Radiant Heat Checklist

 This Guide is a list of suggestions for those who may not have worked with USG’s LEVELROCK Radiant in the past. Poured Floors of NY & NJ has prepared the following information sheet to provide for a smooth and trouble free installation.

          Before the radiant tubing is installed, the sub floor must be inspected for any structural damage, loose areas, holes or voids or any condition that would allow the underlayment to leek thru into areas not being intended to install. Please repair all areas prior to the tubing being installed. Before the radiant tubing is installed, the sub floor must be both broom swept and vacuumed so that the sub floor is free of all dust and debris.
          Should existing sub floor conditions warrant the installation of wire lath as reinforcement, this material must be installed over a moisture barrier such as felt or plastic sheeting to prevent leakage the moisture barrier must be run 3 inch’s up the wall to create a pool for the cement application & prior to the radiant tube installation. Note that leek’s are difficult to stop once the wire lathe has been installed. Please over lap the seams a minimum of 1″ & nail down the lathe to the subfloor. This will minimize any damage to the lathe and moisture barrier.
          MOISTURE BARRIER: USG’s LEVELROCK RH (Radiant) is designed to bond directly to Plywood and Concrete sub floors. It is mandatory to install wire lathe in areas when the addition of a moisture barrier is necessary. Please contact us for the accepted methods of moisture control.
          FASTENING THE TUBES: The radiant tubing must be tightly attached to the sub floor using the tubing manufacturer’s specified fasteners. All tubing must be secured at the loop heads at a distance not to exceed 8” additionally secure the straight runs every 18″s. Tubing that has not been tightly attached to the sub floor may result in the tubes floating, causing the floor surface to have a bump and will need additional attention before it can receive floor covering.
         SLEEPERS: When using sleepers there are several ideas to keep in mind. First the distance to nail the sleepers apart I suggest 16″ on center, however contact your wood installer for their specification. Second you may use any sleeper a minimum of 1″ thick though a 1 1/2″ is normal using a 2X4. Third the height of the top of the sleeper will be the location that the wood floor will be nailed to so if you need to level the room or project you must address the leveling from the sleeper in this case prior to our arrival.
        Test your radiant system using the methods recommended by the tubing manufacturer prior to the installation of the underlayment.
        POUR STOPS: Any area not scheduled to be poured including but not limited to doorways Staircases and landings must have pour stops installed at a height of at least 2” minimum.
       TEMPERATURE REQUIREMENTS: You must maintain a minimum of at least 50 degrees. The Temperature must be maintained until the Gypsum Floor is dry. The area must be kept well ventilated for a period of 1 Day for every 1/4″ of underlayment poured when conditions allow. Failure to maintain the temperature or ventilation will increase the products curing time.
You can expect to walk on the underlayment two hours after the completion of the pour, normal construction traffic can resume within 24 hours. Care should be taken to not scratch the surface with sharp objects. Heavy traffic areas may require additional protection. It is recommended for Ceramic tile installation that the underlayment be treated with theSchluter Ditra anti-fracture membrane prior to the installation of any thin set or glue down flooring products. Please contact us for any issue that needs to be clarified. Information for installing finished floor coverings will be furnished upon request.