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 03-07-2013, 01:46 PM   #1
Newbie
 
Join Date: Feb 2013
Posts: 10
Share |
Default

Condensation and frost in attic


I recently went into my attic to check out what I thought might have been a bird or rodent trapped in there. When I got up there, I saw something I have never seen before, but don't know if it is normal.

When I looked at what would be the underside of the roof, I saw a coating of frost and what looked like condensation that had melted and refroze in big drops. The insulation does not appear to be wet, but it's blown insulation, so I don't know if it was or not.

Only living in Minnesota for about 18 months, I am not sure what normal conditions in an attic should be during the winter, and we had a rather warm one last year, so I have nothing to compare this to. So my question is this: Is what I am seeing normal? The frost/condensation looks like the frost you get on grass when it is starting to turn cold, as I can still see the OSB that makes up the roof structure. I am surprised at the drop formations, which is my main concern. If this is not normal, what could be the cause, and is it something to worry about?

arisley28 is offline   Reply With Quote
Old 03-07-2013, 02:10 PM   #2
Roofmaster
 
Join Date: Oct 2012
Location: Maryland
Posts: 3,423
Default

Condensation and frost in attic


Yes it is definitely something to be concerned about. You are loosing heat into your attic, and your attic is not properly ventilated. What is the temperature and RH in your attic compared to the outdoor temperature and RH?

Where is your insulation, in the floor of the attic?

__________________
" A lot of men build things, and a lot of things fall down "

jagans is offline   Reply With Quote
Old 03-07-2013, 02:50 PM   #3
Newbie
 
Join Date: Feb 2013
Posts: 10
Default

Condensation and frost in attic


The temp when I checked was in the 20s. This was coming off a cold snap that didn't get above 0 for 48 hours and the temp had been in the single digits for at least a week, if not 10 days. Don't know the relative humidity, but it has to be relatively low.

I keep the internal temp at 68, and I control the humidity with a whole house humidifier. It has a label on it that states where to set the dial based on the outside temperature range. I had it set appropriately for each day.

The insulation in the attic is blown insulation that sits on the floor.
arisley28 is offline   Reply With Quote
Old 03-07-2013, 02:53 PM   #4
Member
 
Join Date: Dec 2011
Location: Michigan
Posts: 843
Default

Condensation and frost in attic


Warm air hitting cold air!
Hardway is offline   Reply With Quote
Old 03-07-2013, 05:17 PM   #5
Member
 
GBrackins's Avatar
 
Join Date: Apr 2012
Location: Fairhaven, Massachusetts
Posts: 2,800
Default

Condensation and frost in attic


do you have any exhaust fans in the bathrooms, or kitchen? do they vent to the exterior of the structure or directly into your attic?
__________________
Gary

"You get what you pay for, and sometimes free costs more!"
GBrackins is online now   Reply With Quote
Old 03-07-2013, 06:01 PM   #6
Member
 
Join Date: Nov 2011
Location: Hartfield VA
Posts: 25,595
Default

Condensation and frost in attic


http://www.energystar.gov/index.cfm?...sulation_table

Lack of insulation, attic needs to be air sealed, and not enough venting as already mentioned.
Plan and simple.

Do a search in the insulation area. It's been discussed hundreds of time here.
joecaption is online now   Reply With Quote
Old 03-08-2013, 07:49 PM   #7
Registered User
 
Join Date: Mar 2009
Posts: 9,968
Default

Condensation and frost in attic


http://www.buildingscience.com/docum...bout-diffusion

IMO, your attic MAY (hard to see from here) be properly vented but the attic is not air-sealed, nor the insulation enough; http://www.energysaversny.com/frost_-_moisture

http://www.google.com/url?sa=t&sourc..._Bfo_A&cad=rja

Zone 6,7, R-49 required; http://publicecodes.cyberregs.com/ic..._11_par002.htm

http://publicecodes.cyberregs.com/ic..._11_sec002.htm
How thick is the insulation, blown fiberglass?

Gary
__________________
If any ads are present in my answer above, I do not condone/support/use the product or services listed, they are there against my permission.
Gary in WA is offline   Reply With Quote
Old 03-12-2013, 09:51 AM   #8
Exterior Construction
 
Windows on Wash's Avatar
 
Join Date: Aug 2011
Location: VA, MD, DC
Posts: 5,544
Default

Condensation and frost in attic


Air Seal, insulate, and vent.

All as mentioned above.

Windows on Wash is offline   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
Moisture and Frost in the Attic Cenzo22 Roofing/Siding 10 12-03-2012 02:32 PM
Recently Topped Up Attic with Blown Insulation...Now I have Frost/Condensation earthad1 Building & Construction 81 02-18-2011 12:42 PM
Condensation In Attic george@DIY Roofing/Siding 3 02-03-2008 10:36 PM
attic condensation darren Roofing/Siding 11 01-24-2006 10:27 PM
Attic Condensation billinak HVAC 4 11-09-2005 06:18 PM




Top of Page | View New Posts

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