Could Lack Of Soffit Venting Increase Indoor Negative Air Pressure? - Roofing/Siding - DIY Home Improvement | DIYChatroom

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


Thread Tools Display Modes
Old 03-07-2009, 09:32 AM   #1
Join Date: May 2008
Location: Rochester, NY
Posts: 211
Rewards Points: 156

Could lack of soffit venting increase indoor negative air pressure?

My windows are misbehaving with moisture and frosting around the sash and jamb and I think it may have something to do with increased negative indoor air pressure causing air infiltration around the weatherstripping. Indoor RH% is controlled with a dehumidifier and statys around mid 30's. No condensation is present on teh glass protion of any of the windows.

A window technician came out to check the windows that I installed and he said they were installed correctly. I live in Western NY where the winters get cold and at night when the temps dip the frosting is occuring. The windows that are misbehaving are the North and East facing ones. We have a gas forced air furnace and water heater, no fresh air instake. The house is a ranch built in late 60's, cedar sided.

The attic is approx. 1000 sq feet with 4 static roof vents, hooded, approx 1 square foot each. There is 1 square foot of total soffit venting. There is a total of R 38 of insulation in the attic with vapor barrier paper on the insulation. The North side of the roof, only, has frosting on the roofing nail tips where they protrude through the sheating.

The soffit venting I believe may be less than what I should have and I am curious if this will have an increased stack effect on the indoor air and pull more air through the ceiling to allow venting through the roof vents thus causing an increase in the negative air pressure? I opened a basement window cracked 1/8 open and there is a strong breeze blowing in the window quite constantly. Any ideas suggestions?



Last edited by creamaster; 03-07-2009 at 09:37 AM.
creamaster is offline   Reply With Quote
Old 03-07-2009, 01:27 PM   #2
Join Date: Dec 2008
Location: South Western Ontario
Posts: 955
Rewards Points: 500

Go here to read up on ventuilation. This is from close to home


Chemist1961 is offline   Reply With Quote

Thread Tools
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
How to increase water pressure? AllGoNoShow Plumbing 26 09-06-2012 07:22 PM
Soffit venting question dat5574 Roofing/Siding 2 03-03-2009 10:21 AM
Soffit venting vs. DCI Smart Vent JDPII Roofing/Siding 1 02-28-2009 08:42 PM
Blocked Attic Soffit Vents on North Side - How to Improve Venting Jes Roofing/Siding 5 05-06-2008 09:35 AM
How do I increase my pressure so I can bleed air? pmacedo Plumbing 18 12-17-2007 09:06 PM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1