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

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

Reply
 
Thread Tools Search this Thread Display Modes
Old 07-28-2011, 10:53 AM   #1
Newbie
 
Join Date: Jul 2011
Posts: 1
Share |
Default

spacing between rim joist vents


A low income weatherization program put floor insulation in my dad's house. After the fact I was informed we now needed more vents. I know the fomula and I come up with 4 and they say 7. The current vents are about 6-7 feet apart, house built 1953. Because of the floor joist, the vents will not be centered. With that some of the vents will be about 20 inches; apart. Will that spaceing compromise floor or house structure. If any thing I would allow 3-4 but not 7. The way the house is, because of addition, the venis would all be aded to two sides of the house. I am not interested in a vapor barrier. We live in mild weather in san jose CA I crawled under the house on a 98 degree day and the dirt was cold but dry and no moisture on baords. Not much rain in winter. If I would have had this information before hand I would not have allowed them to put the insulaiotn in the floor. Some advise just leave as is. Thank you Jude.


Last edited by jude morrison; 07-28-2011 at 11:02 AM. Reason: something different showed up in message
jude morrison is offline   Reply With Quote
Old 07-28-2011, 11:24 AM   #2
Residential Designer
 
AndyGump's Avatar
 
Join Date: Sep 2010
Location: Orange County CA.
Posts: 1,278
Send a message via Skype™ to AndyGump
Default

spacing between rim joist vents


By the CRC you need 1 sq. ft. for every 150 sq. ft. of crawl space.

But since you are not experiencing any moisture problems under there I would suggest putting in a few more vents as the new insulation might act as a bit of a vapor barrier not allowing the new moisture to escape as it may have done before having the insulation.

You are probably not required to pull a permit for the new insulation so you would not be subject to inspection by you B.D. In any case they would probably not require bringing the venting up to code. (possibly, not guaranteed)

Andy.

AndyGump 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
Crawl space vents -- joist cut out! Daler Building & Construction 16 10-23-2010 11:48 PM
Dryer duct hole thru band joist & floor joist justplumducky General DIY Discussions 12 10-05-2010 12:31 PM
Supporting joist under cracked tile JT31 Building & Construction 2 08-26-2010 08:00 AM
Floor Joist Spacing ERAUGrad04 Building & Construction 9 03-05-2010 07:10 PM
Joist spacing d78 Carpentry 1 08-31-2009 12:51 PM




Top of Page | View New Posts

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