Story at a glance:
- A radiant system helped one Portland, Oregon project achieve LEED Gold.
- Windows account for 30 to 50% of a building’s heating and cooling energy loss.
- Ludowici’s terra-cotta tiles are 100% recyclable and free of toxic and synthetic ingredients.
These days there are many green building innovations that go beyond the perhaps more obvious sustainable building materials on architects’ lists, like steel or wood.
Sometimes the most innovative building materials and products are, in fact, quite hidden.
We’ve surveyed the experts for a list of some of the most exciting green building innovations as of late, from products that monitor indoor air quality to ways to heat your building that you may have never considered.
1. Expanded IAQ monitors
Building materials, furnishings, and even products like air fresheners can release pollutants more or less continuously, according to the EPA. Inadequate ventilation is a major contributor to poor IAQ. The EPA reports that if too little outdoor air enters indoors, pollutants can accumulate to levels that can pose health and comfort problems. “Unless buildings are built with special mechanical means of ventilation, those designed and constructed to minimize the amount of outdoor air that can ‘leak’ in and out may have higher indoor pollutant levels,” the EPA says.
Having an advanced indoor air quality monitor can alleviate some of that risk and worry. TSI’s new Q-Trak XP Indoor Air Quality Monitor combines gas and particle measurements with traditional IAQ parameters in one lightweight, handheld instrument that is easy to use, configure, and calibrate in the field.
“The mix-and-match sensors allow IAQ professionals to easily configure the product for each specific project, reducing the need for multiple instruments and downtime in the field,” said Kevin Chase, Global Product Manager for IAQ and Exposure Monitoring products at TSI in a previous article for gb&d.
The Q-Trak XP Indoor Air Quality Monitor is ideal for IAQ surveys and investigations, proactive IAQ monitoring in schools and office buildings, IAQ compliance testing, evaluating thermal comfort, and more.
2. Closed cavity facades
Studies show that overall building energy consumption can be significantly reduced by the use of double-skin and closed cavity facades—by as much as 20% in most climates—relative to the baseline of traditional single skin curtain wall facade.
Derick Koprek at Permasteelisa recently shared with us how a closed cavity facade (a compact double skin facade consisting of single glazing on the outside and a DGU or TGU on the inside), creates a ventilated cavity where blinds can be integrated and a low volume of clean, dry air supplied to the cavity to prevent condensation and dust with the cavity at all times. “This provides the thermal advantage of an exterior operable shading device without the high maintenance costs,” Koprek wrote.
Closed cavity facades offer excellent thermal performance in the transparent areas with U-values in the range of U-0.145 to U-0.15. Other benefits include a high degree of solar protection by the automated blind system, reduced maintenance costs, and top-notch acoustic performance, among other perks.
3. Radiant systems for commercial projects
As architects and designers seek energy-efficient, design-friendly radiant systems, they increasingly recognize the benefits that radiant heating and cooling systems offer.
As far as green building innovations go, radiant solutions have long been popular in Europe, even as they continue to gain steam in the US. Barcol-Air itself has been a large part of the excitement. But some have asked: Can radiant systems be used in a commercial building as the sole sensible heating and cooling system?
The short answer is yes, says Michael O’Rourke at Barcol-Air. He writes in a previous article for gb&d: “Although new buildings with tight envelopes are the best applications, many retrofits have been done over the past 10 to 15 years as older buildings have been updated to allow the use of radiant.”
Examples include the award-winning Edith Green-Wendell Wyatt Federal Building project in Portland, Oregon. The 1970s high-rise steel building wasn’t very energy-efficient, and that was one of the main reasons for its renovation. The building was updated with solar shading on two sides (SE and SW), and the hanging trellis gardens were added on the northwest side. This allowed for plentiful daylight in the space but reduced the overall solar loading to a level where radiant ceiling system was feasible, O’Rourke said. This building renovation, completed in 2013, was awarded a LEED Gold designation.
Barcol-Air manufactures premium radiant heating and cooling systems that deliver optimal comfort using advanced thermal exchange methods. “Radiant can be used for sensible loads—both heating and cooling—and to offset any radiant asymmetry due to cold or hot walls or glass facades in the space,” O’Rourke said in a past interview with gb&d. “But it’s not appropriate for fresh air or dehumidification requirements.”
Therefore, the company offers advanced Active Chilled Beam technology to provide each space with an additional level of ventilation and dehumidification, creating fully integrated heating and cooling operations that positively contribute to LEED accreditation.
Barcol-Air’s Active Beam application offers significant space savings, too, thanks to smaller ductwork requirements. It can be installed tight up against the slab, resulting in reduced floor-to-floor heights and reduced construction costs on new buildings. In addition to low maintenance requirements, Active Beam systems also use the same water temperatures used in radiant panels and exude low noise levels.
