Reuben's Home Inspection Blog

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Why Is There Frost In My Attic?

Frost in atticAt the last four home inspections that I've done, every home had frost problems in the attic. Have you checked for frost in your attic yet this year?  If you live in Minnesota or a similarly cool climate, now is a good time to check your attic for frost.  

Temperatures in Minnesota have been in the teens lately, which is plenty cool enough for frost to develop in attics.  Once we get a week of sub-zero temperatures, frost will really start to accumulate in attics.  The colder it is outside, the more frost will accumulate in an attic.   If you already have frost in your attic, I can assure you that it's only going to get worse - winter is still two weeks away.  

Please excuse me while I digress for a moment.  Who the heck decides when the seasons change?  Yes, I know what the winter solstice is, but what a silly indicator of winter.  Winter in Minnesota should officially start on December 1st or after the first snow fall, whichever comes first.  Half the leaves were still on the tree in my back yard when we got our first snow this year, which happened on November 13th.   That wasn't a light dusting either.  When the ground gets covered with snow, fall is over in my book, no matter what the calendar says.

Frost doesn't do much damage to roofs while it remains frost, but when it melts, it makes a big mess. When the frost melts, there is often enough water to saturate the insulation in the attic and leave stains all over the ceilings.   This is the short-term problem with frost in attics.  The long term problem is that this continual saturation of the roof decking can cause the plywood on the roof decking to delaminate; when this happens, it loses a lot of it's strength and nails are much more prone to pulling out.  The fix for delaminated roof decking is to replace it.

The photos below all show roofs with delaminated plywood; this is caused by frost in the attic.  The last picture is especially nasty.  Click on any of the photos for a larger version.

Delaminated Plywood

Delaminated Plywood 2

Delaminated Plywood 3 

The way to prevent frost from accumulating in an attic is to prevent warm, moisture-laden air from getting there in the first place.  There are two basics ways of doing this.

Seal attic bypasses  

Attic bypasses are passageways for warm air to leak in to the attic.  A few common places to find these gaps are around furnace vents, plumbing vents, electrical boxes, and electrical wires coming in to the attic.  Any bath fans, kitchen fans, or dryers venting in to the attic space will absolutely wreak havoc.  Even small gaps in any of these vents can bring a lot of moisture in to the attic.  For more tips on locating attic air leaks and sealing them, download this handout.

Lower the humidity in your home

 I find frost problems in almost every single attic where someone uses a whole house humidifier.  That's why I don't like whole house humidifiers.  It's nearly impossible to seal every little bypass to an attic, but when interior humidity levels are kept fairly low, sealing most attic bypasses is good enough.  Here are a few ways to lower humidity levels in your home:

  • Turn off your whole house humidifier (duh)
  • If you have one, use your kitchen exhaust fan when you're cooking.  Gas ovens add a considerable amount of moisture to the air.
  • If you have a crawl space, make sure that a proper vapor barrier is installed on the crawl space floor.
  • Turn on your bathroom exhaust fan during showers and leave them on for a half hour after every shower.  If you don't have a bathroom exhaust fan, get one.  While the building code allows an openable window as a substitute for a fan, I don't ;-)
  • Install an HRV or a continuous exhaust fan.  Either one of these will dramatically lower humidity levels in a home.

Will adding more ventilation to an attic prevent frost?  No, this won't do squat.  I've been in tons of attics that were completely covered in frost, yet had fantastic ventilation.  To fix the frost in your freezing attic, focus on forbidding the moisture from getting there in the first place.

 

 

Reuben Saltzman, Structure Tech Home Inspections

        

Comment balloon 62 commentsReuben Saltzman • December 07 2010 06:01AM

Comments

I don't know about frost in the attic but when I read you already had snow that was enough.  While I like to visit up north it's cold enough where I live. 

Posted by James Dray, Exceptional Agents, Outstanding Results (Fathom Realty AR LLC) almost 8 years ago

Hi James, according to the weather channel, it's 26 degrees where you live right now.  That really is cold - I don't blame you. 

Posted by Reuben Saltzman, Delivering the Unbiased Truth. (Structure Tech Home Inspections) almost 8 years ago

Reuben, good info.  I'd never even thought about frost in the attic.  What humidity level is considered low humidity?

Posted by Chanda Barrick, in referral (Keller Williams Indy Metro Northeast) almost 8 years ago

Heat seeks cold.  When heat and cold meet, condensation results.

