walls have no insulation

[msimerson]

information

• walls have 3.5" cavities
• INSULATION

procure materials

• buy 3" polyiso foam board insulation (buy foam board insulation #37)
  • wrap foam board in Tyvek to protect it ($160)
• buy furring strips for nailers
  • (314) 8' long 1x3 or 1x4
  • (20) 3/4" 4x8' plywood
• buy screws, qty estimate: 1548
  • 9" Wind Lock SIP Screws, $0.81 ea.
  • 9" Dekfast SIP screws, $0.35 ea.
  • Trufast
  • 9" Headlok Panel screws, $0.56 ea.
• buy new windows (windows are single pane aluminum framed #8)
• buy house wrap: (2) 9'x150' rolls, $217 @ Lowes
• have z-channel fabricated (300')
• buy insect screening

insulate cavity

• choose type (see options) (choice: dense-pack cellulose)
• hire contractor to dense pack the walls
  • get 3 bids
    • Arrow Insulation
    • Classic Pest Control & Insulation
  • select contractor
  • schedule job
• inspect & verify

walls todo

• house wall north insulate house wall north #93
• house wall east insulate house wall east #94
• house wall south insulate house wall south #95
• house wall west insulate house wall west #96
• great room wall east insulate great room east wall #92
• great room wall west insulate great room west wall #97
• garage walls garage is not insulated #4

wall cavity options

type	R-value	Material	Installed
dense-packed cellulose	13	$950	$2,500
closed cell spray foam	24	$7,000

References

• Department of Energy recommends:
  • "Uninsulated wood-frame wall: Drill holes in the sheathing and blow insulation into the empty wall cavity before installing the new siding, and add R5 or R6 insulative wall sheathing beneath the new siding"
• How to Install Rigid Foam Sheeting
• How to Install Rigid Foam Insulation Outside a House
• no siding is waterproof
  • provide paths for water to drain down and out
• Avoid reverse laps - higher layers always overlap lower layers