05:19PM | 08/02/14
About four years ago I constructed an add-on porch to our home. The core supports inside the columns were made of face-to edge joined 2X4s these structures were then incased with one-bys clad boards. I let the roofing job to a professional who, in my assessment did a good job.
A short time after the project was completed, I noted water weeping from beneath the column clad boards which were not joined to their column bases and concluded that this was the result of condensation. (Note that we live in hot, humid Louisiana.) Upon this discovery, I caulked the ⅛ ˝ openings I’d left to prevent rot caused by contact. I’ve now concluded that was a mistake because, over time, the clad boards began to split and degrade.
My son and I dismantled one column today (08/02/14) and found that the whole lower portions of the core supports and clad boards had rotted away. There were no visible signs of water damage or flow above the rotted sections, so the roofing job does not appear to be at fault. Therefore, I’ve concluded that my condensation theory may be correct, and if so, I acted the role of dunderhead by sealing the bottoms of the columns.
To correct this problem I’ve decided to redo the columns much as I’d done before, but drill vent-holes at the tops of each column to prevent condensation.
Does anyone agree with this theory and its remedy?
09 0929.porch roof completed01

David, Moderator

11:42PM | 08/03/14
Member Since: 11/15/13
262 lifetime posts
Sounds to me like the water might be getting in at the bottom and seeping up into the wood.


06:21AM | 08/04/14
Thanks for your response, David. The columns are set back 2 ft.from the porch roof edge, so while I think rising water may possibly be an issue, its probably is minimal at best. Splash from rain run-off could be a cause, but 2 of the 4 columns are situated in such a way so as to rule out splash as the problem. Additionally, when weep was first noticed we were smack-dab in the middle of a prolonged drought (2010) when there had been no rain for weeks.
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