healthy space crawlspace fix to damp, wet, moldy, and unhealthy crawlspace
DESCRIPTION
A must see if you think you crawlspace is making you sick. From mold, insects, water, or odors. The best way to fixes these problems.TRANSCRIPT
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Crawl Space Science
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Over 250,000 new homes and thousands of additions are built
each year with dirt crawl spaces.
There are now 26 million of them.
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There is no shred of evidence or science that says vented
dirt crawl spaces make sense
– and tons of evidence, right before our eyes, that says they
are a serious problem.
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A home costs money to operate – to heat and cool, and to maintain.
A vented dirt crawl space raises your heating and cooling cost 15% (to 25%) every month, and makes it very likely
you’ll have a big expense for mold removal and/or rotted wood replacement
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Buyers Expect a Dry Crawl Space
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Crawl Space Terms of the Trade
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Moisture in the Crawl Space
Dirt Crawl Space Problem
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The problem is moisture inside of a building – particularly because a building is made from organic materials, filled with objects made from organic materials, and lived in by people.
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Exposed earth adds a continuous stream of water vapor into your home.
Moisture From The Ground
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Moisture From The Ground
Groundwater leakage lays in a crawl space slowly evaporating into the house.
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Crawl Space Foundation TypesConcrete Block Walls
Hollow,
Very
Porous,
and Fills
with Water
! Hollow,
Very
Porous,
and Fills
with Water
!
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Crawl Space Foundation TypesPoured Concrete Walls
Cracks & P
orous!
Cracks & P
orous!
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Crawl Space Foundation TypesStone Walls
Leaks Wate
r & Air!
Leaks Wate
r & Air!
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Moisture From the Air
Relative humidity of air goes down by 2.2% for every
degree we heat it and up by 2.2% for every degree we
cool it.
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How Summer Venting Makes a Crawl Space Moisture Problem Worse
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“Water does very little to ruin a home with a dirt crawl space. It’s the water vapor that kills the house.”
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On hot days, we are venting our crawl spaces with hot air.
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On cold days, we are venting our crawl spaces with cold air.
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On wet days, we are venting our crawl spaces with wet air.
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Moisture inside your home is bad for what’s in it.
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Why are Crawl Space Floors Dirt Anyway?
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The only reason to build a home with a dirt crawl space is to save money
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But I never go down there,
so why should I care??
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You Breath Crawl Space Air – Like it or Not
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STACK
EFFECTSTACK
EFFECT
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Negative Effects of a Wet or Damp Crawl Space are:
“Just Add Water”
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Dust Mites: #1 Indoor Allergen
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Sticking – Swollen Doors & Windows
Can’t get
in?Can’t
get
in?
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Smelly Damp Carpets
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Buckling Hardwood Floors
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Condensation/Rotting/Mold in your Attic
-As humid air escapes into your attic it can condense against the cold ceiling or roof.
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Frost or Condensation and mold on the inside of windows in cool weather
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Increased Energy Bills
Damp air takes more energy to cool in the summer and heat in the winter.
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Mold Upstairs
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Decreased Life of Roof Sheathing & Shingles
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Decreased Life of the Painton the outside of your house
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Aggravated Asthma & Allergies
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Ducts in a Dirt Crawl Space – More Bad News!
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Ducts Bring Crawl Space Air Upstairs Easily!
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Ducts that are wet from condensation rob you of energy
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Higher Energy Bills in a Dirt Crawl
Space
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Dirt Crawl Spaces make the air in your house damp, and damp air costs more to heat and cool
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If Light Can Get In, So Can Air
Air leaks where outside air can enter; a crawl space must be sealed.
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Fiberglass insulation does little when it’s either not in a closed cavity or when it’s damp
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When fiberglass insulation is just a little damp, it loses a whole lot of its insulation value
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Paper-faced insulation is “mold candy” – Mold loves paper even more than wood
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Mold needs 70% Relative Humidity & an organic food source to grow
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Mold will grow on paper & cardboard
1st, then plywood, and finally
on framing lumber
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Damp Leather – Sound the mold dinner bell!
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Wet load bearing girders and floor joists under attack by mold
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Health
ProblemsHealth
Problems
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Besides irritating people with asthma and mold allergies, studies show that prolonged exposure to mold can actually cause asthma.
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Who wants to buy a house with mold?
Nobody.
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Dust mites live upstairs,
but they thrive in homes with damp crawl
spaces
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Bugs & Critters Love Dirt Crawl Spaces!Bugs & Critters Love Dirt Crawl Spaces!
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What’s that White Chalky Powder?
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That white, chalky powder on your walls
is Efflorescence
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Dirt Crawl Space Solutions: 4 step solution
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Standing water needs to be addressed prior to the installation of CleanSpace
Step 1: Groundwater Leakage
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A Specially Designed Crawl Space Sump System Has Features Such As:
A sturdy liner made to mate with a lid.
An airtight lid.
A floor drain in the lid in case of a plumbing leak.
A reliable cast-iron pump with mechanical float switch.
A stand under the pump.
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The SmartSump
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The SmartDrain
Warns of interior leaks
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What if the pump fails?What if the power goes out?
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A Battery Back-up Pumping System
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Generators
A generator is only a good idea if you have an automatic one permanently installed
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In extreme cases you can dig a trench and install a perforated PVC drainage pipe.
