@Michael IcbanIn Canada an investment property requires 20% or more down. 25% is becoming more common lately.

A house hack with zero money in is not very common. 

On flat roofs, commonly a foam iso board is installed and then the membrane over that.

@David UzhcaHi David, one of the most common ways to tap into your equity is to get a HELOC, a home equity line of credit.

The most common portfolio style loan in Texas is a 20 year adjustable rate loan.

Most commonly this is someone seasoned in the widget business, who just opened their own widget shop, and they aren't saddled with 15 layers of middle management, so the new business might not do as many units of widgets, but those widgets they do sell, the business reaps the profits that otherwise would have been paid out to useless middle management.

You can always refinance to pull cash out down the road, but maximizing cash flow is a very common goal.

not always but commonly

I just want to be savvy and knowledgeable enough to know when to jump on an opportunity when it arises.  

@Mitchell RustenAny common printer paper will work (20lb bond is typical).