International Journal of Engineering and Technical Research (IJETR) ISSN: 2321-0869, Volume-2, Issue-11, November 2014 32 www.erpublication.org Abstract— This study discusses a novel study and develop the important climatic data in Iraq and UAE for changes in construction materials plant design. It is difficult to identified reliable and microclimate data and related information. There are many types of construction changes and each type can have an effect on labor and machinery productivity. But what is the effect of extreme heat and dust storm on construction industry can occurs either indoor or outdoor work. Construction materials production data from United Arab Emirates region over 2100 productive days period were collected. This study found that the adverse sever summer climate of heat and dust storms lead to a significant reduction in production. An average of week with six days during summers of heat exceeding 46C with high humidity reduces production in the week by 10% on average. A cross the regional companies, severe weather reduce production on average by 7% and delay the deliveries date. While it is possible that companies are able to recover these losses at some later date of summers. Further, even if recovery does occur at some point at very least these shocks are costly as they increase the volatility of production. Also this study concludes useful results for assessing the potential productivity shock associate with inclement weather as well as guiding managers on where to locate a new production facility. We recommend developing of empirical model for Heat Prediction in the region to expect to become more relevant as climate severity and frequent of severe weather.The results of our study also suggest raising the temperature to a more uncomfortable thermal zone lose employers about $2 per worker, per hour,” Index Terms— Heat, Dust storm, Productivity, Construction materials. I. INTRODUCTION It well known that there is a relationships between climate and economic activities of construction industry. It is intuitive that climate can impact outdoor activities of the construction materials manufacturing, agriculture activities, tourism especially g of the projects; lost opportunity profits from projects cannot be pursued; the costs of bidding and managing projects (defensively) and so no. Besides, there are intangible costs; such as personal cost to the careers of people who are enmeshed in acrimonious disputes. Although, the costs there are positive things likes reduce costs or improve its overall lifecycle value.. But the wrong type of the change can increase the cost of the projects and reduce the economic value of a project. Manuscript received November 01, 2014. Hatim A. Rashid, Construction Management Engineering Section, Civil Engineering Department, College of Engineering, Alnaharain University, Jaderia, Baghdad Obviously, extreme climatic factor such as heat can affect projects in many ways, the most importantly by disrupting and impairing a project‟s labor productivity. Different types of changes have been studied by research workers: weather, schedule acceleration, and so forth. Postulated that change implemented late in a project will have more unsettling impact on labor productivity than the same change implemented either in the project [5]. A number of papers investigate sourcing strategies when supplies have varying reliability [6]. [7]. [8] while some work investigated disruption empirically by [9]. There are none of these cases are connection made between timing changes and severe weather. Previous studies exists on the subject of discrete timing impact than on the subject of accumulative impact. Some of the studies are based on scientific research methodologies where empirical data are collected and analyzed, and others are controlled. A study on overtime portrays the effects that extended periods of overtime of 55 hours work weeks for 1-14 weeks have on labor productivity. In the reality of this study [10] is extrapolation of a series of small, independent projects over a 10 year period time. The outcome of the results from this data is imperfect. The effect of temperature and humidity on productivity study was conducted by [11], [12], [13] tested the effects of schedule acceleration on productivity. [14] examined the amount of change for different project delivery systems. The impact of timing changes on productivity were not examined. [14] studied the timing changes on productivity but this study did not prevalence of bad weather which the results can be expected to become more relevant as climate change may increase the severity and frequency of severe weather, particular of construction industry to long –term changes in climate conditions and in the a short-term to changes in the weather is grown concern to many states in the region officials. The objective of this study is to confirm that weather can be used as an exogenous shock in construction industry timing and production, which is useful in the development of valid instrument for other research. in hot regions. [1] reported that less clear is the impact on climate insensitive section such as manufacturing and services. Changes in production and timing especially when it results in protracted disputes and litigation is a serious and expensive problem for the construction industry. The changes in production and timing were pervasive and added about 6% to the direct cost of 22 government projects [2]. [3] found averages can be deceiving: 50% of the 24 Canadian projects in this data set had cost claims for more than 30% of the original bid value. Weather Effect on Workflow, and Labor Productivity of Construction Plant Hatim A. Rashid