The length of the wood screws is equal to the combined thickness of the floor and the marine plywood.
Replacing plywood floor in fiberglass boat.
Mix and apply fiberglass filler to eliminate any air gaps between the plywood and fiberglass and round off the edges of the plywood.
If the stringers and bulkheads are rotten get them replaced with fiberglass ones.
Step 1 remove the damaged flooring.
Start removing the old damaged material using an electric saw to cut it.
Photo d is a piece of plywood from the floor of a boat wreck.
Marine plywood is often used to build boat interiors and to replace flooring during boat renovations.
Set the repair patch in place and use the cordless drill to drive the screws and complete the repair patch.
The most common material used for boat flooring is bc plywood and it is also used for fiberglass boats in particular.
Note that even though the plywood has been snapped and left exposed to rain and wind it still holds its integrity.