Proper venting literature

 
Thread Tools Search this Thread Display Modes
Old 05-10-2013, 06:30 PM   #1
Software Developer
 
AnyMonkey's Avatar
 
Trade: Roof Estimator
Join Date: Nov 2012
Posts: 161
Send a message via Skype™ to AnyMonkey
Default

Proper venting literature


I just had an interesting chat with a colleague at work here regarding installing ridge vents on an existing complex. He advised me that he was going to leave in the existing air vents and install the ridge vents as well. i told him this was wrong and he needed to take out the standard attic vents first and he did not agree. Although I am pretty sure my thoughts on this are right because of competing airflow problems I do not know where to look for literature on this. If anyone has a link it would be helpful.

Ken

Advertisement

AnyMonkey is offline  
Warning: The topics covered on this site include activities in which there exists the potential for serious injury or death. RoofingTalk.com DOES NOT guarantee the accuracy or completeness of any information contained on this site. Always use proper safety precaution and reference reliable outside sources before attempting any construction or remodeling task!

Old 05-13-2013, 08:08 AM   #2
Senior Member
 
shazapple's Avatar
 
Trade: Project Manager
Join Date: Dec 2010
Location: Atlantic Canada
Posts: 214
Default

Re: Proper venting literature


Depends on the size of the building. I've done some larger roofs where a typical ridge vent isn't enough and required a couple extra exhaust vents to make up the proper ratio and balance. In our local code it is identified as 1:300 vent ratio and splitting the venting between the top and bottom 50/50 ideally (maximum 25/75 one way or the other). As to where the code gets these numbers, I have no idea.

This is of course assuming there are soffit vents. If not, then the ridge or exhaust vents are essentially useless.
shazapple is offline  
Old 05-13-2013, 02:13 PM   #3
Software Developer
 
AnyMonkey's Avatar
 
Trade: Roof Estimator
Join Date: Nov 2012
Posts: 161
Send a message via Skype™ to AnyMonkey
Default

Re: Proper venting literature


Quote:
Originally Posted by shazapple View Post
Depends on the size of the building. I've done some larger roofs where a typical ridge vent isn't enough and required a couple extra exhaust vents to make up the proper ratio and balance. In our local code it is identified as 1:300 vent ratio and splitting the venting between the top and bottom 50/50 ideally (maximum 25/75 one way or the other). As to where the code gets these numbers, I have no idea.

This is of course assuming there are soffit vents. If not, then the ridge or exhaust vents are essentially useless.

I understand that sometimes you need standard vents at different areas of the home that can not be serviced by the ridge vents..... but I am talking about af 50s on the same area as the ridge vent..... anyone?
AnyMonkey is offline  
Old 05-14-2013, 08:30 AM   #4
Senior Member
 
shazapple's Avatar
 
Trade: Project Manager
Join Date: Dec 2010
Location: Atlantic Canada
Posts: 214
Default

Re: Proper venting literature


I don't think the addition of square exhaust vents beside a ridge vent will short circuit everything; as long as there are soffit vents the hot air will still rise.

Are the extra vents necessary? Not unless you have a very large building. If the building is wide enough from soffit to soffit, a 18sqin NFVA ridge vent isn't going to satisfy your requirements. If the building is small enough, the extra vents will throw off your 25/75 ratio.

I have had additional square vents installed along with a ridge vent in the past. The building was almost 80 feet from soffit to soffit, so the typical ridge vent wouldn't satisfy the venting requirements.
shazapple is offline  
Old 05-16-2013, 10:34 AM   #5
Roofing Relapse
 
Grumpy's Avatar
 
Join Date: Oct 2008
Location: Chicago, IL
Posts: 2,559
Default

Re: Proper venting literature


go to airvent.com
__________________
Thomas


http://www.illinoisroofinspections.com
Grumpy is offline  
Old 05-17-2013, 07:19 AM   #6
Junior Member
 
carlnwo's Avatar
 
Trade: Roofing Contractors
Join Date: Feb 2013
Location: Liverpool
Posts: 21
Default

Re: Proper venting literature


Yea airvent.com has some good info for you, they even have a support email address where you can send your query in and they will answer (just make out your thinking about purchasing the vents from them).
carlnwo is offline  

Tags
literature, proper, venting


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
Venting with vaulted ceilings problem mixer Ventilation Problems, Solutions And Theory 15 03-14-2013 04:09 AM
IRC on venting Pie in the Sky Ventilation Problems, Solutions And Theory 9 02-13-2013 09:17 AM
EPDM rubber venting questions moveinmaryland Residential Roofing 2 12-17-2012 06:49 PM
Doing Business - Legal & Proper & In Writing. CrappieMan General Roofing Discussion 7 04-28-2010 10:59 AM
Mansard roof venting user182 Ventilation Problems, Solutions And Theory 7 04-28-2009 03:46 PM

Join Now... It's Fast and FREE!

Privacy Badge
I am a professional contractor
I am a DIY Homeowner
ContractorTalk.com is for
PROFESSIONAL CONTRACTORS ONLY!

At ContractorTalk.com we cater exlusivly to professional contractors who make their living as a contractor. Knowing that many homeowners and DIYers are looking for a community to call home, we've created www.DIYChatroom.com DIY Chatroom is full of helpful advices and perfect for DIY homeowners.

Redirecing in 10 seconds
No Thanks
terms of service

Already Have an Account?


Content Relevant URLs by vBSEO 3.6.1