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Rotted wood on sill and sill nose

The sill nose on my dining room window is partially rotted and I have removed it. I noticed that the face of the sill and the back of the sill nose have some grooves. I am thinking of replacing the sill nose with PVC which is a different size from the previous wood sill nose I removed. Is it important for the grooves on the sill and sill nose to interlock or does it matter.

I ask this because the face of the sill also contains some rot so I may not be able to get the groove on the back of the sill nose to fit into the slot in the face of the sill

Re: Rotted wood on sill and sill nose

You need to take that window out of the opening and replace the whole sill. That seam was never a good plan, but it saves the window company some money. Your framing under it could be full of rot too.
We spent a couple months one summer taking windows out of a stucco house to replace sills exactly like this. We used a better wood than the finger-jointed pulpwood the manufacturers use. We also found that water had gotten so totally under the stucco and house-wrap that many areas of the sheathing were also rotted away, and soaked insulation. So the owner had to have areas if stucco replaced after we did the repairs. In your case, it would be replacing brick.

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