I've also read that you should put down floor underlayment regardless of the type of plank you buy, is that also true?

It is very common to have two layers of roofing, although I'm not sure installing a comp roof over a metal roof is a best practice.

Its easy to install (reducing labor costs) and really affordable depending on the wear layer thickness and brand.

I didn't fall under specific laws. 

Roofing felt orSynthetic underlayment orIce & water shield (less common for patios unless in cold/rainy climates)Material cost: about $0.50 to $1.00 per sq ftInstalled cost: around $100–$200 Rafter replacement will likely run about $15 to $25 per square foot, which puts you in the range of $1,125 to $1,875.

It isn't something that I would normally go with unless I had 5 or more properties but with the partnership, it could add a layer of security.Make sure you have the insurance correct.

I’m looking to focus on flipping and the BRRRR strategy, but I’m doing this remotely and out of state, which adds an extra layer of pressure.

That’s a whole extra business layer, even if you’re “just” using it for yourself.

Hi Guys,I am currently under contract on a duplex in Sacramento CA - the unit was built in 1973 and I wanted to make sure that I am doing my due diligence with ensuring that the condition of the property is up to standard.

Quote from @Rodrigo Hernandez: Hi all,I’m looking for some guidance here as I have a property that’s under my name and a multi-partner LLC with friends.