Keep it Dry and Ventilated
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Transcript of Keep it Dry and Ventilated
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Keep it Dry and Ventilated
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Steps to Healthier Homes
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Keep It:Dry CleanPest-Free VentilatedSafe Contaminant-FreeMaintained
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IOM Report Mold & MoistureRelated Health Effects
Upper respiratory tract symptoms
Coughing Wheezing Asthma symptoms Hypersensitivity
pneumonitis
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IOM Report Mold & MoistureRelated Health Effects
Upper respiratory tract symptoms
Coughing Wheezing Asthma symptoms Hypersensitivity
pneumonitis
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Dampness and Asthma
Health Outcome Estimated % Increase in Damp Homes
Upper respiratory tract symptoms
52%
Cough 50%
Wheeze 44%
Current asthma 50%
Ever-diagnosed asthma 33%
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Moisture Sources Poorly managed rainwater/groundwater
— Poor roof, wall, window and foundation drainage— Defects in rain barriers
Plumbing leaks Household sources & condensation
— Surfaces chilled by mechanical equipment, earth contact, outdoor air contact
— Unvented space heaters— Showers, cooking, breathing
Air transported moisture Crawl space moisture or exterior humid air
Construction moisture
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WET TO DRY
WINTER
WET TO DRY
SUMMER
WET TO DRY
Moisture Moves…
Source: Advanced Energy
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HOT TO COLD
WINTER
HOT TO COLD
SUMMER
HOT TO COLD
Moisture Moves…
Source: Advanced Energy
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Leaks(liquid)
How Water Enters a Building
Groundwater (liquid)
Air From Soil(water vapor)
Cooking,Bathing,WateringPlants,Breathing,Washing(water vapor)
Surfacewater (liquid)
Outside Air Holes, Windows
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Windows Leak
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Plumbing Leaks
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Drain pan in the event of heater leak
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residence
Po
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RH
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Damp Foundation
Mopping/Plants
Bathing
Cooking
Respiration
Unplanned
Vent
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Ducted ok?
Damper work?
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Unsealable recessed light allows warm, moist air into the unheated attic.
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Failed drainage systems.
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Mold in the air conditioner?
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Crawlspaces may contain mold, pests, pesticides, asbestos, lead paint and sewer gas. An apparently dry crawlspace can add excessive water vapor to a house.
Bad Crawlspace
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Good Sealed Crawlspace
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Moisture meters are useful in determining whether a material is wet or not and tracing the source of problem water.
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Address Interior Moisture First
Moisture where you don’t want to insulate – attic sheathing
Wet walls Etc
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Moisture Assessment Wet spots/water – inside and outside Mold/stains/rot – inside & outside Condensation/humidity – attic, living space,
windows, basement/crawl space— Warning Signs: greater than 65% Rh in when
AC on or greater 55% Rh inside when temp <45 degrees
Always ask: what’s the moisture source and likely fix
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WAP Eligible Moisture Expenses
Limited repairs for water damage & mold creating conditions, when necessary to ensure the long term durability of the measures (e.g., roof repair, downspout, dryer/bath ventilation)
Defer: Severe mold and moisture issues No: Mold testing not funded.
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Ventilate
Fresh air inlet/outlet
Ventilation intakeand exhaust
Bath and kitchenexhaust vents
Combustion vents
Dryers
Central vacuum outlet
Chimneys
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Ventilate Combustion
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Local exhaust
Furnace-Dryer-Bathroom-Kitchen
Whole House Ventilation-Run exhaust continuously-Provide fan powered outdoor air
Source: Camroden Associates
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Test Exhaust Fans Do They WorkThe Charmin Method
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Fan Flow MeterA fan flow meter connected to a manometer measures fan flow. Needed for ASHRAE 62.2 calculations and to verify CFM of newly installed fans.
