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Hey Heidi

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

Code Based R-Values vs. Effective R-Values

Posted on August 1, 2017

Q: For pre-insulated Concrete Masonry systems, what is the difference between code based R-values & effective R-values? 
-Misleading Effective R Values 

A: Dear MERV, For concrete masonry, effective R-values typically mean that the R-value is adjusted to account for the thermal mass of a CMU wall system. It can also take into account other variables, such as thermal lag or annual averages. Code based R-values are calculated based on either test data or...Read More

Density & Concrete Masonry – Performance Variations

Posted on July 19, 2017

Q: Is the compressive strength (PSI) of Concrete Masonry Units effected by density and what are the main performance variations associated with the different densities? 
-Are Lightweights Better In the Envelope? 

A: Dear ALBIE, For architectural units, aesthetics are a major consideration. The light weight aggregate available in the Northeast is a very dark grey, which is visible in ground face & polished units. For standard grey block, mix designs can have different densities, depending on the amount of light weight aggregate used...Read More

Concrete Masonry, Resiliency, Thermal Mass & Passive Survivability

Posted on June 7, 2017

Q: We are designing a large health care facility.  What role can Concrete Masonry play in creating a resilient structure?
-Resilient Construction Has Extreme Longevity

A: Dear RaCHEL, Concrete masonry construction has strength, durability, longevity, fire resistance, seismic and blast resistance, all of which contribute to the resiliency of the built environment. The durability of concrete masonry construction is well known and vital during the more visible aspects of natural disasters such as floods, hurricanes and tornadoes....Read More

Stormwater Management Alternatives For an Over Budget, Over Crowded Site

Posted on May 7, 2017

Q: We have a project which is over budget and has limited space. Is it possible to eliminate catch basins and retention ponds if we use a Permeable Articulating Concrete Block (P-ACB) paving surface?
-Stormwater Alternatives are a Must-have

A: Dear SAM: Depending on the soil type and specific site conditions, it is possible to eliminate traditional storm water infrastructure, such as catch basins and retention ponds, by using a high performance permeable articulating  concrete block (P-ACB) paving surface.  These systems allow for a more natural, vertical infiltration path, recharging local...Read More

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Hey Heidi

  • Concrete Masonry Structures and Embodied Carbon
  • Keeping Single Wythe CMU Masonry Leak Free
  • Concrete Masonry Aesthetic Options
  • How It’s Made
  • 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
  • Do Single Wythe CMU Walls Need A Vapor Barrier?
  • EPDs and measuring the Environmental Impacts of CMU
  • 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

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