It's a possibility that some manufacturers may instruct removal of the layer beneath which would leave you out of luck.1511.3.1.1-3: recovering is NOT permitted where the existing roof has two or more applications of any type of roof covering.

I manage someone's STR in Austin and a mother kitten got into their crawl space and gave birth beneath the house to 6 kittens.

According to Fannie Mae Guidelines, the minimum mid Fico score needed to purchase my 7th through 10th investment property is 720 and my mid score is nowjust beneath that.I need a Portfolio Lender to help me buy additional investment properties in the Huntsville / Madison County Alabama area. 

You wouldn't want your long term tenant beneath one with possibly noisy people from an airbnb.Or live in one side and rent out the other.  

The challenging part is that I have an access to this spot only from the basement - so I need something like spray or very sticky that will stick even if we will apply it from beneath

All in all, I probably spent a year learning and living beneath my means before making the first investment.It's scary.

The cat smell is very strong in the common areas--front and rear stair wells and laundry room directly beneath her unit.

Antonio,Yes - there are more bad deals than good deals.Having said that, you also need to look beneath the surface to see if you can find the good in "seemingly bad deals".For example...1.

It should take a contractor no more than an hour to remove a wood window and shim / install / caulk a new one.  

It's just more real when it's tangible, right beneath your feet.