Jun 23rd, 2006, 01:13
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Senior Member
 
注册日期: Jun 2006
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WK,我也来有奖竞猜！！奖金50万
你们玩化学游戏，我就玩建筑游戏。第一个猜中的奖5000多声望，就是说俺明天给你及你的马甲加5次，或者我换5次马甲给你加。 装修basement时，政府要求见附件。内墙不是已经做了insalation了吗？为什么外墙也要做？ 此帖于 Jun 23rd, 2006 01:35 被 fdq53 编辑。 |
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Jun 23rd, 2006, 09:26
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只看该作者 #5 |
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太好了， 总算可以不用眼馋六里台的豆子了! 我就不信：这个世界只有六里台的豆子最圆最大！ 为了赢得5000大豆，财经记者马甲4连夜赶读百万建筑书籍，终于找到正确答案： Performance of Thermal Insulation on the Exterior of Basement Walls Construction Technology Update No. 36, Dec. 1999 by M.C. Swinton, M.T. Bomberg, M.K. Kumaran, N. Normandin and W. Maref Basement problems are a frequent source of claims made under new home warranty programs. This Update presents the results of an IRC/industry research project on the performance of insulation systems applied to the exterior of basement walls.* A survey of new home warranty programs across Canada showed that the combined action of water and soils on basements was responsible for most major basement failures in new homes in 1994 and 1995.1 Frost action on basement walls was cited as a contributing factor in 40% of the failures; swelling clays (resulting from strong fluctuations of wetting and drying in clay soils) were responsible for another 36%; and frost action on the footings, a high water table and the presence of water-borne soluble salts contributed another 9% for a combined total of 85% of all failure cases surveyed. In the case of major basement failures, repairs are generally expensive: not only does the foundation itself usually need to be repaired, but also the elements that protect it have to be put in place to prevent future problems. For instance, the provision of drainage elements, such as eaves troughs, proper grading, wall and footing drainage, accounts for a substantial share of the repair costs incurred by warranty programs for basement repairs. The need to protect the foundation from the below-grade environment is not a new concept.2,3,4,5,6 (The first consideration of insulation applied to the exterior of house basements goes back about 30 years.3,4 ) Over the years, new products and systems have been introduced to perform this function. How these products and systems actually perform and whether or not they can meet the performance requirements for basement applications are key issues being addressed by those responsible for developing regulations governing their use in Canada. It was in this context that IRC initiated a research program in collaboration with industry partners to take a fresh look at how exterior basement insulation systems perform (see Text Box 1 "Design and Installation Parameters Investigated" for discussion of insulation system variables). Text Box 1 Design and Installation Parameters Investigated (See Figures 2 and 3) The following parameters were investigated: Five insulation products: 1) moulded expanded polystyrene (EPS) Type 1 2) moulded expanded polystyrene (EPS) Type 2 3) medium density spray-polyurethane foam 4) semi-rigid mineral fibre intended for exterior application to basement walls 5) semi-rigid glass fibre intended for exterior application to basement walls Two installation approaches for the insulation products: 1) in direct contact with the soil below grade 2) wrapped (but not sealed) in two layers of polyethylene Various joining techniques for the insulation products: 1) butt joints 2) ship-lap joints 3) continuous spray foam Two approaches to relieving water pressure on the inner side of the insulation boards: 1) grooves 2) no grooves Two approaches for mounting the above-ground protective cover (fibre-cement board): 1) vertical Z-bars 2) horizontal Z-bars Two grading schemes: 1) sloped away from the wall (good landscaping practice) 2) sloped towards the wall (poor landscaping practice) Two approaches with respect to the gravel underneath the backfill: 1) Protected by filter cloth over the gravel 2) Unprotected Exterior basement insulation can play a number of roles within the basement envelope system (see Text Box 2). Since heat-loss control and ground-water management are the critical roles that any exterior insulation must play, both were assessed in the IRC study. Heat-loss control is dependent on many factors, including how well the basement wall system manages water (i.e., keeps moisture out of the wall system). The water-management capability of the insulation is related to the overall watermanagement strategy for the basement envelope system (see Figure 1). The diversion of ground water away from the basement is the primary means of controlling the quantity of water that the below-grade wall has to deal with. Surface-water control is seldom perfect, however, hence the basement envelope system must be designed to keep out any rain and melt water that finds its way below grade. |
