Take care of the insulation material as homogeneous, Though in authentic applications, rigid components have joints and also cracks. So, the U-price is often higher than what It could be In case the insulation behaved like a homogeneous product. Reference 2 gives assistance on calculating U-values. It may be observed https://outdoorsecuritylights17384.blog5.net/79214371/a-secret-weapon-for-window-retrofit-kit