Start Free Trial Already a member? Log in Sign up for a free trial and get instant access to this article as well as GBA’s complete library of premium articles and construction details. This article is only available to GBA Prime Members UPDATED on June 24, 2018 with new product informationTwenty years ago, very few residential builders knew what a rainscreen was. These days, however, it’s no longer unusual to see siding being installed on vertical furring strips or a plastic drainage mat. As rainscreens become more common, mainstream builders are beginning to ask, “What’s a rainscreen? How do I know if I need one?”This article will pull together information to answer the most common questions about rainscreen gaps between siding and sheathing.You can’t really point to a rainscreen, because it isn’t a thing — it’s a system. That’s why I prefer to talk about a “rainscreen installation,” a “rainscreen approach,” or a “rainscreen gap.”For most residential builders, a rainscreen siding installation is one that includes an air gap between the siding and the water-resistive barrier (the asphalt felt or housewrap).Some purists insist that you can’t call it a rainscreen gap unless you have ventilation gaps at the top of the wall as well as the bottom of the wall. If it only has drainage gaps at the bottom, but no openings at the top, the purists insist that the system is more accurately called a “cavity wall.”However, the distinction between a cavity wall and a rainscreen wall isn’t particularly useful — in part because the distinction is based on a faulty understanding of “pressure equalization” principles — so I side with those who use the word “rainscreen” for either type of wall.Every well-designed rainscreen wall needs:Ventilation openings at the top of the wall are optional.Rainscreen gaps help walls manage moisture. A rainscreen gap helps to dry the sheathing, which may accumulate moisture during cold weather. It also helps to dry the siding when it is soaked by rain.These…
The role and responsibilities of spray foam contractorsIf I were a spray polyurethane foam (SPF) insulation contractor, I’d do like they all do and make sure that every potential customer I talked to knew about SPF’s air sealing qualities. (I would not, however, try to sell people on fantasy R-values of 20 or 40 per inch, which I have known some SPF contractors to do.) RELATED ARTICLES Designing a Good Ventilation System GBA Encyclopedia: Ventilation ChoicesAre HRVs Cost-Effective?HRV or ERV?Ventilation Rates and Human HealthHow Much Fresh Air Does Your Home Need?Questions and Answers About Air BarriersSpray Foam Insulation Is Not a Magic Bullet Then I’d do what not nearly enough spray foam contractors do: I’d tell all my customers they need to install a mechanical ventilation system in every new home with spray foam. In fact, I’d include mechanical ventilation as one of the things I sell. (Maybe that’s just because I’d rather be an HVAC contractor, though.)If a client didn’t want me to do the ventilation, I’d have them sign a liability waiver acknowledging that they have been informed about the importance of mechanical ventilation in airtight homes. Then I’d have that piece of paper so I could pull it out if the homeowner ever came after me for poor indoor air quality.I’m not the only one saying that ventilation needs to be part of new homes with spray foam insulation. Recently, Mac Sheldon of Demilec emailed me about this issue and wrote, “I’m telling… preaching… admonishing… SPF contractors to never pull the trigger on a spray foam job until there’s a ventilation plan in place.”I believe that spray foam insulation can be an effective product to use in building enclosures. I also know that spray foam can be done poorly. No matter which way it’s done, however, mechanical ventilation is not optional in airtight homes. I wonder how many spray foam contractors will find that out the hard way. Most installations of spray foam insulation, when properly installed, act as an air barrier. When you use it instead of the fluffy stuff (fiberglass, cellulose, cotton), a house will be more airtight. That’s good.When a house is airtight, the nasties in the indoor air tend to stick around. Volatile organic compounds (VOCs), water vapor, odors, radon, and other stuff you don’t want to immerse yourself in make the home’s indoor air quality worse.How do you solve this problem? Mechanical ventilation. Well, source reduction and separation would come first, but airtight homes need mechanical ventilation. Allison Bailes of Decatur, Georgia, is a speaker, writer, energy consultant, RESNET-certified trainer, and the author of the Energy Vanguard Blog. Check out his in-depth course, Mastering Building Science at Heatspring Learning Institute, and follow him on Twitter at @EnergyVanguard.
