Kerfing wooden door sill

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just a quickie :)  

Im finishing up a sapelle entry door project and final piece is the sill.  Should I put kerf lines in the bottom??  I have seen some with , some without.  The one closest to the edge im guessing is the drip edge and the ones throughout the body are for sealant to settle in?   







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Notice the grain orientation. The kerfing is intended to keep that board from warping with humidity as the longer rings will grow a touch more than the shorter. If you can source a different sweep, then it is more common to have a sealant seat that is wider than a mere kerf. Like Tom alludes to, that is likely unnecessary, but could help make less mess with sealants. 

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