Musculosketal disorders, particularly shoulder, are public health major issue in professional world (more than 78% of occupational diseases). No study has been made with closing installer population. This activity sims to expose to risks factors. The aim is to make a description of the shoulder musculoskeletal disorders prevalence just as risk factors evaluation. This work will consist in estimating sinistrality of this population throug data from health insurance, regional statistics from Rhône Alpes ineptitude observatory (2014) and recognition of handicaped worker in Haute Savoie (2008 to 2015).It will make a estimation of workers size making closing installer. This analysis will lean on investigation tool, clinical examination and shoulder functional score (Constant score). The activity study, observed in 6 construction sites, allow to illustrate the presence of the shoulder musculoskeletals disorders risk factors in all construction site stage. More than 80% of occupational diseases recognised are linked with shoulder diseases for this group. 10.5% of employees likely to make closing installer have been recognised like handicaped workers for shoulder trouble. 10% of ineptitude affected employees likely to make this activity. 64 employees have been seen in consultation. 37.5% of them have shoulder trouble during the last 12th months. 76.5% have clinical signs. In 68% of the case, the raw Constant score and in 48% of the case the age weighted Constant score are abnormals. This study shows a high prevalence of shoulder musculoskeletal disorders in this population. This trouble can lead to a ineptitude statut. The knowledge of this study will be employed to prevention.