Roofing System Spandrel Framework Loft Space
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Solution Overview
Problem
Traditional roofing systems using trussed rafters are heavy, inefficient in space usage, and labor-intensive to assemble, with critical tolerance issues and high material costs, while existing modular systems require extensive screwing and nailing, making them time-consuming and costly.
Innovation Solution
A method involving the use of pre-fabricated spandrels and ceiling panels with integrated insulation, where roofing panels are fixed between spandrels with flitch beams for load transfer and butt-jointed with long screws, allowing deeper panel depths for increased insulation and reduced material thickness, thereby reducing weight and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional trussed rafters are used to construct the roof, then the roof structure is strong and stable, but the roof takes up a large amount of space and is heavy, rendering the loft area unusable
Solution Approach 1:
The roof structure is segmented into separate functional components: the structural framework (spandrels and roofing panels) is separated from the insulation and ceiling functions. This allows the loft space to be used for storage or accommodation while maintaining structural integrity through the distributed spandrel framework.
Solution Approach 2:
The spandrels extend vertically beyond the roof slope to create three-dimensional structural elements that provide both roof support and loft space definition. This vertical extension creates usable loft volume without compromising the horizontal spanning capability of the roof structure.
2Ease of manufacture
If preconstructed panels with insulation are used in the modular roofing system, then insulation is built into the panels in the factory, but the panels are heavy requiring considerable screwing and nailing to restrain them
Solution Approach 1:
The insulation is extracted from the roofing panels and placed separately in the loft space. This eliminates the need for heavy preconstructed panels while achieving the same insulation function, thereby reducing assembly complexity and time.
Solution Approach 2:
The spandrels are preconstructed in the factory with precise dimensions and connection details, allowing for quick on-site assembly. The roofing panels are also preformed but kept lightweight by excluding insulation, enabling rapid installation without extensive fastening operations.
3Temperature
If deeper roofing panels are used to increase insulation depth, then thermal resistance is improved, but thicker timbers are required increasing cost and weight
Solution Approach 1:
The roofing system uses composite construction with lightweight timber spandrels and panels combined with separate insulation material placed in the loft space. This achieves high thermal resistance without requiring thick timber sections, reducing both weight and cost while meeting modern building standards.
Data Source
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AI summary
A method of constructing a roof on top of a building, the method comprising: fixing two lower spandrels, one on each of two opposite sides of the top of the building, the lower spandrels each having an upper and a lower parallel side and two sloping sides; fixing ceiling panels to the upper parallel sides of both of the spandrels to form a platform; fitting upper spandrels above the respective lower spandrels on the ceiling panels; and fitting gable to gable roofing panels to bridge the gap between the sloping sides of the spandrels to form a roof.