Masonry Magazine June 2012 Page. 31
masonry and roofing contractors better options to serve their building owners.
Early in my career, prior to the sealants that had evolved into what we see used today, bituminous mastics commonly were used to lap flashings, patch around dowels and seal penetrations that passed through the wall. Bituminous mastics, when used now, should be checked for compatibility with today's flashings. When determining the compatibility between products, simply call the manufacturer and ask. Once your question is answered, request a letter stating the approval or disapproval of the product.
Sealants
Butyl
BUTYL HAS HAD A LONG RUN in the construction industry, primarily due to the adaptability of the product to the roofing industry. Butyl, a synthetic rubber, is available in sealant tube form as well as convenient tape rolls. Butyl typically is more economical for the contractor to use in the correct application than some of the other sealants on the market.
When making a flashing lap or sealing around dowels, butyl is a smart choice. Butyl cannot be used for general joint sealing, expansion joints or any exposed joints, as this material remains uncured and loose for the life of the product. Butyl is compatible with today's Polyvinyl chlorides, Thermoplastic Polyolefins, EPDM, Laminated Copper Fabrics and most Rubberized Asphalts.
Polyurethanes
POLYURETHANES HAVE BEEN the sealant of choice by many masonry contractors to seal masonry-to-masonry, masonry-to-dissimilar material and flashing laps, and today's polyurethanes are the most commonly used and accepted sealants for the mason contractor. Polyurethanes typically are one-or-two part sealants that offer a wide range of colors for many of your construction-related joint sealing.
Polyurethanes offer a life span ranging from six to 10 years, depending on exposure and geographical location. The working temperatures of polyurethanes are limited from 40 degrees to 95 degrees. The tack-free time of polyurethane is typically four hours. Single part polyurethanes typically are moisture cured, and the two part sealants are chemically cured.
Modified polyether (polyether)
MODIFIED POLYETHERS have become a new force in the sealant industry. Polyethers are modified silicones that have the
IT'S HARD TO
BELIEVE THAT
ANYONE CAN
IMPROVE UPON
NATURE.
BUT WE DO!
WHAT MAKES INDIANA CUT STONE THE
LEADER IN THE INDIANA LIMESTONE INDUSTRY?
ARCHITECTS, BUILDERS AND CONTRACTORS
FROM ACROSS THE COUNTRY KNOW THAT ICS
IS AN EXPERT IN FABRICATION AND ACCURACY.
THEY RELY ON US TO DELIVER LIMESTONE TO
EXACTING SPECIFICATIONS, ON-TIME AND
ON-BUDGET, PROJECT AFTER PROJECT.
Indiana Cut Stone
Natural. Eternal. Limestone.
www.masonrymagazine.com
MPE-1
TOTALFLASH
BTL-1
WWW.INDYSTONE.COM
QUALITY, EXPERIENCE. EXPERT CRAFTSMANSHIP
READER SERVICE #173
June 2012
MASONRY 29