Most new homes built today follow the prescriptive code path for energy efficiency. Those requirements will depend on the code cycle of your area and your exact climate zone. The requirement for my area are 3, 3.33, 10, 15, 20, and 49. These are the code minimum performance numbers for different assemblies in the home. Let’s discuss each of these numbers, and then I’ll give my opinion as to where I think they should be. I’ll start with the number three and go in the order of the list. Continue reading “Construction Design-Performance Metrics”
Construction Design-Insects and Rodents
When I purchased my old home, the 1952 Cape in late 2018, the basement area looked good. Someone took the time to paint all the concrete walls and floor and cleaned everything up to look nice. Shortly after we moved in, the cat caught a mouse and then the following summer, the basement became a bug gathering place. Ants, spiders and other bugs apparently wintered in another area and returned to my house in the spring.
Construction Design-Using Fibrous Sub-Slab Insulation with In-Floor Heat
I’ve written about sub-slab insulation and heated floors several times over the past couple years, this post is about something I’ve been thinking about for a while now, using a fibrous insulation, like Rockwool’s ComfortBoard 80 or 110 under a concrete slab with hot water heat. The questions I had about this strategy are one, will there be an issue with compression of the insulation when concrete is poured over the product? And two, will a staple be able to hold the hot water tubing in place?
Rockwool ComfortBoard being installed below a concrete slab. Photo by Travis Brungardt
Continue reading “Construction Design-Using Fibrous Sub-Slab Insulation with In-Floor Heat”
Construction Design-Closed Cell Spray Foam Below a Slab
This post originally appeared on GreenBuildingAdvisor – Green Building Advisor is the one-stop source for builders, remodelers, architects & homeowners looking for expert advice on green products, strategies & proven construction details.
I was introduced to using closed cell spray foam (CCSF) below a slab a few years ago by New England contractor Wade Paquin of WKP Construction. He was insulating the below grade slabs of his new homes by spraying a couple inches over a bed of stone, then pouring the concrete. I have now had the opportunity to try this insulation method over a couple projects, Continue reading “Construction Design-Closed Cell Spray Foam Below a Slab”
Construction Design-Radon
Radon is a naturally occurring soil gas that is present in many locations throughout North America. The gas can’t be seen, smelled, or tasted but it is known to cause lung cancer. Continue reading “Construction Design-Radon”
Construction Design-Building Code Minimum
Not every new home built has the budget to be high performance. That doesn’t mean some energy efficiency measures and decisions based on sound building science can’t be added to a design to build a better house. Continue reading “Construction Design-Building Code Minimum”
Construction Design-Continuous Exterior Insulation
You would think that in my very cold climate of Northern Minnesota, we would be putting as much insulation in our walls and roofs as possible. Not the case. The majority of new homes I blower door test have the code minimum R-21 of wall cavity insulation Continue reading “Construction Design-Continuous Exterior Insulation”
Construction Design-Code Minimum House-Mechanicals
At the time of this writing, construction on the code minimum house is coming to an end. This has been a fun and rewarding project for me because not only was I able to design much of the home, I was also directly involved in the construction. Continue reading “Construction Design-Code Minimum House-Mechanicals”
Construction Design-Randy’s Dream Design
Guess what? I just won the lottery! (Not really, but for the purpose of this blog, let’s pretend.) I’m looking to build myself a new home. I have choices. I could build a McMansion with plenty of space I don’t need and will never use. I could concentrate only on the interior finishes and how the house looks. If you’ve ever read my blog, you already know what direction I’ll take. The house won’t be big, a couple thousand square feet is plenty for me, maybe a rambler with a second story over part of it built on a slab, no basement or crawlspace. Being a BS* guy, I would make an invest in the stuff that is hidden, those pesky control layers I often talk about. It would be based on the Pretty Good House concept. Continue reading “Construction Design-Randy’s Dream Design”
Construction Design-Floor Covering and In-floor Heat
In-floor heat has been a very popular choice for heating systems in my area for the past couple decades. One of my first jobs as an apprentice electrician 25 years ago was plowing electrical heating cable for a basement slab heating system. (I was the mule pulling the plow.) Continue reading “Construction Design-Floor Covering and In-floor Heat”