ᐅ Are filled or hollow bricks more effective for interior sound insulation?

Created on: 25 May 2022 22:30

Hello everyone,

We are planning to build a single-family house using hollow bricks with a thickness of 36.5 cm (14.4 inches) (Thermoplan S8). They provide good thermal insulation but are probably less effective for soundproofing compared to similar solid bricks. We live in a rural area on a side street, so external noise is not a major concern.

For the interior walls on the upper floor (bedrooms and children’s rooms), we plan to use bricks with a higher bulk density class (1.2) because sound insulation inside the house is important to us.

However, I keep reading that the exterior wall bricks also affect soundproofing within the house (sound transmission through the exterior walls into the other floor). Is that really the case? I haven’t found any information about this on the manufacturers’ websites.

Does anyone have knowledge or experience regarding this?

I would appreciate any feedback!

HoisleBauer2227 May 2022 14:12

#19

Smarti99 schrieb:

Cheaper and similar settlement as well as shrinkage behavior.

I don't understand that now. If the brick is narrower, then there is simply less air inside, right? Or am I misunderstanding the bulk density?

Smarti9927 May 2022 21:52

#20

The higher the density, the better the sound insulation per centimeter (inch) of wall thickness.

An increase of 10 dB in attenuation corresponds to halving the amount of sound. The scale is logarithmic, not linear.

HoisleBauer2227 May 2022 23:29

#21

Smarti99 schrieb:

The higher the density, the better the sound insulation per centimeter of wall thickness.

Sure, but if I multiply 11.5cm (4.5 inches) wall thickness by a density value of 1.4, I get "16.1" (crazy calculation, I know...).
If I take 17.5cm (7 inches) times a density value of 0.8, I get "14" — so would that mean the thinner wall provides better sound insulation?
Does anyone know the correct way to calculate this?

HoisleBauer2228 May 2022 01:02

#22

Further insights from the technical datasheets: A significant improvement can be achieved by increasing the bulk density—I had not previously realized that in the brick designation, the bulk density is indicated immediately after the thickness and that bricks with different bulk densities can be purchased with the same thickness:

Poroton perforated brick Plan-T 11.5cm (4.5 inches)-0.8 -> 41.6 dB
Poroton perforated brick Plan-T 11.5cm (4.5 inches)-1.2 -> 45.6 dB
Poroton perforated brick Plan-T 11.5cm (4.5 inches)-1.4 -> 47.5 dB

Poroton perforated brick Plan-T 17.5cm (7 inches)-0.8 -> 46 dB
Poroton perforated brick Plan-T 17.5cm (7 inches)-1.4 EB -> 52.3 dB [EB probably stands for earthquake, indicating suitability for all seismic zones.]
Poroton perforated brick Plan-T 24.0cm (9.5 inches)-0.8 -> 49.6 dB
Poroton perforated brick Plan-T 24.0cm (9.5 inches)-1.4 EB -> 56.1 dB

Conclusion: A value of 0.6 in the bulk density class multiplied by 10 roughly corresponds to the increase in dB value (=6), meaning it is almost proportional.

Smarti9928 May 2022 08:22

#23

Soundproofing aerated concrete has 63 dB at a 24 cm (9.5 inches) raw density 2, which is nearly twice the attenuation of the best brick.

HoisleBauer2228 May 2022 10:29

#24

That’s interesting. Could you explain a bit more precisely what it is and which manufacturers offer it? A Google search doesn’t yield any useful results... What is the cost per block? What are the U-values?

ᐅ Are filled or hollow bricks more effective for interior sound insulation?

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