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Energy Star Fans & Timers
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Filter Cooled or Heated Air
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Poorly sealed filter access panel
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MERV
Minimum Efficiency Rating Value (MERV)
ASHRAE Standard 52.2 – Efficiency in collecting very small particles
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MERV PARTICLE TYPICAL CONTROLLED SIZE (m) CONTAMINANT
1 – 4 >10.0 Pollen, sanding dust, textile and carpet fibers
5 – 8 3.0 – 10.0 Mold, spores, hair spray,cement dust
9 – 12 1.0 – 3.0 Legionella, lead dust, welding fumes
13 – 16 0.3 – 1.0 Bacteria, most tobacco smoke, insecticide dust, copier toner
17 - 20 0.3 Virus, combustion particles, radon progeny
MERV Ratings
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CFM50 = 4000
CFM50 = 2000
Desired ventilation = 75 CFM
CFM50 = 1000
CFM50 = 1000 + 75 CFM fan0
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Outdoor Temperature, degrees F
Single-story 1500 ft2 house
Chart courtesy of Paul Francisco
Leaky Homes May NOT Ventilate Right
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ASHRAE 62.2 Point Source
Point source ventilation—Bath:
50 cfm on demand OR 20 cfm continuous
—Kitchen 100 CFM on-demand OR 5 ACH, based on kitchen volume. 12’ x 14’ x ␣
7.5’ kitchen requires 105 CFM.
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62.2 Whole House Ventilation New Homes
Floor Area (ft2)
BEDROOMS
0 - 1 2 - 3 4 - 5 6 - 7 >7
< 1500 30 45 60 75 90
1501 – 3000 45 60 75 90 105
3001 – 4500 60 75 90 105 120
4501 – 6000 75 90 105 120 135
6001 – 7500 90 105 120 135 150
> 7500 105 120 135 150 165
Courtesy of DOE WAP & Rick Karg of R.J. Karg, Associates
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Alternative Compliance Existing Bdgs
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CFMfan = 0.01Afloor + 7.5(Numberbedroom + 1) + (spot ventilation deficit) - (Infiltration credit)
3 Key Steps: Determine whole house continuous requirements = 0.01A +
7.5 * # occupants Calculate the spot ventilation deficit from require bath &
kitchen cfm/4 (measure fan flows) Calculate the infiltration credit (post WAP blower door cfm 50
estimate)
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Sample 62.2 Compliance
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• 1500 ft2, 1 story• 3 bedrooms, 4
occupants• Norfolk, VA• Bath 20 CFM• Kitchen 70 CFM• 1250 CFM50 Post
WorkNeeds 38 CFM
Solutions: ERV; added bath fan CFM
50 – 20 (fan) – 20 (window) = deficit 10
100 – 70(fan) – 20 (window) = deficit 10
Source: US Dept of Energy WAP Standardized Training Curriculum
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62.2 Compliance Samples
Original home, but 2000 ft2 instead of 1500, in Portland, ME? – needs 46 CFM, Solutions: increase bath fan CFM & possible added fan in hallway; HRV
Wisconsin study showed 62.2 compliance required added ventilation in about 3/4 of weatherized homes.
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Which system is right?• Heating areas - exhaust only.• Cooling areas supply only.• Intermediate areas – where
heating and cooling seasons are both significant – require balanced systems.
• A balanced system is technically acceptable – it will work - anywhere.
Source: US Dept of Energy WAP Standardized Training Curriculum
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Exhaust only vs. HRV in a cold climate. Annualized cost = Installed cost/lifetime + annual operational costs + annual heating (or cooling) penalty.
Cost-effectiveness
Fan Type Installed Cost
Lifetime(yrs)
Operational cost/yr
Heating penalty/yr1
Total annualized cost
Exhaust only, 20 CFM
$400 10 $30 $1,123 $1,192
HRV, 20 CFM
$800 10 $200 $550 $830
Based on oil @ $4/gal burned at 80% efficiency in 6500 HDD climate.
HRV assumed to reduce heat lost from exhausted air by 50%.
Source: US Dept of Energy WAP Standardized Training Curriculum
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62.2 Compliance Summary The natural ventilation calculation we’ve used for years is
flawed when dealing with weatherized homes. Re assess your building tightness limit now that you need to
add ventilation. ASHRAE 62.2 is a performance standard – fan flow must be
measured. The math to compute the required fan flow can seem
complicated, but is really a series of simple steps. Computer programs are available – some are free. The chosen ventilation method has to match local
environmental conditions.
46Source: DOE WAP
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Ventilation Assessment Is existing ventilation working:
—Bath fans exterior exhaust? Flow rates?—Kitchen fans exterior exhaust? Flow rates?—Dryer exterior exhaust?—Filter ratings—Whole house ventilation
Does home meet ASHRAE 62.2 (existing buildings)?
Seal between attached garage & home
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WAP Eligible Ventilation Expenses
Meet ASHRAE 62.2 Specific actions under 62.2
—Bath fans—Dryer vents—Whole house ventilation —Seal connections to attached garage
Certain paradise climates are exempt
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EPA Protocols for Energy Upgrades
Minimum Actions? Added Opportunities?
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