Minimize the heat as much as possible and the condensation follows.

Or something like that...

Posted by Jay Markanich, Home Inspector - servicing all Northern Virginia (Jay Markanich Real Estate Inspections, LLC) almost 8 years ago

Hi Reuben - Great post. I'm ging to check my attic today!

Posted by Judy Klem, Home Staging, Senior Move Management, Fairfield/New Haven counties (Transition Stage LLC) almost 8 years ago

Reuben, A couple of things;

  1. Warning, science content. The winter solstice is an astrological event. It is when the sun reaches the furthers point in the southern hemisphere, giving the northern hemisphere our shortest day. It really has nothing to do with when winter begins. It just makes marking the seasonal changes on a calender easier.
  2. I do see this happening here in CT, as I wrote yesterday, but not as frequently. I'm certain what you say applies in MN, but not necessarily every where. You are in a VERY cold climate while I am in a cold climate. That makes a difference.
  3. Over humidification and or poor ventilation here is almost always the culprit to frost or condensation in attics. I'm quite certain that by passes do contribute, but not as much as I would assume in your climate.
Posted by James Quarello, Connecticut Home Inspector (JRV Home Inspection Services, LLC) almost 8 years ago

Reuben, it would be interesting to know what the actual humidity levels are in the homes that have a lot of frost in the attic.  Lowering humidity is essential as well as bypasses---along with great vapor retarders.

Posted by Charles Buell, Seattle Home Inspector (Charles Buell Inspections Inc.) almost 8 years ago

Chanda - I wish there was a number I could give you that would indicate low humidity, but it's really different for every house.  As a general rule, if you have condensation on your windows, your humidity level is too high.  Of course, this assumes you're not using single-pane windows.

Jay - pretty close.

Judy - let me know what you find.

James - yeah, I know what the winter solstice is, but again, I go bonkers when people announce two weeks from today that it's officially the 'first day of winter'.  

I'm guessing frost doesn't stick around in CT nearly as much as it does here.

Also, I think bypasses may have more effect on condensation that you think.  How else would the moisture be getting in to the attic?  

Posted by Reuben Saltzman, Delivering the Unbiased Truth. (Structure Tech Home Inspections) almost 8 years ago

Good info.  This does not happen too much out her in Portland Oregon, but it can drop below freezing at night so it has potential to happen

Posted by doug diller (Goal Line Inspections) almost 8 years ago

Great tips to keep your home in top shape ans save the energy that moisture can zap

Posted by William Feela, Realtor, Whispering Pines Realty 651-674-5999 No. (WHISPERING PINES REALTY) almost 8 years ago

Charles - I already know what the humidity levels are: too high :).  

But seriously, what I'm really curious about is whether proper ventilation will actually increase frost in attics.  At one of today's inspections on an old house with a bathroom exhaust fan blowing in to the attic, there was NO frost in the attic.  This house had very poor ventilation in the attic.  My suspicion is that there was so little ventilation and so much heat loss that the roof boards were just too warm to allow condensation.

Doug - I'm guessing you'll find very little of it.

William - good point; saturated insulation is almost worthless.

Posted by Reuben Saltzman, Delivering the Unbiased Truth. (Structure Tech Home Inspections) almost 8 years ago

Great post, Reuben, and great pictures of the delam. I guess it won't be too long and it will be ice dam season.

Posted by Jason Channell, The House Sleuth (Diadem Property Inspections - Serving Southeast Michigan) almost 8 years ago

Yeah, I'd already ice dam season here in Minnesota.  I've seen plenty of nasty ice dams already this year.  I can't remember it ever happening this early in the season though.

Posted by Reuben Saltzman, Delivering the Unbiased Truth. (Structure Tech Home Inspections) almost 8 years ago

Reuben, Sorry I guess I missed your humor. It also drives me crazy how on that day winter or what ever season suddenly begins.

I would have to say without exception when I find a severe case of attic condensation it's from humidifiers. I'm not denying that bypasses play a role, they surely do. As does the crappy fiberglass insulation and the vapor retarders (they do not completely block vapor) or lack of.  The ventilation is important as well as it removes the moisture laden air.

The climate here is not nearly as cold which does have an effect on condensation in attics. There is no one right answer to this phenomenon.

