Myths of Attic Ventilation An Intro to Night

In achieving our ventilation goals there are…. . • Materials limitations • Workmanship limitations

Myth #1: • What works in one area will work in all areas. 4

Myth #2: • There is only one way to do something in any given

Myths of Attic Ventilation & An Intro to Night Sky Cooling Myths of Attic

Fall 9/29/ 2015 Myths of Attic Ventilation © Charles Buell, Charles Buell Inspections Inc

Myths of Attic Ventilation © Charles Buell, Charles Buell Inspections Inc 8

Spring 4/9/ 2017 Myths of Attic Ventilation © Charles Buell, Charles Buell Inspections Inc

Myths of Attic Ventilation © Charles Buell, Charles Buell Inspections Inc 10

You can have frost “outside” standard frost expectation dates. (Shoreline, WA) 26 7 26

Myths of Attic Ventilation © Charles Buell, Charles Buell Inspections Inc 12

Myths of Attic Ventilation © Charles Buell, Charles Buell Inspections Inc 13

Myths of Attic Ventilation © Charles Buell, Charles Buell Inspections Inc 14

Myths of Attic Ventilation © Charles Buell, Charles Buell Inspections Inc 15

Photo curtesy of Jonathan Quigley, All Island Home Inspections Myths of Attic Ventilation ©

Myths of Attic Ventilation © Charles Buell, Charles Buell Inspections Inc 17

So why does mold growth tend to show up more on the North side

And the solution is? ? Myths of Attic Ventilation © Charles Buell, Charles Buell

• Treating the surface with wood preservatives • Insulation on top of the

If you want to learn more about how night sky radiational cooling works, this

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Myths of Attic Ventilation & An Intro to Night Sky Cooling Charles Buell Part 1 of 7 Myths of Attic Ventilation © Charles Buell, Charles Buell Inspections Inc 1

The Moving Target 2

In achieving our ventilation goals there are…. . • Materials limitations • Workmanship limitations • Cost/Benefit limitations • Codes ahead of the curve • Codes behind the curve 3

Myth #1: • What works in one area will work in all areas. 4

Myth #2: • There is only one way to do something in any given area. 5

Myths of Attic Ventilation & An Intro to Night Sky Cooling Myths of Attic Ventilation © Charles Buell, Charles Buell Inspections Inc 6

Fall 9/29/ 2015 Myths of Attic Ventilation © Charles Buell, Charles Buell Inspections Inc 7

Myths of Attic Ventilation © Charles Buell, Charles Buell Inspections Inc 8

Spring 4/9/ 2017 Myths of Attic Ventilation © Charles Buell, Charles Buell Inspections Inc 9

Myths of Attic Ventilation © Charles Buell, Charles Buell Inspections Inc 10

You can have frost “outside” standard frost expectation dates. (Shoreline, WA) 26 7 26 Frost Guaranteed 6 Frost is a Possibility Frost Due to Night Sky Radiational Cooling Myths of Attic Ventilation © Charles Buell, Charles Buell Inspections Inc 25 2 11

Photo curtesy of Jonathan Quigley, All Island Home Inspections Myths of Attic Ventilation © Charles Buell, Charles Buell Inspections Inc 16

So why does mold growth tend to show up more on the North side of the roof than the South side of the roof? Myths of Attic Ventilation © Charles Buell, Charles Buell Inspections Inc 18

• Treating the surface with wood preservatives • Insulation on top of the roof sheathing • Hot roofs (insulation directly applied to the underside of roof sheathing). 20

If you want to learn more about how night sky radiational cooling works, this is the major treatise on the subject: Why Wood Frame Attics Get Wet & Moldy in the Pacific Northwest Myths of Attic Ventilation © Charles Buell, Charles Buell Inspections Inc 21