Archive for February, 2019

Airborne & Impact Sound Testing in London

Sound Testing usually needs to be carried out between pairs of rooms separated by party walls and/or floors. Most sound tests are carried out between living rooms and bedrooms as these are classed as the two main habitable rooms; however, other rooms can be used if this is not possible such as studies, kitchens and dining rooms.

Our Sound insulation testing procedure is fairly simple and straightforward. Essentially, for party walls there is only one type of sound insulation test which is airborne sound test; however for party floors there is a requirement for two types of sound insulation testing – airborne & impact sound testing. Here is a brief description for each type:

Airborne Sound Testing in London

Airborne Sound Testing is carried out by means of a loudspeaker emitting a steady source of noise on one side of the partition (wall or floor) to be measured. The corresponding sound level is measured on the other side of the partition. Impact sound insulation tests are carried out by means of a tapping machine placed on the floor sample to be measured and the noise measured in the room or space below. Calculations are done based on these measurement and the above mentioned parameters are calculated and compared to the Building Regulations Part E sound insulation requirements for the given type of the building. It is important that the building to be sound tested is completely finished and sealed with no sound leakage through doors and windows.  Please see our check list for sound testing for more information.

Airborne sound insulation testing is undertaken to walls & floors. Firstly a controlled noise is generated by an amplifier and loudspeaker across a broad range of frequencies. The generated noise is very loud and is often in excess of 100dB. Initial measurements are taken using a class 1 sound level meter within the ‘source room’ followed by further measurements in the ‘receiver room’ on the other side of the wall or floor under investigation. The source room speaker position is then changed and the measurements repeated either side of the partition under test. Thereafter background noise measurements are made using a class 1 sound level meter in the receiving room and are used to apply appropriate corrections for external sound such as traffic noise. Similarly the reverberation time (the time taken for sound to decay by 60dB) is measured within the receiving room using the sound source and a sound level meter to determine the corrections that must be applied to account for the characteristics and absorptiveness of the room. The difference in the two airborne noise levels (for walls and floors), corrected for background and reverberation characteristics determines the airborne sound insulation performance of the wall, or floor. A greater airborne noise difference between the source room and the receiver room determines a higher airborne sound insulation performance.

The time taken to undertake sound testing varies from project to project as no site is exactly the same. Taking into account standard site conditions a set of tests on houses -two airborne walls will take one to two hours. A six pack of tests on flats – 2 airborne wall tests will usually take between one and two hours, although this is dependent on our engineers having full free uninterrupted access between all the units/rooms under investigation.

Impact Sound Testing in London

Impact sound testing is undertaken to floors only. This test is different; a calibrated Norsonic ‘tapping machine’ which comprises of five ‘hammers’ driven up and down by a cam and electric motor is used to “tap” the floor surface by applying a known force on the floor structure. The machine is placed in several pre-determined positions. The resulting noise is measured in the dwelling below, using a sound level meter. Thereafter, background noise measurements are made using a class 1 sound level meter in the receiving room and are used to apply appropriate corrections for external sound such as traffic noise. Similarly the reverberation time (the time taken for sound to decay by 60dB) is measured within the receiving room using the sound source and a sound level meter to determine the corrections that must be applied to allow for the characteristics and absorptiveness of the room.

The time undertaken to test each project varies from project to project as no building/development is exactly the same. Taking into account standard site conditions a set of tests on houses which consists of two airborne walls will take approx. 1-2 hours. A six pack of tests on flats consisting of 2 airborne wall, 2 airborne floor and 2 impact floor tests will usually take approx. 2-3 hours, although this is dependent on our engineers having full free uninterrupted access between all the units/rooms under investigation.

If you require sound testing, and/or acoustic design advice then please contact us now at info@aptsoundtesting.co.uk or phone Darren) direct on 07775623464. You can also visit our blog at: http://aptsoundtesting.co.uk/blog/  or visit our website at www.aptsoundtesting.co.uk

Air conditioning is an increasingly common item in the entire house globally

A few years back it was considered an expensive equipment and extreme luxury. But, now its price has become popular due to the development of new technologies. In addition to good equipment, a good installation is very important for the proper functioning of the entire system. Air conditioning equipment can regulate the temperature, humidity and ventilation of the environment. In order to know more about the Air conditioning installation Geelong, you can always seek help online. Before continuing, it is interesting to clarify what is and how is the operation of split equipment. Split air conditioners are the most popular, have good technology and the price is affordable. They are composed of two parts.

  • Evaporator that is internal to the house and is responsible for the distribution of air treated in the environment
  • Condenser that is external to the house, it is through this equipment that the air of the environment is renewed.

Definition of air conditioning capacity

The first step is to ensure that your air conditioning is suitable for the environment where it will be installed. Capacity is a function of the size of the environment and the incidence of the sun at this location, whether it is morning sun or afternoon sun.

Electrical Installation  

Tips for installing air conditioning It is important to note what voltage the equipment needs to operate and what voltage is available in your home. If the power supply is horny that the equipment needs, 127 or 220v, that’s fine.

Location of the evaporator  

The installation of the evaporator (internal equipment) must be chosen with care. It is indicated that the airflow is parallel to the largest dimension of the environment. In addition, you should avoid installing the evaporator away from heat sources and electronic equipment, because of the risk of drainage failure and start dripping water on the equipment. Of course you should also not install the equipment behind furniture, curtains or near any object that prevents the airflow.

Condenser installation location  

To install the condenser (external equipment), you must take into account the position of the evaporator, in order to rationalize the use and pipes. Another tip is to place the condenser in place with the lowest incidence of sun possible. Place in a well ventilated place and avoid alleys, corridors and garages.

Water drainage  

Water drainage is another essential care. The drainage process is by gravity, so you should avoid the following problems

Curve near drainage outlet

If it is not possible to eliminate water by gravity, it is interesting to install a small pump. Failures in the drainage system may lead to gutters in the interior of the room and infiltration into the walls where piping is present.

Materials needed  

In addition to all the tools required for any type of installation, you will need materials that are specific for this purpose. Refrigeration Tubing they are pipes in copper or aluminum, with gauges and thicknesses according to the capacity of your equipment. Electrical Installation Piping This tubing is sized according to the capacity of the equipment and wiring required.