Darrell Paul

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• Presented by
• Darrell Paul
• October 2009

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2006 Fire code

• Drywall added to exterior walls
• Non-Vented Soffits
• Insulate drywall garages

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How to avoid Garage problems

• Insulations
• Air Barriers
• Vapour Barriers

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Garage Issues

• Durability of construction components
• Built with steel, plastic, concrete
• Wide temperature swings
• OH Door open or closed
• Wide humidity swings
• Controlled by homeowner
• Designed to resist and compensate

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Year end warranty issue?
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Garage Designs

• Bonus room versus no bonus room
• Attached versus detached garage
• Drop ceilings
• Cantilevers
• Insulation types

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Garage Envelope Principles

• Same as the house?
• Warm inside
• Cold outside

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Ceiling Poly without insulation
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No Insulation, Poly or Drywall
NO ADDED HUMIDITY
-140 C

• -150 C

90 RH
2-30 C
35 RH
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Garage Envelope Principles
Insulation, Poly Drywall
NO ADDED HUMIDITY
10 C
40 RH

• -150 C

2-30 C
35 RH
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Condensation

• Stops air contacting cold surface (No humidity at
  the can)
• Separates cold and warm (gradual cooling/warming)

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Bonus room insulation

• Air leakage from house
• Air leakage from heat ducts

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Garage Bonus Room
Warm Air

Dry cool air
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Makes a Great Filter !
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Location of Barriers

• Air Barrier
• Vapour Barrier
• Weather Barrier

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Vapour Barrier RED Air Barrier - GREEN
GARAGE
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Does spray foam eliminateproblems in garages?

• Is it 100 air tight?

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Location of Barriers

• Air Barrier
• Vapour Barrier
• Weather Barrier

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Vapour Barrier RED Air Barrier - GREEN
GARAGE
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Warmer surfaces
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Garage Envelope Principles

• Temperature ambient air surfaces
• Moisture Sources
• Humidity Vapour in the air

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Dew Point

• Do you need condensation to form to have mould
  growth?

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Humidity

• If you have no humidity in a structure would
  you need to insulate?

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Added Humidity

• Potential for condensation even with insulated
  walls
• Even small increases have huge impact

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Humidity Sources

• Garage to house man door
• Soil / Concrete moisture
• Construction moisture
• Floor drain
• Snow / Rain on vehicles in garage
• Misc stored items - Firewood
• Vac exhaust
• Snow / Rain blown in around openings

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Solutions

• Ventilation
• Warmer surfaces
• Proper location of air barrier
• Proper location of vapour barrier

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Garage Envelope Principles
Ventilate lower humidity
10 C
80 RH

• -150 C

2-30 C
65 RH
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Garage Envelope Principles
Ventilate lower humidity
10 C
40 RH

• -150 C

2-30 C
Air taken out is replaced with DRY exterior air
35 RH
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Conclusion

• Proper Location of vapour and air barriers
• Reduce chances of excessive humidity
• Ventilate the garage
• Install an inexpensive ventilation fan
• Install a Hygrometer
• Educate the customer in writing

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Questions?

• Thank you
• Contact Information
• Darrell Paul 403-586-1950
• darrell_at_qualistat.com