This document provides information on weatherizing ranch and colonial style homes. It discusses identifying opportunities such as improving wall insulation from 1950s fiberglass batts to blown-in cellulose. Dense-packing cellulose can provide an air and thermal barrier. Split-level ranches require addressing two attic spaces and hatches. Colonials benefit from focusing on wall insulation, unfinished attic insulation and air sealing, and treating walk-up stairs. Attic ventilation and sealing chimney chases, vents and ducts are also covered. Heat pumps are an alternative to oil heating that can save up to 40% on costs.
1. Weatherizing
Ranch and
Colonial Style
Homes
1. Identifying Weatherization
Opportunities and
Challenges in a Ranch or
Colonial
2. Using Mass Save to make
these homes more energy
efficient!
2. Green Needham
Collaborative
In 2012, Green Needham and Next Step
Living have:
Signed up 850 residents for home energy
assessments
524 completed Energy Assessments in
2012
These assessments resulted in 155
weatherization jobs, which saved
homeowners on average $500/year
4. WEATHERIZATION
A comfortable, safe, and energy-efficient home requires
Continuous thermal boundaries and air barriers that are in contact
with one another. (US.DOE)
5. Ranch Style Homes
• Many Built from 1940’s to Today
• Easy To Install cost effective Insulation and Air Sealing
• Good Solar PV Potential!
6. Wall Insulation in a Ranch
Pre 1950: Possible that
only a 1” sheet of
aluminum foil like
insulation present
This can be improved
through blown in
cellulose
Post 1950, most likely
have a 3” Fiberglass
batt, which can’t be
improved on through
Mass Save and blown
in cellulose
7. Dense pack Cellulose: Air and
Thermal Barrier
Source:http://www.energysmartvt.com/media/dense-pack-insulation-exterior-
preparation-3-400x300.jpg
9. Split Level Ranch Features
2 Attic Spaces
2 Attic Hatches or
Doors
Changes in Ceiling
Height
10. Changes in Ceiling Height
IDENTIFYING & AIR SEALING THE BUILDING ENVELOPE
Attic
Not only is the top of
the wall uninsulated...
Conditioned Conditioned
Space Space
Graphic courtesy of Anthony Cox
11. Changes in Ceiling
Height
IDENTIFYING & AIR SEALING THE BUILDING ENVELOPE
The interior wall cavities
act as a chimney that
robs the house of heat
and conditioned air.
Graphics courtesy of Anthony Cox
12. Attic or Wall Hatches
An uninsulated attic
hatch is a gap in the
attic’s thermal boundary.
Air Barrier
Thermal Boundary
14. Thermadome
free with Air
Pull Down Stairs Sealing (Value
$200) Yearly
Savings $60
and Up!
Thin plywood only barrier to cold
attic. Big area of heat loss!!
15. Whole Home Fan Boxes
• Good for cooling in summer
• Can be Health and Safety In the winter, even with
Concern (Combustion Safety vents closed, area of
and BackDrafting) great heat loss! Treat with
Fan Box (Thermadome)
16. Colonial
Weatherization Areas
to Focus on:
Wall Insulation
Unfinished Attic
Insulation + Air
Sealing
Treating walk up
stairs to Attic
17. Walk-Up Attics
IDENTIFYING & AIR SEALING THE BUILDING ENVELOPE
If the homeowner
uses the
attic fairly often:
• The air and thermal
boundaries must be
established at the
stairs, stairwell walls,
and door to the attic
stairs.
• This approach leaves
the stairwell open to the
attic and outside the
conditioned space.
Graphic developed for the US DOE WAP Standardized Curricula
24. Attic Insulation: Open Blown
Cellulose
Source:http://www.buildinggreentv.com/files/images/atticInsulAweb.
preview.jpg
25. Air Barrier
IDENTIFYING & AIR SEALING THE BUILDING ENVELOPE
A mechanical chase
containing ducts can
break the attic’s
air barrier.
Air Barrier
Thermal Boundary
Graphic developed for the US DOE WAP Standardized Curricula
26. Air sealing Chimney Chases
Before After
1-2” Gap All Around Chimney: Add metal flashing and fire
Allowing energy to escape caulking to seal up the gap
from inside home
28. Ventilation
Bath fans Improperly
vented will cause
moisture problems in
attic
Will also recommend
adding an insulated
ventilation pipe
cover. Why?
1sf of ventilation for
every 300sf of attic
space
Propavents
29. Heat Loan Helps Support
HighEfficiency Heating Systems: Oil
Customers can save 40% in heating costs
by switching
Single
Pane to Double Pane Windows
Conversion: Least Cost Effective but may
be necessary with older homes
30. Heat Pumps
NSL has partnered with Mitsubishi to offer
their ductless mini-split heating and cooling
system
Why use a Total Climate Control:
• CONTROL: Room-by-room heating and cooling in a single unit
• AIR QUALITY: Filtered air circulation that improves indoor air
quality
• SAVINGS: Up to 40% less expensive to heat your home than oil
and more efficient cooling than central air or window units
• EASY INSTALL: No duct work or need to remove your current
heating system
32. Questions and Comments
Michael Cucchiara
Community Programs Manager
Next Step Living
917-612-9190
Michael.cucchiara@nextstepliving.com
Editor's Notes
This drawing shows how changes in ceiling height create gaps in the thermal and pressure boundaries.The top of the wall is uninsulated. Heat will flow from the conditioned space through the break in the thermal boundary up into the attic.
Often there is no wall cap in this kind of construction.The open wall top allows even more heat loss because the interior wall acts as a chimney, carrying conditioned air and moisture away from the conditioned space.
Need pic of Whole Home Fan Box
Since the attic stairs were used often, it was better for the client to keep the stairwell “outside,” which means dense-packing the stairwell walls with insulation.This worker (who is also a trainer) is drilling the holes in preparation of installing insulation.
Here, cellulose is being blown into stairwell walls.
Walls are insulated and plugs replaced.The door to the living space is weatherstripped and insulated.
Under Construction
The air barrier is continuous, but it is not in contact with the thermal boundary.A mechanical chase containing ducts can break the attic’s air barrier.When the air barrier and thermal boundary are not in contact with each other, air flows through insulation, bringing heat and moisture with it.Q: Where might you see this in a home? A: Interior walls without top plates, and in ducts, plumbing, and electrical chases. Q: Where does the heat travel? A: Click to reveal heat path.