We are turning a contiguous porch on the second floor of our house into a room. It has a hip roof which is contiguous with the main roof.
Dimensions are 12' x 24'.
The floor as it exists currently: 2 x 12s 16'' o.c.; 1 1/4" plywood glued and screwed. Many coats of butyl rubber coating which was rolled on in liquid form. The floor is in perfect shape with no squeaks! A slope of app 2" from one long side the the next. We do not plan on removing any of the existing floor.
We are amenable to all types of finished floor: carpet, tile, hardwood. Complicating factors: 3' entry to room is at high point of floor; there is a waterproof barrier at the top as the floor now exists.
1. Use one of the liquid floor levelers. Questions: will it bond to the butyl coating? Does it need to bond? Can it be "feathered to nothing". What brands/types are best? Will they fill 2" without too much shrinkage? I suspect that this would limit finished floor to tile or wood or laminate?
2. Cut ends of 2x lumber with a chop saw & install, one piece at a time, cutting each piece to fit & gluing one piece at a time to existing floor. Sand, stain & poly to attain finished floor. This would negate the need for a leveling material, but it would be very tedious measuring & cutting each piece. Any thoughts?