Defending champion and top seed Novak Djokovic moved a step closer to a fifth title at Indian Wells with a 7-6(5), 6-2 victory over long-time rival Rafael Nadal in the semi-finals of the BNP Paribas Open in California on Saturday.Djokovic and Nadal treated the fans to several compelling rallies at the sun-baked Indian Wells Tennis Garden but the Serb, for the most part, held the upper hand and broke his opponent twice in the second set to secure victory.After a protracted encounter that lasted nearly two hours, Australian Open champion Djokovic booked his place in Sunday’s final where he will meet Canadian Milos Raonic, a 6-3, 3-6, 6-3 winner against Belgian David Goffin.”There were things that I could have done better but I finished off the match very well and I am very pleased to get through to the final,” Djokovic told ESPN in a courtside interview after improving his record against Nadal to 25-23.”The first set was very close and decided by one or two points in a tiebreaker and I was just fortunate to get through that one.”The second was back and forth and midway through I managed to make that crucial break that allowed me to start playing more aggressive. Overall, it was a tough match but that is what you expect when you play Rafa.”Breaks of serve were traded in the second and third games of an eagerly awaited showdown, before Nadal later squandered a set point in the 10th game when he netted a forehand.advertisementThough the Spaniard came from 2-5 down in the tiebreak to level at 5-5, Djokovic edged ahead 6-5 after a strong first serve before clinching the set after a little more than an hour when his opponent netted a backhand.Nadal came under increasing pressure to hold serve in the second set as Djokovic dominated their baseline exchanges and the Spanish left-hander finally cracked in the sixth game when he dumped another forehand into the net to trail 2-4.Serving at 2-5, Nadal clawed his way back from 0-40 and saved five match points in all before another tired shot from the baseline sailed long to hand victory to Djokovic.Earlier, big-serving Raonic overcame a second-set wobble against the 15th-seeded Goffin to reach his third ATP Masters 1000 final.”I lost my way a little bit (in the second set), I got into his rhythm,” the towering Raonic said after sealing victory in two hours to improve his record for the year to 14-1.”But I really went for it in the third set and it came together. The most important thing for me was to stick to my identity and it was great to play here in my second (successive) semi-final and make the most of it.”
Eds: Repeating after making changes in para 2 New Delhi, Aug 15 (PTI) BCCI acting president C K Khanna today met Indian Olympic Association secretary general Rajeev Mehta to wish the country’s contingent for the Asian Games in Indonesia, starting Saturday. Mehta presented Khanna a shirt of the Indian contingent at the IOA Bhawan here. “Mr. C K Khanna wanted to wish luck to the Indian contingent, to produce a strong performance in Indonesia and bring back a rich haul of medals. It was a very nice gesture,” Mehta said. “This is the first time the head of BCCI came to IOA office and wish luck for the country’s performance. Mr. Khanna said the BCCI would be happy to extend help in the development of India sports.” PTI PDSAHPDS
Liverpool ace Mane: Klopp no chokerby Paul Vegas9 months agoSend to a friendShare the loveLiverpool ace Sadio Mane insists manager Jurgen Klopp is no “choker”.Pressure is building on Klopp to win his first piece of silverware at Anfield, following last season’s Champions League final loss to Real Madrid.Despite winning successive Bundesliga titles with Borussia Dortmund in 2011 and 2012, the German, 51, has been on the receiving end of rival fans’ taunts and accused of being a serial choker after losing his last SIX major finals.He was in charge of Liverpool’s 3-1 Europa League final defeat to Sevilla three years ago — and the League Cup penalty shootout loss to Manchester City in the same season.But Mane hit back: “He is a great coach, not a choker.“He has won titles before and he has lost titles. That is life. Sometimes you win, sometimes you lose.” About the authorPaul VegasShare the loveHave your say
TAMPA, FL – SEPTEMBER 22: The mascot from the University of South Florida Bulls entertains during play against the North Carolina Tar Heels at Raymond James Stadium on September 22, 2007 in Tampa, Florida. USF won 37-10. (Photo by Al Messerschmidt/Getty Images) *** Local Caption ***After averaging just over 17 points a game last season, USF opened its 2015 campaign by splashing 51 points on the board against the FAMU rattlers on the way to a 51-3 victory. The Bulls only scored a combined 206 points all of last season, so there was reason to celebrate. But it’s not every day a team gets to celebrate in the locker room with a famous rapper.USF freshman defensive end Vincent Jackson posted a video to his Twitter account after the win of rapper Plies with his arm around head coach Willie Taggart, giving him the seal of approval. The homie @plies in the locker room after the W #GoBulls pic.twitter.com/ldcHhc2QuJ— Vincent Jackson Jr. (@VMJacksonJr) September 6, 2015Not exactly what you’d expect in the locker room after a season opening victory, but maybe the Bulls are on to something. Plies seems pretty confident that USF will be “bustin’ the scoreboard every Saturday,” but a much bigger challenge lies ahead in Tallahassee next weekend as the Bulls are set to face the Seminoles.
