II. Improve quality of living

1. Noise Control
   noise reduction: Noise usually caused by upstairs occupants when moving of chairs / tables, steel cup/plastics cup, spoon, glass ball dropping onto stoneware or wood floors. By installing HP2500 system at upstairs, such noise caused at downstairs shall be reduced averagely 50%.or more than without HP2500.
   
   A noise reduction test conducted in a high-rise residential building, HP2500 installed on slab and top-finished by stone tile (stone tile/HP2500) vs. same stone tile installed onto floor slab (stone tile/slab) same room at upstairs.
   subjects for testing: steel cup dropped from 40 CM height, each 30 times.
   noise source from upstairs, sound receiving at downstairs.

background sound at downstairs: avg. 40 dB sound received at downstairs by steel cup dropped on stone tile/slab: avg. 70 dB sound received at downstairs for steel cup dropped on stone tile/HP2500: avg. 50~55 dB
sound received at downstairs
time / second

2. Flexibility and Changeability

SI (Skeleton Infill) Building implementation efficient and quite renovation /  low renovation, maintenance costs

SI (Skeleton Infill) Building concept has been introducing in Japan for more than a decade. There are more and more SI buildings in Tokyo metropolitan since beginning of 2000s.  

The SI buildings consists of following fundamental approaches:

1. Changeability – walls in-between rooms are changeable
   Living room, bedroom, kitchen, toilet, bathroom, can be changeable. The changeability shall meet occupants’ or new occupants’ requirements at different stage of occupancy.
2. Capability for easy maintenance and relocation: utility pipes and electricity wires are distributed underneath HP2500, not embed in the building structure or walls. This enables future maintenance and relocation fast, easy, low costs, and proceed under minimum noise to neighbors.
3. Reasonable deployment of all utility pipes: Utility pipes (water, sewage, toilet) from the common usage, shall be distributed only inside the occupant’s premise, passing through neither upper floor nor lower floor. By mean of this, minimum interference during repairing may be occurred when there is leakage, maintenance, or re-location of the pipes.

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