Vapor Barrier Permeance Calculator
A wall cavity is full of temperature and air pressure gradients pulling water around, so a vapor barrier isn’t as …
Mike Lee
Room Volume Calculator
Look around the room. Look up. Now imagine yourself standing in the middle of it: the ceiling’s high, maybe vaulted, …
Floor Area From Dimensions Calculator
When we start with a goal (new floor) and a tape measure, sometimes we finds ourselves staring at confusing formulas …
Air Purifier ACH Calculator
Why did you buy an air purifier? Because you wanted clean air. So you read the box, saw that big …
Frost Point Calculator
What’s frost? Frost is white ice that appears on objects like your windshield. It forms when water vapor turn directly …
Attic Insulation Depth Calculator
It’s July. You head to the attic to survey for pests, and discover compressed fiberglass, which sends heat downward into …
SHGC Heat Gain Calculator
Even if your air conditioning isn’t broken, you probably know that windows is also a major source of heat entering …
Wall Insulation R Value Calculator
We spend money insulating the stuff within our walls’ frame, and forget about wood that holds it all up. Why? …
Infiltration Rate Calculator
That’s why a tight house is less about caulking and weather stripping than about airflow in and out of your …
Crawl Space Ventilation Calculator
Crawl spaces are like the attic of your home; you tend to forget about them but the dirt floor under …