Newsletter Archive

Newsletter- November 2013

June 5, 2014

Brrrrrr!!! Baby, it’s cold outside……

The bond strength of mortar is considerably reduced when mortar is frozen prior to hardening. The chemical reaction between water and cement (hydration) progresses very slowly below 40 degrees F. Protection is necessary if the outside air temperature is 40 degrees and falling. Admixtures or anti-freezes should not be used to lower the freezing point of mortar. The effectiveness of most of these compounds is due to the calcium chloride they contain acting as accelerators.

Calcium chloride cannot be used on limestone. Salts cause efflorescence and may cause spalling or flaking through recrystallization (crystal growth).

Heating all materials must be considered. Sand contains some moisture that will form ice when stored in freezing temperatures and must be heated to thaw the ice. Sand must be heated slowly to prevent scorching. Mixing water should not be above 160 degrees F to prevent the danger of flash set with cement. The mortars should be between 40 and 120 degrees F when used.

Stone should be covered with tarpaulin, felt paper, or polyethylene, and heating units used to warm the stone. Caution must be used to prevent smoke under the covering from salamanders.

Never set stone on a snow or ice-covered bed. Bond cannot develop between the mortar bed and frozen supporting surfaces.

If stone is to be set during cold weather the cold weather masonry construction recommendations of the International Masonry Industry All-weather Council should be followed.

COLD WEATHER MASONRY CONSTRUCTION AND PROTECTION RECOMMENDATIONS

by the International Masonry Industry All-Weather Council

The consensus of this Council regarding recommendations for cold weather masonry construction and protection is as follows:

Work Day Temperature: Above 40°F

Requirement: Normal masonry procedure
Protection: Cover walls with plastic or canvas at end of work day to prevent water from entering masonry.

Work Day Temperature: 40°F – 32°F

Requirement: Heat mixing water to produce mortar temps between 40°F – 120°F
Protection: Cover walls and materials to prevent wetting and freezing. Covers should be plastic or canvas.

Work Day Temperature: 32°F – 25°F

Requirement: Heat mixing water & sand to produce mortar temps 40°F – 120°F
Protection: With wind velocities over 15mph, provide wind breaks during the work day and cover walls and materials at the end of the work day to prevent wetting & freezing. Maintain masonry above freezing for 16 hours using auxiliary heat or insulated blankets.

Work Day Temperature: 25°F – 20°F

Requirement: Mortar on boards should be maintained above 40°F
Protection: With wind velocities over 15mph, provide wind breaks during the work day and cover walls and materials at the end of the work day to prevent wetting & freezing. Maintain masonry above freezing for 16 hours using auxiliary heat or insulated blankets.

Work Day Temperature: 20°F – 0°F

Requirement: Heat mixing water & sand to produce mortar temperatures
between 40°F – 120°F
Protection: Provide enclosures & supply sufficient heat to maintain masonry enclosure above 32°F for 24 hours.

Indiana MWBE Enterprise B2B Showcase

Indiana Limestone Services

On October 22, ICS participated in the first ever Indiana MWBE B2B Showcase at the Indiana Government Center in Indianapolis, IN. Over 80 businesses participated in this event and we had the opportunity to showcase the capabilities of our fabrication facility to GC’s, representatives of various Indiana cities and government agencies.

Ernie's Two Cents

Buff vs. Grey

As we wind down the year, we also find ourselves at the end of the quarry season with few Buff stone options. Might we interest you in Grey or Full Color Blend? As we move into the winter months, I strongly suggest you consider one of these color options for your project. The texture, grain and coloring of these grades are excellent. The color variation will add character and warmth to your project appearance. We would be happy to send you samples if you would like to see the coloring and texture, shoot us an email, order online or call the office.

Is there something you would like to hear Ernie sound off on? Email him: ernie_baker@indystone.com

Project Spotlight

Indiana Limestone Custom Windows

Our project spotlight this month is Chapel of St. John the Divine in Champaign, IL. This project called for replication of existing tracery windows. The mason on the project was English Brother in Champaign and the project manager was Rick Schmoldt. St. John’s was an AIA Award winner in 2008 for Preservation Design.