That depends on the specifics. For example, if you do not know any better and you ask the drywall to be installed before the lathe (this is the paper and wire used in the first step of exterior stucco) then when the lathe is installed, the vibration from the nails being installed to hold the lathe in place can actually loosen the drywall either enough that it must be re-installed (extra cost) or less but enough that over time drywall failure will take place (even more extra cost). However, rushing to have the lathe installed as soon as you can might also be a mistake. The paper on the lathe wears when it is exposed to sunlight. If enough time passes, the paper can become brittle and crack when the scratch coat (the next step in a stucco finish) is applied. A not so careful stucco crew might not point this out (especially since they do not want you to make them remove and replace the paper at their expense) and simply install the stucco coat over the partially failing paper. We have actually seen the end result of this many times and the cost to fix is very substantial. So much so, that most clients for whom this problem develops leave the defective paper in place and we simply coat the exterior of the building with a water resistant coating to provide a temporary fix. (The paper is actually what keeps the building from water intrusion not the stucco).
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