On the inside of the concrete rim, we have a sheet metal
roof. A structural steel frame carries the roof sheeting. Steel I-beams are welded
to a steel base plate which is fastened to the concrete with chemical anchors. A
steel angle is welded onto the top of the I-beam. Steel purlins are then fixed
to the steel angles with bolts and nuts. Everything is in place to receive the roof sheeting.
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