Trailers, quonsets, campers and other temporary structures may be placed on a lot, for a period not exceeding six months, after the dwelling on the lot has been rendered uninhabitable by wind, storm, fire, explosion or other destructive occurrence, or while a new single family dwelling is being constructed on the lot after the removal of a prior dwelling, for use as shelter or storage during which the main dwelling on the lot is being repaired, restored or constructed. This section shall not apply to the storage of recreational boats, trailers and campers which is regulated by subsection 13-5.21.