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Hey Heidi

Do Single Wythe CMU Walls Need A Vapor Barrier?

Posted on February 1, 2018

Q: For pre-insulated single wythe concrete masonry wall systems, where would the vapor barrier go?
-Vapors Impacting Concrete

A: Dear VIC: For special circumstances, such as an indoor pool or museum quality storage, a vapor barrier could be needed and the variables for each scenario would need to be considered. For general use, pre-insulated CMU mass walls don’t require a vapor barrier. Mass walls behave differently from other structural...Read More

Keeping Single Wythe CMU Masonry Leak Free

Posted on January 1, 2018

Q: Single wythe insulated concrete masonry passes energy code, but how can we keep the walls leek free? And do we need a vapor barrier?
-Leaks Are Really Sad

A: Dear LARS: Single wythe CMU walls have been around for a long time, and with proper detailing, they can be completely leak free. To accomplish this, we recommend a “belt and suspenders” approach. Flashing, weeps, integral water repellent and crack control are key. For extra protection a field applied, breathable, clear...Read More

EPDs and measuring the Environmental Impacts of CMU

Posted on November 1, 2017

Q: After having Environmental Product Declarations (EPDs) done for each one of your Concrete Masonry Unit mix designs, is there anything in particular that you learned?
-Environmentally Lowering Impacts

A: Dear ELI: Having EPDs for each of our mix designs has really helped us see what factors affect the environmental impacts of our products. One interesting thing we uncovered was that previously valued sustainable attributes, such as recycled content and regional materials, didn’t matter as much as we thought for environmental...Read More

Concrete Masonry Aesthetic Options

Posted on October 1, 2017

Q: I’m considering options for the interior on our new project. What Concrete Masonry aesthetic options are available?
-Concrete Aesthetics Masonry Interiors

A: Dear CAMI: Concrete Masonry Units have come a long way since the term “cinder block” was coined and there’s a variety of aggregate colors available to us here in the Northeast. Deep blacks, grey speckled granites, stones that range from peachy to brown and others that range from pink to...Read More

Concrete Masonry For School Construction

Posted on September 1, 2017

Q: For our school project, the structure must be cost effective, resilient, durable, have interior walls with great STC ratings, and must contribute to LEED v4. Is Concrete Masonry Construction a good option? 
-Construction for Economy, Durability And Resiliency

A: Dear CEDAR, We manufacture A LOT of Concrete Masonry Units for school construction, for all of the reasons you asked about, Cedar. Concrete Masonry units come in countless color options, featuring beautiful exposed natural aggregates. They are available with several architectural finishes such as polished, textured polished, ground face and split...Read More

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Hey Heidi

  • The RILEM tube test and Concrete Masonry – not good partners
  • Thermal Mass & Passing Code Using COMcheck™
  • Continuous Insulation (C.I.): Not a Code Requirement
  • Joint Reinforcement In Masonry Veneers
  • How It’s Made
  • Do Single Wythe CMU Walls Need A Vapor Barrier?
  • Keeping Single Wythe CMU Masonry Leak Free
  • EPDs and measuring the Environmental Impacts of CMU
  • Concrete Masonry Aesthetic Options
  • Concrete Masonry For School Construction
  • Code Based R-Values vs. Effective R-Values
  • Density & Concrete Masonry – performance variations
  • Concrete Masonry, Resiliency, Thermal Mass & Passive Survivability
  • Stormwater Management alternatives for an over budget, over crowded site
  • Fire Ratings, Code Compliance, and UL®
  • Type I (N-1) moisture control units
  • Concrete Masonry – Use less insulation with thermal mass walls

Sustainability and Resilience

  • Part 2: How LEED v4 impacts concrete masonry
  • Part 1: Concrete Masonry Is Sustainable

Hey Heidi Blog

Jandris Block
202 High Street | Gardner, MA 01440-3632
Tel. 978-632-0089
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