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Question DetailsAsked on 2/23/2018

Do I need to fix an 8" or less section of sill plate that has been cut into/shaved down?

I have a small shed / studio in the backyard that is currently used to house a few cats. It has four outer walls and no interior walls. A neighbor helped me install a cat door in the middle of one of the walls, and I now see that in doing so he cut through the top part of about an 8" (or less) stretch of sill plate. The sill plate is still there, but it is not as thick now. Will this undermine the structural integrity of the wall? If so, what is the cheapest / easiest way of fixing the problem?

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1 Answer


You don't say what the foundation is like - but this section obviously is not carrying any significant concentrated load if a door was put there. By "sill plate", that is the bottom 2x (2x4 or 2x6 or whatever), laying flat, which forms the bottom of the wall and the studs rise up off of. Therefore, would either have a foundation under it, or more likely a framed plywood and joist subfloor under it which then sits on blocks or strip foundation or whatever. Assuming that is the case - that this bottom sill is not the bottom wood support for the wall bridging between two piers or blocks, no problem. Commonly that section would be totally cut away in putting in a normal entry door anyway.

Even if it is the bottom support for the building, assuming this is single story structure and does not see horrendous snow loads on the roof, would probably be fine anyway - especially for a shed.

One good idea through - at least put some metal flashing over that sill piece to prevent rot, overlapping the structure below it. Actually best if you can put a bit of a shed roof or awning, preferably with sides or an "arctic entry" around the opening so rain/snow does not blow into the door, especially when blowing out so it can push the flap inwards ande let rain pour right in. Like this -

Obviously does not have to be that fancy - but at leaat a shed roof or awning over the top to keep most of the water out (particularly since it will sit there - not be immediately mopped up like if in the house) will help prevent floor delamination and rot.

Answered 2 years ago by LCD

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