When siding a house with wood shingles/shakes, it is common practice that the frieze board (when used) is applied on top of the highest course of shingles. Said another way, the upper-most course of shingle 'slide' underneath the frieze board. However, for the trim at the bottom of windows the shingles are cut flush to the trim and the trim is not applied 'on top' of the shingles. Can anyone confirm this is common practice and offer an explanation as to why?
I'm thinking one reason for sliding under the frieze board is that it reduces the amount of cuts that need to be made but I imagine there are benefits from reducing the possible water penetration points.
Any insight would be appreciated. I'm about to start siding my house and want to make sure I'm not missing any key points when it comes to applying the shingles.
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