Every House Needs Roof Overhangs

Posted on April 20,2015 by user-756436 in overhang

Many residential designers pay too little attention to roof overhangs. Roof overhangs have several important functions: they can protect exterior doors, windows, and siding from rain; they can shade windows when solar heat gain is undesirable; and they can help keep basements and crawl spaces dry. A house with improper overhangs can overheat in the summer, can suffer from water entry problems at windows and doors, and can have premature siding rot. The most common design error is to make roof overhangs too stingy. It’s also possible (although much rarer) for roof overhangs to be too wide.

Does Open-Cell Spray Foam Really Rot Roofs?

Posted on April 20,2015 by ab3 in attic

Murmurs and hearsay about open-cell spray foam insulation have been gaining traction for a while. It rots roofs, people have told me. Not long ago, someone even told me that in Florida, roofing companies won't let their workers go up on roofs with open-cell spray foam because the roofs are so spongy, the guys fall right through. Open-cell spray foam is getting a bad reputation among some people in the construction industry. But is it deserved?

Martin’s Ten Rules of Roof Design

Posted on April 20,2015 by user-756436 in attic

Lots of things can go wrong with roofs: bad flashing can cause leaks, a poorly designed valley can turn into a slow-moving glacier, and misplaced gutters can do more harm than good. Experienced roofers see a lot of stupid roofs.

How to Build an Insulated Cathedral Ceiling

Posted on April 20,2015 by user-756436 in cathedral

UPDATED on September 12, 2014 Although the GBA website already contains many articles on the topic, we continue to receive frequent questions about the best way to insulate a cathedral ceiling. It’s therefore time to pull together as much information on the topic as possible and publish it in one place, to clarify the building science issues and code requirements governing insulated sloped roofs.

7 Steps to an Energy-Efficient House: 2. The Roof

Posted on April 20,2015 by Betsy Pettit in deep energy

Editor's introduction: With energy prices rising again, many homeowners are planning energy-efficiency improvements to their homes. But most people are unsure of where to begin, and even seasoned builders don’t always know which priorities should rise to the top of the list. Betsy Pettit, an architect at [Building Science Corporation](, recommends starting where you can get the most bang for the buck. Step 2: To stop air leaks and reduce heat loss, seal up your home's cap

The Perfect Wall, Roof, and Slab — Building Science Podcast

Posted on April 20,2015 by JoeLstiburek in Building Science

_This podcast series is excerpted from a two-day class called_ Building Science Fundamentals _with Drs. Joe Lstiburek and John Straube of Building Science Corporation. For information on attending a live class, go to []( This week Dr. Joe talks about enclosure design principles of energy efficient buildings_

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