Trying to work no money down deals in the current market seems like a pipe dream.Best of luck!

Once I learned that end I saved a lot of money from needing to pay a technician to replace exhaust fan motors of relays.You can learn how to do roofs by reading the wrapping paper on any bundle of shingles, or you might be able to find an article called "your roof, for heaven's sake" which was published about 25 years ago by a California property owners' association.

What I personally found to be really ugly by the way was the 20,000 gallons of crude that leaked from a broken pipe in a local canyon in SoCal - one of countless such leaks across the country.

As @Cara Lonsdale pointed out, my mortgage company doesn't cut me a break when the furnace goes out or a water pipe busts.

He went through exhaustive analysis and concluded that he needed to sell over 100 houses within 6 months.

But most of our piping is exposed in a basement.

This will allow sewer smell to come up through the pipes into the bathroom. 

The roof company came to fix it for many times but still leaking and then we were told that is the sweating of duct piping.

If he has proof that you duct taped a pipe for instance to stop it leaking....

A really good rule of thumb is $20-25 a square foot for rehab, then add costs for roofs, 3-5k, hvac 3-3.5 k, blow pipes, 1,500-2,000, foundation 1-30k (harder to determine when starting, but you can have guys give bids).