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Question DetailsAsked on 6/27/2016

Best Hardie Plank installer in Park City, UT?

Thinking of covering Hardie Plank over stucco home, Anyone else have success?

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2 Answers

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You can check in the Home > Siding link in Browse Projects, at lower left, to look for any prior similar questions with answers - I recall maybe one about covering stucco with concrete plank. Or you could put Stucco into the Ask box and see what comes up - might pop that question link there.


For contractors, unless there happens to be a comment in a review for one or more of them, not likely to get any details on previous experience with hardiplank over stucco in the vendor info. Siding would be the Search the List category for siding contractors to put the plank on.


As far as putting plank over stucco - there are a lot of stucco mixes out there - from pure portland cement (as a sprayed-on gunite commonly) to ones high in lime and/or gypsum - the difference is portland is waterproof (in that getting it wet does not hurt it - not that it does not readily pass water vapor). Put plank over a lime or gypsum-based stucco and get condensation or blow-in or leakage under/past the plank and you can get a soggy mess. I remember one job where we were tearing wood sheet siding off a house (which would normally evaporate moisture pretty well, relatively speaking) and the stucco underneath was literally peeling off the screening and dripping onto the ground like a very thick batter - it had basically gone to mush due to long-term accumulation of water. And the gypsum/lime absorb moisture - so it does not have to be direct wetting, can just be taken up from high moisture content passing into or through the walls.


The normal recommendation is basically not to cover over high lime or gypsum content stucco with anything other than protective paint, and other high-cement content stucco to leave a ventilation passage over the stucco and behind the siding - normally firring strips (thick enough for proper gapping and sometimes also used as the fastening base for the siding) leaving continuous vertical air gaps behind the siding (with appropriate bug screening top and bottom and protection against rain entry at the top if not covered by a roof overhang) with water barrier over that (type and vapor permeability depending on house design and local weather conditions - may be low-permeability or a vapor-transmissible housewrap depending on wall design) then the siding. If putting insulation under the siding or insulation-backed siding (as might well be the case in your area) that complicates matters because it is largely a vapor barrier in itself, so great care needs to be taken to avoid multiple vapor barriers in the protected wall space that could trap moisture. How it is handled, and whether it is reasonable to do that at all in your area, is something an insulation expert or architect should address.


One other consideration which might be a deciding factor all by itself - the stucco probably comes to the proper point for window trim/facade, so putting plank over that (which is quite thick) is going to mean the siding probably comes at least to the front of the existing window frame/trim if not beyond it, so proper flashing the trimming out is likelyu to be a major hassle if you are not replacing windows at the same time. This is a VERY common issue when putting new siding over old, and commonly ends up looking quite bad and sometimes causes major problems with wataer intrusion around the windows. For instance, assuming your stucco has some texture or roughness to it, putting new flashing and water barrier around the windows runs the risk of some water getting down behind it due to the stucco roughness - so either requires a lot more labor scraping/sanding the stucco smooth and planar around the doors and windows, or you might end up with a future water issue because of it - not something I would voluntarily risk considering the probably less than 10% additional cost to remove the stucco first.


My recommendation - both because many stucco walls are not perfectly flat so can reflect through as irregularities like waves in the siding, and because of the above issues, is generally NOT to leave stucco under other wall finishes - not that expensive to remove it and start with a clean studwall to build up your siding materials layers.

Answered 2 years ago by LCD

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Hi,

This is James in Member Care. Thanks for your interest in Angie's List!

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Answered 2 years ago by Member Services




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