Many homeowners searching the internet for crawlspace repair information end up in home repair forums. While there is some good information out there, there are many examples of bad and outdated advice related to repairing crawlspaces. I have witnessed firsthand the results of unprofessional crawlspace repair and would like to set the record straight on what I consider to be the worst 5 crawlspace repairs I've seen.
1. Adding more foundation vents to the crawlspace - Old buiding codes and bad advice have resulted in homeowners adding more vents to their crawlspace in order to dry the high moisture content in their crawlspaces. The thinking behind ventilation was that air circulation would force the moisture in the crawl space air to end up outside. Through testing, it has been proven that warm, humid outdoor air brought into the crawl space through foundation vents in the summer can lead to increased moisture levels in the crawlspace. Also, the air movement in a home does not move side to side through the vents, but instead upwards (Stack Effect). This Stack Effect draws air inward from every crawl space vent and up into the living space of the home. A properly encapsulated crawlspace is the only solution to reduce high moisture levels in a crawlspace.
2. Spray Foam a wet or damp crawlspace foundation wall - In a dry below-grade crawlspace this method is the most energy efficient. The problem is that in most below-grade crawlspaces, the foundation or ground floor of the crawlspace are NOT dry. In fact, a majority of the crawlspaces I run across with spray foam have some form of dry rot in the structural components because the foam has trapped the moisture in the wood. It is not uncommon to see the spray foam become separated from the wall from the moisture intrusion. Unless the crawlspace has external footing drains, a foundation waterproofing membrane, a foundation sealant, positive grade, and downspout extensions, I cannot ever recommend this method of insulation.
3. Staple a vapor barrier to the floor joists - I have not seen a single crawlspace repair mistake more responsible for wood rot and mold than when plastic is attached to the floor joist system. The thinking behind this is to stop moisture intrusion of the crawlspace air from entering the wood components. There are many problems with this; but the most important to know is that most crawlspaces are vented and the cooler surfaces such as duct work, pipes, and the floor will condensate in the summer. The plastic will trap the condensation up against the floor structure causing mold and wood rot to occur.
4. Insulating a damp crawlspace with fiberglass insulation - This is another example of outdated advice resulting in mold growth. Paper faced insulation is "mold candy". Please read Do not insulate your floors with fiberglass insulation for the complete scoop.
5. Improper drainage system installations - Many crawlspaces have water standing on the ground floor after heavy rains. There are many reasons why water enters, and several solutions to prevent or remove the standing water. The worst solution is to ignore this recurring problem, or repair the problem with a stand alone pit and pump (especially a pump in a five gallon bucket). A sump pump alone cannot pump all the water that pools around the perimeter or in the middle of the crawlspace. A perimeter drain is necessary to intercept the water and facilitate it to the pump.
6. Venting the Dryer into the Crawlspace - this is only considered a repair mistake because homeowners quit trying to replace the dryer duct in the crawlspace after it breaks or clogs. This will pump gallons of water into the crawlspace air causing it to move upward into the wood components because warm air rises.
7. Insulating Heat Ducts in a Crawlspace with Fiberglass - Ducts in a vented crawlspace will condensate and the fiberglass will soak up all of this excess water causing mold to grow around the duct in the fiberglass.
Additional Problems:
Improper Gutter and Downspout Maintenance - Gutters are designed to take roof water away from your home and foundation. Allowing clogged gutters to over pour water will result in more water entering the crawlspace. The biggest mistake of all is allowing the downspouts to drain the water right up against the foundation. The downspouts should be extended at least 10' to 15' away from the home to prevent roof water from entering the crawlspace.
Larry Ralph Jr.
Comment
Comment by Bob Daley on January 25, 2013 at 9:56am Ugh! I read #2 and shuddered--spray foam is great but it should NEVER be used on a damp surface! What a nightmare.
LOL. My aunt and uncle have four 50 gallon electric water heater in their summer home, with a recirc, that runs 24/7/365. I suspect the same goes for the electric floors in the 5 bathrooms.
Tom,
I've been down the path of investing time and energy to save other people money they don't care about saving, its not fruitful or rewarding. Again, "chasing savings here represents negative return on time invested for them" and therefore, for you. I believe the meat of the energy saving market is people with incomes under $150k, for these people the savings matters more than the time it costs to achieve it.
Sell them a Navien or leave the heater's alone, adjusting settings only opens the door to complaints.
Comment by Tom Delconte on April 12, 2012 at 6:16am Hello Ted: just remembered I talked this particular owner into turning their gas water heater down. Even this has backfired on me, 'cause every time I visit I must remember to turn it back up! Have a great weekend, t
ps: my offspring is purchasing a new home from KB Homes, energy star awardee. thank the lord!
LOL. Please give me his number!
Seriously, I think people who earn under $150k per year ARE interested because spending $1000 - $3000 too much on energy is a big deal to them. But they simply don't know the opportunity is that big. They have no way to measure. (I have a simple calculator, and blogged about this)
With On-Bill financing people can now update and increase the comfort and value of their homes, gain some control over future energy obligations, and not change their cash flow situation by $1. The energy savings pays for the improvement.
But I have relatives and friend with nose bleed incomes, and chasing savings here represents negative return on time invested for them. So if that's your primary client I'd say even calling the utility co attempting to discover total cost probably is time you'll never earn compensation for.
Comment by Tom Delconte on April 5, 2012 at 11:30am Ted, yes, it's not my energy bill, the homeowner's not complaining, and they don't care about the cost. This is not a paradigm. This is typical behavior of people in the U.S. It's just not a place where people want to save money on energy costs. It's a status symbol to have high costs to some people! I'm not responsible for this. Remember when John McCain was asked how many houses he owned? Turns out it was 13! All due to the fact that his wife is the daughter of a beer distributor! He's the next customer you want, that's a real opportunity, not me or the people I assist occasionally with light maintenance.
I know dude,
"Not my energy bill, and the homeowner's not complaining" is the predominant paradigm. And those guys don't care that they're spending 4x what's reasonable to heat houses they don't live in but 1 week a year - so how do you turn this into opportunity for paid work?
I don't know the answer. But if you CAN get an idea of annual spend from the utility, you might be surprised that some of these folks are open to discussion.
Comment by Tom Delconte on April 5, 2012 at 10:38am Well, if $5000 energy cost doesn't represent a problem to you, I guess there are no problems.
To me that represents a problem and an opportunity.
And if you don't know what the consumption is, maybe this is a hole in how you judge if problems exist.
Comment by Tom Delconte on April 5, 2012 at 10:19am Repeat: there are no problems! How could a overly well-maintained house that looks like this ever have a problem? Repeat: gas and electricity costs are not issues. Sorry, no INSTALL here. That's why: i'm just a blogger who doesn't use numbers, as they inhibit real human communication! As I posted on Alison Baile's last article: Yes, and it's also possible that entropy production will cease and the universe will achieve heat death in our lifetime. In other words, nothing really matters.
Hey Tom,
Are you looking in the wrong place for problems? Looking at the crawlspace and not seeing problems doesn't necessarily mean the crawl space doesn't represent huge problems. It may just mean you don't have access to the correct tools to determine/diagnose health - in this case, the energy bill.
Think you can get annual therm consumption if you call the utility? Or possibly back into it if they'll only give you the gas budget? (We can only get "monthly budget" for other people's homes from our utility).
Where I am I would say the home has an unrecognized problem - one that might be significantly attributable to that crawl space - if they spend more than $1000 per year on gas (particularly with that occupancy). But we are at $1.05 per therm and in a colder climate, two variables you'll need to adjust to.
So, how close are they to 1000 therms? That gives a rough starting point.
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