GBA Logo horizontal Facebook LinkedIn Email Pinterest Twitter X Instagram YouTube Icon Navigation Search Icon Main Search Icon Video Play Icon Plus Icon Minus Icon Picture icon Hamburger Icon Close Icon Sorted

Community and Q&A

rotten wood on corner post

cord12 | Posted in General Questions on

Hello, I have a corner post (3 sandwiched 2x4s) of our garage where the bottom has some rot (roughly 1/5th of the longways width of two of the 2×4 are rotten from the mud sill up to about 6″ on the post).  I know how the water was getting in (tear in the house wrap). What is the best long-term fix for the corner post. I was thinking remove all the rot, treat the balance with wood preserver and then “sister” in some additional support. I’m going to liquid flash the new sheathing once the corner post is sound. Thanks, David

GBA Prime

Join the leading community of building science experts

Become a GBA Prime member and get instant access to the latest developments in green building, research, and reports from the field.


  1. Expert Member
    Michael Maines | | #1

    The best approach would be to replace the post entirely. If you have truly fixed the water infiltration problem, sistering the post would likely work as well, but it wouldn't be much more work to just do it right.

Log in or create an account to post an answer.


Recent Questions and Replies

  • |
  • |
  • |
  • |