It could be an easy fix like painting the walls with a waterproofing membrane, or it could require a more serious foundation repair.

The higher bids include creating a slight slope using varying thicknesses of insulation under the membrane.We've encountered a few different options in the quotes:Reinforced EPDM vs. 60 mil membrane: One roofer suggested reinforced EPDM for superior puncture resistance, while others argue that upgrading from a 45 mil to a 60 mil membrane is sufficient for occasional foot traffic (for inspections), falling debris, and hail.Attachment methods: Some roofers propose mechanical attachment (especially for reinforced EPDM), while others prefer an adhesive method.We're seeking advice from anyone with experience in EPDM roof installations.

If we budget waterproofing (membrane) for the crawlspace and accept that the treatment was done (with a bond) and the repairs completed (photos provided), what would your thoughts be on proceeding with the purchase? 

Consider adding a sump pump or waterproof membrane if needed.2.

What do investors use for the moisture membrane(s)? 

We recently had a flip where the membrane over the garage was leaking on the north edge, water migrated back about 15' before finding an opening in the decking and dropping through to an interior hallway.

. $1,520.00•Demo about 12” of walls and rip out entire shower pan and step •Install cement board on exposed wall •Apply RedGuard and Waterproof membrane to shower pan and up the exposed walls •Install new drain adapter in shower floor •Install new tiles provided by client Optional (just in case fixing shower pan does not fix the water leak) rebuild shower. costs extra $5100•Demo shower • New plumbing for a new fixture •Install cement board on exposed wall •Apply RedGuard and Waterproof membrane to shower pan and up the exposed walls •Install new drain adapter in shower floor •Install new tiles provided by client •Client provides plumbing fixture

If only the outer roof covering (membrane, shingles, etc.) was replaced but none of the underlying roof system, it is not a restoration and you can expense these costs.  

Is the membrane secured to the parapet wall correctly?

.- Additional subfloor (wood) and cement board (floor) $100- Shower cement board $75- Waterproofing Membrane (I like to do this) $150- Shower wall tile (80-90 SF) $150- Flooring tile (30-40 SF) $100- Tile setting and grout $75- Vanity with top and mirror (24" it looks) $250- Toilet, wax ring and feed line $100- Faucet, feed lines and trap $75- Trim $25- Accessories $40- Fan/light $150- Vanity Light $50- *Shower diverter valve with trim kit and plumber to install and help set tub/drain. $750- Screws, adhesives and fasteners (cement board screws, caulk, etc) $50- Paint $40- Miscellaneous $100TOTAL: $2530With all of that said these numbers would be my BASE run, and assuming I was spending my budget amount on each item.