenboards or blueboards in certain areas of the house. Mailing Address Custom Building Products 7711 Center Ave. Ste 500 Huntington Beach, CA 92647, © 2021 Custom Building Products. Provide additional blocking, when necessary, to permit proper backerboard attachment and reduce deflection between the joists. Using a 1/4" (6 mm) square-notch trowel, apply a setting bed of polymer-modified mortar to the subfloor. 2 sheets are better than one if this is for a heavy stove. When this sort of system is used … The foundation of precise tile and stone setting. Product finder. 02-19-2006, 11:07 AM. View Full Version : Susan's project - Need HELP - screwing plywood over OSB. Use of this product may contribute to LEED® certification. 1 1/4" screws should not clear a 23/32's OSB with 7/16" WonderBoard Lite Backer Board over it. Flooring: For ceramic tile floors, the cement board usually rests on a plywood subfloor (minimum 5/8-inch-thick exterior-grade plywood or OSB). ... Particleboard (you sure it isn't OSB?) Our Wonderboard system goes directly on the tile walls. 02-19-2006, 11:07 AM. The first coat fills the grout lines and brings the floor flush with the tops of the tiles, and the second coat bonds … Typically 8" along the edges and 12" in the field. You should rough up the surface of the existing tile with sandpaper to aid adhesion, and it's a good idea to spread two coats of thinset. Fill all joints and corners, prefill the gap with polymer-modified bonding mortar, and then embed 2" (5 cm) mesh tape and smooth the material over the joint and corner. Durock is a reliable cement product that contains glass mesh. Fasten the backerboard every 6" (15 cm) along the joist or rafter. Depend on the floor you plan on laying. Look for tile grout with rock-solid durability, consistency and the largest color palette with Custom. When plywood is used as the substrate, it runs the risk of absorbing moisture over time, which in turn makes the wood swell, then contract when it dries out. One issue with this system is that the edges of Durock are not durable relative to impact. Details: Available in 36″ x 60″ sizes (either 7/16″ or 1/4″ thick), Wonderboard can be cut with a utility knife. is a real no-no under tile. Lightly score … Durock or Wonderboard cement board. American National Standards Institute (ANSI) ANSI A108.11, A118.9, A108.5 and A118.4 American National Standards for the Installation of Ceramic Tile ASTM International (ASTM) ASTM C1325, National Fire Protection Association (NFPA) NFPA 255 Standard Method of Test of Surface Burning Characteristics of Building Materials, Tile Council of North America (TCNA) TCNA Handbook for Ceramic Tile Installation, TCNA Method EJ171. You can lay new tiles over existing ones, provided the existing ones are in good condition with no cracked or loose tiles. Cement backer board is used as a sub-surface for tiling, usually for showers or bathtubs. • The floor must be engineered not to exceed the L/360 deflection criteria (L/720 for natural stone), including live and dead design loads, for the specific joist spacing used. The 24" oc joist with 1/2" wonderboard is the only one requiring plywood as opposed to osb. 3/4" (19 mm) exterior grade plywood or OSB … When using 7/16" WonderBoard Lite, base … Add a layer of 1/2-in. So if you have a condition where the edge is exposed … Search for: tile over osb Published by on December 13, 2020 on December 13, 2020 Use the product guide I'm searching for a specific product for my project. Tile jobs over framed floors often fail due to deflection of the substrate, so this is very important. The floor and subfloor combined should be at least 1-1/8 inches thick for proper support. Add a layer of 1/2-in. Applying stucco to a cement board can be a time-consuming process that requires patience. Turn Over the Board . Screws do not grab very well, tending to pull straight through. Here’s an overview of how it’s used to complete a tiling project. Stagger joints so they do not line up with underlying substrate joints. Custom® Building Products is committed to environmental responsibility in both products produced and in manufacturing practices. Stagger board joints with those of adjacent rows. After flaying it, finish the seams with mortar and tape. All plywood or OSB subfloor sheets must be gapped 1/8" (3 mm). The Hardie specs say "For all floors: Use minimum 5/8" exterior grade plywood or 23/32" exterior grade OSB, complying with local building codes and ANSI A108.11. Durock can be used for both internal and external situations. Make the Second Cut . Precut WonderBoard® Lite panels and make any necessary cutouts. These include products such as Hardiebacker, Durock, Fiberboard, wonderboard and a host of others. That said, greenboards and blueboards are also often and equally used in home construction and are, sometimes, a better alternative. New formula -- same durable performance with faster, easier installation. Cement backer board was developed first to replace the cement mud and metal lath systems installed by real craftsmen. ��u�*V���Ϳ�p�%Z'Zh\�/��r�8�g���\�t�� ��؈h�F#R'��; �]�40�.