E - Fixed Constructions – 04 – B
Patent
E - Fixed Constructions
04
B
E04B 1/38 (2006.01) E04B 7/04 (2006.01) E04H 9/02 (2006.01) E04H 9/14 (2006.01)
Patent
CA 2287797
This invention comprises ways and means of strengthening roofs to withstand hurricane winds using widely spaced anchor assemblies consisting of clasps and tension members to hold down the overhanging eave portion of the roof to strong anchors in existing structural members in the wall below. The wide spacing exploits the roof's bending strength and folded plate action along its length (in the direction across the framing members in the roof plane); the invention includes means of reinforcing that strength by means of beams where suitably strong anchorage points occur too far apart. Alternatively, the invention includes means of strengthening a framed wall to receive and secure anchors where no framing exists at the desired point. The invention minimizes disruption of building and occupants, entailing little make-good, and the number of anchor assemblies, all serving to minimize costs. Where the underside of the eave is not closed in, ie. there's no soffit closure, then "U" clasps grip certain of the protruding rafters or truss extensions and are tied to the wall anchors. An alternative yoke type of clasp is described. Where the roof overhang is itself too weak against wind uplift the clasp points can be located suitably outboard of the exterior wall, toward the fascia, thereby reducing the cantilever span of the overhang while also tying down the roof proper. Where, on the other hand, soffit closures prevent access to the rafters, flanged clasps are fixed to the fascia and edge portions of the roof and tied to the wall anchors. That also strengthens the overhangs, effectively removing their cantilever condition. The wall anchors are inserted into window or door bucks or frames or wall junctions to exploit the embedded load-spreader capability presented by such frames and junctions. Preferred materials for the anchorage assemblies are non-corrosive steels, which may be blackened or otherwise coloured for appearance.
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