Energy-smart details

Closed-Cell Foam between Studs Is a Waste
What really matters is the R-value of the whole wall, not just that of the insulation.
Should I Replace My Old Windows?
Comfort, historical character, and the presence of lead paint may matter as much as cost and energy efficiency.
How Much Insulation Is Too Much?
Martin Holladay shares insights from industry experts about when envelope improvements are a waste of money and how to determine when enough insulation is enough.
Two Ways to Insulate an Old Cape
Cape Cod–style homes can be challenging to insulate; here are two possible solutions.
How to Reduce Heat Loss Through Footings
Pouring a concrete slab on top of a thick layer of rigid foam is an effective way to create a super-insulated foundation.
Insulating Unvented Roof Assemblies
If you plan to insulate a sloped roof, you need to decide if you want a vented or an unvented assembly.
Joe Lstiburek’s Ideal Double-Stud Wall
This wall design ensures good performance and solves the problems of inside and outside moisture.
Adding Insulation to Basement Walls
Learn how to choose and install the best insulation for several types of basement walls (but fix water-entry problems first).
Creating a Sealed Crawlspace
Properly designed unvented crawlspaces have a number of advantages compared to vented crawlspaces.
5 Ways to Insulate a Flat Roof
Learn several reliable ways to build an energy-efficient low-slope or shallow-pitched unvented roof, which is much easier and less risky than building a vented one.

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