Prefabricated Floor Assemblies with Rigid Foam Insulation
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Solution Overview
Problem
Existing insulated floor structures using fiberglass batts are labor-intensive to install, lack air or vapor barrier layers, can sag and compress over time, leading to reduced thermal insulation performance, and offer no structural rigidity.
Innovation Solution
Prefabricated insulated floor assemblies featuring I-joists and rigid foam insulation boards, where the insulation boards are positioned between the I-joists to maintain contact with the subfloor, providing structural support and an air/vapor impermeable barrier, and are assembled on-site to reduce installation labor and maintain thermal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fiberglass batts are used for insulation between floor joists, then insulation material is provided, but installation is very labor intensive
Solution Approach 1:
The rigid foam insulation boards are pre-cut to specific dimensions and pre-positioned between the I-joists during manufacturing, so that when the floor assembly is installed on-site, the insulation is already in place and requires no additional installation labor. This preliminary preparation of the insulation material resolves the labor-intensive installation problem.
Solution Approach 2:
The patent combines rigid foam insulation boards with I-joists and subflooring into an integrated floor assembly. The rigid foam boards serve dual functions as both insulation material and structural filler between joists, eliminating the need for separate insulation installation and improving overall installation efficiency.
2Reliability
If fiberglass batts are used for insulation, then insulation is provided, but no air or vapor barrier layer is present
Solution Approach 1:
The rigid foam insulation boards perform multiple functions simultaneously: they provide thermal insulation, act as an air barrier, and serve as a vapor barrier. This multi-functionality eliminates the need for separate barrier layers and provides greater building design flexibility compared to fiberglass batts which only provide insulation.
Solution Approach 2:
The rigid foam material combines insulation properties with barrier properties in a single composite material, whereas fiberglass batts would require additional separate materials for air and vapor barriers. This composite approach enhances building design versatility.
3Reliability
If fiberglass batts are used for insulation, then insulation is provided, but the batts can sag away from the subfloor over time
Solution Approach 1:
The rigid foam insulation boards are positioned between the I-joists and against the subfloor, where they are mechanically constrained by the structural framework. This physical constraint prevents sagging and maintains stable contact with the subfloor throughout the building's lifetime, resolving the position stability issue.
Solution Approach 2:
The patent changes the physical state of the insulation material from flexible fiberglass batts that can deform and sag to rigid foam boards that maintain their shape and position. This parameter change from flexible to rigid state ensures long-term stability and prevents insulation deterioration.
4Reliability
If fiberglass batts are used for insulation, then insulation is provided, but no structural rigidity is offered
Solution Approach 1:
The rigid foam insulation boards are integrated with the I-joist framework to form a composite floor assembly. The rigid foam fills the spaces between joists and bonds with the subfloor, creating a unified structural system that provides both insulation and enhanced structural rigidity, including rollover strength, whereas fiberglass batts provide no structural contribution.
Solution Approach 2:
The patent merges the insulation function with the structural function by using rigid foam boards that are part of the load-bearing floor assembly. The insulation material becomes an integral component of the structural system, simultaneously providing thermal performance and structural rigidity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution reduces installation labor costs, maintains insulation performance over time, enhances structural rollover strength, and minimizes water vapor condensation across temperature differentials, providing efficient and durable thermal insulation.
Implementation Method 1
prefabricated insulated floor assemblies featuring I-joists and rigid foam insulation boards, where the insulation boards are positioned between the I-joists to maintain contact with the subfloor, providing structural support and an air/vapor impermeable barrier
Implementation Method 2
are air and vapor impermeable to reduce the likelihood for condensation of water vapor across the temperature differential of the thermal envelope
Data Source
AI summary
Prefabricated insulated floor assemblies, methods for manufacturing such assemblies, and use of these floor assemblies in a building are described. The assemblies include a sheathing panel, I-joists, and rigid foam insulation boards positioned in a cavity formed by the sheathing panel and the I-joists.