Double sash and heat insulation / heating that were comfortable even in winter. Forty sons buy a 50-year-old house (4)

The purpose of the double sash in my house is to be soundproof

As a premise, I must say that the double sash that was constructed after moving in at the author's house was introduced primarily for the purpose of soundproofing. Rather than rushing to make arrangements after moving in, the property was decided based on the idea that "if soundproofing measures can be taken firmly with double sashes, it is rather an ant property." The location is in front of the station and along the main road with a total of 5 lanes, and pachinko parlors and bars are lined up downstairs, so we have introduced a double sash as a means of protecting the environment in the house from such ambient noise.

In addition to the surrounding environment, the reason for sticking to soundproofing is that it is an old condominium that is over 50 years old. Generally, in condominiums, windows and sashes are often "common areas", and even if they are for sale, they cannot be easily changed. The aluminum sashes on the windows of the property I bought were still quite old. Whether the packing was deteriorated or not, there were lots of gaps, and sound and air could easily come in and out. The noise around the property is louder than usual, and the window sashes are not soundproof, so I tried to make the windows as quiet as possible by strengthening them to a modern content.

Specifically, "soundproof laminated glass" is selected for the glass of the added inner window (inner sash). This is a different type from the glass with excellent heat insulation effect used in energy-saving houses. In addition, the reason why all five windows in the property are double sashes is because of the soundproofing purpose of "not creating a weak point for sound to enter".

The basic features of the double sash, such as heat insulation and soundproofing, are realized by the layer of air created between the outer and inner windows. If the inner window is installed more inside and the "air layer" is made larger, the effect of heat insulation and soundproofing will be greater. The mechanism is the same as warm down with plenty of air inside. However, at the author's house where the outer window is squishy, ​​the work of the "air layer" cannot be expected, so the glass of the inner window to be added is a soundproof laminated glass, which is the primary purpose.