Why do you use marine grade plywood instead of OSB or structurewood?
“OSB” and “structurewood” are made of large chips of wood recaptured and covered in a formaldehyde-based epoxy. Many people are allergic to formaldehyde and although this product is available in 30 foot long sheets do not hold up well when exposed to moisture. Once a hole is made in the sheet to accommodate water, sewer or electrical lines, there is an opportunity for water to penetrate the board. When wet, these products will swell and crumble. Our competitors also brag about a 25-year warranty on this product. What they don’t mention is the warranty covers replacement of material, not the labor or shipping to replace it. Plywood, when wet, will retain its strength and shape because it is made of layers of large sheets of wood. All floors are tongue and groove plywood, essentially eliminating weak areas at the seams.
