Do you know what these markings are used for? If so, do you use them?
16″ or 24″ center roof rafters? Find one rafter on vertical vent and you know where to expect the next one?
Never seen it before, but that’s my theory.
Never seen them on a saw before, cool though. We use a tape strip at these intervals on axe and roof hook handles, so the sounding FF can lay it out after sounding a member, or after an inspection cut is made.
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