Shamsi in, Dale Steyn left out JOHANNESBURG (AP): South Africa called up uncapped left-arm wrist spinner Tabraiz Shamsi for next month’s triangular limited-overs series in the Caribbean and rested fast bowler Dale Steyn amid concerns over his workload. Shamsi was the only new player in the one-day international squad announced yesterday, although pace-bowling all-rounder Wayne Parnell was recalled for the first time in more than a year. Head selector Linda Zondi said Steyn was rested for the triangular series against West Indies and Australia to keep him fresh for the test season. South Africa, who lost their No. 1 ranking in Tests with a home loss to England in January, have series against New Zealand, Australia and Sri Lanka this year. Batsman Faf du Plessis was in the ODI squad for the Caribbean despite sustaining a broken finger in the IPL. Du Plessis had surgery on the broken left ring finger this week and should be ready for South Africa’s second game of the triangular series against Australia on June 7, team manager Mohammed Moosajee said. Pakistan pick Arthur ISLAMABAD (AP): Mickey Arthur replaced Waqar Younis as head coach of the Pakistan cricket team yesterday. The Pakistan Cricket Board said the 47-year-old Arthur, a South African who has previously coached his country’s national team and Australia, will take up his new assignment at the end of the month. Younis stepped down last month after Pakistan won only one of its four group matches at the World Twenty20 in India. Arthur was among four foreign coaches shortlisted by a panel including former captains Wasim Akram and Ramiz Raja. He will be the fourth foreigner to coach Pakistan after Richard Pybus, Goeff Lawson and the late Bob Woolmer. Arthur played 110 first-class matches for South Africa before coaching his national team in between 2005-10. Footballer dies after collapse at match BUCHAREST, Romania (AP): Dinamo Bucharest player Patrick Ekeng died after he collapsed during a match in the Romanian capital yesterday, doctors said. He was 26. Cristian Pandrea, a spokesman for the Floreasca Emeregency Hospital, said doctors tried for an hour to resuscitate the Cameroon midfielder but failed. He said the cause of death was not known. The home match between Dinamo and Viitorul Constanta was at 3-3 and being broadcast live when midfielder Ekeng fell to the ground in the 69th minute, seven minutes after he went on as a substitute. Local media said he had a heart attack. Ekeng was immediately taken to the hospital, where dozens of fans gathered outside. Players and staff could be seen crying as events unfolded. Some went with him to the hospital. He has played for Spanish club Cordoba CF, Swiss club Lausanne, and French club Le Mans. He moved to Dinamo in 2015. Ekeng is survived by a wife and daughter who are in Paris. Prosport.ro, an online sports publication reported he was due to fly to Paris after the Romanian Cup final on Tuesday between Dinamo and CFR Cluj.
Willian had the best chance of a cagey first 20 minutes at Stamford Bridge.The Brazilian latched on to a ball played into the right channel and advanced on goal but his shot was blocked by Everton keeper Tim Howard.Ross Barkley has twice had shots blocked – once by John Terry, another by Kurt Zouma – and the second one dropped to Bryan Oviedo, but he sidefooted just wide.Chelsea made one change from the side which drew 2-2 against West Bromwich Albion, with Nemanja Matic replacing Oscar in the starting line-up.Cesc Fabregas started in Oscar’s more advanced role, with Matic and John Obi Mikel providing the base in midfield.Pedro kept his place, despite being taken off at half-time against the Baggies, with Kenedy, Ruben Loftus-Cheek and Loic Remy among the substitutes.Everton have made three changes, with Oviedo coming in at right-back and one-time Chelsea target John Stones reverting to centre-half.Kevin Mirallas and Aaron Lennon are also back, while Ramiro Funes Mori, Leon Osman and Gerard Deulofeu drop to the bench.Chelsea: Courtois; Ivanovic, Zouma, Terry, Azpilicueta; Mikel, Matic; Willian, Fabregas, Pedro; Costa. Subs: Begovic, Baba, Cahill, Loftus-Cheek, Kenedy, Oscar, Remy.Everton: Howard; Baines, Stones, Jagielka, Oviedo; Besic, Barry; Mirallas, Barkley, Lennon; Lukaku.Subs: Robles, Funes Mori, Cleverley, Osman, Deulofeu, Pienaar, Kone.Follow West London Sport on TwitterFind us on Facebook
