05-27-2009, 06:35 AM
9,196 posts, read
24,942,559 times
Reputation: 8585
Quote:
Originally Posted by
sacredgrooves
Closed, year around, end of discussion. Anyone saying otherwise (this is region specific not nationwide) is incorrect. The humidity in our area pulled in through the vents during the summer months wreaks HAVOC on the crawlspace environment.
You obviously know what you're talking about - but that's never stopped me from spouting off anyway.
I have a hard time believing that a crawl space is so air tight that closing the vents is going to have much of an impact on the basic humidity levels in the air under the house. How would unconditioned air under the house have a different (i.e., lower) humidity level than the air around the outside of house?
05-27-2009, 06:49 AM
Location: Raleigh, NC
12,475 posts, read
32,249,243 times
Reputation: 9450
From what my inspectors say...closing the vents, without any air flow, will cause moisture, allowing mold to grow.
05-27-2009, 07:01 AM
2,008 posts, read
3,584,994 times
Reputation: 1610
What about fan exhausting air out at a certain temp/humidity level?
Last edited by zinner; 05-27-2009 at 07:21 AM ..
05-27-2009, 06:10 PM
31,683 posts, read
41,045,989 times
Reputation: 14434
Quote:
Originally Posted by
sacredgrooves
Closed, year around, end of discussion. Anyone saying otherwise (this is region specific not nationwide) is incorrect. The humidity in our area pulled in through the vents during the summer months wreaks HAVOC on the crawlspace environment. You do not have to take my word on it, I only own a company that mitigates crawlspace issues, and inspected 7,000 of them with our home inspection biz.
Try
Advanced Energy and see what they have to say....they are actual house scientists with a fantastic study performed on this very subject in our region with 6 identical houses.
Close your vents, especially in the summer.
Great link and great information.
05-27-2009, 06:14 PM
31,683 posts, read
41,045,989 times
Reputation: 14434
I am new to crawl spaces etc and this is my second summer. I did a lot of reading and the link from Sacredgrooves is excellent. I know from my neighborhood that the houses are not on the same playing field for potential crawl space problems. At least from my understanding. Perhaps someone can share the different things that can contribute to crawlspace problems. Does the height of the crawl space impact? What about the slope away from the house? What about how well the ground perks around the house? What about the quality of the drainage system? What about shrubs blocking the crawl space? What about anything else you can think of?
05-27-2009, 06:25 PM
Location: At the NC-SC Border
8,159 posts, read
10,931,523 times
Reputation: 6647
I leave mine open year round unless we get bitter cold weather risking pipes freezing. If vents were better closed all the time, why bother installing them in the first place
05-27-2009, 06:31 PM
Location: Middle Creek Township
2,036 posts, read
4,397,317 times
Reputation: 532
Quote:
Originally Posted by
VickiR
If the vents were meant to be closed year round, why do we have them?
Quote:
Originally Posted by
Poggly Woggly
If vents were better closed all the time, why bother installing them in the first place
From what I read, it is old school to keep them open. It has been discovered recently that having them open actually causes more problems than it helps, but building codes have not caught up to the concept.
Quote:
Originally Posted by
VickiR
From what my inspectors say...closing the vents, without any air flow, will cause moisture, allowing mold to grow.
What I am hearing is that more airflow will pull more moisture out of the ground and into your house.
I AM SO CONFUSED!!!
05-27-2009, 07:15 PM
Location: Raleigh, NC
12,475 posts, read
32,249,243 times
Reputation: 9450
If you close the vents in the summer, the moisture and condensation from the ductwork will cause mildew, which leads to mold.
05-27-2009, 08:18 PM
31,683 posts, read
41,045,989 times
Reputation: 14434
Quote:
Originally Posted by
VickiR
If you close the vents in the summer, the moisture and condensation from the ductwork will cause mildew, which leads to mold.
Yes it seems you offer another variable. The concern not just about outside air but also the concern about moisture from your duct work. I have a fairly tall one and my insect guy checks for moisture when he sprays and so far bone dry.
05-27-2009, 08:22 PM
Location: North Raleigh
578 posts, read
3,081,729 times
Reputation: 276
The problem, as with all things, is there's too many "they" people with differing opinions. And with opinions that change over time. The classic being "Dont be butter, eat margarine! Oh crap, did we say eat margarine with all that transfat! Go eat some butter!"
Really, for every expert with one opinion you surely find another (or more) with the exact opposite.
