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ENERGY SAVINGS in buildings
AIR BYPASS LEAKS
AIR LEAK DETECTION TOOLS
APPLIANCE EFFICIENCY RATINGS
BASEMENT HEAT LOSS
BLOWER DOORS & AIR INFILTRATION
CATHEDRAL CEILING INSULATION
COMBUSTION AIR for TIGHT BUILDINGS
DEW POINT CALCULATION for WALLS
DEFINITION of HEATING & COOLING TERMS
DUCT SYSTEM & DUCT DEFECTS
ENERGY STAR PROGRAM
FLOOR RADIANT HEAT Mistakes to Avoid
FRAMING DETAILS for BETTER INSULATION
FREEZE-PROOF A BUILDING
GREEN BUILDING CONSTRUCTION
HEAT LOSS in BUILDINGS
HEATING COST SAVINGS METHODS
HOUSE DOCTOR, how-to be
INDOOR AIR QUALITY & HOUSE TIGHTNESS
INSULATION INSPECTION & IMPROVEMENT
LEED GREEN BUILDING CERTIFICATION
SOLAR ENERGY SYSTEMS
THERMAL IMAGING, THERMOGRAPHY
THERMAL MASS in BUILDINGS
WIND ENERGY SYSTEMS
WINDOWS & DOORS
WINTERIZE A BUILDING
This article discusses the question of exactly where to locate the outer edge of a wood-framed double wall for super-insulated building construction.
Added details discuss structural load capability of an offset wood framed wall, and insulation and vapor barrier placement on a wood framed wall.
Sketch at page top and accompanying text are reprinted/adapted/excerpted with permission from Solar Age Magazine - editor Steven Bliss..
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The text below paraphrases, quotes-from, updates, and comments an original article from Solar Age Magazine and written by Steven Bliss.
Four Detailed Questions & Answers About Double Wall Framing
The questions above referred to "Double-Wall Houses," in Solar Age Magazine, December 1982 and were answered the next April. The questions and the detailed answers by Steven Bliss remain current today. Readers should also refer to the wood framed double wall details in the sketch below.
1. In the Hughes double-wall wood frame structure design, the double wall overhangs the floor platform, bringing the outside surface of the exterior wall sheathing in line with the outside of the building's foundation wall below. (See sketch at left.)
The floor framing is set back from the outer edge of the foundation wall by 3 1/2 to 4 inches. The overhanging section of the double wall is supported by short 2x4's (red in the sketch) toenailed between the top of the foundation sill plate and the bottom of the plywood plate (green in the sketch).
Setting the load-bearing (inner wall) back from the band joist (rim joist) a few inches will, in most cases, not affect the sizing (nor load bearing ability) of the joists (and structure).
Hughes uses a treated-wood foundation system, ordinarily framing with 2x6 lumber for one story and 2x8 lumber for two-story construction.
A brick veneer would need to be supported by an additional thickness of foundation, whether the wall itself is wood or masonry. This section of the building foundation is often offset so that the brick wythe veneer can be carried down to or below grade. (Don't forget termite shields where appropriate and don't forget to provide weep openings in the veneer wall).
This double wall framing system allows the air/vapor barrier to run continuously between floors - around band joists and sill plates, reducing building air leakage and simplifying building sealing. The spaces outside the band joists are filled with insulation, keeping the vapor barrier towards the warm side of the insulation.
Here we include solar energy, solar heating, solar hot water, and related building energy efficiency improvement articles reprinted/adapted/excerpted with permission from Solar Age Magazine - editor Steven Bliss.
Continue reading at ENERGY SAVINGS MAXIMIZE RETURNS ON or select a topic from the More Reading links shown below.
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