Aeroseal Rolls Out Air-Sealing Technology for Houses

first_imgAirtight Wall and Roof SheathingPrevent Ice Dams With Air Sealing and InsulationAir Sealing an AtticAir-Sealing Tapes and GasketsQuestions and Answers About Air BarriersOne Air Barrier or Two?Blower Door BasicsGetting the Biggest Bang for Your Air-Sealing BuckPinpointing Leaks With a Fog Machine RELATED ARTICLES California-Builder-Report.pdf Minnesota-report.pdf How much does it costCost is the “golden question,” Springer said. There’s no simple answer and the company doesn’t offer a flat fee.“It’s really project based,” he said. “If you’re starting at 17 ach50 and you want to go to Passive House it’s going to cost more than if you start at 7 ach50 and want to go to Passive House.”Installers would like to have at least a rough idea of where they’re starting before estimating how long the process will take.An AeroBarrier installer monitors progress on a computer screen. The automated system takes a blower-door snapshot every 90 seconds, allowing the installer to reach whatever airtightness goal is specified.“It’s typically priced per square foot, based on volume and different aspects of the project,” he said. “It could cost as little as 90 cents a square foot or as much as $4.50 a square foot. It really depends. You can get it as low as 90 cents to $1.50 a square foot. If you don’t want certified Passive House, we could get you below 1 ach50 for $1.50 a square foot.”That would make the cost of air-sealing to 1 ach50 or below in a hypothetical 2,000-square-foot house about $3,000.One key question for builders is how much of the special sealing tapes, foam, gaskets and other specialized products could be eliminated while still getting the house into the 1 ach50 neighborhood or below. Could AeroBarrier replace all of those specialized products, the ones that cost David Goodyear $4,500?Aeroseal says it is working with the Department of Energy’s Building America program to better understand the optimum time for an AeroBarrier application, and what air-sealing products could be skipped by a builder. But the idea, Springer said, is that any product the builder is using specifically for air-sealing and nothing else could be eliminated.“We could hit point-three ach50 on every install if we really wanted to,” he said. “We’re tying to have an impact on the building industry by helping builders build better houses every time they build, and take the guesswork out of it. At the end of they day, they have to change nothing in the build process, they can insert us for half a day into the process, and we can hit any number they want.” Here’s how it worksAccording to the company, a house can be sealed any time after rough-in, right up until the time occupants move in. It goes something like this:Technicians start by setting up a series of spray nozzles (Aeroseal calls them “emitters”) throughout the house. The brains of the operation is a machine that controls the flow of sealant to the emitters and controls temperature and humidity inside the building. Depending on the size and layout of the space, installers could use between two and 16 emitters.Anything that should not be sealed — bathroom fans, for example — must be protected so they don’t get plugged. The low-VOC, waterborne latex sealant can fill gaps up to 1/2 inch wide.With a blower door running, the emitters start misting the sealant. Installers start with 50 pascals of pressure, the same that would be used for a standard blower-door test, but may ratchet that up to as much as 100 pascals. Installers monitor progress on a computer screen. When the building is tight enough to hit whatever target the installer is looking for, the equipment is turned off. Thirty minutes later workers can re-enter the building and get back to work (Aeroseal says the sealant is GreenGuard Gold certified.) During application, everyone but the installer must clear out.The automated process gives the installer a blower-door readout every 90 seconds. “All the person doing the install has to do is monitor the computer and do what the computer says to do when it tells you to do it,” Springer says. “So, if you just want to hit 3 ach50 so you can close on your house and get a certificate of occupancy, we can hit 3 ach50 on the nose. I’m not guessing if I’m going to hit 3 ach50. I know for a fact I’m hitting 3 ach50.”How long the process takes depends on three key factors: the starting air leakage, the volume of the space that’s being sealed, and the air leakage target. That’s going to vary quite a bit, but the process on a hypothetical single-family house of 2,000 square feet of average construction might take between four and five hours, including setup and cleanup time, according to Springer. Questions from buildersThe process could be a boon for production builders who, in Springer’s words, “are struggling to meet code.” But both durability and redundancy will be issues for builders to weigh — especially owner/builders who plan on long-term occupancy, not just a sale or a certificate of occupancy.Eric Whetzel, who is writing a series of posts about building a 1,500-square foot Passive House near Chicago, estimates he has spent about $15,000 on air-sealing products that he’s installed himself. He wouldn’t even guess how much time he’s put into the effort.“It almost sounds too good to be true,” he said in an email. “If it works, it certainly sounds like a game-changer that could make airtight construction available to even the most green-resistant production builder. Presumably, a builder using this product would be counting on it for all, or nearly all, of their air-sealing, so if it fails over time it could be disastrous for the structure.”Goodyear raised the same concerns. In an email, he said: “The only question I would raise is where is the redundancy? I’m not a huge fan of air-sealing without levels of redundancy built in. Should one component fail, another is there to back it up…So, adding multiple products working together decreases the likelihood of failure should the structure change, which it will over the service lifetime of the building.