However, being a playoff contender seems a little ambitious. Orlovsky is right that Nebraska’s schedule is quite manageable, but in order to make the playoff, they’d have to go at least 11-1 in the regular season.That doesn’t seem likely when you consider the Huskers have to face Ohio State and the Big Ten West is projected to be a highly-competitive division with multiple teams capable of winning it. Not to mention, if Nebraska did win the West, they’d then have to beat the Big Ten East champion in the conference title game.We wouldn’t be surprised if the Huskers contend for the CFP under Frost at some point, just not this fall. LINCOLN, NE – OCTOBER 27: Head coach Scott Frost of the Nebraska Cornhuskers leads the team on the field before the game against the Bethune Cookman Wildcats at Memorial Stadium on October 27, 2018 in Lincoln, Nebraska. (Photo by Steven Branscombe/Getty Images)Nebraska football is garnering considerable hype heading into the 2019 season. Multiple pundits have pegged the Cornhuskers as Big Ten West favorites.ESPN’s Dan Orlovsky is going just a bit further. In an appearance on Get Up! this morning, Orlovsky called Nebraska a potential College Football Playoff contender.Here’s why he feels that way, via 247Sports:“Give me the frosted tips of the Nebraska Cornhuskers, they’re back,” Orlovsky said.“They started 0-6 last year, but in that start, they had four really close games that ended up being losses. Their quarterback, Adrian Martinez, should be on the short list for the Heisman Trophy, 2,400 yards passing, 800 rushing. They got six starters back on defense.“And guys — I don’t find a tough game on their schedule on the road. Ohio State comes to them, Iowa comes to them, Wisconsin comes to them. Folks, Nebraska can be a national College Football Playoff contender.”Now, we’re buying into the Huskers making strides this year. Despite going 4-8 in 2018, Nebraska is ranked 21st in The Spun’s preseason Top 25.
A proposal to declare Tripaitaka a world heritage was handed over to the UN by President Maithripala Sirisena today.The proposal was handed over at an event held at the Temple of the Tooth in Kandy. The Tripitaka contains the teachings of the Load Buddha made over 2300 years ago.The Tripitaka contains three volumes as Suthra, Vinaya and Abhidarma.
According to the UN Office for the Coordination of Humanitarian Affairs (OCHA), the fighting between rebels from the Liberians United for Reconciliation and Democracy (LURD) and Government forces – which this week spread from western to central Liberia – has sparked a new wave of displacement that could overcrowd camps and outstrip food supplies.Over the past week, as fighting in the region intensified, residents of Gbarnga, the provincial capital of Bong County and its surrounding areas, have been fleeing southwards to Monrovia and Totota. Others fled towards the town of Ganta on the border with Guinea. The road between Ganta and Gbarnga is now cut off and the UN agencies voiced concern whether food, water, health and medical supplies can be stretched to meet the needs of the rapidly increasing number of internally displaced persons (IDPs).While existing facilities may still be adequate to absorb the new influx, UN aid agencies fear overcrowding in the camps could lead to heightened public health risk, OCHA said. Another critical issue is that food aid stocks are being depleted quickly – a break in the pipeline is anticipated in April for pulses and for cereals in May – unless resources are found to cover the needs ahead of upcoming shipments.
“Emergencies come and go, but we are now in an acute phase of a chronic problem and the effects of this are going to be with us for generations to come,” said James Morris, the UN Special Envoy for Humanitarian Needs in Southern Africa, who is in the region on an 11-day, four-nation assessment mission along with Ann Veneman, Executive Director of the UN Children’s Fund (UNICEF).”This is not about one issue or one country. Many factors are converging to undermine livelihoods of millions of people in southern Africa,” said Mr. Morris, adding: “The complexity of the situation demands that we must do all we can to help Governments in the region.”The HIV/AIDS-driven aspects of the crisis are now considered so grave that Mr. Morris called 10 UN country representatives in the region to Johannesburg, South Africa, for a special review meeting today to examine current interventions, joint programming, UN reform, and the strategies to address the multiple impacts of the triple threat.”It’s crucial that we reverse the downward spiral on child survival in this region. There are remarkable local initiatives across the region to prevent the spread of AIDS from mother to child,” said Ms. Veneman. “By expanding these successful models we can reduce the number of infants contracting HIV.” She added that treatment for HIV-positive children and adults is a critical element of the regional response. “Keeping more parents alive means fewer children orphaned by AIDS,” she said.Ms. Veneman is the first UNICEF chief to visit Swaziland, the tiny African nation that suffers from of one of the world’s highest HIV prevalence rates, with about 38 per cent of the adult population carrying the virus. After visiting yesterday with children orphaned by the virus – many now caring for frail grandparents or older relatives and unable to attend school – she emphasized the need to focus attention on children, for the benefit of all humankind.Joining the UN leaders in their call for action was Peter Piot, Executive Director of the Joint UN Programme on HIV/AIDS (UNAIDS), who said that over the 20-year span of the AIDS epidemic, it had become clear that an exceptional response is required. “We need to make sure that HIV prevention, food security and HIV treatment are integrated into a comprehensive response. This is the only way to get ahead of the epidemic. We must aim for universal access to HIV prevention and treatment.”