Noisy is the level or volume of the sound (in decibel) transmitted from the sound source.
The maximum noisy accepted to be suitable with the sound conditions in the room
What is noisy?
Noisy is the level or volume of the sound (in decibel) transmitted from the sound source. The maximum noisy accepted to be suitable with the sound conditions in the room.
Acoustic in building
It is the scientific section that researches how to control noisy. It includes two ways: how to limit noisy get minimum in transmission place to place. That one, the noisy level is controlled in the determined time. It is divided in to two: the sound insulation and reduction:
* The sound reduction (died sound) is the acoustic absorption of material. It is descripted in NRC index and determined by calculating average value of the acoustic energy that is absorbed by material in frequency band.
* The acoustic absorption of material is applied for installing interior buildings. It will become better if it is a hole-shape.
Using methods for preventing from sound wave transmitting. If STC sound index is more high it will be better at insulating sound.
* Reducing sound ceiling The sound go through wall and partitition easily so it is necessary to note the wall and partitition thickness and need to seal slots between wall and partitition and ceiling.
* Sound insulating material is recommended to install ceiling, wall and partition such as gypsum board. The thickness of wall and partitition and width of frame produce the desired effect.
Sound insulation in installing interior buildings
It is very necessary to separate in to physics in maximum.
There are two ways to design for the sound insulation: The wall is made from frame system and making grooves or hole on the surface of wall.
After frame system finishing, installing gypsum board to cover frame system and put the raft of fibre glass inside of the wall space at the same time to make finished wall (called partition) and insulate sound better (reduce the sound up to 50decibel) .
Besides we can install the hole-shape materials such as GH gypsum board (very popular, cheap and effective) for reducing the sound from inner.
There are two reasons cause for the damp phenomenon:
First, wet atmosphere goes in to the main land from the sea matching the available cold atmosphere.
-The second, Southern and westernly wind increase at 1000 - 1500m height so it cover atmosphere.
The damp weather cause for diseases: articulation disease, cardiovascular, asthma, cough, headache and others due to discharge badly so we feel tired, headache and uncomfortable.