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Question DetailsAsked on 6/18/2013

Can you put stucco over existing wood siding?

We live in Florida and are getting conflicting answers to this. There is currently T111 and we need to do something. I am also concerned about vinyl.

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1 Answer


I presume you do not like the T-111, because if it needs replacement, using T-111 or similar modern (NOT masonite or particle board) sheet product would usually be quite a bit cheaper than stucco - roughly half, I would guess.

Here is a link to an article about the problems of stucco directly over wood sheathing -

Generally speaking, you need an air gap COMMUNICATING top to bottom through the wall, so lath or ridged foamboard placed under the stucco has to have vertical air slots or gaps. You also HAVE to have a water-resistant material (housewrap) under the lath or wire mesh, because stucco is pretty moisture permeable - rainwater soaks it pretty fast, so underlying wood gets damp - hence, the rot problem. Placing stucco over wood sheathing is generally not considered good practice, though an awful lot of contractors do it. A better solution is removing the sheathing, placing lath or rigid foamboard insulation, then housewrap, then the wire bonding layer, then the stucco.

Another problem with adding stucco over existing siding or exterior finish sheathing like T-111 is you are adding about 3/4-1 inch new thickness, which then sticks out beyond your window and door frames, causing sealing and drainage and aesthetic issues.

Google the following search term for more info on the issue - stucco over wood siding

The vinyl siding issue was discussed recently on this forum - here is the link -

Answered 7 years ago by LCD

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