Choosing a Water Repellant for Masonry

A simple yet effective test that should be part of every waterproofing project is the Rilem Test, which is used to evaluate the volume of water absorption by masonry during a specific period of time.   When properly administered, this test can determine the need for waterproofing; determine the proper product needed; and determine the application rate.

Pictured:  Rilem Tubes attached to building

PROCESS OVERVIEW – Rilem Test Method:

• A tube is temporarily affixed to the masonry substrate and filled with water.
• The height of the column of water, as measured from the center of the bowl to the meniscus in the tube, determines the hydrostatic pressure applied to the test area.  This pressure can subsequently be converted into a velocity, or wind-driven rain speed, of 88.5 MPH
• Different products are then applied to test areas on the structure.
• After one week, the test is duplicated to determine the absorption rate at each of the test areas.
• Comparing the performance of different treatments enables selection of the most effective product.
• Monitoring the test areas enables determination of the coverage rate in sq ft. / gallon.
• Longevity of the system is often dependant on whether the product was applied at 80 sf/gallon or 280 sf/gallon.
• When properly applied, a 10-year, major manufacturer’s warranty can be issued.
• Contact Alpha Weatherproofing to discuss appropriate testing methods for your masonry structures.

Click here to view an informative article titled: The Art and Science of Testing: A Vital Part of the Cleaning Process.  Originally featured in Masonry Magazine, it was written by Lynn Peden, President of EaCo Chem Inc.