Job Interview Practice Test Why Do You Want This Job Answer this job interview question to determine if you are prepared for a successful job interview. Search titles only has image posted today bundle duplicates include nearby areas akron canton cak ann arbor, MI aaa. To Install Stucco Right, Include an Air Gap. In many areas of the country, hundreds of stucco clad homes have suffered wall rot. Although building scientists are still researching the causes of wall rot behind stucco, its clear that all of these walls got wet and were unable to dry. Among the reasons that have been proposed for the recent epidemic of stucco clad homes with wall rot Many of the houses had OSB sheathing. Fun Math Games For 5Th And 6Th Graders. Material, 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 sheathingsometimes over strapping to create a rainscreen. Many of the houses had only one layer of Grade D paper or asphalt felt under the stucco rather than two. The homes lacked a ventilated air gap between the stucco and the sheathing. In many of the homes, interior polyethylene prevented the walls from drying to the interior. Many of the homes had flashing errors. Some of the homes had high indoor humidity coupled with an imperfect air barrier. Building 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. Darkness 2 Iso. The air barrier can be on the exterior, the interior of the assembly, or both. If youre planning to install stucco on a wood framed wall, you can benefit from the many lessons learned from all of the failed stucco installations of the last twenty years. Before we tackle the question of how to avoid such failures, however, lets delve into some stories from the recent wall rot plague. A failure rate of 5. I wrote a special report on rotting stucco clad walls in Minnesota for the May 2. Energy Design Update. The article began, In Minnesota, home inspectors have discovered that hundreds of recently built homes especially stucco clad homes have rotting walls. In spite of years of efforts by construction experts to educate builders on improved water management details, wet walls continue to take a staggering toll on builders and insurance companies. According to Ron Glubka, the chief building official in Woodbury, Minnesota, the citys wet walls represent the largest construction defect problem in local history. Glubka reports that the building department has issued permits for wall repair work for 3. Woodbury in the 1. In most of the Minnesota cases, the necessary wall repair work has not been minor or cheap. In one case discussed in the November 1. Star Tribune, a Minneapolis newspaper, the stucco walls at the Woodbury home of Steve and Debbie Long required 1. The costs incurred boggle my mind, says Paul Ellringer, an engineer and building consultant in St. Paul, Minnesota. The worst case Ive seen is one where the repairs cost 7. Just in Minnesota, the problems have been costing hundreds of millions of dollars a year. Builders called to fix failed stucco often flub the repair. Unfortunately, the expensive repairs made to rotting stucco houses have themselves proved faulty. The Energy Design Update article noted, As further evidence that some Minnesota wall repairs have been based on faulty diagnosis, experts note that some rebuilt houses are beginning to fail for a second time. According to building consultant Mac. Gregor Pearce, In a significant number of houses, the repairs to the stucco have failed too. Among those who have seen failed rebuilds is Paul Ellringer. Ive had two clients where their house was rebuilt twice, said Ellringer. With one client, we are on the third rebuild. The earlier rebuilds failed because they keep redoing them the same way. Most rebuilds are feeble for example, they will just tape the window fins with four strips of tape rather than using a pan flashing. Building diagnostician Steve Klossner blames the failed rebuilds on bad diagnosis. Some of these buildings have had major fixes, and they are already failing a second time, because the first time around they didnt catch all the causative issues, says Klossner. At one house I saw, they blamed the windows, so they pan flashed the windows. The first time, they put it all back together and ignored a major problem elevated indoor humidity. Stone Mason Vinyl Cement Patch' title='Stone Mason Vinyl Cement Patch' />Now the walls are wet again. Ellringer has seen so many rotting walls that he is prone to glum predictions. I think that eventually the failure rate for stucco homes will turn out to be 8. Ellringer. I also think the rebuilds will fail at the same rate as the original houses. A nationwide problem. Although the article focused on problems in Minnesota, similar clusters of wall rot problems have occurred throughout the country, wherever builders have installed stucco over wood framed walls. Nds Rom News Download For Android. Although rot problems have occurred in walls with differing details, the most risky wall type appears to have the following layers stucco, one or two layers of building paper. Typically referring to Grade D building paper, this product is an asphalt impregnated kraft paper that looks a lot like a lightweight asphalt felt. The Grade D designation has come to mean that the building paper passes ASTM D7. What Is The Best Vinyl Outdoor Storage Shed lt Small Shad Plant With Dotted Leaves Plans And Material List For A 12x16 Shed Free Shed Plans For 10 X 24. D7. 79 results. At times confused with roofing felt, roofing felts and building paper differ in two ways felts are made of recycled content paper, building papers of virgin paper felts are made of a heavier stock paper building papers a lighter stock. See also roofing felt., OSB, fiberglass filled studs, polyethylene, and drywall. While it always helps to have two layers of building paper instead of one, or to use plywood instead of OSB, or to omit the polyethylene, switching just one of these details is not enough to prevent a wall from being damaged by moisture. So whats the best way to detail a stucco clad wall to avoid these problems Lesson one Install at least two layers of building wrap under the stucco. The evidence is overwhelming one layer of asphalt felt or Grade D building paper is not enough protection under stucco. This fact is now reflected in most building codes. For example, section R7. International Residential Code requires that exterior plaster stucco be installed over a water resistive vapor permeable barrier with a performance at least equivalent to two layers of Grade D paper. Lesson two Install a ventilated rainscreen gap. TCCmasonrycement.jpg' alt='Stone Mason Vinyl Cement Patch' title='Stone Mason Vinyl Cement Patch' />Many stucco installers believe that two layers of Grade D paper or asphalt felt creates a drainage gap between the two layers of paper. The idea is that when the wet stucco mixture is troweled onto the metal lath, the stucco soaks the outermost layer of paper, which wrinkles when it dries. These wrinkles are said to create a drainage gap. Although the theory has some merit, thousands of failed walls have shown that two layers of paper arent enough to prevent OSB from rotting. Whatever wrinkles exist in the paper are not enough to allow water to drain or to allow the stucco wall to dry faster than it gets wet. Stucco absorbs water every time it rains, and it dries very slowly. To prevent wet wall problems, its essential to include a true ventilated rainscreen gap behind stucco. The gap needs to measure at least 38 inch. If youre installing stucco over OSB or plywood, heres how to create a ventilated rainscreen gap If youre installing stucco over foam, heres how to create a ventilated rainscreen gap Install 1x. Fasten paper backed metal lath to the strapping, and proceed with a standard installation of three coat stucco.