“It’s a great idea,” he added, “much more cost effective, but the long-term performance is the big question.”There’s also the time factor. In Goodyear’s case, that amounted to more than 23 eight-hour days to reach his airtightness goals.Springer says AeroBarrier could accomplish the same thing in a half-day, and plug leaks that are impossible to see.“The biggest problem is that if you can’t see it you can’t seal it,” he said. “The chance of missing something is still high. The beauty of our technology is that you don’t have to know where it is. Our sealant is going to find it.” For Aeroseal, adapting the duct-sealing technology originally devised at the University of California made sense as building codes and public interest both lined up behind tighter buildings and better energy efficiency.“We thought the technology would make a lot of sense in sealing the whole building envelope, which is typically a pretty difficult thing for builders to do effectively,” Paul Springer, Aeroseal’s manager of business development, said in a telephone call. “We believed that if we could do what we do with Aeroseal on a bigger scale that it would be a great solution for the marketplace.” Experience in the fieldLike the Aeroseal duct-sealing technology, AeroBarrier was originally cooked up at the University of California and has been in development for four years. Last year, Aeroseal did some 500 installations using its own crews, but only this year was the technology made generally available. As a result, Springer said, the company doesn’t have a ton of data on the long-term durability of the sealant.“Our subset of testing in the real world is minimal,” he said.However, Springer says lab tests simulating 50 years of wear show negligible degradation of the sealant over that time. He also offered two Building America reports on the use of AeroBarrier in demonstration projects, one in California, the other in Minnesota. The report on the California testing was written by Curtis Harrington, a professional engineer with the University of California-Davis (where the process was originally invented), and Dave Bohac, a professional engineer at the Center for Energy and Environment.In that field test, AeroBarrier was used to seal four homes in a subdivision in Lodi. Two of the houses were sealed with AeroBarrier after open-cell spray foam had been sprayed at the rim joist and below the roof deck. Here, installers got the houses to an average of 1.09 ach50 at the rough stage of construction (before drywall) with between 1 and 3 hours of sealing time.“There were slight differences in the time required for sealing and the starting leakage rate which is likely due to differences in the floor plan for the homes,” the report says. “The AeroBarrier reduced the leakage in both cases by about 75% bringing them down to 1.11 and 0.95 ACH50, which is roughly 80% below the California requirement of 5 ACH50.”Even before AeroBarrier was applied, these houses were “consistently below code” for airtightness, the report says. “However,” it adds, “it appears that the greatest benefit for the AeroBarrier method would be a possible reduction in overall sealing costs by eliminating many of the current sealing practices.”The two other houses in Lodi were sealed before open-cell foam was installed. These required a little more prep work to get the houses to 4.39 ach50 and 3.47 ach50 respectively before AeroBarrier came into the picture. The AeroBarrier process reduced leakage by about 85%, to 2.15 and 1.43 ach50, the report said. After spray foam was installed, air leakage dropped to 1.25 and 1.06 ach50.“The AeroBarrier installations were all very effective at sealing air leaks in the homes,” the report says. “The average tightness achieved was 1.09 ACH50 which is nearly 80% below the California requirement of 5 ACH50, and this is before drywall is installed in the homes. That is compared to an average tightness of 4.10 ACH50 for homes at the same stage of construction but not treated with AeroBarrier.”AeroBarrier’s website also includes testimonials from Dwell Development in Seattle, and Mandalay Homes a net-zero developer in Arizona that became a beta tester for AeroBarrier and reports consistent blower door results of 0.6 ach50. For 20 years, a company called Aeroseal has been marketing a technique to seal air ducts from the inside with an aerosol mist, eliminating leaks that degrade the performance of HVAC systems and waste energy. Aeroseal now says the same approach can be used to seal whole houses, and offers builders a way of simplifying and speeding up one of the most persnickety details of building a high-performance house.As it is, builders hoping to meet something as stringent as the Passivhaus airtightness requirement or build a net-zero energy house can count on investing many hours in applying acoustical sealant, gaskets, and flashing tape to plug air leaks. Materials alone may run into the thousands of dollars.David Goodyear, for example, says it took 190 man-hours and some $4,500 (Canadian) in materials to meet the Passive House airtightness requirement on the 2,176 square-foot, two-story house he’s building in Flatrock, Newfoundland. Even meeting the much more lenient requirements in model building codes may give some builders a royal headache.Is there a better way? Ohio-based Aeroseal thinks so. After four years of testing and development, it has started marketing an alternative called AeroBarrier, which it says will prove faster, more reliable and potentially cheaper than air-sealing by hand.Like the system used to seal air ducts, AeroBarrier works by forcing an atomized sealant into cracks and crevices under pressure and lets the compound gradually plug up leaks. In a few hours, the company says, a typical single-family house can be sealed tightly enough to satisfy most building code requirements. With a little more time, getting to the Passivhaus requirement — 0.6 air changes per hour under 50 pascals of pressure (0.6 ach50)— is entirely possible.last_img read more

