Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > HVAC

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 09-30-2011, 07:53 PM   #1
DIY'er
 
Join Date: Jan 2011
Location: Western PA
Posts: 5
Rewards Points: 10
Default

Supply ducts to second floor


I purchased an old farmhouse that has no heat to the second floor, gas forced air to the first. The heating system is new and has a 26 x 10 ductboard trunkline running under and perpendicular to the joists in the basement, flex duct to first floor registers. The heating contractor who installed it assures me the system was installed with the capacity to take on the second floor.

I would like to consider doing this myself. I've got fairly extensive remodelly experience and feel up to the challenge but must admit I have never done anything in HVAC save for adding a takeoff and flex duct to an existing system.

My question posed to smarter folks than myself is can I build a vertical run off a main trunk to a distribution box and then run three round branch ducts off of it? More details follow.

At first glance I thought it would be fairly easy to run flex or round metal supply air duct to the second floor because, during the course of the renovation, I've removed the first floor ceilings, providing access to the joists under the second floor. However, it has become apparent that the only reasonable access from the basement to those joists is through a closet where I can garner about 21" x 7" of useable duct space.

I have access to a ductboard cutting machine and am wondering if I can construct a branch line such that it would connect to the top of the trunk, travel approximately 2 feet between the basement joists to a point where it would turn vertical and move up the closet space to a larger dead space at the top of the closet. I would then run three duct lines off a distribution box at the top of this branch to the rooms on the second floor. They are two small rooms (7" round) and a small bath (6" round).

Would this approach work? I don't have any alternative clear paths to the second floor except for this 21 x 7 inch closet space. Many thanks!


Last edited by cekrauss; 09-30-2011 at 07:56 PM.
cekrauss is offline   Reply With Quote
Old 09-30-2011, 08:39 PM   #2
An old Tradesmen
 
Join Date: Oct 2008
Location: PA
Posts: 26,070
Rewards Points: 3,804
Default

Supply ducts to second floor


Won't get much air through a duct board trunk that is ran in between the joist. Unless you made it 10" deep. Also, the 26X10 trunk you would be connecting to would need to be made bigger, so as not to rob air from the first floor. Probably about 10X30. I'm guessing your giving outside dimensions, and that your duct board is 1" thick, that what I based my sizing on.

beenthere is online now   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Creating a flat floor on an angled concrete floor? Magno Building & Construction 1 04-14-2011 06:42 AM
A good solution to 2nd floor heating problems ? etienne HVAC 14 03-16-2011 02:48 AM
Cupping red oak floor rocks911 Flooring 9 02-10-2011 01:42 AM
Ac supply and return 2nd floor ramiro1963 HVAC 1 12-27-2009 09:58 PM
Carpet in the basement Packer Backer Flooring 16 11-04-2008 12:19 AM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.