Birdsmouth

Birdsmouth

A V-shaped cut at the end of a structural member; typically found where a rafter meets the top sill or plate of a stud-framed wall.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
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After public consultations on the whole scheme, PS15,000 was set aside to upgrade the birdsmouth fencing with decorative railings and construct the footpath at the Flatts Lane site, opposite Hollywalk Avenue.
Proposal: Development of enclosed play area, bitmac and gravel extension to existing car park, games area, relocation of existing storage container, general landscaping improvements including birdsmouth perimeter fencing, dog waste bins, litter bins and picnic benches and new steps and ramps, appropriate street signage and one CCTV column and lighting columns at Oakey's Field, Barn Hill, Stanley, County Durham.
The guide contains illustrated drawings of floor, wall, and roof components, plus offering solutions to common errors in frame openings, joist hangers and nails, blocking, holes and notching, cantilevers, load paths, birdsmouth cuts, roof loads, rafter ties, ridge beams, and trusses.
One fairly common problem I see with rafters is overcutting the birdsmouth. This can weaken the framing by encouraging rafters to split.