Posted by bc on November 03, 2009 at 10:41:31 from (69.148.145.104):
In Reply to: Installing duct work posted by TimMiller on November 01, 2009 at 21:10:21:
Hi Tim. What T-Bone said.
As I reread your post, it appears you are adding a large addition on to the house. It also appears you are wanting to add on to the end of the existing system. Is that all correct?
If that is the case, it won't work without replacing and resizing the air handler, plenum, and all main ducting including the returns. I don't thing any existing system can handle a 5 room increase. You can probably keep the end run ducts in the original part of the the house. One of the tricks is maintaining the right flow and right pressure.
Just as well start getting bids from the pros for the whole system. And to get the rough in details right, you better start doing that before you start laying down joists and preferably have a set of plans before you even start building. I'm not sure any quality building contractor would work without some plans to lay out the foundation and on up. He has to know where all the plumbing and electrical is going as well. You can't run a duct through a drain pipe or some romex and vice versa. If one of those rooms is a bathroom, then you have lots of design issues to deal with.
Depending upon the brand of air handler and system you prefer, you can discuss the bids with the HVAC companies. Then you can negotiate with them on doing a turn key job or how much you are going to DIY. If you are going to home cheapo or lowest and buying everything, then you can ask them to price out the design. Think about a hepa or electronic air cleaner and humidifier as well.
Besides sizing a placing ducts and registers, another trick to flow design is getting the returns properly sized and located to run through and stud wall and floor joist cavities and then have it all get to the main return ducting. I have one bedroom at the end of my pro designed system that just doesn't get the air flow like the others. Always cold in the winter. Pinching down the other registers doesn't help. Guess I'll try the tissue test on the return duct although I've done it before. For all I know, they may have forgot to cut off that part of the bottom plate or cut the hole in the floor.
Good luck Tim. I don't mean to write a book here or offend the readers that only want simplistic and direct answers when the question doesn't have such an answer.
As an aside, I'm in the middle of the project from heck (or Oklahoma, same difference). What started as new vinyl siding and some windows for my mother in law's almost 100 year old farm home has grown. Tore off 3 layers of siding and replaced 1 door and 1 sliding patio door. Found some termite damage and have replaced about 25' of stud wall and sheeting. Got half of the 26' of the north end torn off including the lath and plaster interior walls this last weekend and next weekend will replace the new stud wall along with a set of french patio doors. Have it boxed in with plywood and tarps for now. Then do the other half of the north end. Have ordered all new new construction style windows that will require every window being removed and reframed for the new ones. Since I'm going that far, I just as well pull off the remaining 1 by 6 sheeting and replace all the sheeting and insulation while I'm at it. Replaced the galvanized plumbing in the kitchen wall and all new wiring per code along with a new panel in the basement when I'm done. I hoped to have a siding party at Thanksgiving but it may be Christmas now.
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