Vintage apartment renovation 3 Sound insulation
One of the weaknesses of vintage mansions is their sound insulation. I will summarize the measures taken this time.
｜About sound insulation
Older buildings, such as vintage apartments, generally have thinner floors and less sound insulation than modern buildings.
At Mita Tsunamachi Park Mansion , sound-absorbing materials + anti-vibration double floors (placement floors) and living room carpeting are specified.
｜About the floor
Most of the floors are products that create a base on the legs with rubber. Select products based on sound insulation grade, etc. This time, I chose a type that lays glass wool under the floor.
However, if the method of construction is bad, it will not be very effective.
The mechanism of the okidoko is to separate the frame and the subfloor so that the vibration of the floor is not transmitted to the frame. The important thing is the fit with the wall.
The joint between the wall and the floor is usually fixed with a material called a joist. However, if joists are used at this time, the vibration will propagate to the frame and the meaning of the standing floor will be lost. To avoid this problem, system joists should be used instead of edge joists to avoid contact between the floor and the frame.
Even if you spend a lot of money to implement anti-vibration measures, it is meaningless if they are not effective. This is a point that requires close supervision.
(System joists. Fix the perimeter of the floor to this material, and cut the frame and edges.)
｜Inverted beams
At Mita Tsunamachi Park Mansion , a reverse beam runs through the center of each room. There is no floor space in the reverse beam section, so it is not possible to install a table.
However, since it is the central part of the living room, it is an important part for sound insulation.
In this renovation , system joists will be passed through the left and right sides of the reversed beam, a small amount of clearance will be secured above the reversed beam, and the plywood will be laid. However, the strength is insufficient when the plywood is floating in the air. It is normal to fill it with mortar or the like, but that will greatly impair the sound insulation.
Therefore, I made a hole in the plywood appropriately and filled the gap between the reverse beam and the plywood from the hole with urethane foam. By doing this, transmission of vibration can be suppressed and construction is easy.
These parts are invisible, but they are important. I think there is a great advantage for architects to be involved in renovations, not only for design, but also for improving performance.