I have seen so much blood that I hate red now: Yuvraj

first_imgAlmost everyone in this world feel that ‘red is the colour of love’ but if you are a certain Yuvraj Singh, then you have more reasons to believe that even ‘shades of grey’ can have a soothing feeling than colour red.Even a year back, Yuvraj would have told you that he loved everything red but not anymore for the man who has successfully battled against a rare germ cell cancer.”Red used to be my favourite colour but I have seen so much of blood that now I hate red. The colour irritates me,” Yuvraj said during an interaction with mediapersons at his cricket academy in Pathways School, Gurgaon recently.As Lance Armstrong would tell you that “It’s Not About the Bike”, Yuvraj now realizes that it’s certainly not about ‘the bat’ anymore.”My approach towards the game has been changed. Of course, it will be the biggest achievement for me whenever I will play my first game for the country (after recovering).”He recalled the hard days during treatment and how it felt being back to normal life.”I struggled to breath earlier. Now I am breathing with both lungs. I can eat samosa. I could smell food during chemo but could not eat it. I am relieved to be able to live like a normal man now,” the 30-year-old said in a pragmatic tone.After initial realization that he has been affected by a dreadful disease, the stylish left-hander did feel that he may not be able to play again.advertisement”I was in bed for 4-6 months and only I can feel what it means to be back on the field. Even I did not imagine that I will be able to play again but my progress has been good. I can’t describe in words, how it felt when I had my first knocking session.”For the past couple of weeks, Yuvraj has time and again expressed his desire to be a part of World T20 Championship but he doesn’t want to rush things.”I am not worried. Obviously, I want to play but I can’t keep thinking about it,” he added.The ‘Man of The Tournament’ during World Cup admitted that initial phase of training was “really painful.””For the first two weeks, every muscle in my body was paining. The body used to be bit shaky but I’m 50-55 per cent there. Rest, I will attain in two months.”I am hitting the ball well. The hand-eye co-ordination is better although the feet movement is slow. The best part is that I don’t get tired now. Hopefully, I will be able to make a comeback in T20 World Cup,” Yuvraj, who is working out for six hours a day, concluded.last_img read more


first_imgWith the Queensland Junior State Cup coming up, South East Queensland affiliates are on the move, preparing their juniors for the biggest event of the year.SEQ will be holding 3 lead up events at:Redlands on the 21st of MayToowoomba on the 11th JuneGold Coast on the 25th JuneThe 3 events are being linked into a Tri-Series (SEQ Junior Tri-Series) format and teams will accumulate points from each event with an eventual overall winner in each division.  The Tri-Series has attracted sponsorship from Delfin (Lend Lease) and great support from TFQ.  There will be some great prizes for the winning teams in each division.For more information and contact details, please read the following brochure: SEQ JUNIOR CUP INFOlast_img read more

Train halts due to tech snag at Konnagar Stn

first_imgKolkata: Passengers had a harrowing time as a Down line local Howrah train stopped at the Konnagar railway station on Thursday evening.According to sources, the local train stopped due to technical snag and triggered panic among the passengers at Konnagar railway station, which is one of the busiest stations. Announcements were made at the station urging the passengers to vacate the train. Railway engineers immediately reach the spot to find the cause of technical snag. However, no loss of life was reported. While the Konnagar railway station is located on the Howrah-Bardhaman main line, it was electrified in 1958. The railway station serves Konnagar Town and has three platforms.last_img read more

Peace River Regional District releases Chief Administration Officer

first_imgUPDATE: We have reached out to Peace River Regional District Board Chair Brad Sperling for comment on Cvik’s release, but our phone calls have not yet been returned.DAWSON CREEK, B.C. – The Peace River Regional District Board has released Chief Administration Officer Chris Cvik.In a one-line statement posted on their website on Friday, the PRRD said they released their CAO without caused on May 18, 2018. Cvik was hired by the District in 2014 to replace Fred Banham who retired that same year.In a press release in 2014, the District said Cvik brought 20 plus years of progressive experience in both the private sector and senior levels of Local Government.last_img read more

