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Question DetailsAsked on 8/4/2017

can we apply stucco over wood siding?

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1 Answer


Yes, with proper standoff and water barrier/housewrap. This assuming the wood is flat sheet siding. Here is a previous similar question about going over T1-11 siding (assuming it is in good shape).

Over particle board, fiberboard, OSB, etc - I would Definitely take it off - that junk should not be used anyway, in my opinion and in an existing wall very commonly is partially or badly deteriorated anyway. Article on that issue here:

If you mean over lap siding, where the siding strips overlap each other so there would be a 3/4" gap right below each lap I would say that falls in the category of a very bad idea. Not only will there be big strip gaps under it (assuming the wall is firred out to a planar surface with firring strips and mesh to provide a "flat" surface), but your lath will be unfastened except at the bottom edges of the boards and will likely be weak and wavy unless 1x material, plus you are talking an additional 1-1/5: thickness so a big stickout at windows and doors, which will be a complex thing to flash out and waterproof. Will require basically "brickmold" type flashing and trim like on thick-wall brick houses where the doors and windows are recessed into the thick brick wall on the outside surface.

Personally, especially since lap siding comes of real quick, go with the probably $1/SF or so additional cost of tearing it off and starting from bare studwall if you want to go to stucco.

Course, you could go with one contractor I saw on a job (thankfully not one I was involved with) - he got it with very low bid, and was plain why he was so low afterwards. He just sprayed the stucco direct onto the wood (no gap, no water barrier, no mesh) at uniform thickness - so the finish stucco surface "reflected" the underlying lap siding in a rounded-off way, so it looked like a bunch of waves in the stucco. Actually looked sort of artistic with the fuscia paint the homeowner chose to paint it afterwards - but REAL hokey looking and caused a lot of laughs in the building community for a couple of years till the next owner tore it off and did it right as it started peeling off. (Took a couple of years to start peeling off because was in a near-desert environment - in a wetter environment I doubt it would have lasted 6 months).

Answered 3 years ago by LCD

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