birdsmouth means A notch cut into the underside of a rafter to ensure that it does not move when resting on the wall plate running across the top of a wall; a similar notch in other timber components. Lexicurio rates it Rare gem — a strength score of 76 out of 100.
noun
- A notch cut into the underside of a rafter to ensure that it does not move when resting on the wall plate running across the top of a wall; a similar notch in other timber components.“Support the veneer stack on a ¾-in.-thick board with a narrow V notch cut into one edge. This board is called a birds-mouth, and the V notch provides clearance for the blade while the work is supported for cutting.”
verb
- To cut a birdsmouth into a rafter or similar timber component.“The end of the common rafter is birdsmouthed and nailed to the pole plate.”