4. Fiberglass windows
Windows currently account for anywhere from 30 to 50% of the heating and cooling energy loss in a building, according to Cascadia Windows & Doors Technical Director Michael Bousfield, who recently shared how fiberglass windows impact building performance in an article for gb&d. That means for every dollar spent on heating and cooling, up to 50 cents is lost through the window.
Bousfield says fiberglass is an ideal structural material for window and door frames—specifically fiberglass with a high glass-fiber-to-resin formula. “Nearly 10 times stronger than traditional vinyl, thermoset fiberglass is dimensionally stable, meaning it won’t creep and deflect over time,” he told gb&d. “This stability and strength allow fiberglass frame windows to withstand higher wind load, resulting in larger possible windows—even on tall buildings with high wind loads.”
He says fiberglass also represents less embodied carbon compared to traditional aluminum windows in both sourcing its raw materials and fabrication, carbon draw during its service life, as well as its end of life recycling.
Fiberglass windows are also reported to be impervious to decay, insect attack, and corrosion and can stand up to extreme weather temperatures (-40°F through 350°F and higher) without becoming brittle or soft, giving them a lifespan of 50 to 80 years. “That’s more than four times the lifespan of vinyl/PVC and twice the serviceable lifespan of aluminum windows,” Bousfield wrote.
5. Fabric structures
Innovative architectural fabric structures like those from Shelter-Rite are increasingly being used as an alternative to brick and mortar.
Options run the gamut from air-supported structures to pre-engineered frame structures (with a steel or aluminum frame covered with an architectural membrane) to custom-designed tension structures.
Fabric structures reduce construction and installation time, they are energy-efficient, and can help you keep costs low.
Architectural fabric structures requiring a large interior, wide-open space are known as clear span structures, according to Frank Bradenburg, who previously contributed to gb&d. They do not require internal support columns for reinforcement in the middle of the structure because the high strength architectural fabric only weighs between .15 to .20 pounds per square foot. The clear span width of an architectural fabric structure can range from 50 to 300 feet.
Many structures require the use of a clear span design, including participative sporting facilities for football, soccer, tennis, baseball, and swimming pools; sports stadiums; amphitheaters; airport terminals; rail stations; churches; and other public gathering spots. Industrial applications like warehouses, aircraft hangers, and bulk storage facilities also require a clear span structure.
6. Terra-cotta tile
You can also incorporate architectural terra-cotta tile in a modern way to harness a centuries-old material.
Terra-cotta is green, recyclable, sustainable, durable, low maintenance, and fire-resistant—not to mention that it has had proven success for thousands of years, wrote Rob Wehr of Ludowici in a previous article for gb&d.
Made from the earth and creating zero waste, Ludowici’s terra-cotta tiles are 100% recyclable, energy-efficient, and free of toxic and synthetic ingredients. Their tiles require no chemical cleaning, which protects the environment from harmful runoff, and they also won’t burn. Many non-fire-resistant roofing products require expensive treatments to meet fire codes. With Ludowici tile, extra steps and added costs are eliminated and replaced with peace of mind. All Ludowici products are Class-A fire-rated without special treatment when used in the proper assembly, Wehr said.
The Tyler Arboretum living classroom building, designed by DIGSAU Architects in Pennsylvania, is entirely clad in terra-cotta tiles from Ludowici. “The arboretum was looking for a more natural material that could be incorporated into a natural setting, would last, and would really speak to the purpose,” said Tab Colbert, CEO of Ludowici, in a previous article for gb&d. Colbert said when it came to LEED certifications, roofing hasn’t traditionally been awarded an abundance of points because conventional shingles are an oil-based product. “They never really look at the life of the product,” he said. “We have applications that are 130 years old that are performing great.”
7. Metal wall panels
One quick way to determine a product’s true value is to check out whether it has a Declare Label. You can find a list of products with Declare Labels on the International Living Future Institute (ILFI)’s website. Developed by the ILFI, a Declare Label looks at the product source location, the materials that make up the product, and how the product is treated at the end of its life.
Intercept, a modular metal wall panel system from CENTRIA, is one of many top products with a Declare Label. Intercept provides design versatility by incorporating different substrates, depths, slopes, curves, and perforations into an easy-to-install rainscreen. The flat, rectangular metal wall panel system can be applied over any sort of back-up wall system.
Intercept is 98.6% recyclable, has a 20-year finish warranty, can withstand the life span of the building when following proper maintenance procedures, and is Living Building Challenge compliant.