Single-Ply Recommendations

39 – March 1993

The following are recommendations put forward by the CRCA Single-Ply Sub-committee reflecting the current state of the art in design and application.

1. EPS under loose-laid single-ply membranes shall be Type 1 with a minumum Compressive Strength of 69 kPa (10 psi). Type 1 minimum thickness shall be 2″ in one layer.  Lower thicknesses require a minimum of 7/16″ fibreboard cover.  EPS must meet CGSB Standard and be third party certified.
2. Concrete decks require a separation layer of a Polyester mat cushion separator min. weight of 200/g/sq.m needle punched under loose-laid membrane. The deck shall be steel trowelled.

The opinions expressed herein are those of the CRCA National Technical Committee.  This Technical Bulletin is circulated for the purpose of bringing roofing information to the attention of the reader.  The data, commentary, opinions and conclusions, if any, are not intended to provide the reader with conclusive technical advice and the reader should not act only on the roofing information contained in this Technical Bulletin without seeking specific professional, engineering or architectural advice.  Neither the CRCA nor any of its officers, directors, members or employees assume any responsibility for any of the roofing information contained herein or the consequences of any interpretation which the reader may take from such information.