This paper presents a proposal for a standardized method for creep tests and techniques for predicting densities necessary to prevent settling of loose-fill insulation in walls. Experimental techniques and a theoretical framework needed for determining the associated creep parameters are described.
The theoretical framework allows a quantitative approach to the problem of achieving non-settling of a loose-fill insulation material in a given wall.
The theory leads to a set of equations to estimate stresses in a loose-fill insulation material as a function of the geometry of the wall, material parameters for the loose-fill insulation material and friction coefficients between the wall and the loose-fill. A theoretical description of creep and a technique that allows the determination of the relevant material parameters from the proposed creep tests is shown together with the test results. Furthermore, the necessary loose-fill density for long-term stability in a wall exposed to varying relative humidity is predicted.
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