It says in SA Siman 638 that one may make a tanai (condition) on the "noi sukkah" (sukkah decorations) in order he should be able to use it during the chag and that it won't become muktzeh l'mitzvaso (set aside for the mitzva). In theory could one do this with the scach as well (so that it won't become muktzeh and the person will be able to be move it in a regular manner). If not, what is the reason why?
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It continues with an explanation, plus some extra details for other situations (in particular for the walls), but it's too much to type out.