An analytical model for settling of attic loose-fill thermal insulation can be helpful for both interpretation and prediction of observed settling behaviour. The prediction of the settling process in a model is also valuable, when estimating the thermal conductivity and thermal resistance of the loose-fill insulation after a certain life time.
This paper presents a mathematical model for settling of attic loose-fill thermal insulation, which has been developed from a four element model representing three settling factors. These factors are insulation density, climate of the attic and vibrations of the building structure. One element represents moisture change of the attic loose-fill insulation material and another element represents vibrations of the building structure.
Settling data from ten years of field observations were used to obtain coefficients needed by the model. The resulting equations were used to predict the amount of settling for cellulose fibre and mineral fibre insulations for a 30 year perod.
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