Wednesday, May 27, 2009

Hot Weather & Tile / Stone Installations

Conventional Portland cement mortar beds, thin-set mortars, cement plasters and stuccos are often permanently damaged when subject to hot, dry temperatures or desert climates immediately after installation. High temperatures remove the water content of the mortar required for Portland cement hydration, curing and strength development. In addition, rapid drying often causes mortar to crack, crumble or lose bond.

Waterproofing membranes, anti-fracture membranes, epoxy adhesives, epoxy grouts, waterproofing membranes and many other tile & stone installation products will also be affected by hot working temperatures. Flash setting and reduced working time can result. It is important to note that surface temperature is more important than air temperature. Therefore, monitor the surface temperature of the installation. Click here to see a GREAT tool to do this.

There is a simple rule to follow when an installation is subjected to high temperatures:

The 18º Rule – for every 18ºF above 70ºF (10ºC above 21ºC), Portland cement and epoxy based materials take half as long to cure.

To read more, click here.

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