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Investigation: <br />The building complex consists of several interconnected structures. Our investigation <br />was limited to the roof of the pre-engineered metal building making up the west half of <br />the facility. Building structure in this area appeared to consist of a steel roof supported <br />by steel roof purlins and girders. Almost the entire roof structure was finished with foam <br />insulation and a light fibrous material that could be sound insulation, fireproofing or both. <br />In order to access the steel structure the finishes had to be removed in that area. These <br />materials should be replaced by you. <br />Once the finishes were removed the steel could be visually inspected for corrosion. <br />Observations• <br />Corrosion of interior roofing members and non-structural items. <br />Throughout the roof structure areas of corrosion were noted on the roof purlins and <br />bracing members. Although in some cases no evidence corrosion was noted on the <br />finishes typically corroded areas were made evident by a discoloration of the finishes <br />and/or water marks. Because these water marks did not travel long distances and <br />appeared to dry without significant dripping we believe the presence of water is due to <br />condensation and not a leaking roof. <br />Although the areas uncovered were not severely corroded to the point of scaling or <br />expanding steel the corrosion was severe enough to warrant a better understanding of the <br />issue. Several areas throughout the roof structure had evidence of moisture being present <br />at some time and should be examined but due to the limited amount of time budgeted for <br />this initial investigation our findings are limited. <br />~~ .w. <br />~. _. <br />v'.rr~ <br />i <br />s <br />'~ ~ d. ~ <br />may„ ~« «A .;~ <br />} <br />t <br />~: ~ a" <br />These pictures are of the roof structure. Please note that the date on these pictures is <br />incorrect. The date of our investigation was February 25th. Corrosion is the brown <br />color within the grey color of steel within the area of removed insulation. Insulation is a <br />variation of light reddish-brown to yellow and the light gray color encompassing most of <br />the pictures is the fibrous finish. The dark gray area in the right hand picture could be <br />where the roof is allowing vapor to escape and/or an area where moisture collects. If <br />vapor is escaping through the insulation condensation may be the result and thus the <br />