Joseph Lstiburek  Ph.D., P.Eng., ASHRAE Fellow

joe@buildingscienceconsulting.com

www.buildingscience.com

http://www.buildingscienceconsulting.com

  • Efficiency will do what we need.Buildingscience
  • 30% glass is a tipping point for need for good glass in commercial
  • 15% glass is the tipping point for need for good glass in commercial
  • Air exchange IS IMPORTANT for energy efficiency, tight is good.
    • Holes as big as Joe.
  • Where buildings leak
    • At intersections
    • Wall and roof
    • Window
  • Over ventilation is bad. Waste energy.
    • LEED credit to ventilate is bad.
    • Build tight and ventilate right.
  • Double Facades
    • Why build a green house.
    • To make it work need a succession that that is beyond possible.
  • Steel Stud is the best conduction for thermal transmission.
    • Insulate on the outside.
  • Laws
    • Heat Flow is from warm to cold
    • Moisture flow is from warm to cold
    • Moisture flow is from more to less
    • Air flow is from a higher pressure to lower pressure
    • Gravity acts down.
  • Vinyl wall coverings bad on exterior walls in air-conditioned buildings.
  • Building pressure is important to do right.
  • Walls can dry out (winter) and dry in (summer and winter).
  • Below grade wall can only dry in.
    • I perm is 2 coats of latex paint, not a plastic barrier.
  • Positive pressure blows out does not solve the vinyl problem.
    • Impossible to have uniform barrier.
    • Spot barriers: mirrors, marker boards.
  • Walls must
    • Control heat flow
    • Control airflow
    • Control water vapor flow
    • Control rain
    • Control ground water
    • Control light and solar radiation
    • Control noise and vibrations
    • Control contaminants, enveirmental hazards and ordors
    • Control insects, rodents and vermin
    • Control fire
    • Provide strength and rigidigy
    • Be durable
    • Be aesthetic
    • One other I misse
  • Wall layers in order of importance.
    • Rain control
    • Air control
    • Vapor control (open, closed or both)
    • Thermal control
  • Wall
    • Cladding
      • Looks good: Ugliness in not suitable
      • Ventilated
      • Sun protection
    • Control layers
      • Continuity
    • Structure
  • Roof
    • Ballast
    • Filter fabric
    • Control layer
    • Structure
    • “By others” Bad, Bad. Do not have on drawings.
  • Wall
    • Intuitional Wall
      • Cladding (Brick)
      • Drain cavity
      • Insulation
      • Membrane
      • Concrete block
      •  Metal channel
      •  Gypsum
      • Latex board
    • Commercial Wall
      • Cladding (Brick)
      • Drain cavity
      • Insulation
      • Membrane
      •  Non paper exterior gypsum
      • Steel stud
      • Gypsum
      • Latex board
    • Residential Wall
      • Cladding (Brick)
      • Drain cavity
      • Insulation
      • Membrane
      • Non paper exterior gypsum
      • Steel stud
      • wood channel
      • insulation in cavity
      • Gypsum
      • Latex board
  • Colder it is the more insulation is on the outside.
  • The wetter inside it is the more insulation is on the outside.
  • If you have not done it before, you do not know it will work until after it is done.
  • A leak in not a leak if the client never sees it.
    • Wrap water proofing into the windows.
  • Fluffy stuff in cavity is good for acoustics.
  • Put the thermal insulation on the outside.
    • Wall
      • Steel stud
      • Densglass
      • Spray on insulation
        • Standard window water control
        • cell foam insulation does not do water control.
  • Zone 5 need closed cell on none humidified buildings.
  • The better we are on energy conservation, the more we need to be concerned about humidity.
    • Need to focus on water penetration details.
    • Clip balcony, French balcony
    • Most lost now is through thermal bridges
  • Wall board: Zip
    • Tables on website for homes
  • Spay-On water membrane (good stuff)
    • Controls permeability
    • Must be applied above  40 degrees
    • Wet Flash and Tremco wet mastics
    • Wet applications are simpler to apply than metal flashing.
  • OSB is the Spam of wood
    • Use plywood
    • OSB in stucco system is bad.
  • Plywood breaths as it picks up moisture in the cold.
  • Membraine by certainteen, vapor retardent
  • Cultured Stone is lumpy stucco.
  • Felt are good Hockey stick
    • Tyvek, ok
    • Typar and others bad
  • OSB on stucco works with an air gap
    • Stucco wrap is the BAD for stucco wrap only.
    • Use stucco with felt paper over it.
    • Or wrap then paper backed stucco wrap.
  • Roof venting leads to ice damming if vents are install incorrectly.
    • In high snow areas need to insulate the overhangs.
    • Use a vented skin at the top
    • 2” for  something
  • With solid EPS must have overlapping joints to keep air flow stopped.
    • Needed vented skin on top.
    • Need an air barrier on roof
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