Posted by James Quarello, Connecticut Home Inspector (JRV Home Inspection Services, LLC) almost 8 years ago

Reuben, it would be highly unlikely---especially in your area---that "adequate" ventilation would be the cause of a problem---your dry winter air would easily pick up any moisture as it was warmed up in the attic and then carried out of the attic

Posted by Charles Buell, Seattle Home Inspector (Charles Buell Inspections Inc.) almost 8 years ago

Yikes, that first photo is pretty scary Reuben. May need to check the 'ole attic, since temperatures are getting colder and colder here in Arlington.

Posted by Aaron Seekford, Ranked Top 1% Nationwide 703-836-6116 (Arlington Realty, Inc.) almost 8 years ago

Great information.  We do have a humidifier attached to our furnace but keep it just high enough so that there is not static electricity in our home.  We do not have a condensation or frost problem.  Yes, I have been in the attic to check. It is frustrating when it happens because it does wreak havoc with the ceiling finish.

Posted by Mike McCann - Nebraska Farm Land Broker, Farm Land For Sale 308-627-3700 or 800-241-3940 (Mike McCann - Broker, Farmland Broker-Auctioneer Serving Rural Nebraska) almost 8 years ago

Yikes, that doesn't look good at all.  Maybe I should peek up in my attic today.

Posted by Justin Dibbs, REALTOR® - Ashburn Virginia Homes for Sale (Pearson Smith Realty) almost 8 years ago

I don't see this here in AZ. However, it helps me understand my clients better because I handle a lot of retirement age folks from up north. Thank you for helping me get better at my job.

Posted by Jessica Leimback, Broker,SFR,CNE,CSSPE (Agave Homes & Investments) almost 8 years ago

I didn't know this was possible!  We don't usually get that cold here in the Willamette Valley of Oregon, but we are plenty damp!

Posted by Catherine Ulrey, Equestrian and Acreage Property Specialist (Keller Williams Capital City) almost 8 years ago

I knew there was a reason I live at 1000 feet above sea level and put up with a couple months of 110+ degree weather.  Some of the high school kids are still wearing shorts to school.

Posted by Loren Green, Phoenix Home Inspector & Designer (Greens Home Design L.L.C.) almost 8 years ago

James - no prob, half the time it's me not getting someone else's joke.

Charles - I agree, I definitely wouldn't say adequate ventilation would cause this problem, but I am curious if lack of proper ventilation would be enough to prevent or at least reduce this problem.  Once the moisture turns to frost, no amount of ventilation will make that frost go away.  The frost is going to remain frost until it melts and evaporates, and that can't possibly happen until it gets warmed up.  I might have to construct a few test houses this winter to test out this idea.

Aaron - and that was a pretty mild coating of frost.  I'll have some jaw-dropping photos to share in about a month, I'm sure.

Mike - I'm glad you're keeping your humidity levels in check.  I have to assume that frost in attics isn't nearly as much of a problem in Nebraska.

Justin - If you have frost, be sure to come back and post a photo.

Posted by Reuben Saltzman, Delivering the Unbiased Truth. (Structure Tech Home Inspections) almost 8 years ago

Jessica - no, I suppose you'll never see anything like this down in AZ.  You have to worry about things like termites instead.

Catherine - you probably need to look out for moisture in your attic; James Quarello recently posted on that topic.  You can read his post here http://activerain.com/blogsview/2005009/and-the-rains-came

Loren - believe it or not, we have a few people in shorts around here too.  I call them crazy.

Posted by Reuben Saltzman, Delivering the Unbiased Truth. (Structure Tech Home Inspections) almost 8 years ago

Thanks for the post Reuben. I was actually up in my attic and there is some frost. I think its a ventilation issue. Had the roof done 4 yrs ago and think they didnt put enough vents in.

Posted by David Archibald (RE/MAX Aboutowne Realty Corp) almost 8 years ago

Reuben,

That was a really interesting post especially since I am in Texas. Luckily thats one problem we don't have much of. Now if you want to talk about shifting soils...

-Brent

'

Posted by Brent & Deb Wells, Prosper TX (LivingWell Properties) almost 8 years ago

David - If you end up having more vents installed, please let me know if it makes any difference.

Brent - I've heard you guys have some nasty foundation problems down there in Texas.

