Whiteshell Bay is a five-bedroom, three-and-a-half-bath lake residence engineered around a 24 ft vaulted great room volume. The structural system combines king post trusses, a primary parallel chord timber truss, multi-level framing continuity, and a reinforced exterior envelope suitable for high-exposure lake conditions.
The residence is organized around a central structural spine that maintains defined load paths from roof diaphragm to foundation while enabling open sightlines toward the lake.
Great Room Vault: 24 ft Vertical Volume and Structural Control
The living room vault rises 24 ft above the main floor. Large vertical volume introduces amplified lateral forces, increased bending demand on roof framing, and higher uplift potential under wind exposure.
Key structural considerations include:
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Buckling resistance in tall posts
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Lateral bracing for vertical members
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Deflection limits for long-span roof assemblies
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Continuous load transfer from ridge to foundation
In tall vaulted spaces, unbraced column length increases risk of lateral instability. Timber posts are sized to maintain acceptable slenderness ratios. Lateral resistance is provided through diaphragm action at floor and roof levels.
The adjoining dining and kitchen areas maintain flat timber ceilings. These ceiling planes function as structural diaphragms that stabilize adjacent vertical framing while preserving visual continuity into the great room and lakeside glazing.
King Post Trusses and Parallel Chord Primary Support
Five king post trusses span the 20 ft wide great room. The king post configuration provides efficient load transfer through axial compression in rafters and tension in the central vertical member.
Structural functions include:
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Reduction of mid-span deflection
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Transfer of snow load to bearing supports
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Stabilization of roof geometry
The king post trusses bear on a large parallel chord timber truss that runs from the balcony to the lakeside wall. This parallel chord truss acts as a primary horizontal load distributor.
Engineering implications of this arrangement:
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Concentrated reaction forces at truss bearing points
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Increased bending resistance along primary span
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Redistribution of vertical load toward foundation-aligned posts
Parallel chord trusses are well suited for carrying significant uniform load over extended spans while maintaining dimensional stability. Connection detailing must resist shear forces and long-term creep deformation.
Balcony Hall and Upper-Level Load Interaction
An upper floor balcony hall overlooks the great room and contributes to lateral bracing. Elevated walkways introduce live load and potential vibration considerations.
Structural design addresses:
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Guardrail anchorage strength
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Floor diaphragm stiffness
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Shear transfer at balcony-to-post connections
The balcony level enhances structural redundancy by tying vertical elements together at mid-height.
Vaulted Family Den Above Garage
The family den located above the two-car garage introduces a mixed structural condition. The garage opening below requires beam spans capable of carrying upper-level loads without intermediate support.
Engineering measures include:
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Oversized glulam beams over garage door openings
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Concentrated load transfer into sidewall posts
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Vibration control for upper-level occupancy
Garage framing must also address fire separation requirements and moisture control at slab interface.
The vaulted ceiling in the den increases roof framing demand. Load paths remain aligned vertically to prevent eccentric stress accumulation.
Lakeside Window Wall and Thermal Envelope
Large lakeside windows introduce structural and envelope integration challenges. Window wall assemblies must resist wind pressure while maintaining air barrier continuity.
Critical performance elements include:
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Proper header sizing above glazing spans
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Integration of timber posts with window mullions
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Air sealing at structural penetrations
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Thermal break detailing to reduce bridging
South-facing or lakeside glazing may increase solar heat gain. Overhangs and timber outlook beams provide shading control.
Exterior Timber and Stone Detailing
The exterior envelope integrates stone cladding with heavy timber features including gable trusses, window wall timbers, and Nordic-style outlook beams.
Stone veneer introduces additional dead load to wall assemblies. Wall framing must account for:
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Increased vertical load
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Proper anchorage of masonry veneer
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Drainage plane integration behind stone
Nordic-style outlook beams extend roof projection and resist cantilever bending forces. These beams must be sized to limit deflection under snow load and wind uplift.
Exterior timber exposure requires:
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Moisture-protected end grain
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Flashing at beam penetrations
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Corrosion-resistant fasteners
Freeze-thaw cycling near lakes accelerates weathering. Proper drainage detailing prevents hydrostatic pressure buildup behind cladding systems.
Double-Posted Entry and Two-Season Sunroom
The double-posted entry establishes a strong axial structural statement while carrying roof loads and resisting lateral shear at the facade.
Load management includes:
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Axial compression in entry posts
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Braced connections at beam intersections
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Uplift resistance at exposed corners
The two-season lakeside sunroom operates as a transitional envelope element. It must handle:
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Solar heat gain
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Condensation risk at glazing interfaces
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Snow load on extended roof sections
Roof assemblies above the sunroom incorporate ventilated cavities to prevent moisture accumulation.
Environmental Load Considerations
Whiteshell Bay region presents environmental forces including:
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Snow load accumulation
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Wind uplift over open water
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Seasonal humidity variation
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Freeze-thaw cycling
The structural system responds through:
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Defined vertical load paths
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Parallel chord primary support for load redistribution
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King post truss geometry for span efficiency
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Reinforced foundation anchorage
Creep deformation in long-span timber members is incorporated into design calculations to maintain serviceability over time.
Structural Summary
Whiteshell Bay demonstrates advanced timber engineering applied to a multi-level lake residence with significant vertical volume and long-span framing.
Key performance outcomes include:
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20 ft clear-span great room supported by king post trusses
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Parallel chord truss acting as primary structural distributor
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Stable 24 ft vaulted volume with lateral control
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Integrated balcony and upper-level load continuity
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Exterior timber and stone envelope engineered for durability
The residence achieves structural clarity, open interior space, and environmental resilience through disciplined load path management and precise timber engineering.
