Working with existing materials, conditions and other legacy elements can definitely be more work than getting a bulldozer to clear the site.

-Mass/Density of materials used is very important and sealing penetrations is as well-absolutely 5/8 drywall- if possible 2 layers with "green glue" or "quiet glue" sandwiched in between. you can buy quiet rock not sure of its fire rating so maybe only to be used in conjunction WITH fire rated drywall -drywall should be cut TIGHT to floor adj walls and ceilings. sound caulking should be used at all edges and seams and penetrations.

Hi everyone,First I really thank you all in advance and appreciate your time and sharing experiences and ideas that I know that came from hard work and time that worth more then money it self, much appreciated.As invistor and doing house fliping as a main job I really want to know what are my rights with general contractors.1- can I ask them to give me receipts on materials they buy ?

We went way over budget in hard money interest, labor and materials costs due being shut down for a month after the contractor did not pull the permits that he said were pulled.

A builder has carrying cost for land, material payments and labor expense - on top of that the building is not usable during construction.  

If you are going to play this game you must know material costs and what a job is worth.

If it works out this month I'll try a second set for $1600-2800https://www.lowes.com/pd/Whirlpool-7-4-cu-ft-Gas-Commercial-Dryer-White/1000822858Example from LOWESUnfortunately no reviews, but it has a 2 year material and 90 day labor warranty. 

I will have to evict/not renew month to month lease for the tenants so that will give me 60 days to gather materials for my contractor and try to get some sales/discounts on stuff.  

I'm using 0% CCs for all DIY materials and personal expenses too keep cash for roof and contractors (20k). 

I recently translated my marketing materials to Spanish as well.The house was built in 2015 and is in a new construction subdivision.