Construction Education-Construction Instruction

This post originally appeared on the Green Building Advisor’s website.  https://www.greenbuildingadvisor.com/

I recently took a trip to Denver, Colorado for a couple days of construction education, specifically a two-day class on high performance HVAC and IAQ.  The course was offered by Ci, or Construction Instruction and combined classroom learning with real-world, hands-on education in their adjacent testing center.

Continue reading “Construction Education-Construction Instruction”

Construction Materials-Cavity Insulation

Heat wants to move from someplace hot to someplace cold.  It’s desire to reach equilibrium is one of the principles of the second law of thermodynamics.  We have many methods and materials we use in construction to try to slow this movement.  It’s expensive to condition a space and we want to hold on that space conditioning for as long as possible.  One way we try to slow heat loss or gain is to prevent the wind from blowing through the home.  Another is to shade the sun from beating through a window on a hot, sunny day (in some climates at certain times of the year, the sun can be a blessing).  Insulation is one of the big ones we use to provide comfort to homeowners.

Continue reading “Construction Materials-Cavity Insulation”

Construction Design-Heated Floors and Floor Coverings

Best Choices and What Should Be Avoided

One of the first jobs I had when I started my career in the construction industry, back when I was working as an electrician, was installing electric resistance heating cables for a basement heating system.  It took two people, one person pulled (me) while a second person pushed (my brother) and guided a small manual plow which installed electric heat cabling just under the surface of a sand layer.  Concrete would then be poured over the sand; the result would be a heated floor.  As it turned out, there was a high percentage of cable failures with this system, which resulted in many people having to install a new heating system.

Hot water radiant heat in a slab on grade home.

Continue reading “Construction Design-Heated Floors and Floor Coverings”

Construction Materials-Sealants

This post originally appeared on the Green Building Advisor website.  www.greenbuildingadvisor.com

I once heard Dr. Joseph Lstiburek use the term “pookie”, which made me chuckle.  He was referring to a fluid type product used to seal something.  In construction, we use a lot of different caulks, sealants, and adhesives, all of which are available in some sort of tube or bucket.  A walk through the caulking isle at any hardware store or lumber yard can make your head spin, what to use when and where.

Continue reading “Construction Materials-Sealants”

Diagnostic Tools-Thermal Imaging-Interpreting the Images

This blog post originally appeared on the Green Building Advisor’s website.  www.greenbuildingadvisor.com

Thermal imaging has numerous uses and benefits many different trades.  Everything from surveillance and industrial maintenance to checking someone’s temperature.  For this post, I’ll discuss interpreting images in the residential construction field. 

It’s important to have at least a basic understanding of how the camera works and adjustments that can be made to the different camera settings, I’ll briefly discuss a few of the settings.  It’s also helpful that you have somewhat of an expectation when viewing a thermal image.  Outside environmental conditions can affect an image taken inside a building, the conditions typically present in a predictable way, but not always.  Sometimes something unexpected shows up, usually this requires more investigation, possibly confirmed using other diagnostic tools or may even require the disassembling of a building component.

Continue reading “Diagnostic Tools-Thermal Imaging-Interpreting the Images”

Testing-Failed a Code Required Blower Door Test, Now What?

2012 was the first year the International Energy Conservation Code required residential construction to pass an air leakage rate test, better known as a blower door test.  My area of the country requires the test to be at or below 3 air changes per hour at the test pressure of 50 pascals (ACH50).  (Other areas, typically warmer climates require 5 ACH50.)  Most new construction in my market has no problem passing the test, but I have had a handful of houses fail, usually the failed tests are by a builder having their first blower door test or the project is a very small home.

Continue reading “Testing-Failed a Code Required Blower Door Test, Now What?”

Construction Design-Flashing Details and the International Flashing Awareness Day 2022

Late summer, 2021, Aron Jones (bigdogconstruction.gm on Instagram) and Gina Hoyt (bigdoglifex3 on Instagram) started the International Flashing Awareness Day to bring awareness to the importance of correct flashing details.  I participated by posting a failed assembly that was lacking correct flashing on my Instagram account.

This year the International Flashing Awareness Day is on Friday, August 26, 2022.  Instead of producing a quick post for Instagram, I decided instead to write a blog covering the subject of flashing in construction.

Continue reading “Construction Design-Flashing Details and the International Flashing Awareness Day 2022”

Building Science-Pyrolysis

This post originally appeared on the Green Building Advisor website.  www.greenbuildingadvisor.com

Pyrolysis [pahy-rol-uh-sis] noun

The chemical decomposition of wood by the application of heat alone in the absence of oxygen.

I used to perform risk assessment inspections for a couple small, local mutual insurance companies.  These companies would insure properties that were considered “high risk”, most were rural, some were accessible only by boat, ATV or snowmobile and they were often a long way from the nearest fire department.  Many had solid fuel burning appliances, usually a woodstove or fireplace.  Part of my job was to make sure that the woodstove or fireplace had the proper clearances to combustibles, proper floor protection, and that the stovepipe and chimney systems met the requirements of the manufacturer and/or code.  Most installations were safe, but every once in a while, I would find a home in danger of burning down. Continue reading “Building Science-Pyrolysis”

Building Diagnostics-Blower Door Testing-Calculating a Home’s Volume

This article first appeared in the July/August 2022 issue of the Journal of Light Construction.   www.jlconline.com.   Strangely enough, they chose to put me on the cover.

A blower door is designed to measure the volume of air moving across the blower door fan at a specific pressure difference between inside and outside the home.  The volume of air measurement in the US is cubic feet per minute (CFM) and the pressure differential is measured in Pascals (50 Pascals is the standard for residential construction).  One of the more common metrics used to express air leakage in a home is air changes per hour (ACH).  The only way we can calculate that metric is by measuring a home’s volume.

Continue reading “Building Diagnostics-Blower Door Testing-Calculating a Home’s Volume”