Preparing the Wall Surface
All drywall finishing should comply with Association of Wall and Ceiling Industries-International (AWCI), Painting and Decorating Contractors of America (PDCA) specifications, Level 4 or Level 5 as a guide. By incorporating the appropriate Level of Finish of the recommended specification into the project documents, the architect, general contractor, and building owner can better anticipate the finial appearance of the decorative wall or ceilings covered with SanFoot Natural Wood Wallcovering. “All joints and interior angles shall have tape embedded in joint compound and three separate coats of joint compound applied over all joints, angles, fastener heads, and accessories.” All surfaces shall be clean, smooth and dry prior to applying primer and the application of SanFoot.
Gypsum wall board finishes are specified by ASTM C 840 and Gypsum Association GA-214-M-97. These documents are summarized below.
- Level 0 - There is no tape, joint compound, corner bead or any other accessories. Used as a temporary barrier or in areas where the finishes have not been determined.
- Level 1 - Tape is embedded in a single layer of joint compound at all joints and interior corners. The surfaces must be free from excess joint compound, but tool marks and ridges are acceptable. Generally used above ceilings and in back-of-house areas.
- Level 2 - Tape is embedded in a layer of joint compound and then tooled with an additional thin layer of joint compound. Fasteners and accessories shall be covered with one layer of joint compound. The surfaces must be free from excess joint compound, but tool marks and ridges are acceptable. Generally used above ceilings and in back-of-house areas, garages, and mechanical rooms.
- Level 3 - Tape is embedded and tooled with an additional thin layer of joint compound (Level 2). An additional coat of joint compound is applied. Fasteners and accessories shall be covered with two coats of joint compound. Fasteners and accessories shall be covered with two layers of joint compound. All surfaces, including joint compound, shall be smooth and free of tool marks. Used where a heavy wall covering or other heavy textured material will be applied over the wall surface.
- Level 4 - Tape is embedded and tooled with an additional thin layer of joint compound (Level 2). Two additional coats of joint compound are applied to board joints. Interior corners receive one additional coat of joint compound. Fasteners and accessories shall be covered with three layers of joint compound. All surfaces, including joint compound, shall be smooth and free of tool marks. A drywall primer shall be applied prior to final painting. Used where flat paints and lightweight wall coverings will be applied over the wall surface.
- Level 5 - Tape is embedded and tooled with an additional thin layer of joint compound (Level 2). Two additional coats of joint compound are applied to board joints. Interior corners receive one additional coat of joint compound. Fasteners and accessories shall be covered with three layers of joint compound. Finally, a thin skim coat of joint compound (or other specialized material) is applied to the entire surface of the wall. All surfaces shall be smooth and free of tool marks. Level 5 is the highest level of finish and is used where semi-gloss, gloss, or other non-textured paints are used. Also used where severe lighting conditions occur, such as wall-wash light fixtures.
Specification for Optimum Installation – New Dry-Wall
- 1. Prime new dry wall with two (2) coats of Roman PRO-977 Ultra Primer applied @ recommended spread rate. Allow each coat to dry overnight.
- 2. Apply one (1) coat of Roman PRO-935 (R-35) Adhesion Promoting Primer @ recommended spread rate. Allow to dry overnight
- 3. Apply Roman PRO-732 Extra Strength Clay Adhesive @ recommended spread rate to the back of the wood veneer sheet / panel. Book for 5 minutes then hang and smooth using a plastic smoothing tool.
Specification for Optimum Installation – Existing Dry-Wall
- 1. Remove existing wall covering using Roman Piranha Wall Paper Stripper. Follow directions on container.
- 2. Seal existing dry wall with one (1) coat of Roman Rx-35 (PRO-999) applied @ recommended spread rate. Allow to dry over night
- 3. Apply two (2) coats of Roman PRO-977 Ultra Primer applied @ recommended spread rate. Allow each coat to dry overnight
- 4. Finally, apply one (1) coat of Roman PRO-935 (R-35) Adhesion Promoting Primer @ recommended spread rate. Allow to dry overnight.
