As part of a new Master Certified Green Professional designation, NAHB worked with GreenBuildingAdvisor to develop a rigorous training course covering green home building, full of building science and quality construction details. This course premiered at the International Builders Show in Las Vegas just last week.
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Our latest Question of the Week comes from a homeowner in New Jersey. Monica is uncertain of the best way to insulate the roof of a new second-story addition on her Cape Cod home. She wonders whether it’s wise to insulate directly under the roof sheathingMaterial, usually plywood or oriented strand board (OSB), but sometimes wooden boards, installed on the exterior of wall studs, rafters, or roof trusses; siding or roofing installed on the sheathing—sometimes over strapping to create a rainscreen.
— especially since the mounting system for her photovoltaic(PV) Generation of electricity directly from sunlight. A photovoltaic cell has no moving parts; electrons are energized by sunlight and result in current flow. array requires 54 holes to be drilled in her asphalt shingle roof.
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Powerful kitchen exhaust fans do a good job of removing cooking odors and smoke. They also have the potential to depressurize a house, causing water heaters to backdraft and pulling ashes out of the fireplace and onto the hearth.
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When northern builders see icicles, they think “ice dam.” Heat from the living space leaks into the attic and melts snow on the roof; the water runs down the roof until it gets to the colder eave, where it freezes. When water backs up behind the ice dam at the eave, it can get under the shingles and leak into the interior.
In the north, icicles are often a sign of trouble.
In New Orleans, however, there is usually no snow to melt. Icicles coming out of a roof here represent something different. But they are still trouble.
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New World Homes offers traditional house styles that combine off-site building with high-level performance.
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This podcast series is excerpted from a two-day class called “Building Science Fundamentals” taught by Dr. Joe Lstiburek and Dr. John Straube, of Building Science Corporation.
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This podcast series is excerpted from a two-day class called “Building Science Fundamentals” taught by Dr. Joe Lstiburek and Dr. John Straube, of Building Science Corporation.
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Clayton Homes CEO Kevin Clayton gave the company architect carte blanche to design something new, novel, and green to attract a new niche of buyers to the company’s products. Within three months, the first prototype i-house was finished and furnished with an Ikea sensibility. Small and reminiscent in shape of early mobile homes, the i-house is tricked out with contemporary looks and energy- and earth-saving features.
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Tweet ThisNew Hampshire Builder Uses Factory-Built and High-Performance Building Componets to Construct Energy-Efficient Homes.
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Tweet ThisThe key factors to understand when judging the expected performance of a window or door are:
- Solar Heat Gain Coefficient (SHGC)
- Visible Light Transmission (Vt)
- U-Value (U-Value)
These are the standards by which most test protocols evaluate glazing from.
Solar Heat Gain Coefficient (SHGC) -- is the measure of relative heat gain (compared to a piece of 1/8″ thick clear glass) that a particular piece of glass will absorb under exposure to the sun. Reducing the Solar Heat Gain Coefficient (SHGC) is a function of either tinting the glass and making it darker or coating the glass with low-emissivity coatings to reflect the amount of infrared spectrum most responsible for heating that the glass absorbs.
Visible Light Transmission (Vt) -- is a measure of the amount of total visible light that will pass through the glass, again relative to a piece of 1/8″ thick clear glass. Adding low-emissivity coatings coatings to glass will affect the Visible Light Transmission (Vt) factor pretty dramatically depending on the specific glass manufacturer’s method of coating.
U-Value (U-Value) -- is a calculated measure designed to represent the ability of the assembly (both pieces of glass, the air space, the frame components, etc.) to resist the transmission of cold and heat through them. This is a composite value of all the components and is not a relative measure. The lower the U-Value, the better able the assembly is capable to resist the passage of heat and cold. U-Value is the inverse of R-Value in measuring the same physical characteristics and thus the higher the R-Value, the better able to resist the passage of heat and cold.
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