Posted by Reuben Saltzman, Delivering the Unbiased Truth. (Structure Tech Home Inspections) almost 8 years ago

Reuben, for sure if you have it forming in an attic it is too late---there is a problem.  However. ice (frost, snow etc) does evaporate without going to liquid first.  Ever notice how ice cubes will get smaller if left forever in an ice cube tray?  Incidental moisture that escapes and condenses in the attic (leaving the hatch open for a few hours) and then freezes will disappear on its own---if it isn't continually being added to.

Posted by Charles Buell, Seattle Home Inspector (Charles Buell Inspections Inc.) almost 8 years ago

Charles - good point.  By the way, I usually blame my wife for making ice cubes too small when I find those little nuggets in the freezer ;)

Posted by Reuben Saltzman, Delivering the Unbiased Truth. (Structure Tech Home Inspections) almost 8 years ago

The frost problem must react different in different weather areas.  We have found that to vent the roof area between prevents moisture build-up and therefore reduces any frost build-up.  The home owners that cover their attic vents always have a high moisture problem. 

Posted by Don Eichler almost 8 years ago

Thanks for the information today. I always enjoy your posts and look forward to the tips/

I've bookmarked this for future reference.

Happy Holidays!

 

Patricia/Seacoast NH & ME

Posted by Patricia Aulson, Realtor - Portsmouth NH Homes-Hampton NH Homes (BERKSHIRE HATHAWAY HOME SERVICES Verani Realty NH Real Estate ) almost 8 years ago

Hi Reuben

Nice timely post for this time of year.

Take a star on me.

Posted by Bob Elliott, Chicago Property Inspection (Elliott Home Inspection) almost 8 years ago

Don- covering the attic vents is bad news, there's no question about that.

Patricia - thanks, and happy holidays to you.

Bob - much appreciated, thanks!

Posted by Reuben Saltzman, Delivering the Unbiased Truth. (Structure Tech Home Inspections) almost 8 years ago

Great information. Thanks for the post!

Posted by Dustin McClure (Mossy Oak Properties Outdoor Realty) almost 8 years ago

Hi Rueben -- Sounds like excellent advice.  The health experts say you should have your humidity levels around 35-45% in the winter, depending on the actual temperature to prevent more colds, infections, etc.  I guess you just can't win either way.

Posted by Chris Olsen, Broker Owner Cleveland Ohio Real Estate (Olsen Ziegler Realty) almost 8 years ago

I have to find the happy medium between enough humidity to keep the wood floors from separating and so much humidity that the attic develops frost.  Fortunately it is still plenty warm here (and with no snow!)

Posted by Mike Weber, 40+ years in Northern Colorado (Keller Williams Realty Northern Colorado) almost 8 years ago

Thanks for the education. I never lived in a place that was cold enough to get frost in the attic. Thanks to you and your blog I know enough to understand the problem if it ever comes up in a conversation with a snow-bird.

Posted by George Bennett, Inactive Principal Broker, GRI (Inactive) almost 8 years ago

Now if that isn't a great reason not to live in Minnesota then I've never heard one! Kidding, of course! I've never ever heard of frost in an attic before!

Posted by Cynthia Larsen, Independent Broker Serving Sonoma County, CA (Safe Haven Realty) almost 8 years ago

I agree - winter started here in North Idaho quite a while ago! Today it's raining on about 2 or 3 feet of snow - what a sloppy mess!

Those are great tips about keeping frost out of the attic - I think far too many people think it's OK to vent their fans into the attic space - just like they think it's OK to vent the dryer under the house.

Posted by Marte Cliff, your real estate writer (Marte Cliff Copywriting) almost 8 years ago

Rueben, I agree with the whole winter thing.  I always tell my kids there are two ways to measure seasons:  astronomically and meteorlogically.  I prefer the meteoroligical (i.e. temperature!), but the astronomical provides a standard point of reference so we don't end up having to adjust our calendars.  I think there was a time when the calendar was so far off that it was snowing in July, and then they went to astronomical measurements.  (That last one was from what I remember my astronomy teacher in college saying, so maybe I didn't understand him correctly, but it sure sounds dramatic).

I went to college in Ashland, WI.  It was pretty similar (if not a little colder) than where you are, and I had a friend in Bemidji where it's REALLY cold.  I miss those places!

Posted by Jeremy Wrenn, President, Wrenn Home Improvements (Wrenn Home Improvements) almost 8 years ago

Great post.  If you're looking at your attic in this weather, you've got problems.  OR, notice that it's raining on your while your getting the Christmas stuff down.

