The most recent blogs at Green Building Advisor

Ontario Imposes Tougher Ventilation Requirements

Posted on January 11, 2017 by user-1072052 in Guest Blogs

Ontario, Canada's most populous province, will increase the energy performance of homes by 15% starting in 2017. The changes are required under the province's updated building code known as SB-12. The two biggest changes are complementary: All new homes must have heat-recovery on their ventilation systems while incentives will be put in place for making buildings more airtight as verified by air leakage testing.

Accounting for Renewable Electricity Savings

Posted on January 10, 2017 by Anonymous in Guest Blogs

By ROBIN ROY

How much does it matter if energy efficiency programs like Energy StarLabeling system sponsored by the Environmental Protection Agency and the US Department of Energy for labeling the most energy-efficient products on the market; applies to a wide range of products, from computers and office equipment to refrigerators and air conditioners. or appliance energy standards save electricity generated by renewable resources like wind and solar, rather than from fossil fuel power plants? Certainly from the perspective of reducing carbon pollution, there’s a strong case that saving renewable electricity is not as valuable as saving energy generated from burning fossil fuels.

As the role of renewable electricity in the nation’s electricity supply grows, this question will become increasingly important to think through.

Toronto Passive: Designing a High-Performance Home

Posted on January 9, 2017 by Hove in Guest Blogs

Editor's Note: Lyndon Than is a professional engineer and Certified Passive HouseA residential building construction standard requiring very low levels of air leakage, very high levels of insulation, and windows with a very low U-factor. Developed in the early 1990s by Bo Adamson and Wolfgang Feist, the standard is now promoted by the Passivhaus Institut in Darmstadt, Germany. To meet the standard, a home must have an infiltration rate no greater than 0.60 AC/H @ 50 pascals, a maximum annual heating energy use of 15 kWh per square meter (4,755 Btu per square foot), a maximum annual cooling energy use of 15 kWh per square meter (1.39 kWh per square foot), and maximum source energy use for all purposes of 120 kWh per square meter (11.1 kWh per square foot). The standard recommends, but does not require, a maximum design heating load of 10 W per square meter and windows with a maximum U-factor of 0.14. The Passivhaus standard was developed for buildings in central and northern Europe; efforts are underway to clarify the best techniques to achieve the standard for buildings in hot climates. Consultant who took a year off from work to design and build a home with his wife Phi in North York, a district of Toronto, Ontario. This is the first in a series of posts about the project, beginning with the start of construction in early 2012. Than describes the process in his blog, Passive House Toronto.

Windwashing in Exterior Mineral Wool

Posted on January 6, 2017 by user-756436 in Musings of an Energy Nerd

Fibrous insulation materials like mineral wool do not stop air flow. Unlike rigid foam (which is a pretty good air barrierBuilding assembly components that work as a system to restrict air flow through the building envelope. Air barriers may or may not act as a vapor barrier. The air barrier can be on the exterior, the interior of the assembly, or both., as long as the seams between panels are taped), mineral wool can only slow down air flow, not stop it.

So what happens when builders install mineral wool insulation on the exterior side of wall 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. ? Is the thermal performance of the mineral wool degraded by wind?

Setting the PACE for Consumer Protection

Posted on January 5, 2017 by k_vaughn in Guest Blogs

Residential PACE (property assessed clean energy), an innovative solution for financing energy efficiency and renewable energy projects, is being ledLight-emitting diode. Illumination technology that produces light by running electrical current through a semiconductor diode. LED lamps are much longer lasting and much more energy efficient than incandescent lamps; unlike fluorescent lamps, LED lamps do not contain mercury and can be readily dimmed. by a set of industry mavens seeking to realize the promise of this public–private partnership. Specifically, industry stakeholders have come together to create a set of consumer protection standards that ensure that homeowners reap the full benefits of PACE while safeguarding against predatory behavior in this nascent market.

