We recently wrote about the unique challenges of building in USDA Hardiness Zone 6A. If you haven’t reviewed that article, yet, go ahead and skim it over!
Continuing that important conversation, this month we’re diving into one of the biggest insulation mistakes we’ve seen builders make: Choosing primarily spray foam for Northern Wisconsin homes.
We’ve watched builders from warmer climate zones bring their standard spray foam approaches north, only to face problems they never anticipated. Beautiful homes that look perfect during construction later develop serious issues, once they face our extreme temperature swings and heavy snow loads.
The same building techniques that work flawlessly in Milwaukee or Madison often create expensive problems in the Northwoods. And spray foam can be at the center of many of these failures.
Do Houses Move as When Weather Changes? YES!
Houses in our climate zone don’t just sit still. They actually move – a lot!
During our coldest winter nights, you’ll actually hear houses adjust to temperature changes, creaking and cracking throughout the cold snaps. This expansion and contraction is normal and necessary. Buildings need to be allowed to move with our extreme temperature swings.
But spray foam locks everything in place! When applied throughout a structure, it prevents the natural movement that Northern Wisconsin homes require.
So when a building decides to move and spray foam won’t let it… something has to give.
The foam cracks. Air leaks develop. And suddenly, you have durability issues hidden inside walls, behind siding, and under roofing!
Can You Install Spray Foam Year-Round? NO!
Spray foam requires very specific conditions for proper installation. The jobsite environment must be warm, dry, and clean.
Obviously, getting those conditions in Northern Wisconsin construction can be difficult – and expensive! We get very cold winters and hot summers. You have to heat the entire under-construction building to make spray foam installation safe and durable.
Even when you manage to create ideal conditions, you’re taking on a much higher installation risk. Our climate makes spray foam failure more likely.
Does Spray Foam Create Health and Safety Risks? YES!
When spray foam fails in Northern Wisconsin conditions, it doesn’t just cause energy-efficiency problems, tt creates health and safety concerns as well.
Failed air sealing behind walls can lead to moisture problems you can’t detect until significant damage has occurred. These problems can include poor indoor air quality, mold growth in hidden areas, and structural issues from repeated freeze-thaw cycles. Also, when foam fails due to improper installation or environmental issues, toxic offgassing can occur, which may lead to misunderstood health concerns.
Building Science is the Solution
At RVI, we don’t make insulation recommendations based on what’s popular or heavily marketed. We use building science principles that account for the specific climate challenges of Northern Wisconsin, where we live and work every day.
Our approach combines proper insulation with strategic air sealing that allows for building movement. We create thermal envelopes that perform reliably during our coldest winters and hottest summers.
As a result, we help build homes that stay comfortable, energy-efficient, and structurally sound through decades of Wisconsin weather extremes.
What Works Better Than Spray Foam?
In Northern Wisconsin, perfect attention to detail, along with proper air sealing will outperform spray foam in nearly every application. We stand firmly behind BIBS (Blown-In-Blanket System) because it provides excellent R-value while allowing necessary building movement. It’s vapor open, so moisture can dry naturally. And it installs reliably in any weather conditions.
This product, coupled with strategic air sealing, addresses thermal envelope issues without locking the building in place. We seal where it matters while allowing movement where it’s needed.
This combination delivers superior long-term performance, compared to spray foam approaches that can work in warmer climates but may fail in ours.
We’ve seen the failures. We know which approaches work long-term and which create expensive problems down the road. We understand how buildings behave through multiple Wisconsin winters.
That local knowledge makes the difference between insulation that performs for decades and insulation that becomes a liability!
So if you’re building in Northern Wisconsin and someone immediately recommends spray foam without understanding your specific project, climate zone, and performance goals – be skeptical. Good insulation decisions start with understanding your building’s unique requirements within the specific climate you’re building in.
At RVI, we evaluate every project individually. Sometimes that means explaining why certain choices may not be the right choice for Northern Wisconsin conditions. We trust building science principles over marketing claims that don’t account for our climate reality.
Ready to discuss insulation options that actually work in our climate zone? Contact RVI to get a quote from building science experts who understand what it takes to create comfortable, efficient homes that perform reliably throughout Wisconsin’s weather extremes!