Posted by Lyn Sims, Schaumburg IL Real Estate (RE/MAX Suburban) almost 8 years ago

I like the Winters but the brutal cold gets tiresome after a while.

Posted by Dennis & Terri Neal, Your Home Sold in 45 Days or We Se (RE/MAX, Big Bear) almost 8 years ago

Thank God I live where today we are down into the icey 40's.  Of course we have to watch the earth quake bracing.

Posted by Gene Riemenschneider, Turning Houses into Homes (Home Point Real Estate) almost 8 years ago

Reuben, thanks for the info on frost in the attic.  My brother lived in St. Paul for about 3 years with his family.  He could not take the cold...so they moved back to Texas.  I guess it's all what you're used to. :)

Posted by Sonja Patterson, Texas Monthly 5-Star Realtor Recipient for the Hou (Keller Williams - BV) almost 8 years ago

Thanks Dustin.

Chris - I'm sure the more humidity in your home, the healthier you'll be and the less healthy your house will be.  

Mike - I heard somewhere that Mariah Carey uses dozens of humidifiers and had a waterproof steam room built for her bedroom.

George - I bet you'll sound like an old pro.  You'll be able to wax on the negative impacts of attic bypasses!

Cynthia - you say you're kidding, but heck, I agree with you.

Marte - rain on top of snow?  Yuck, what a mess.  That's only supposed to happen in the spring.

Jeremy - I don't know about Ashland, but Bemidji... yeah, that's damn cold.  Even for me.

Lyn - the most frequent comment I hear from homeowners about their attic is "I've never been up there!"

Dennis & Terri - oh man, you're not kidding.  It really doesn't take a long time for the brutal cold to get old.

Gene - I don't think there is such a thing as "Icey 40's" (ha ha)

Sonja - I can't say I blame your brother.  After living here long enough, I've come to realize that Minnesotans actually enjoy complaining about the weather.  

 

Posted by Reuben Saltzman, Delivering the Unbiased Truth. (Structure Tech Home Inspections) almost 8 years ago

Excellent post!  I've lived my entire life (almost) in chilly areas, and the past 11 years at 4200 feet elevation... therefore quite cold as early as September.  We bring in our tomatoes that month, and this year we had the better part of 2' of snow by Thanksgiving.  Back to the subject... I've never heard of frosty attics!  I will have to check with local inspectors to see what they have to say about it.

Thanks so much!

Victoria

Posted by Victoria CB Trees, Principal Broker (Crater Lake Realty, Inc.) almost 8 years ago

Hi Reuben:  Frost in the attaic is not something we ever have to worry about in Woodland Hills, California.  Your information is very useful for home preservation in many parts of the country.  Wishing you much success in 2011.  All your referals for southern California buyers and sellers are much appreciated.

 

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Bandele Oguntomilade
Bogun Realty and Luxury Homes
Phone: 818-825-6996
www.BogunRealtyAndLuxuryHomes.com

Posted by Bandele Oguntomilade, Your Woodland Hills Real Estate Agent 818-825-6996 (Bogun Realty and Luxury Homes) almost 8 years ago

Reuben,

My 110 years old Victorian house still leaks air in a thousand different places. Almost impossible to seal these guys entirely. Strangely enough in many cases this is why there are still around. They dry out fairly rapidly from internal or external sources of moisture due to the air movement.

For the many more modern home than mine, great information.

I have heard that the idea humidity level in a home are between 25 and 45%. Lower than 25% tends to be uncomfortable for us while higher than 45% can encourage mold growth. I would guess that the closer to 25% we can get the better for mold and other humidity related problems..

Posted by Marshall Brown, BSEE, CHI (Mid America Inspection Services, LLC) almost 8 years ago

Haha!  I thought only Buffalonians were crazy enough to wear shorts when it's snowing!  Yet another reason why I don't like whole-house humidifiers; reason #1 is the common problem of them leaking on, and therefore rusting heat exchangers.

Posted by Julie Babcock -Nook & Cranny Home Inspections (Nook & Cranny Home Inspections Tonawanda, NY) almost 8 years ago

Victoria - let me now what your local inspectors say.

Bandele - you're lucky you don't have to worry about this kind of thing.  BTW, that's one heck of a signature.

Marshall - those old houses perform very well when they get wet; they just cost a ton of money to heat.  How's your heating bill?  People say it's not 'green' to have a house that leaks that much air, but you could always tell 'em it's not 'green' to have houses rot and have to re-build them.

