Regulations governing the transmission of sound between dwellings is a relatively modern creation. Many older buildings were created without any consideration being given to the issue of noisy neighbours. Furthermore, the levels of external noise around these buildings has increased significantly in recent decades, with buses and lorries, for example, often passing close to many properties.
When a property is refurbished or converted, it will generally become necessary for it to meet the necessary regulations. These regulation donâ€™t exist simply as a demand of Building Control but reflect the level of peopleâ€™s expectations regarding acoustics and soundproofing in the 21st Century.
The Karma range of soundproofing products has been created to ensure both regulations and expectations can be achieved.
Where ever possible, stagger the joints if double layering of plasterboard is required.
Ensure boarding goes all the way down to the floor and all the way up to the top even if skirting or a cornice covers it. And, for optimum performance use sealant on the joints.
Light or plug sockets should not be placed back to back otherwise the sound will go straight through the structure. Around the sockets, to maintain integrity, use intumescent putty seal which swells as a result of heat exposure, thus increasing in volume, and decreasing in density. Intumescents are typically used in passive fire protection.
Pay particular attention to the end detail of wall and floor junctions.
Attention to detail is absolutely essential, to ensure that a soundproof structure is performing to its maximum level great care must be taken in its construction.
It must be built as if it needed to be waterproofed - as sound, like water, light or air - will find the smallest crack and expose it as a weak part in the structure.
Any gap or hole will significantly impair the constructionâ€™s performance. A single 25mm hole in an otherwise acoustically sound partition can reduce performance by up to a massive 15 dB.
Although a 25mm hole should be visible a crack 1mm x 1m will not always be obvious, and if this is not treated correctly with an acoustic sealant it will be detrimental to the structure.
Please remember that an acoustic construction is only as good as its weakest link.
This patented technology (Patent number: epc (UK) 1173503) results in a 1.2mm thick product based on synthetic rubber and is supplied in rolls of various sizes.