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Zero Tolerance for Crawl Space Water?
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Triple Pump ProtectionThe King of Sump Pumps
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Freezing Discharge Lines
IceGuard
Snow, no problem. Patented IceGuard solves the problem of frozen discharge lines.
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Dirt Around Foundation Settles
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Keep Gutters Clean!
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Downspouts
Unsightly
tripping h
azard!
Unsightly
tripping h
azard!
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LawnScape Outlet
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RainChute EZ
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Step 2: Isolate the HouseFrom the Earth
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The Solution MustThe Solution Must Stop water vapor from flowing up from the soil Stop water vapor from flowing through or off the crawl space
walls Allow water to drain from the walls to the sump location Allow water to drain from the floor to the sump location Not get ruined when someone crawls on it Be durable, so it lasts as long as the house does Be affordable Bonus* Be treated with an anti-microbial ingredient so mold
and bacteria will not grow on it.
There are 2 basic approaches – a concrete floor and a plastic liner.
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Pros & Cons of Concrete Floors
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Stop water vapor from flowing up from the soil Stop water vapor from flowing through or off the crawl space walls Allow water to drain from the walls to the sump location Allow water to drain from the floor to the sump location Not get ruined when someone crawls on it Be durable, so it lasts as long as the house does Be affordable Bonus* Be treated with an anti-microbial ingredient so mold and
bacteria will not grow on it.
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Concrete? Not the SolutionConcrete floors, unless combined with ways to drain the walls and floor, and ways to stop the water vapor from the
walls and floor, are not the answer.
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This home had a 6 mil polyethylene ground cover, but it had holes in it and it wasn’t sealed at the perimeter up the walls,
so the house rotted anyway.
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“Extreme Makeover – Crawl Space Edition
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CleanSpace is a 20 mil thick plastic liner, similar to a pool liner, that can be fitted in your crawl space to
completely seal off your home from the earth.
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Crawl spaces with existing concrete floors
can be treated in the exact same manner
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A dimpled polyethylene membrane under the CleanSpace liner allows water to flow to a sump
in a crawl space that already has a concrete floor.
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Radon Gas
CleanSpace is a passive Radon reduction system. (If an “active” system needs to be installed, a fan
can draw air from below the CleanSpace and exhaust it outside above the highest eave.)
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Step 3: Seal Out theOutside Air
The CleanSpace vent covers seal the air out, insulate, and improve the appearance.
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The Crawl Space Access DoorShould Seal Tight
Before. Rotting, loose-fitting, warped After. A snug-fitting, all-plastic door
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Block walls are most common in dirt crawl spaces
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Seals the top of block walls.
CleanSpace WallCap
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Once the liner is installed and the vents and air
openings to the outside are closed, the crawl space
will begin to dry out. There is just one step left,
dehumidification...
Once the liner is installed and the vents and air
openings to the outside are closed, the crawl space
will begin to dry out. There is just one step left,
dehumidification...
Step 4: Keeping Crawl Space Air Dry
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Not Just Any Dehumidifier
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The SaniDry is a high-capacity, high-efficiency dehumidification system, with air filtration, in a single unit.
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The SaniDry Air System wrings your air dry, and its powerful blower moves that dry air out
into and around your crawl space. This dry air then dries your building materials
and contents, which makes the damp smell and damp feeling go away!
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It filters particles out of the air smaller than any mold spore or dust mite dropping
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Open Sump Hole?
This is a
Humidifier
!This is a
Humidifier
!
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Question:What Makes a Crawl Space Smell Musty?
Answer = Mold
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Floor Insulation – Yes? or No?
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Duct LeakageFirst Your Enemy,Now Your Friend.
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Conditioningthe Crawl Space
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If the crawl space is completely sealed, you can condition it by constantly blowing a small amount of
air from upstairs into the crawl space.
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Crawl-O-Sphere Air Machine
Not as effective as a SaniDry, but a lower-cost alternative for conditioning the crawl space.
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Combustion Appliances
You must not depressurize a space where combustion appliances are located!
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One easy way to provide combustion air is to install
two vents in the crawl space ceiling to the first floor.
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Crawl Space No - No’s Don’t put a vapor barrier or rigid insulation board on the ceiling of
your crawl space
Don’t close vents without sealing the earth.
Don’t seal the earth without closing the vents.
Never use a fan to blow outside air into your crawl space.
Never use a fan to blow air out of your crawl space. Don’t install a liner or concrete without removing organic material
such as wood, cardboard, insulation, etc., from the dirt floor first. Don’t depressurize a space that has combustion appliances (more
than one pascal).
Don’t run your dryer vent into your crawl space.
Don’t ignore the problem.
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Building Code Lies
The building code allows dirt crawl spaces that are vented. In fact, they require them to be vented. Recently in the 2000 International Residential Code, they have added
exceptions to the venting provision.
One exception says “where warranted by climactic conditions, ventilation openings to the outdoors
are not required if ventilation openings to the interior are provided”.
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“This house was built according to Building Code”
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There is a document from the Department of Energy that
says vented dirt crawl spaces are wrong, and to close
the vents. It goes on to say that they recognize that this
is against the building code, so you might have to pull
some creative explanation to get by the local inspector.
Call it a “short basement”
Code says a basement doesn’t require venting!
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Crawl Space Science
Q & A Session