The best route, Holladay says, is to use an air-impermeable insulation — either rigid foam with seams that have been carefully sealed or closed-cell spray foam.In theory, mineral wool and a clean cement surface shouldn’t support the growth of mold, adds Charlie Sullivan. “But if it’s a retrofit,” he adds, “there will probably be enough gunk there that you can’t clean off that it will still support mold growth.”He suggests that if the homeowner’s objection to rigid foam insulation is the global warming impact of the blowing agents used to manufacture it, choosing expanded polystyrene (EPS) over extruded polystyrene (XPS) is a good option. “But if the homeowner is philosophically opposed to petrochemicals,” he adds, “that doesn’t help.”Another option, Sullivan says, would be to use a product called Foamglas, described by its manufacturer as “cellular glass.”Sullivan’s tip has Chappell-Dick on the phone with the manufacturer, and at first blush Foamglas looks like a great alternative. It comes in 2-by-4-foot sheets, has an R-value of 3.4 per inch, and costs $1.20 per board foot.Fiberglass batts are not really an optionWriting from upstate New York, AJ Builder says the method typical in his area is to frame a wall 1 or 2 inches away from the concrete basement wall, insulate it with fiberglass batts and cover the wall with foil-faced insulation. “No mold issues,” AJ Builder writes.“I don’t know if you are being deliberately provocative, or whether you honestly think that this is the appropriate way to insulate a basement wall,” replies Holladay. “The technique you describe is about two or three decades out of date, and there are plenty of reports of failures resulting from this technique.”“I know it’s wrong,” AJ Builder says. “I also have never seen mold or moisture. We build in gravel and glacier moraine, and poured concrete here is quite water-resistant from my experience. Just telling it like it actually is. No [Rockwool] use, no foam, all batts of fiberglass, done. Thousands.”Be that as it may, Chappell-Dick says, “wood and fiberglass ain’t gonna happen.”What about adding a waterproof membrane to the assembly?If the risk of using an air-permeable insulation is that moisture will condense on the cold, inside surface of the foundation wall, what about keeping the moisture out of the wall assembly with some kind of a barrier?“I’m asking about putting the liner on the warm side of an R-10 or R-15 insulation on the CMU stem wall,” Chappell-Dick says. “I presume the dew point then will always be inside the insulation, and thus no condensation. And thus I can use [Rockwool]?”He adds: “Overall goal: to condition a crawl space without using foam.”Holladay finds three flaws with this approach. The first is that air between the fibers of the Rockwool insulation is warm, humid indoor air, “not magic dry air.” Second, daily changes in temperature will create a “pumping action” that provides an air exchange between basement air and the air within the insulation, so that eventually humidity finds its way into the wall assembly.“The third problem,” Holladay adds, “is that the concrete is damp, so that it’s possible for the area between the concrete and the membrane to get damp from that direction, too. The membrane traps moisture, leading to mold.”But lots of basements are insulated with fiberglassRichard Beyer is not understanding why a wall assembly that keeps moisture out of the mineral wool insulation with a waterproofing membrane is going to result in mold.“This proposed system will work providing a back-up dehumidifier and sump pit is added to ward off the unknown here and/or the potential freak storm which could change the drainage dynamics of this property,” Beyer writes. “Did I misunderstand something here?”Further, Beyer says, AJ Builder is correct: many homes in New England have fiberglass installed against raw cement walls with no mold issues.“Sometimes published building science is not always correct,” Beyer says. “Hence, why it’s consistently rewritten when failures occur, no different than our building codes. Most writings come from manufacturers who are selling product and who are filling the pocket’s of specifiers with $$$$.”Beyer wonders why Holladay is suggesting foam insulation when the homeowner doesn’t want the material in the house, adding, “I should also note there are many failures of foam out there, too.”Chappell-Dick also is curious about why a wall assembly in which the mineral wood is isolated from the crawl space wall by a membrane would be a problem.“The most important thing I have learned on this site is that while pure building science is exact and completely unarguable, applied building science is far more nuanced,” Chappell-Dick adds. “And, frustratingly arguable. It’s not so simple as ‘managing moisture.’ We’re managing risk and clients’ expectations, all at the lowest price possible while somehow extracting an income.”Also, says Beyer, building science has been in error many times over the years. For example, galvanized steel joist hangers were once specified in coastal locations, but it’s since been replaced by stainless steel. Why? Because galvanized steel corroded and failed.The membrane will trap moistureThe problem, Holladay replies, is that moisture can come from either direction. “If Andy followed your advice,” he writes to Beyer, “the waterproofing membrane would be chilled by the cold concrete, and would form a condensing surface for moisture in the interior air.”Holladay concedes that some installations using the method that Chappell-Dick proposes are successful. “The method is safer in warmer climates than in cold climates (because a concrete wall doesn’t get as cold in Alabama as it does in Vermont),” Holladay says, “and it is safer in a house with a very dry basement than a house with a damp basement.”But the bottom line is that any wall assembly including a waterproof membrane and batt insulation against a foundation wall is risky, Holladay says. This applies to walls with a layer of polyethylene plastic against the concrete, followed by fiberglass batts, as well as walls where the batts come first, followed by poly. Ditto for walls with two layers of poly and fiberglass in between.