Interior Flooring Manual
Expansion Joints and Control Joints Expansion joints are gaps between adjacent slabs, and allow independent movement of each slab. Do not install any flooring over expansion joints. Make sure the flooring stops short of the expansion joint, and install a suitable transition cap or threshold. This product should be designed to permit slab movement, while preserving the quality of the installation and preventing damage to the flooring. Application of a 3 in. (7.6 cm) band of #650 epoxy adhesive beneath the flooring adjacent to the expansion joint is required to minimize dimensional changes of the flooring and moisture intrusion. Control joints are designed to control cracking during slab movement. Following the manufacturer’s directions, open, clean, and fill chase cuts, control joints, and saw cuts with an approved patching compound. Refer to Patching Compounds on page 9.
Disclaimer: Lonseal is not liable for damage resulting from telegraphing of any substrate disfigurement or hazard due to installations over control joints, cracks, or expansion joints.
Permanent HVAC Using the permanent HVAC system, ensure the slab is conditioned to a temperature between 65 – 85 °F (18.3 – 29.4 °C) for 48 hours before, during, and 48 hours after installation. Old Adhesive Residue Different kinds of adhesives can react adversely to each other. This can result in chemical reactions that cause adhesive emulsification, bond failure, indentations, or staining of the flooring. The slab must be thoroughly cleaned to remove all contaminants and adhesive residues through mechanical methods only.
Note: Read warnings regarding removal of old cutback adhesives as published in the most current revision of RFCI – Recommended Work Practices for Removal of Resilient Floor Coverings. This document is available at www.rfci.com .
Substrates and Preparation All substrates and preparations must be per ASTM F2678. If a subfloor or substrate is not noted, then it is not recommended for use with Lonseal flooring. Installation over these unapproved subfloors or substrates could cause installation issues or failures, and are not covered under any Lonseal warranty.
Wood Subfloors
Structural Requirements The system must be composed of double-layer construction, and must be smooth, sound, and made of solid, exterior grade plywood with a minimum overall thickness of 7/8 in. (22.2 mm). All panels used must meet the criteria set forth by APA – The Engineered Wood Association. Refer to the most current APA Document E30 for additional information on selection, placement, and installation. A list of manufacturers who provide plywood panels meeting the requirements noted in this manual may be found at www.apawood.org . All subfloor panels (bottom layer) must be 5/8 in. (15.9 mm) thick minimum, and classified as APA Panel Subflooring. Panel thickness must increase for joist spacing over 16 in. (40.6 cm) on center to minimize deflection. Underlayment panels (top layer) must be 1/4 in. (6.4 mm) thick minimum and meet the requirements noted in Underlayment Panel Selection on page 7. Other requirements are as follows: Provide a minimum of 18 in. (45.7 cm) well-ventilated air space, measured from the bottom of the floor joists to the top of grade. Provide a 0.004 in. (4 mil or 0.1 mm) polyethylene membrane on grade, with a 6 in. (15.2 cm) overlap at the seams, as a ground moisture barrier where necessary. Provide insulation as required by code.
LONSEAL ®
Page 6 of 17
Revised: 9.20.2024
Disclaimer: Printed documents are uncontrolled. Always refer to www.lonseal.com for the most current technical information.
Made with FlippingBook interactive PDF creator