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Poorly sealed windows allow heat to enter your home during the summer and cool drafts during the winter. ... most cost-effective ways to seal a window, as caulk is relatively inexpensive ...
Window insulation reduces heat transfer from one side of a window to the other. The U-value is used to refer to the amount of heat that can pass through a window, called thermal transmittance, with a lower score being better. [1] The U-factor of a window can often be found on the rating label of the window.
A film is attached to the window frame to trap a pocket of air between the glass and the film, creating a double-glazed system with an insulating gap of still air. Thermal conductivity of still air is 0.024 W/(m.K) and much lower than that of glass (0.96 W/(m.K)). [1]
A typical installation of insulated glass windows with uPVC frames. Possibly the earliest use of double glazing was in Siberia, where it was observed by Henry Seebohm in 1877 as an established necessity in the Yeniseysk area where the bitterly cold winter temperatures regularly fall below -50 °C, indicating how the concept may have started: [2]
UFFI provides little mechanical strength, as the material is weak and brittle. Before its risks were recognized, it was used because it was a cheap, effective insulator with a high R-value and its open-cell structure was a good acoustic insulator. Though it absorbed moisture easily, it regained effectiveness as an insulator when dried. [31]
Eight people on the Willow Green estate shared their concerns about stained walls, mould, or crumbling mortar in the eaves. One of them, Robert Degavino, 77, says his loft is full of black mould.
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