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For Home Heating, Build Up—Not Out

These days, it’s hot enough up here in Vermont that a person could forget what the winters are like. But make no mistake: winter will come, and when it does, the energy efficiency of your home will once again be a major concern.

Building a house? Moving into a new place? If you’re thinking about whether a one- or two-story house will be the best fit for your family, you’ll probably want to know which setup will use your heat energy more effectively. Based on that criteria, your best bet will actually be the two-story job.

Rob Roy explains. (With numbers!)

The following is an excerpt from Mortgage Free! Innovative Strategies for Debt-free Home Ownership, Second Edition by Rob Roy. It has been adapted for the Web.

Heat Loss Comparison of One- and Two-Story Design

For the sake of easy figuring, we’ll compare a simple 32-foot-square one-story design with a 32-foot-square two-story design, each built on a floating slab. Each story has 9-foot-high walls, and the stairwell space eats up 48 square feet on each floor, so 96 SF of useful floor area is lost to the need of accessing the second story.

Skin area, single-story home       Skin area, two-story home
Slab 32′ × 32′ = 1,024 SF       Slab 32′ × 32′ = 1,024 SF
Walls 128 PF × 9′ = 1,152 SF       1st story walls 128 PF × 9′ = 1,152 SF
Roof 32′ × 32′ = 1,024 SF       2nd story walls 128 PF × 9′ = 1,152 SF
          Roof 32′ × 32′ = 1,024 SF
Total skin area =3,200 SF       Total Skin Area 4,352 SF

 

Floor area, single-story home       Floor area, two-story home
Floor area 32′ × 32′ = 1,024 SF       1st floor area 32′ × 32′ = 1,024 SF
          2nd floor area 32′ × 32′ = 1,024 SF
          Less 96 SF lost in stairwell -96 SF
          Floor area = 1,952 SF

Gain in skin area with two-story house: 4,352 SF – 3,200 SF = 1,152 SF
Percentage gain in skin area: 1,152 SF ÷ 3,200 SF = 36 percent
Gain in useful floor area with two stories: 1,952 SF – 1,024 SF = 928 SF
Percentage gain in floor area: 928 SF ÷ 1,024 SF = 91 percent

Bottom line: Adding the second story increases usable floor space by 91 percent with only 36 percent more skin area. And that’s not all. Warm air rises. We may as well use it twice before it leaves us. If the primary heat source warms the air in the lower story, we can use the heat again upstairs. Strategic placement and use of floor registers, internal doors, and the stairwell itself will allow passive delivery of this heat, and the effect can be controlled further with a simple fan in the ceiling of the first story.


New French edition of The Resilient Farm and Homestead available

Great news for French-speaking fans of Ben Falk’s The Resilient Farm and Homestead: An Innovative Permaculture and Whole Systems Design Approach. The French language translation is now available from Imagine Un Colibri, from French booksellers, and on Amazon.fr. Falk’s book is a technical manual that details the strategies he and his team have developed for […] Read More

Prepare! Keep a Grab-n-Go Survival Kit Handy

Are you prepared in the event of a sudden emergency? Blizzard, earthquake, insurrection after the inauguration? We know a lot of people are wondering what’s coming next in the US, as well as the world, given terrorism, politics, and global warming, among other threats. In this excerpt from When Technology Fails, a popular book on […] Read More

A Bloggin’ We Shall Go: Your Favorite Blog Posts from 2016

Ah, 2016 – where did the time fly? It seems like only earlier this year we were excited about designing swales and getting to know more about no-till farming, and we ended up focusing on the heart, ketogenic diets and seeking a bio-abundant future. While the top 7 blog posts of the year don’t exactly […] Read More

Yes, America We Can Make It … Really

Uncertainty got you down? The political world may seem like it’s crumbling around us, but this we know: We can make it, America. Literally, we can make things. Houses. Gardens. Food. Below we’ve selected some of our classic how-to and DIY books (and some new favorites) to help you sustain your self, family, and community. […] Read More

Chelsea Green on Instagram: Our Most Popular Photos of 2016

What a year for Chelsea Green on Instagram! We began the year with 500 followers and are now fast approaching 4,000 photo-loving brewers, gardeners, cheesemakers, permaculturists, foodies, seed-savers, homesteaders, foragers, and more. Our most popular posts of 2016 say a lot about what makes you happy: mushrooms, innovative garden designs and techniques, tiny cabins, and […] Read More
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