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Alcohol use - People drinking some alcohol every month (%)
Alcohol use - People not drinking at all (%)
Alcohol use - Average days/month drinking alcohol
Alcohol use - Average drinks/week
Alcohol use - Average days/year people drink much
Audiometry - Average condition of hearing (%)
Audiometry - People that can hear a whisper from across a quiet room (%)
Audiometry - People that can hear normal voice from across a quiet room (%)
Audiometry - Ears ringing, roaring, buzzing (%)
Audiometry - Had a job exposure to loud noise (%)
Audiometry - Had off-work exposure to loud noise (%)
Blood Pressure & Cholesterol - Has high blood pressure (%)
Blood Pressure & Cholesterol - Checking blood pressure at home (%)
Blood Pressure & Cholesterol - Frequently checking blood cholesterol (%)
Blood Pressure & Cholesterol - Has high cholesterol level (%)
Consumer Behavior - Money monthly spent on food at supermarket/grocery store
Consumer Behavior - Money monthly spent on food at other stores
Consumer Behavior - Money monthly spent on eating out
Consumer Behavior - Money monthly spent on carryout/delivered foods
Consumer Behavior - Income spent on food at supermarket/grocery store (%)
Consumer Behavior - Income spent on food at other stores (%)
Consumer Behavior - Income spent on eating out (%)
Consumer Behavior - Income spent on carryout/delivered foods (%)
Current Health Status - General health condition (%)
Current Health Status - Blood donors (%)
Current Health Status - Has blood ever tested for HIV virus (%)
Current Health Status - Left-handed people (%)
Dermatology - People using sunscreen (%)
Diabetes - Diabetics (%)
Diabetes - Had a blood test for high blood sugar (%)
Diabetes - People taking insulin (%)
Diet Behavior & Nutrition - Diet health (%)
Diet Behavior & Nutrition - Milk product consumption (# of products/month)
Diet Behavior & Nutrition - Meals not home prepared (#/week)
Diet Behavior & Nutrition - Meals from fast food or pizza place (#/week)
Diet Behavior & Nutrition - Ready-to-eat foods (#/month)
Diet Behavior & Nutrition - Frozen meals/pizza (#/month)
Drug Use - People that ever used marijuana or hashish (%)
Drug Use - Ever used hard drugs (%)
Drug Use - Ever used any form of cocaine (%)
Drug Use - Ever used heroin (%)
Drug Use - Ever used methamphetamine (%)
Health Insurance - People covered by health insurance (%)
Kidney Conditions-Urology - Avg. # of times urinating at night
Medical Conditions - People with asthma (%)
Medical Conditions - People with anemia (%)
Medical Conditions - People with psoriasis (%)
Medical Conditions - People with overweight (%)
Medical Conditions - Elderly people having difficulties in thinking or remembering (%)
Medical Conditions - People who ever received blood transfusion (%)
Medical Conditions - People having trouble seeing even with glass/contacts (%)
Medical Conditions - People with arthritis (%)
Medical Conditions - People with gout (%)
Medical Conditions - People with congestive heart failure (%)
Medical Conditions - People with coronary heart disease (%)
Medical Conditions - People with angina pectoris (%)
Medical Conditions - People who ever had heart attack (%)
Medical Conditions - People who ever had stroke (%)
Medical Conditions - People with emphysema (%)
Medical Conditions - People with thyroid problem (%)
Medical Conditions - People with chronic bronchitis (%)
Medical Conditions - People with any liver condition (%)
Medical Conditions - People who ever had cancer or malignancy (%)
Mental Health - People who have little interest in doing things (%)
Mental Health - People feeling down, depressed, or hopeless (%)
Mental Health - People who have trouble sleeping or sleeping too much (%)
Mental Health - People feeling tired or having little energy (%)
Mental Health - People with poor appetite or overeating (%)
Mental Health - People feeling bad about themself (%)
Mental Health - People who have trouble concentrating on things (%)
Mental Health - People moving or speaking slowly or too fast (%)
Mental Health - People having thoughts they would be better off dead (%)
Oral Health - Average years since last visit a dentist
Oral Health - People embarrassed because of mouth (%)
Oral Health - People with gum disease (%)
Oral Health - General health of teeth and gums (%)
Oral Health - Average days a week using dental floss/device
Oral Health - Average days a week using mouthwash for dental problem
Oral Health - Average number of teeth
Pesticide Use - Households using pesticides to control insects (%)
Pesticide Use - Households using pesticides to kill weeds (%)
Physical Activity - People doing vigorous-intensity work activities (%)
