Are you using the dot and dab technique in your soundproofing solution? Stop!
We’re going to explain how the noise is channelled down the cavities created by the technique and why you should avoid it. After removing a section, we found the 15mm dense sound block plasterboard which was causing the noise, made worse by the dot and dab technique!
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The use of plasterboard fixed with dollops of plasterboard adhesive has been proven by the National House Building Council (NHBC) to increase noise (on average) by up to 10dB, a doubling in sound intensity as we hear it.
‘Dot and dab’ involves fixing plasterboard directly to an area that needs plastering or making good. The plasterboards are cut to size, positioned and, when ready, stuck to the wall using strategically placed dol- lops of drywall adhesive to the surface to be treated. The boards are then levelled, creating a smooth surface ready for plastering. This method is now fre- quently used in new-build properties as it is very easy to carry out; most builders use this technique on ren- ovation or extension projects. The ability to directly attach plasterboard to masonry gives a considerable speed advantage over traditional methods.
Dot and dab involves mixing up a bag of plasterboard adhesive with a mixing paddle, so is also quite messy. However, a whole room could be ‘dot and dabbed’ in a day by builders, carpenters or any competent do-it-yourselfer, and a small room could have finish- ing plaster applied the same day. The speed at which a room, or even a whole house, can be made ready for finishing plaster has revolutionised the building industry. The cost is low, it is a much faster way of preparing a brick or block wall and the faster drying time means walls can be painted much sooner.
The problem with ‘dot and dab’ techniques is that, although you are putting an extra layer on the wall, you are amplifying the noise from your neighbours. A cavity is formed between the dots of adhesive, which creates a drum effect. A site investigation by NHBC acousticians revealed that removing ‘dot and dab’ adhesive and exposing the blockwork behind, improved the sound insulation of the party wall and separating floor. The single-figure performance improvement was 3dB; however, at the frequencies where the human ear is most sensitive (1,000hz to 5,000hz) sound insulation improved by nearly 10dB
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Want to know more information about this? Visit our blog post outlining all the issues that come with using the dot and dab technique: www.quietco.uk/blog/the-use-of-dot-and-dab-plasterboard-in-homes
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Disclaimer: Videos produced by Quietco are provided for informational purposes only. All material provided within this website is for informational, educational, & entertainment purposes only. Some of these projects, materials, and techniques may not be appropriate for all ages or skill levels.
Quietco will not take responsibility of what you do with the information provided by this site.
Viewers must be aware that by carrying out out the concepts and ideas outlined on these videos on their own projects, that they are doing it at their own risk and Quietco cannot be held liable if they cause any damage to theirs or others homes. With different building regulations around the world and constantly changing construction standards, regulations and rules, it is the sole responsibility of the viewer to educate themselves on their local building regulations before undertaking these concepts Contact your local building control officer if you are unsure