Julie - no, Buffanonians don't have the market cornered on 'crazy'!  I agree, humidifiers either leak or are going to leak.

Posted by Reuben Saltzman, Delivering the Unbiased Truth. (Structure Tech Home Inspections) almost 8 years ago

Reuben, it is way to cold where you live.  Burrrrrrr!   I know we have a lot of problems here in California but I am sooo glad it is not as cold.  Our skin here is way tooo thin.  Great post.

Posted by DeeDee Riley, Realtor - El Dorado Hills & the Surrounding Areas (Lyon Real Estate - El Dorado Hills CA) almost 8 years ago

What a fantastic article.  I had not thought about how this occurs.  I have just been reading about insufficient insulation in the attic, whic is of course another story.  I will book mark this and share later.  Than you Reuben. Margaret C.

Posted by Margaret C. Taylor, St Marys/Calvert/Charles MD Real Estate Agent (Century 21 New Millennium MD) almost 8 years ago

DeeDee - Don't get me started on the weather.  It's currently -0 degrees outside with a wind chill of -22, and we just got 17 inches of snow yesterday.  I was supposed to be going to the Vikings vs. Giants game today, but they actually cancelled it because of the weather.  At least we have something to talk about...

Margaret - thanks.  After getting 17 inches of snow last night, I started thinking about why I'm so insistent that ventilation won't do anything to alleviate frost in attics.  I base my stance on experience; I've seen zero correlation between frost problems and good / bad ventilation in attics, but I really haven't taken snow into account.  When roof vents are covered with a foot of snow, they might as well not exist.

Posted by Reuben Saltzman, Delivering the Unbiased Truth. (Structure Tech Home Inspections) almost 8 years ago

Nice post Reuben.

Posted by Doug Laurent, Mpls. & Extended Metro Area (Homefax Inspections, LLC) almost 8 years ago

Lots of interesting responses. It has been my experience along with formal training that indeed poor ventilation and improper underlayment are the main causes for frost in an attic. Many seem to think it is normal to have frost in the attic during the winter, however it really isn't and if there is frost in the attic, somethings not quite right. I live in Indiana and today is -5, no frost in my attic.

Just sayin.

Posted by MC2 Home Inspections (MC2 Home Inspections LLC) almost 8 years ago

This is a good explanation. Moist air is never a good idea in any attic.

Posted by Wayne B. Pruner, Tigard Oregon Homes for Sale, Realtor, GRI (Oregon First) almost 8 years ago

Doug - thanks.  I don't think we've met; I'm sure we'll chat later.

MC2 - I've had the same formal training that says poor ventilation is the main cause for frost in an attic, but I pay close attention to this stuff at every inspection.  Despite what the textbooks say, I've found zero correlation between ventilation and frost.  It's all about attic air leakage.  It sounds like your attic must be sealed up tight.

Tigard - agreed.  

Posted by Reuben Saltzman, Delivering the Unbiased Truth. (Structure Tech Home Inspections) almost 8 years ago

Inspected a house yesterday with a brand new roof. There are three bathroom vents that vent directly into the attic! The seller tried to convince me that his roofer vented all the bathroom vents through the roof! I love my camera at times like these!

Posted by Hank Richter (HomePro Inspections of RI) almost 8 years ago

Hank - how can anyone argue about that?  "Your roofer put them through the roof?  Show me."

Posted by Reuben Saltzman, Delivering the Unbiased Truth. (Structure Tech Home Inspections) almost 8 years ago

Make sure bath and kitchen exhaust fans discharge to the exterior instead of into the attic so you don't add moisture to the attic from those locations.

Posted by Bruce Breedlove (Avalon Inspection Services) almost 8 years ago

Bruce - those are a couple of the largest bypasses I can think of.

Posted by Reuben Saltzman, Delivering the Unbiased Truth. (Structure Tech Home Inspections) almost 8 years ago

Great tips Reuben!  I think a lot of people fail to turn on the exhaust fans during and after showers.

Posted by Patricia Beck, Colorado Springs Realty (RE/MAX Properties, Inc., GRI, CDPE) over 7 years ago

High moisture in the home and attic could also lead to mold, which I find alot in attics with poor ventilation.

Posted by Jim Watzlawick, Watz Home Inspections (Watz Home Inspections) over 7 years ago

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