“What happens?” Holladay asks. “If you are lucky, and the soil around your house and the air in your basement are dry, these methods can work. In other cases — and plenty of remodelers have seen the failures, again and again — you end up with a moldy mess.“In other words, these sandwiches of fiberglass and polyethylene are risky. You are rolling the dice. But if you are feeling lucky, go ahead and roll the dice.”Our expert’s opinionHere’s how GBA technical director Peter Yost sees it:A crawl space foundation is just a short basement; you need the same three barriers that you need for any assembly — continuous air, water, and thermal barriers — as well as provisions for directional drying.Just as you would not insulate a basement before managing moisture, you need to manage moisture in the crawl space first, and then move on to insulation and air sealing. Check out this resource from Building Science Corporation.And if indeed crawls are just short basements, then check out these other BSC resources.Air-permeable insulations, including mineral wool, need a separate air barrier (and more than one of the BSC foundation details accomplishes this with a sealed rigid insulation layer between the masonry foundation and the air-permeable “cavity” insulation). Above-grade walls can have interior air barriers, like the Airtight Drywall Approach (ADA), but it is hard to consider ADA as appropriate for a crawl space or think of other interior sheathing that you could or would use as an interior crawl space air barrier.Insulating any building assembly on the interior makes the assembly colder; it’s just that masonry walls tend to care a lot less than framed walls, particularly ones sheltered below grade. For me, it’s that portion of the “below-grade” wall that is actually not below grade that is worrisome. And does it really matter if that condensation is only occurring in the portion of the wall above grade? It still represents a problem for any materials that can grow unintended biology.We tend to think of below-grade spaces as damp and cold because they are in contact with the soil and often aren’t moisture-managed. But if a crawl space is moisture-managed, you can air seal and insulate it just like a basement. Also bear in mind that any work to insulate and air seal the crawl space may have impact on levels of radon in the crawlspace and possibly the living spaces above.Using Foamglas is definitely a premium approach: the product has a good R-value, is inert, and is air-impermeable. With any other insulation approach, establish the three barriers and then check for directional drying potential. And frankly, if you can’t moisture-manage the crawl space, don’t insulate it. Andy Chappell-Dick is at work on a house in Climate Zone 5 where the task at hand is to upgrade a crawl space by adding insulation as well as a membrane to block the infiltration of moisture. The catch? The owners want to avoid the use of rigid foam insulation if at all possible.The floor of the crawl space is about a foot below grade, Chapell-Dick writes in a Q&A post at GreenBuildingAdvisor, and the area seems to be well drained. Foundation walls are made from concrete block (CMUs).He plans to foam in pieces of rigid extruded polystyrene in the rim joist area. To insulate the crawl space walls, Chappell-Dick wonders whether Rockwool Comfortboard 80, a rigid mineral wool insulation, would make a good substitute for rigid foam. Rockwool Comfortboard 80, according to the manufacturer, is non-combustible and chemically inert, and it’s made from natural and recycled materials, including rock. Rigid foam is a petrochemical.A second issue is how the waterproof membrane should be installed: should it be run up most of the crawl space wall, or can it be terminated at the base of the wall? And, Chappell-Dick wonders, does this detail have any bearing on the performance of insulation?That’s the backdrop for this Q&A Spotlight.This is not the place for RockwoolThe inherent air-permeance of mineral wool insulation makes it inappropriate for this application, writes GBA senior editor Martin Holladay.“The mineral wool can’t prevent humid interior air from contacting the cold crawl space walls,” he says. “The likely result will be moisture accumulation and mold.” RELATED ARTICLESHow to Insulate a Basement WallBuilding an Unvented Crawl SpaceFive Ways to Deal with Crawl Space Air From Building Science Corp: Conditioned Crawlspace Construction, Performance and Codes From the Canada Mortgage and Housing Corporation: Development and Assessment of Crawl Space Remediation StrategiesFrom Fine Homebuilding: Sealing a CrawlspaceCONSTRUCTION DETAILSInsulated and Conditioned Crawlspaces
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