The Fundamentals of Rigid Duct Design

Posted on January 4, 2017 by ab3 in Building Science

At the end of this month, I'm giving a little presentation at the ASHRAEAmerican Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE). International organization dedicated to the advancement of heating, ventilation, air conditioning, and refrigeration through research, standards writing, publishing, and continuing education. Membership is open to anyone in the HVAC&R field; the organization has about 50,000 members. conference in Las Vegas. Actually, I'm doing one third of the whole presentation, which is titled Flex Ducts, Hard Ducts and No Ducts: Migration Patterns for Duct Hunters (or not) in the Land of Thermal Comfort. My part is on hard ducts.

Chris VanRite is doing flex duct, and Robert Bean will cover the no-ducts part (which doesn't refer to ductless minisplits but rather to hydronic distribution). We get 15 minutes each, so I'll elaborate on my part a bit here.

Can We Rely on DIY Air Pollution Sensors?

Posted on January 3, 2017 by Anonymous in Guest Blogs

By RICHARD PELTIER

Until recently, measuring air pollution was a task that could be performed only by trained scientists using very sophisticated — and very expensive — equipment. That has changed with the rapid growth of small, inexpensive sensors that can be assembled by almost anyone. But an important question remains: Do these instruments measure what users think they are measuring?

Indoor Condensation Plagues This Chicago Home

Posted on January 2, 2017 by ScottG in Q&A Spotlight

Pat Andersen and her husband have been diligent about energy upgrades and maintenance on their 33-year-old Chicago home. They've sealed air leaks in the attic floor, replaced leaky windows, and checked the airtightness of the house with a blower-door testTest used to determine a home’s airtightness: a powerful fan is mounted in an exterior door opening and used to pressurize or depressurize the house. By measuring the force needed to maintain a certain pressure difference, a measure of the home’s airtightness can be determined. Operating the blower door also exaggerates air leakage and permits a weatherization contractor to find and seal those leakage areas..

But one problem remains: condensation in the form or water droplets or frost on some ceilings on the second floor. Andersen would love to find a solution.

R-Value Scammers Sued By the FTC

Posted on December 30, 2016 by user-756436 in Musings of an Energy Nerd

Here at GBAGreenBuildingAdvisor.com, we received our first inquiry concerning Insultex housewrap on July 31, 2015, when Marcus Sheffer questioned the validity of Insultex’s R-valueMeasure of resistance to heat flow; the higher the R-value, the lower the heat loss. The inverse of U-factor. claims.

Insultex is a plastic housewrap distributed by Innovative Designs of Pittsburgh, Pennsylvania. The company offers two versions of its housewrap, at a price that is from two to nine times higher than the price of ordinary housewrap. One version is 1 mm (0.0384 inch) thick; according to Innovative Designs, this product has an R-rating of R-3. That’s R-78 per inch.

Wolfe Island Passive: Adding the Insulation

Posted on December 29, 2016 by DMWood in Guest Blogs

Editor's note: David and Kayo Murakami Wood are building what they hope will be Ontario's first certified Passive HouseA residential building construction standard requiring very low levels of air leakage, very high levels of insulation, and windows with a very low U-factor. Developed in the early 1990s by Bo Adamson and Wolfgang Feist, the standard is now promoted by the Passivhaus Institut in Darmstadt, Germany. To meet the standard, a home must have an infiltration rate no greater than 0.60 AC/H @ 50 pascals, a maximum annual heating energy use of 15 kWh per square meter (4,755 Btu per square foot), a maximum annual cooling energy use of 15 kWh per square meter (1.39 kWh per square foot), and maximum source energy use for all purposes of 120 kWh per square meter (11.1 kWh per square foot). The standard recommends, but does not require, a maximum design heating load of 10 W per square meter and windows with a maximum U-factor of 0.14. The Passivhaus standard was developed for buildings in central and northern Europe; efforts are underway to clarify the best techniques to achieve the standard for buildings in hot climates. on Wolfe Island, the largest of the Thousand Islands on the St. Lawrence River. They are documenting their work at their blog, Wolfe Island Passive House. For a list of earlier posts in this series, see the sidebar below.

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