Would anyone recommend keeping my personal umbrella as another layer of safety?

I agree with Jeffrey's post, it will create a double layer if you run into litigation issues in the future.

I would layer on top of that strategy renting out extra rooms. 

DO NOT GRIND ON A FIRE SAFE WITHOUT A GOOD DUST MASK.  

As I know there are many layers to investing, and construction only being a small part of it.

As in we paid for a tear-off but they layered it on.

Masked volatility is still volatility - you and I just don't get to see it. 

Each unit is 1 bd 1 bth, has a sun porch, and a detached garage stall that goes with.The building is about 2600 Sqft, and needs a new roof (it would be a 3 layer tear-off, 2 layers of shingles and 1 layer of cedar).

So if you're looking at a property in a town, you will have two layers of local tax.  

It gives you a layer of separation from your tenants and makes confrontations easier and it's less likely that tenants will take advantage of you or appeal to your emotions.