after reading some of the post decided to pull out rooted floor on my 1974 aquasport my ? is the old floor looks to be 5/8 plywood with no cloth or mat "maybe thats why it rotted " i was thinking of dropping down to 1/2 inch or maybe even 3/8 plywood weight being a consideration.seeing as i am going to fiberglass it "not sure what type of fiberglass and what goes where would like some help on this subject i just took out the floor and left a 3 inch piece all the way around the deck deck measures about 5 ft. by 10 ft. thank you <br /><br /> from floorless in miami