Limestone

----- Read this guide, IN FULL, prior to beginning any installation of limestone -----

To ensure proper installation based on unique project and/or site conditions, clients are responsible for hiring a skilled installer that has experience in installing and sealing limestone. Zia Tile is not responsible for installation, ongoing care, or issues arising after receipt and installation of product. If client’s installer deviates from the instructions or recommendations below, this may result in costly and undesirable outcomes.

REVIEWING YOUR ORDER

• Please inspect your order thoroughly, upon receipt. Zia Tile cannot be held responsible for the stone that have already been installed.
• Limestone is a natural stone; therefore, significant variations in color, and subtle variations in shape and size are natural and should be expected in your stone pieces.
• To account for cuts, pattern, inherent variation, and potential breakage in transit, it is strongly recommended that all orders include a minimum of 15% overage to avoid costly add-on shipping and schedule delays.

BEFORE BEGINNING YOUR INSTALLATION

• As a result of the production process and shipping, your stone will likely contain a dust residue. Prior to beginning your installation, lay out all stone pieces and use a heavy spray to remove this residue. Allow all pieces to dry thoroughly before installing.
• Due to the inherent color variation of natural stone, it is very important to blend the pieces from all boxes in your order. You should then lay out all individual stones in the installation area and ensure any variation is distributed evenly before beginning your installation.
• There is a face and an underside to limestone, they are not reversible. Prior to installation, ensure you are installing the stone face side up. You may see cut marks or lines from the finishing process which could be present on the underside of the stone.
• Grout color is an important design decision - almost as important as the stone color itself. We recommend exploring Mapei Flexcolor CQ grouts and either selecting a lighter neutral color or matching the grout color as closely as possible to the color of the stone. Visit our website or Instagram to view installation examples to decide what grout color is preferred.

INSTALLATION

REQUIRED MATERIAL

For placing the limestone:

• Sponge
• Bucket
• 1/8” tile spacers
• High quality medium-bed thin set mortar
• Trowel
• Mapei Flexcolor CQ grout
• Grout float
• Grout bag (if using a contrasting color grout)
• Water-cooled tile saw with diamond edge blade

For cleaning and sealing limestone:

• pH neutral cleaner such as Miracle Sealants Heavy Duty Cleaner (Acid Substitute)
• Paint roller, paint tray, sponge and water bucket
• Lint-free cotton cloth
• Penetrating Sealer - 511 Porous Plus Sealer from Miracle Sealants
• For interior applications - Fila Matte Protective Wax

LAYING LIMESTONE

• If cuts are required for your installation, all saw cuts must be made with a water-cooled tile saw

FOR FLOOR INSTALLATIONS

• If the subfloor is even and in good condition, a high quality medium-bed thin set is sufficient to set the stone pieces. Please make sure the subfloor has completely cured (usually a minimum of 30 days) to prevent efflorescence spots from depositing on the surface of the stone as moisture evaporates through them. Uncured or unsettled sub-surfaces can cause cracks to form in the stone as the sub-surface deforms, so always ensure the sub-surface has cured properly before installing limestone. Use of an uncoupling membrane (such as DITRA) may also be advised.

FOR WALL INSTALLATIONS

• Only install limestone on stable, even surfaces. In dry areas (i.e. kitchen backsplash), limestone may be installed directly to drywall. Never apply the stone directly to a painted surface.

FOR COMMERCIAL AND/OR WET AREAS

• If installing on a flooring surface in a wet or commercial area, slip resistance can be increased by increasing grout joint size and/or applying an anti-slip product after installation is complete. Always consult with your licensed installer on slip specific questions prior to installation and note that honed limestone has a DCOF rating of 0.50 and bush hammer limestone has a DCOF rating of 0.56. See product spec sheet for additional information.
• Evenly apply the thin set mixture to the install surface using a trowel. Wet the back of each stone with a sponge before applying the adhesive to the back of each piece of limestone, making sure to apply the mixture in the same direction in order to prevent air pockets from forming.
• Lay limestone in accordance with the drying time required for the thin set used. Press the stones into place. Using a rubber mallet, compact the limestone pieces evenly on the adhesive to ensure consistent contact.
• Ensure the limestone pieces are perfectly flat during installation.
• Place in small sections, no larger than 2’x2’, at a time, using 1/8” tile spacers to separate the stones.
• Immediately wipe off any residual thin set from the surface of the limestone. Thin set can be incredibly difficult to remove without damaging the stone if left too long.
• After the stones have been laid, allow the thin set at least 48 hours to cure before sealing and grouting.

