Today we did some cladding on the outside of a steel framed building. The first thing we did was line the frame with sarking, a reflective layer of foil and put flashing over the corners. Then we screwed in the internal and the external corners and screwed the bottom board on. To make sure the bottom board is nice and straight we got out the level and adjusted it. We put some packer under this one to keep the splay. Make sure you have a 25mm overlap on each board before nailing and butt the boards hard up against the external and internal corners. because it was a steel frame, we used a drill with a phillips bit to screw the boards down, howerver if it were timber, nails should be galvinised flat-heads for softwood, bullet head for hardwood.
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