���B���亨��]�}��Έ������l�L���w]-Ն�w���F�(Ո�U���N��IF�s�S��))F�Q;5�P#�� �5=�w�ц5Sh�h,&Ls�&e�5��Ӝ�u���dF�i.����M�9��������ӧ��>Qtݛ��!���\�������z�����_�/ן;/�7��zԐ���?�����f�|���/.��sg�Ww��?��n��;q�[�m�j�y�`����_�>�7Ƴ|�˾�}ΧE�#�U���b:��Ǟ�>�t�!��טJ>� �Z�,G:�(SO���2U01�s.Lf*2� � Review: I find Wonderboard difficult to work with, as it tends to crumble easily and needs to be treated gingerly. When installing a glue-down floor directly over concrete, flattening can be even more important. Lee Wallender. Use the product finder for productinformation. Immediately laminate the WonderBoard® Lite to the subfloor, leaving a 1/8" - 3/16" (3-5 mm) space between the boards at all joints and corners. I definitely recommend cement backer board (Durock, Wonderboard) over fiber cement tile backer (Hardie)--the latter is "stiff" enough that a point load will "curl" up the other part of the board. Privacy, Contact | SuperiorBilt® Tools are professionally preferred for tile, stone and floor covering installations. CustomTech – the industry’s leading collection of technologically-superior, easy-to-use, professional grade subfloor preparation products designed for all types of floor coverings. Over the last 10 or so years I have noticed mildew growing in the corners of the outside walls of the bedrooms, where the walls meet the ceiling but mostly on the ceiling. You can cut and fasten WonderBoard as you do drywall. Do-it-yourselfers can use either 1/2- or 1/4-inch cement board in certain applications while other scenarios mandate 1/2-inch board. 3 Joists or framing should be spaced no more than 16" on center. Framing members in the walls and ceiling should not exceed 16" (40 cm) o.c. Stagger board joints with those of adjacent rows. They allow it over 5/8 osb at 16 oc joists and 19.2" oc engineered joist systems with 3/4" osb. The question is did he save any money? 2 Ensure the subfloor is structurally sound and clear of debris. Place the tip of the blade in the "V" section created by the fold. Quality begins from the ground up. Apply polymer-modified thinset to the subfloor, install the backerboard, and screw into place. Step 3 of preparing your wood subfloor for tile is installing cement-based backerboard. Floors Subfloor Requirements:5/8" (16 mm) exterior grade plywood or OSB panels (PRP-108) should be securely glued and fastened to floor joists. Over the next year each sub raised their prices by $500 to compensate for their increased insurance. Careers | My plan was to fill it with self-leveling compound, before installing the cement backerboard and then the tiles. Re: 1/4" Hardibacker over particleboard subfloor I wondered about that. Cement board has improved over the years and is easier to work with. I'd like to install slate tiles over a pre-existing plywood floor. Use 1" (2.5 cm) bond-breaker tape over gaps in the subfloor to prevent gaps from filling with thin-set. A 20% lighter fiberglass mesh-reinforced cement backerboard for residential and commercial tile, stone, slate and thin-brick applications. To avoid building up the floor too high, you can use 1/4-in.-thick backer board instead of 1/2-in. When I removed the old tiles and gypsum, OSB board revealed random spots of dried mold especially under the refrigerator. Nail or staple 15 lb roofing felt or 4 mil polyethylene sheeting to the studs. Products : Surface Prep : Cement Backerboards : WonderBoard® Lite Backerboard. What I have done and it worked out great is used a 6 mil. backer. The total wood subfloor including the plywood and WonderBoard Lite should be a minimum of 1" thick. My floor joists are 2x8 with 16" centers. The "floppy" Durock conforms to uneven surfaces. PE Alderlea T6, Jotul F602 The most important tool in the wood burning process and the largest variable is the one that is running the stove.
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