PRE-GROUT SEALING

• Limestone must be sealed on-site. Use a pH neutral cleaner before sealing; products made to clean natural stone are usually suitable. Use of acidic cleaners will damage the limestone and should be avoided.
• After your thin set has cured, your limestone has been cleaned and prior to grouting, apply 511 Porous Plus sealer in thin layers until the stones become fully saturated, wiping off any excess sealer before it dries. Do not over-seal as thick or excessive application of sealant can dry unevenly and result in an undesirable waxy film on the surface of the stone. Allow sealer to cure, typically 1-2 days; always follow the sealant manufacturer’s application instructions.
• Do not proceed to grouting unless your sealer is fully cured!

GROUTING

• Using MAPEI FLEXCOLOR CQ GROUT, fill in the gaps between the stones with a rubber grout float. Grout in small areas, no larger than 2’x2’, at a time. DO NOT grout the entire surface at once, as limestone can stain from excess grout that is extremely difficult to remove later. Instead, grout small areas and immediately wipe away the excess grout as you go. Contrasting grout can stain or leave a grout haze and should be avoided unless hand grouting or using a grout bag.
• Allow the grout to fully cure, usually 48 hours.

TOP COAT SEALER

• Completely clean and dry the limestone with pH neutral detergent, removing any residual mortar or debris. Never leave spills, drips, footprints, or any other marks on the stone prior to sealing.

FOR INTERIOR INSTALLATIONS

• Apply Fila Matte Finish Protective Wax in thin layers until the stones are fully coated, wiping off any excess sealer before it dries. Do not over-seal as thick or excessive application of sealant can dry unevenly and result in an undesirable waxy film on the surface of the limestone. Allow sealer to cure, typically 1-2 days before using the space. Always follow the sealant manufacturer’s application instructions.

FOR OUTDOOR INSTALLATIONS

• Apply 511 Porous Plus sealer in thin layers until the stones are fully coated, wiping off any excess sealer before it dries. Do not over-seal as thick or excessive application of sealant can dry unevenly and result in an undesirable waxy film on the surface of the stone. Allow sealer to cure, typically 24-48 hours before using the space. Always follow the sealant manufacturer’s application instructions. DO NOT use Fila Matte Finish Protective Wax in outdoor applications as UV rays can cause discoloration over time.
• ALWAYS cover limestone with durable paperboard during and after installation to prevent damage and/or staining of the stone pieces until construction is complete.

TRIM

• We recommend installing limestone from floor to ceiling or bringing drywall flush with the finished surface of your stone to eliminate the need for trim.
• If you have an exposed edge with your design, we recommend mitering your limestone. Your experienced installer should be familiar with cutting the edges at a 45-degree angle to create a corner out of two stone pieces. This will mimic a finished trim piece and can easily be done on site to get the finished look without ordering custom trim.
• If you do require trim, we recommend Schluter strips, which can be found at www.schluter.com.

ONGOING MAINTENANCE

Limestone is a natural stone product. As such, clients should expect natural wear and patina to occur to the finish over time.

CLEANING

• Vacuum or sweep limestone regularly to remove abrasive material that can scratch the surface.
• Promptly clean up any spills, especially oil and grease. Un-cleaned spills can cause stains.
• Floors and walls can be wiped or mopped with warm, clean water and a pH neutral cleaner.
• Limestone should be cleaned using pH neutral cleaners ONLY. Use of acidic cleaners will damage the stone. For regular cleaning, we recommend Miracle Sealants pH Neutral Tile and Stone Cleaner. For heavier stains, we recommend Miracle Sealants Heavy Duty Cleaner (Acid Substitute).

RE-SEALING

• Limestone should be re-sealed as often as needed, depending on traffic and wear and in accordance with sealant manufacturer’s instructions.

INSTALLATION SAFETY

• Installers should always wear a protective face covering (e.g., dust mask) and eye protection when unpacking, cutting and installing Zia Tile products as well as working with the mortar, sealants, grout and other materials associated with the tile installation process in accordance with California Prop 65. WARNING: Cancer and Reproductive Harm -www.P65Warnings.ca.gov. If extensive cutting is required during installation, Zia Tile recommends this work be done outside or in a well-ventilated area. Finally, always be sure to wash your hands well with soap and water after working with tiles and before eating. Learn more about Proposition 65 Warnings.

VARIATION SCALE