We did one where the 1987 OSB they used for flooring was too thin & sagged between the joists.I used the same leveling compound they use for tile work laid a heavy pad & carpeted over the floors.The foyer & hallway we just tiled after the same leveling.If the joists have sagged it's a lot more work ESP if the flooring is the old tongue in groove pine with a subfloor on top.But one of my friends many years ago used Fiber glass shards & resin to fill the voids, but he got it as waste product from the place he worked so it was minimal cost, but it seemed like a lot of work.Good luck

I was picturing a roof deck with fiberglass floor with your first description.

If there is a shower vs tub are you putting in a fiberglass pan or tile?

It was white.74 Detomaso Pantera23 bucket T with corvette 327 (fiberglass)23 bucket T with corvette 427 (actual METAL body!)

Did you tiled shower, or was it fiberglass insert etc.

Live in Gig Harbor Washington, and work full time in Tacoma managing Codel Entry Systems, a Wholesale Distributor of exterior steel & fiberglass doors, that are sold through Lumber Yards, Home Centers, and Door Shops throughout the Pacific Northwest.Enjoy investing in real estate.

3) Medium grey wood-grained Waterproof vinyl flooring (WVF) throughout, with brushed nickel light fixtures and hardware, or Coffee wood-grained WVF with Oil-rubbed bronze light fixtures and hardware4) Keep the master-bath shower as it is, which is a medium blue fiberglass, and just replace the door with a modern one and trim in some coordinating hardware and glass tile, or totally tear out the shower?

If it's a fiberglass tub/surround, it might be worth replacing as the difference between that repair (because of the labor hours involved) and replacement could be negligible.Another thing to consider - water does not leak straight down.

We did one this year where we did R-50 attic blown in fiberglass.

In a few of our historic homes we refinished the hardwood floors in the living room, hallway, and bedrooms and keep those original.For tubs and surrounds, we prefer a porcelain or ceramic covered steel tubs or fiberglass.