V-C, senior officials leave JU campus after 25-hr gherao

first_imgKolkata: After remaining gheraoed for more than 25 hours, Jadavpur University vice-chancellor Suranjan Das and senior administrative officials of the university left the campus late on Tuesday night.The students were agitating, demanding immediate closure of the Centre for Disability Studies in the varsity, alleging misappropriation of funds on the part of those involved in running the Centre since Monday evening. They had earlier placed this demand at the Executive Council (EC) meeting. “The way they have pressed for their demand is undemocratic. I have nothing more to say. I am very tired,” Das said. The university authorities have faced a similar situation five times in the last few months. On February 19, when the students agitated demanding students’ union election, Das was allegedly heckled by a section of students and was hospitalised. He had just joined the university then. Pro vice-chancellor Pradip Ghosh, who also left the campus late on Tuesday night after being gheroaed, said that the authorities have formed a multi-member committee to review activities of all 40 centres under the varsity and also the various schools in it. But the students were bent upon immediate closure of the centre and encroached in front of Aurobindo Bhavan, the administrative building of the varsity. Manojit Mandal, coordinator of the centre and an EC member, said that the project over which a section of students are agitating is translation of an authentic biography of Rabindranath Tagore from Bengali to English. “It has been approved by the university and classes have begun with four students just a week ago. Not an iota of Rs 25 lakh that has been allocated for the project by the state government, has been spent. So how can they allege misappropriation?” Mandal questioned. Meanwhile, the agitating students said that they have lifted their gherao but will continue to press for their demand.last_img read more

Elderly woman sets herself on fire

first_imgKolkata: An elderly woman reportedly committed suicide by setting herself on fire on Monday. The deceased identified as Lakshmi Mondal (90) lived with her grandson’s family at Phoolbagan.According to a source, Mondal lived with her grandson Babul and his family of three for long time in a shanty. It is alleged that Babul along with his wife and son resided in a room while the elderly woman stayed outside the room in an open space. Mondal was reportedly was suffering from acute pain in her waist since long time. On the wee hours of Monday she set herself on fire by pouring kerosene. Babul woke up after he started feeling hot due to the flames and experienced a burning smell. However, he couldn’t do anything as Mondal lied outside the room and was already in flames. Also Read – Bengal family worships Muslim girl as Goddess Durga in Kumari PujaWhen he and other family members screamed for help, the neighbours rushed and poured water on Mondal’s body to put out the flames. Babul’s son informed police about the incident. Police personnel from Phoolbagan police station arrived and recovered Mondal. She was rushed to the NRS Medical College and Hospital. While the doctors were attending her, Mondal reportedly said that she set herself on fire as she couldn’t bear the pain in her waist and back. In the afternoon, she succumbed to her burn injuries. Though no foul play could be detected, the police are investigating the case from all possible angles. An unnatural death case has been registered and no complaint has been lodged against anyone till Tuesday.last_img read more

100 years on… Jallianwala Bagh still bleeds

first_imgAmritsar/ New Delhi: India on Saturday remembered the Jallianwala Bagh massacre victims with Prime Minister Narendra Modi, Vice President M Venkaiah Naidu and Congress chief Rahul Gandhi paying tribute to those killed in the Amritsar tragedy 100 years ago. The massacre took place at Jallianwala Bagh, Amritsar, during the Baisakhi festival on April 13, 1919, when troops of the British Indian Army under the command of Colonel Reginald Dyer opened fire at a crowd of people holding a pro-independence demonstration, leaving several dead and injured. Also Read – India gets first tranche of Swiss bank a/c details”History is not a mere chronicle of events. It shows us the depths to which depraved minds can plunge and cautions us to learn from the past. It also tells us that the power of evil is transient,” said Naidu. Prime Minister Narendra Modi said that the memory of those killed in the Jallianwala Bagh massacre serves as an inspiration to work for an India they would be proud of. “Today, when we observe 100 years of the horrific Jallianwala Bagh massacre, India pays tributes to all those martyred … Their valour and sacrifice will never be forgotten. Their memory inspires us to work even harder to build an India they would be proud of,” he tweeted. Also Read – Tourists to be allowed in J&K from ThursdayCongress president Rahul Gandhi paid floral tributes at the Jallianwala Bagh Memorial and said the cost of freedom must never be forgotten. He was accompanied by Punjab Chief Minister Amarinder Singh, state minister Navjot Singh Sidhu and some other Congress leaders. They also observed a two-minute silence to remember those who were massacred in the tragic incident on April 13, 1919. “The cost of freedom must never ever be forgotten. We salute the people of India who gave everything they had for it,” the Congress chief wrote in the visitors’ book. British High Commissioner to India Dominic Asquith also visited the Jallianwala Bagh Memorial separately and laid a wreath there. In the visitors’ book, Asquith wrote, “The events of Jallianwala Bagh 100 years ago today reflect a shameful act in British Indian history. We deeply regret what happened and the suffering caused.” He also wrote, “I am pleased today that the UK and India have and remain committed to developing further a thriving 21st century partnership.” In his brief interaction with reporters later, Asquith noted British Prime Minister Theresa May on Wednesday described the Jallianwala Bagh massacre as a “shameful scar” on British Indian history. May, however, had stopped short of offering a formal apology. Asked why an apology was not tendered by the British government, Asquith said, “I know this is a really important question. I would just ask you to respect what I came here to do, which is to commemorate those who died a hundred years ago and to express the sorrow of the British government and of the British people.”last_img read more

