Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Roofing/Siding

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

Reply
 
Thread Tools Search this Thread Display Modes
Old 08-15-2012, 09:52 AM   #16
Exterior Construction
 
Windows on Wash's Avatar
 
Join Date: Aug 2011
Location: VA, MD, DC
Posts: 5,530
Share |
Default

venting with no horizontal roof line


Quote:
Originally Posted by AGWhitehouse View Post
This product cannot be used here as the roof is a true frame gable system. The rafter bays all terminate into the vally beam.
Hot mess from a venting standpoint.

Best bet for equal distribution is probably over deck at this point AGW?

Windows on Wash is online now   Reply With Quote
Old 08-15-2012, 10:23 AM   #17
Member
 
Join Date: Dec 2011
Location: Catawba, VA
Posts: 68
Default

venting with no horizontal roof line


I do like above the deck ventilation but it won't though do anything to help the OP's original problem of venting the moisture he has between his ceiling and the original roof deck.

Also, with the above deck ventilation accessing proper intake is still a problem unless your are considering pulling air from the rakes.

Regarding the SmartVent,

I haven't installed the SmartVent product in a valley situation, but I am not sure why you are saying it wouldn't work, (maybe I am missing something obvious). The intake holes are 6.5" up from the center of the valley. My problem with the product is can it pull enough air for all the rafter bays from 1 small opening at the bottom of the valley to be effective. Maybe it is better than nothing though.

I have a contact at SmartVent, I will call and ask their opinion and report back.
roofnron is offline   Reply With Quote
Old 08-15-2012, 12:02 PM   #18
Member
 
AGWhitehouse's Avatar
 
Join Date: Jul 2011
Posts: 1,378
Default

venting with no horizontal roof line


Quote:
Originally Posted by Windows on Wash View Post
Best bet for equal distribution is probably over deck at this point AGW?
Yep, continuous ridge vents at the ridges and intake opening within 3' or so of the valley discharge. That will give enough vertical distance for passive convection. Problem with this approach is the expense. You'll be re-roofing and it would be best to move the insulating envelope to the underside of the roof. Quite an undertaking.

If the budget is tight, I still feel that the sidewall louvers and mechanical ventilation is the best option. It doesn't require messing with the roof and it shouldn't require much additional insulation work. Just need to find the "trouble" areas, ensure air sealing and thoroughness of the insulative envelope, and install the louvers. The whole job could theorectically be done in a weekend, providing what I'm picturing as existing actually is existing.
__________________
Life's too short...so enjoy it!
AGWhitehouse is offline   Reply With Quote
Old 08-15-2012, 12:12 PM   #19
Member
 
AGWhitehouse's Avatar
 
Join Date: Jul 2011
Posts: 1,378
Default

venting with no horizontal roof line


Here's a graphic to display my description:

The dashed lines are the roof extents, ridges, and valley lines

The white solid lines are the exterior walls and potential knee walls (i'm assuming they all exist as the space was noted to be finished

The cyan linework are the louver locations. The exhaust would be location of the power fan, which could either be solar activated or tied to the electrical service, though this may require additional wiring. If you can ensure a vertical dimension of 3'-0" between the intake and exhaust louvers (exhaust higher) then you won't need to provide a mechanical fan.

__________________
Life's too short...so enjoy it!

Last edited by AGWhitehouse; 06-19-2013 at 02:59 PM.
AGWhitehouse is offline   Reply With Quote
The Following User Says Thank You to AGWhitehouse For This Useful Post:
Windows on Wash (08-15-2012)
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
Not venting a metal roof. maestro Building & Construction 16 12-13-2011 02:31 AM
venting an existing shed type roof. organick Roofing/Siding 2 12-17-2010 09:05 PM
Can a roof vent identify where my main sewer line exits the house? YerDugliness Plumbing 8 01-26-2010 04:13 PM
Roof Venting Issue, crawlspace supton Roofing/Siding 1 11-12-2008 06:44 AM
Flat roof questions, advice, ballpark estimate JerryH Roofing/Siding 18 11-07-2008 04:08 PM




Top of Page | View New Posts

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