You might be able to apply a class-2 waterproof membrane to the top-side of the roof deck before laying the roofing (shingle, steel, etc) to ensure the roof deck never becomes wet - unfortunately, this opportunity seldom presents itself in a renovation. 

It needs a good $5-8K to make it what I like to deal with which usually means new floor coverings, paint, windows, some shingle repair or replace, skirting, maybe some cabinets.  

I still have a old shingle cutter for them .  

This is same as replacing Roof or repairing few shingles. 

Hi BP Community, I just purchased a foreclosure in Walton, Upstate NY as a getaway from NYC and while I knew the roof needed to be fixed, I just found out that some areas of the roof need to be entirely replaced as they have a very low pitch and currently have shingles (Not sure why they did that in the first place). 

. #1 they remove the shingles they drilled through and replace them, leaving miscolored shingles that stick out like sore thumbs all over the roof #2 they cover the holes in silicone and insist they'll be waterproof, in a couple years they'll leak and the owner will have to replace the roof anyways.

Though, shingle ones will require more maintenance.

This is a brief summary of what the property needs:Exterior:remove old roof and replace with new one (Shingles/asphalt)Some serious landscaping (Removing plants, trimming tree branches etc)Partial Painting (Brick/Aluminium siding)New garage doorInterior:Install drywall in the lower level of the house (it's a split level house)PaintingDemo wall between kitchen and living room to make it an open layoutRemodel 2 bathrooms (Tiling, new countertops etc)Panting kitchen cabintes and install hardware, new appliances, tile, and new countertops.Installing carpet on the family room and basementReplace closet/bedroom doors and trimReplacing and installing outlets/switches New water heater Install laminate The total project costs came at 67K (including an 11 % fee or 6,700 the contractor is charging me for running the project).

The bundles really have gotten heavier over the last 15 years because I always use "archetectural" grade (dimensional) shingles and they used to be 4 bundles per square, now they're 3/square just like 3 tabs.I have bought some "odd lots" off of Craigslist (they now have a "material" classification), and turned down 10 squares once (at $8.00/square) because the bundle wrapping material had deteriorated and it would've been a ****load of work to load them up and then get them onto the roof.

The spray foam cannot be done from the outside as apparently the shingles under the siding are asbestos?