Physical Activity - People doing moderate-intensity work activities (%)
Physical Activity - People walking or bicycling (%)
Physical Activity - People doing vigorous-intensity recreational activities (%)
Physical Activity - People doing moderate-intensity recreational activities (%)
Physical Activity - Average hours a day doing sedentary activities
Physical Activity - Average hours a day watching TV or videos
Physical Activity - Average hours a day using computer
Physical Functioning - People having limitations keeping them from working (%)
Physical Functioning - People limited in amount of work they can do (%)
Physical Functioning - People that need special equipment to walk (%)
Physical Functioning - People experiencing confusion/memory problems (%)
Physical Functioning - People requiring special healthcare equipment (%)
Prescription Medications - Average number of prescription medicines taking
Preventive Aspirin Use - Adults 40+ taking low-dose aspirin (%)
Reproductive Health - Vaginal deliveries (%)
Reproductive Health - Cesarean deliveries (%)
Reproductive Health - Deliveries resulted in a live birth (%)
Reproductive Health - Pregnancies resulted in a delivery (%)
Reproductive Health - Women breastfeeding newborns (%)
Reproductive Health - Women that had a hysterectomy (%)
Reproductive Health - Women that had both ovaries removed (%)
Reproductive Health - Women that have ever taken birth control pills (%)
Reproductive Health - Women taking birth control pills (%)
Reproductive Health - Women that have ever used Depo-Provera or injectables (%)
Reproductive Health - Women that have ever used female hormones (%)
Sexual Behavior - People 18+ that ever had sex (vaginal, anal, or oral) (%)
Sexual Behavior - Males 18+ that ever had vaginal sex with a woman (%)
Sexual Behavior - Males 18+ that ever performed oral sex on a woman (%)
Sexual Behavior - Males 18+ that ever had anal sex with a woman (%)
Sexual Behavior - Males 18+ that ever had any sex with a man (%)
Sexual Behavior - Females 18+ that ever had vaginal sex with a man (%)
Sexual Behavior - Females 18+ that ever performed oral sex on a man (%)
Sexual Behavior - Females 18+ that ever had anal sex with a man (%)
Sexual Behavior - Females 18+ that ever had any kind of sex with a woman (%)
Sexual Behavior - Average age people first had sex
Sexual Behavior - Average number of female sex partners in lifetime (males 18+)
Sexual Behavior - Average number of female vaginal sex partners in lifetime (males 18+)
Sexual Behavior - Average age people first performed oral sex on a woman (18+)
Sexual Behavior - Average number of woman performed oral sex on in lifetime (18+)
Sexual Behavior - Average number of male sex partners in lifetime (males 18+)
Sexual Behavior - Average number of male anal sex partners in lifetime (males 18+)
Sexual Behavior - Average age people first performed oral sex on a man (18+)
Sexual Behavior - Average number of male oral sex partners in lifetime (18+)
Sexual Behavior - People using protection when performing oral sex (%)
Sexual Behavior - Average number of times people have vaginal or anal sex a year
Sexual Behavior - People having sex without condom (%)
Sexual Behavior - Average number of male sex partners in lifetime (females 18+)
Sexual Behavior - Average number of male vaginal sex partners in lifetime (females 18+)
Sexual Behavior - Average number of female sex partners in lifetime (females 18+)
Sexual Behavior - Circumcised males 18+ (%)
Sleep Disorders - Average hours sleeping at night
Sleep Disorders - People that has trouble sleeping (%)
Smoking-Cigarette Use - People smoking cigarettes (%)
Taste & Smell - People 40+ having problems with smell (%)
Taste & Smell - People 40+ having problems with taste (%)
Taste & Smell - People 40+ that ever had wisdom teeth removed (%)
Taste & Smell - People 40+ that ever had tonsils teeth removed (%)
Taste & Smell - People 40+ that ever had a loss of consciousness because of a head injury (%)
Taste & Smell - People 40+ that ever had a broken nose or other serious injury to face or skull (%)
Taste & Smell - People 40+ that ever had two or more sinus infections (%)
Weight - Average height (inches)
Weight - Average weight (pounds)
Weight - Average BMI
Weight - People that are obese (%)
Weight - People that ever were obese (%)
Weight - People trying to lose weight (%)
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I have a hard time believing that a crawl space is so air tight that closing the vents is going to have much of an impact on the basic humidity levels in the air under the house. How would unconditioned air under the house have a different (i.e., lower) humidity level than the air around the outside of house?