2 killed as truck rams into car on Yamuna Expressway

first_imgGreater Noida: In yet another tragic road accident at Yamuna Expressway, two women aged 32 and 14 years were killed after a speeding truck rammed into their SUV car from behind in Rabupura area of Greater Noida on Yamuna Expressway.Cops said that the other three passengers of the car, including two minor kids, sustained injuries and they have been admitted to the hospital. The truck driver was also severely injured and he has been kept under Intense Care Unit (ICU) of the hospital. Also Read – Odd-Even: CM seeks transport dept’s views on exemption to women, two wheelers, CNG vehiclesAccording to police, the incident occurred around 1:30 am on Friday. Among the victims, Beena (32) and her niece Rekha (14) have died while her husband Bhagwan Singh (40) and two kids Pragyan (4)and Tanvi (6) were injured in the incident. The truck driver was identified as Pappu (38) who was also critically injured. Ashok Venkatesh, Assistant Superintendent of Police (ASP) and Station House Officer of Rabupura police station said that the family was travelling from Alvar district in Rajasthan towards Delhi. Also Read – More good air days in Delhi due to Centre’s steps: Javadekar”Six members of a family were travelling in a XUV 500 car towards Delhi when a speeding truck, ferrying Mangoes from Andhra Pradesh to Azadpur market in Delhi, rammed into their car from behind and later overturned on the car after losing control. All the occupants of the car including the truck driver were critically injured and police acted on an information conveyed by a passerby. Highway patrolling police along with a team from Rabupura police station rushed to the spot while cutters were used to pull out victims from the mangled car. The victims were rushed to Kailash hospital where Beena and Rekha were declared brought dead while other have been admitted to the hospital. The bodies of deceased have been handed over to the family after getting the post mortem done,” said Venkatesh. “Prima Facie it appears that the truck driver might have dozed off and he failed to notice the vehicle. The truck was also loaded which made the driver lose his control and it overturned and collapsed on the car,” added Venkatesh. Meanwhile police have lodged a case into the matter. “Based on the complaint filed from one of victim’s family an FIR under sections 304 A (death by negligence), 279 (Rash Driving), 337 (Causing hurt by act endangering life or personal safety of others) and 427 (mischief) of the Indian Penal Code (IPC) has been registered while further investigations are underway,” the officer said. Rajesh Meena, injured Bhagwan Singh’s brother, told Millennium Post that the family was returning from a marriage that happened on May 7. “My elder brother Bhagwan Singh, who works at MCD in New Delhi was returning from a marriage of a close relative. They had left Alwar around 8 pm on Thursday while the incident occurred around 1:30 am,” said Rajesh.last_img read more

Disappointed by Pakistan bowling again: Akhtar

first_imgLondon: Former Pakistan tearaway quick Shoaib Akhtar expressed his disappointment with the team’s botched effort to defend 340 against England in the fourth ODI, saying he was not impressed with the bowling. “Another failed attempt to defend a 300+ total by Pakistan and the series loss. Disappointed by the bowling again,” Akhtar tweeted after the game. Pakistan put up 340/7 riding Babaz Azam’s 115 and half century by Mohammad Hafeez. However, their bowlers failed to defend the total even after reducing England to 216/5 at one stage, when Joe Root, Jos Buttler and Moeen Ali were dismissed in quick succession, a collapse of 4 for 15. It was Ben Stokes who then scored an unbeaten 71 off 64 balls to guide England home as Pakistan bowlers suddenly lost the plot. In the third rubber too, Pakistan had failed to defend 359. England have an insurmountable 3-0 series lead. The final ODI takes place in Leeds on Sunday.last_img read more