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Treating 1½ Story Homes
Adrian Scott WECC
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Five Crucial Junctures of the Story
y & a Half
Excerpted from The Journal of Light Construction, Volume 13, Number 11, August 1995
Compiled by:
Western Region Tech Team
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Finished Attic - Heated
Diagram excerpted from the Wisconsin Weatherization Field Guide
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1) Kneewall:
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2) Eyebrow Roof:
3) Cantilevers:
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4) Balloon Framed Gables:
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5) Balloon
B ll
F
Framed
d
Dormer Walls:
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Complete
C
l t
Boundaries
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Unheated Finished Attic
Open Unfloored
Floored
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C ll Beam
Collar
B
Attic
Atti
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Wh t Is
What
I a Kneewall
K
ll
• A short bearing wall intended to support roof rafters in
balloon framed homes
• In platform construction it can be a bearing wall or used
to eliminate unusable space in a room space
• This creates a space that can be used for storage this
can be heated or unheated if it is unheated this space
becomes a outer joist beam attic and a buffer zone even
if used
d ffor storage
t
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Atti Access
Attic
A
Scuttles
S ttl and
d Doors
D
• Need to be Insulated to the same R-Value as surrounding
insulation or maximum structurally allowable
• Must have a insulation dam surrounding scuttle
• Made of material that allows repeated access (plywood
lumber )
• Must have air seal and be mechanical fastened
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V ti l Atti
Vertical
Attic A
Access
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V ti l Attic
Vertical
Atti A
Access
Using R-11 duct wrap
Using R11 unfaced fiberglass batt
and house wrap
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• Insulated to the r-value of
the surrounding insulation
• Must be weather striped
and mechanically fasten
• May
M use a plug
l if access
does not allow you to
attach insulation to door
U i R10 poly
Using
l styrene foam
f
b
board
d
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Alt
Alternative
ti M
Methods
th d tto A
Access Atti
Attics
• Use gable or roof vents
• Remove siding
• Create access through kneewall
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G i i
Gaining
A
Access tto O
Outer
t JJoist
i t Beam
B
Atti
Attic
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Th
Through
haG
Gable
bl Vent
V t or R
Rooff V
Ventt
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C tti Through
Cutting
Th
h Kneewall
K
ll
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Thi k outside
Think
t id th
the B
Box
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A Blank
Bl k Sl
Slate
t
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Insulating and Sealing Kneewalls Using
Polyisocyanurate Board
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Insulating and Sealing Kneewalls
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I l ti with
Insulating
ith T
Two-Part
P tF
Foam
Photo courtesy of the US Department of Energy
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D ill andd bl
Drill
blow
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I
Increase
Effectiveness
Eff ti
bby:
• Prevent wind washing of attic insulation by installing
blocking and baffles at perimeter.
• Cover batts on all six sides to prevent air movement.
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Seal Before Installing Fiberglass Batt Insulation
• If installing fiberglass, seal
seams and around outlets at
the pressure boundary
• In this case, seal from the attic
side where no one will see
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U i Insulweb
Using
I l b andd Bl
Blown C
Cellulose
ll l
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Tyvec andd D
Dense Pack
P kC
Cellulose
ll l
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B ilt i B
Built-in
Bookk Sh
Shelves
l
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Unheated Finished Attic
Open Unfloored
Floored
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ALIGNING PRESSURE & THERMAL BOUNDARIES
K
Kneewall
ll Attics
Atti
Open Wall Cavities
MAIN ATTIC
KNEEWALL ATTIC
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G
General
lG
Guidelines
id li
Ai
Air Sealing
S li & Attic
Atti Prep
P
The Daily Green
Energy Blast Services
GAPS ≤ 1/4”
Caulk
GAPS 1/4” – 3”
Spray foam
OTHER
Foam board,
fiberglass in plastic
bags, etc.
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H t/Th
Heat/Thermal
lE
Envelope
l
• Thermal Boundary
• Pressure Boundary
• THEY MUST BE ALIGNED IN ORDER FOR THE
HOUSE TO WORK EFFECTIVELY
• SAFETY
• DURABILITY
• COMFORT
• EFFICIENCY
• THIS IS YOUR GOAL AS A TECHNICIAN
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B f
Before
We
W gett Started
St t d
• Investigate/ Identify concerns
• Plan Were we are Going to insulate
• Make sure we have the right equipment
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Wh t tto llookk ffor
What
•
•
•
•
•
•
•
Structural condition of interior and exterior
Holes on the inside and outside
Ductwork
Slope ceilings (open ends or capped)
Do bypasses run from attic to basement
Hidden attics
Openings around bathtub
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