The Brereton Lake residence is engineered as a hybrid structural system. Heavy timber framing defines the primary living volume, while conventional construction is utilized in bedrooms, sunroom and utility zones. This approach concentrates structural timber where span and spatial openness are required, and applies light framing where repetitive geometry improves efficiency and service routing.
The result is a defined structural core with clear load paths and controlled deflection, optimized for lakefront exposure and cold-climate performance.
Hybrid Structural Zoning
The timber frame is deployed in the main living area, forming the primary roof support and architectural focal point. Bedrooms and service areas are conventionally framed, but remain structurally integrated through aligned bearing walls and diaphragm continuity.
Engineering coordination includes:
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Reinforced bearing points at timber-to-frame transitions
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Continuous roof diaphragm across hybrid junctions
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Aligned vertical load stacking into foundation
This configuration allows long-span performance in public spaces without overbuilding secondary areas.
30 ft King Post Truss: Long-Span Structural Mechanics
A large king post truss spans the full 30 ft width of the main living area. This is a substantial clear span for residential timber construction and requires disciplined engineering.
Structural behavior of the king post truss includes:
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Axial compression in rafters
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Tensile force in the central king post
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Horizontal thrust resisted by the tie beam
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Diagonal bracing stabilizing the assembly
Because the span reaches 30 ft, member sizing is calculated based on:
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Regional snow load
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Dead load from roof deck and insulation
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Wind uplift forces
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Long-term creep deformation
Deflection limits are controlled to prevent excessive ceiling movement or stress on glazing interfaces.
Connection detailing must resist combined shear and axial force. In this project, custom metal plates are incorporated at truss joints. These plates:
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Increase joint shear capacity
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Provide predictable load transfer
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Add rotational stiffness
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Reduce reliance on hidden steel reinforcement
The exposed metal plates contribute to a contemporary aesthetic while serving measurable structural function.
Open Living Volume with Lake Orientation
The central living area integrates a galley-style kitchen, island bar and dining space beneath the 30 ft truss span. Open-plan configuration requires structural independence from interior partition walls.
Engineering advantages include:
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Uninterrupted sightlines to the lake
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Flexible interior layout
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Reduced need for intermediate columns
Floor framing beneath the kitchen and island is reinforced to support appliance loads and localized live load concentrations.
The vaulted geometry increases vertical volume but requires lateral stabilization through roof diaphragm action and shear-resisting wall assemblies.
Conventional Framing in Secondary Zones
Bedrooms, sunroom and utility areas utilize conventional framing. This allows:
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Simplified mechanical routing
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Efficient insulation cavity installation
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Cost-effective construction
Where conventional walls support timber beams, top plates and studs are reinforced to resist concentrated reaction forces.
Moisture isolation detailing prevents differential movement stress between heavy timber and kiln-dried stud framing.
Environmental Load Considerations
Brereton Lake conditions impose:
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Snow load accumulation
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Wind uplift across open water
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Freeze-thaw cycling
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Seasonal humidity variation
Structural countermeasures include:
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Continuous vertical load paths from truss to foundation
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Uplift-rated hold-down anchors
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Reinforced beam-to-post connections
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Ventilated roof assembly
Creep deformation in the 30 ft king post truss is evaluated to maintain long-term serviceability and prevent joint loosening.
Foundation systems incorporate frost protection and drainage control to maintain stable bearing conditions.
Structural Summary
The Brereton Lake residence demonstrates disciplined hybrid timber engineering with:
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A 30 ft king post truss spanning the primary living volume
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Custom exposed metal plates enhancing structural performance
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Hybrid zoning separating heavy timber core from conventional framing
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Open-plan design oriented toward lake views
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Defined load path continuity in a cold-climate environment
This project illustrates how a large-span timber truss can anchor a contemporary lake residence while maintaining structural integrity, environmental resilience and architectural clarity.
