Localized Notch Reinforcement for Wooden Beams

Agency:

Forest Service

Technology Description

The invention consists of a field-ready kit that provides localized high tensile reinforcement across the grain of a wooden beam by placing strong tensile strength fibers across a split line near notches in beams. Specifically, an “L” shaped patch consisting of flexible fiberglass with fibers running along an axis is placed adjacent to a notch in a wooden beam. This reinforcement stops cracks from propagating and strengthens the beam at the notch location. The patch bears markings on its surface that indicate the desired alignment of the patch with the wood grain and attachment is done via adhesive placed on one side of the patch. The patent is yet a further improvement of earlier patents related to the combination of wood and fiberglass to provide a simple and cost-effective method to reinforce wooden members. This patent may allow the use of lower grade wooden members for structural purposes for which they normally cannot be used and can also be used in repair and rehabilitation of wooden members in historic and other buildings. Potential applications include rafters and floor/ceiling joists.

Reference:

Please refer to Patent Number 5,852,909, which issued December 29, 1998.  Also, see related Patent Numbers 5,501,054; 5,575,117; and 5,720,143.

Inventors:

Robert J. Ross USDA Forest Service Forest Products Laboratory One Gifford Pinchot Drive Madison, WI 53705 (608) 231-9221

Douglas R. Rammer (Same as first inventor) (608) 231-9266 Lawrence A. Soltis (Retired)