Take care of the insulation materials as homogeneous, Whilst in actual purposes, rigid products have joints and even cracks. Hence, the U-value is typically larger than what it would be When the insulation behaved for a homogeneous materials. Reference two gives direction on calculating U-values. calculated and entered in to https://beauty-products00986.bloginder.com/35475065/a-secret-weapon-for-window-retrofit-kit