- 5. Apply Roman PRO-732 Extra Strength Clay Adhesive @ recommended spread rate to the back of the wood veneer sheet / panel. Book for 5 minutes then hang and smooth using a plastic smoothing tool.
Surfaces painted with alkyd/oil paint will not allow the moisture to be absorbed into the drywall. Therefore, a wall-liner must be applied before proceeding with hanging SanFoot. Allow sufficient time for the moisture in the adhesive used to install the wall-liner to evaporate and cure. Contact your SanFoot distributor or Jacaranda Inc. to get recommendations for wall-liners. A paper wall-liner is all that is needed in this application.
Sand painted surfaces to break the seal. All painted surfaces must be primed with PRO-935 (R35) by Roman Decorating Products to ensure strong bond of SanFoot. Allow freshly painted drywall to cure at least 14 days prior to priming and installing SanFoot.
Prime damaged areas such as torn drywall facing paper, over skim coat repairs and old adhesive residue with PRO-977 by Roman Decorating Products.
New plaster (1/2” to 3/4” thickness) - Ideally new plaster walls should age 60 to 90 days before painting or installing SanFoot. If you cannot wait, then wash newly plastered walls with zinc sulfate solution to neutralize the lime (2-4 pounds of zinc sulfate crystals per gallon of water). If new plaster surface is chalky, prime with PRO-977 by Roman Decorating Products.
All efflorescence crystals must be removed before starting the installation. All undulations in the plaster must be smoothed to a flat finish. Installation of previously painted plaster surfaces must be installed with attention to the type of paint applied to the surface and the number of coats it has received over time.
If the painted surface can not be broken by sanding then a wall-liner must be installed before applying SanFoot over painted plaster to allow the moisture to be wicked away.
Concrete, Ceramic Tile, Marble or other Un-leveled or Irregular Surfaces
Contact your SanFoot Distributor or Jacaranda, Inc. for more information.
MDF, Particleboard, other Wood Composites or Hardwood Plywood
All surfaces should be completely free of excess dust, oils or other foreign matter and maintained as smooth as possible. All seam joints in the substrate should be mudded and sanded to fill all gaps for a completely smooth surface. Prime all surface areas with Pro-935 by Roman Decorating Products before starting the installation of SanFoot. Keep in mind that your substrate will not allow a lot of moisture to be absorbed, therefore you will use a little less adhesive in this application than over drywall.
Non Porous Surfaces
1. Preparation: Always be sure that both surfaces to be bonded to are clean and free of all dust and foreign matter. The SanFoot and substrate should be stored in the same environment for 24-48 hours before starting the installation.This will allow both products to acclimatize before bonding.
2. Adhesive: When using a contact adhesive, always insure 100% coverage on both the back of the SanFoot and the face of the substrate. Le the adhesive have the correct amount of dry open time. If you bond to soon, you will trap gases that will later call blisters. The time can vary depending on airflow around the work area, and ambient temperature and humidity conditions at the time of installation. Follow the contact adhesive manufacturers instructions.
3. Bonding: When a contact adhesive is being used the best method of pressure is a lot of pressure all at one time. This pressure can be applied by using an acrylic smoothing tool covered with a flet cloth to prevent marring the SanFoot. (Do NOT use a J-Roller for applying pressure.) Starting in the center of the surface to be bonded, push the smoother from the center to the outside of the work piece. Push down as hard as possible. Keep doing this as you move over three to four inches at a time (your smoother should be 4-5 inches wide) until you have rubbed down the entire surface.
Do NOT Use a J-Roller to Apply Pressure
4. Time – Don’t Rush your work. In order for contact cement to work, a chemical reaction must take place. This reaction produces gas and you need to allow this gas to escape from the edges. Many jobs appear perfect and then blisters start to appear. Reason for this may include: 1) insufficient adhesive coverage; 2) Not enough pressure was applied to form an intimate bond; 3) Insufficient amount of open time.
Follow All instructions carefully. Do NOT rush the instalation.