What size concrete base is recommended for the pad mounted models? Anna2022-04-20T17:43:10+00:00December 14, 2021|Installation| The mounting bases are made from 7 gauge stainless steel. The diameter for the standard models and one-gang hinge tops is 8″; 8-1/2″ for the two-gang 5×5 models. Contact your design engineer, contractor, or building inspector for guidance. Share This Story, Choose Your Platform! FacebookTwitterRedditLinkedInTumblrPinterestEmail