FOR PROFESSIONAL USE ONLY
When used in interior applications subject to floor coverings, follow the directions of the flooring and adhesive manufacturer to determine the maximum allowable moisture content (RH) or transmission of the substrate. If the moisture content (ASTM F-2170) or moisture vapor transmission rate (ASTM F-1869) of the substrate exceeds the requirements of the flooring system, utilize Platform EMS AFTER deep concrete repairs (minimum ½” in confined areas) are completed with Platform RC. Platform RC will not inhibit transmission of moisture to the finished flooring.
All Substrates must be sound, clean, dry and free of contaminants (oil, dirt, laitance etc.) that may interfere with adhesion. Do not use solvents, acids, chemical adhesive removers to prepare the substrate. All bond breaking substances (cure residues, excess salts from silicates etc.) must be removed prior to priming. Completely vacuum all dust and debris from the substrate prior to material application.
Honor all moving joints. Complete crack and substrate repairs prior to installation. Consult an engineer for required joints and crack repairs prior to installation.
Maintain a minimum of 50ºF prior, during the application and for 72 hours after installation. Acclimate the material to a minimum of 50ºF prior to mixing.
If uncertain of suitability or bond, test an inconspicuous area for compatibility and adequate bond prior to proceeding.
Surface Preparation
Concrete Floors
All concrete must be sound, stable, clean and free of any bond breaking materials (silicates, curing compounds, laitance, dirt). Mechanically remove weak surfaces (by shot blasting or grinding with dust removal), and any contaminants to sound concrete. Prime prepared concrete by Saturate, Surface Dry method (SSD).
Feather edge installations may be realized by;
1. Keying out surrounding concrete to 3/8” deep so edge of Platform RC is at least 3/8” thick. Suitable for use under moisture remediation coatings.
2. Carry repair to a a minimum depth of 3/8” and finish from 3/8” to feather with a suitable polymer modified patch.
Platform RC offers exceptional volume stability, in any case good placement practice requires control joints every 10 ft. Larger placements deeper than 1.5” benefit significantly from the addition of suitable aggregate.
Wood
Platform RC can be utilized in some situations over wood substrate. In all cases wood must be (screwed & glued) APA rated, exterior grade wood floors free of deflection. Mechanical means (wire mesh, suitable lath) mush be mechanically fastened to the wood in all bond line areas. In all such cases Platform RC cannot be applied to less than 3/8” in thickness. Utilize a suitable polymer modified patch to take ramps/repairs to feather edge.
Gypsum substrates
Not recommended for use over gypsum floors. Contact Platform for a superior patch material compatible with gypsum substrates.
Application Procedures
Mixing
Water: Up to 1.9 - 2.1 US Qts (1,8 - 2,0L) per 50 lb bag
Platform RC is very sensitive to water content, do not overwater.
Given the exceptionally low water ratio, mix by mechanical mixer. Once shear is introduced, the material will loosen and slump as designed. DO NOT add additional water based on initial mix.
Mix Method: Most applications benefit from the use of a suitable mortar mixer. Prewet and drain excess water from the mortar mixer. Ensure mortar mixer is in good running condition prior to adding material. Add 2/3’ – ¾’s the required water for the number of bags in mix prior to adding Platform RC. Add 2/3 the total mix material, followed by any aggregate extension. Aggregate must be clean and dampened (do not add dripping aggregate as additional water will impact material performance). Add the final portion of water when adding the final bags to the mix. Mix for a 2-3 minutes after final bag is added.
Correct mixing will generate a homogenous, flowable screed of rampable consistency. Overwatering and/or under mixing will result in difficult placement and lower ultimate compressive strengths.
Clean the mixer regularly as material will begin to set if left beyond 20 minutes. Mix no more material than can be placed within 20 minutes. Do not remix with additional water.
Material Application
Pour the flowable material in place (by wheelbarrow or similar) and set height or slope by screed. In many cases a screed finish will provide suitable profile for subsequent materials to mechanically bond, and/or for slip resistance of foot traffic (finish with a broom texture if desired for direct foot traffic on ramps). Once material reaches initial set, it may be finished (if desired) to a very smooth texture by trowel or float.
Dry Time Prior to Flooring Installation
Platform RC is self drying, wet cure/wet burlap may be sued to counter rapid moisture loss in very hot and dry conditions. Depth of placement and ambient conditions (temperature and humidity) will impact the dry time of the material. Material is typically ready to accept light trade traffic after 4-6 hours.