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Jun 23rd, 2006, 09:27
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只看该作者 #6 |
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of drainpipes, which means that this experiment did not yield any definitive information on the question of whether or not the filter cloth helps prevent the gravel from clogging the drain pipes. Protecting Foundations from Freeze/Thaw Action The coldest concrete temperature, measured at 270 mm below grade during the heating season, was about 11°C. Obviously, no freeze/thaw cycles were observed in the concrete. As well, portions of the wall system near grade that would normally experience freeze/thaw conditions were protected from melt or rainwater by the fibre-cement board. Conclusions A high-performance basement envelope system must address all the functions required of such a system. To achieve a high level of performance over time, it is particularly important to differentiate between the insulation system and the insulation product. All the insulation products assessed in the study delivered similar, sustained thermal performance. At the system level, some systems performed better than others — specifically, the thermal performance of those systems with horizontal Z-bars, in which the thermal bridge was broken, was superior to those with vertical Z-bars, in which it was not. All specimens also managed water well, using different, but equally successful, strategies. Summary Only small differences were found among the different products in their ability to provide sustained thermal performance — each employs a different water-management strategy. EPS Type 1 was shown to be suitable for application to the exterior of basement walls. It is important to avoid thermal bridging — even limited contact with another thermally conductive element, such as concrete, can have a significant impact on the thermal performance of the entire basement wall system. Protective covering plays an important role at and just below grade level, where freezethaw action is likely to be most severe. The need for drainage grooves to enhance the performance of the second line of defence should be re-examined. Shallow sloping of landscaping cannot be counted on as a means of keeping water away from the basement wall, as it does not last. Diverting surface water is the primary means of controlling the amount of water that the basement envelope system has to deal with. Exterior insulation can provide a first line of defence for the basement envelope system if it has sufficient watermanagement capability. This capability was effectively delivered by all the insulation specimens evaluated.Attention to installation detailing is important with semi-rigid and board insulation products, to ensure continuity of the first line of defence at the joints and corners. |
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Jun 23rd, 2006, 09:35
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只看该作者 #11 | |
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引用:
我晕，原来是你！ 你太牛了，上次嘉宾没有把你特邀进取，下次一定特邀！5000大豆啊！ 洋文我也不懂，算了，找个机器翻译一下重点文字： 地下室外墙隔热可以发挥一些作用,在信封库系统(见文本框2). 由于热损失控制和地下水管理的重要作用,任何外部绝缘必须发挥,在体育馆进行了评估研究. 热损失控制取决于许多因素,包括如何管理好地下室外墙水系统(即湿度保持在墙制度). |
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Jun 23rd, 2006, 09:39
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只看该作者 #14 |
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Senior Member
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再来一段机器翻译的： 调查新家保修节目在加拿大发现的联合行动和土壤的地下室负责最重要地下室失败新院于1994年和1995.1霜行动地下室墙壁被认为是一个重要因素,40%的失败; 有无肿胀(因强烈波动,这种殉葬用的泥偶土壤干燥、夜尿)负责另36%; 此前,在行动总结,地下水位高,有水媒可溶性盐提供另9%的85%共调查了所有的失败案例. 。。。 必须保护基金会从以下级环境不是一个新concept.2,3,4,5,6(首次审议绝缘应用于外表地下室房子可追溯到约30years.34)多年来,新产品和系统采用了履行这一职责. 如何把这些产品和系统,并切实履行它们能否满足性能要求地下室应用问题进行讨论,主要是负责制定规章在加拿大使用. 正是在这一背景下,体育馆开始了研究计划与业界合作伙伴重新考虑如何地下室外墙隔热系统进行(见文本框1"的设计和安装参数调查"讨论隔热系统变数). 。。。 结论： 。。。 外表绝缘可为第一道防线,如果系统有足够的地下室信封watermanagement能力. 这种能力是有效样本所作的一切绝缘评价 |
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这么快有人答对了
