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!

11ant26 May 2022 13:53

uk240820 schrieb:

Don’t these statements contradict each other? Maybe I should ask my question differently:
I understand that structure-borne sound can be transmitted through the exterior walls to the floor above or below. However, our architect, structural engineer, and contractor all say this isn’t a problem if the screed installer does a proper job with the screed on the upper floor. They say you basically need to make them aware to pay attention to certain details (sorry, I can’t remember the exact measures right now). Are they all wrong about this claim?
One more detail: we are planning a 26cm (10 inch) thick reinforced concrete slab between the ground floor and upper floor.

Whoever wants to rely on such massive slabs: once the sound gets into the wall, the hollow bricks act like resonance bodies (like pan flutes). Sound transmission inside a building depends less on the choice of building material and more on the mechanical decoupling. This is where “floating” screed and perimeter insulation strips come into play: even small sound bridges are unfortunately very effective. Maybe this reading tip helps you as well: https://www.hausbau-forum.de/threads/innenwaende-porenbeton-kalksandstein-oder-leichtbauwaende.25259/

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Smarti9926 May 2022 15:32

We have bricks with soundproof pumice as interior walls with a raw density class of 2.0. We hardly hear anything.
Next time, however, I would choose sand-lime bricks.

11ant26 May 2022 17:17

Smarti99 schrieb:

We have bricks with soundproofing pumice as interior walls with a raw density class of 2.0. We barely hear anything.
Next time, though, I would choose calcium-silicate blocks.

And why choose differently next time if the result is already very good?

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Nida35a26 May 2022 23:41

#10

11ant schrieb:

And why do it differently next time if the result is already very good?

You always jump to the worst-case scenario,
@te if you’re concerned about sound insulation, focus on that—
hollow bricks are not a permanent solution.

HoisleBauer2227 May 2022 00:18

#11

A question: We are planning to use unfilled 24 cm (9.5 inches) hollow bricks for load-bearing walls (11.5 cm (4.5 inches) for non-load-bearing walls). What can be expected regarding sound insulation? Would filling the bricks make a significant difference? If yes, would perlite or mineral wool be better?

11ant27 May 2022 00:42

#12

I don’t understand:

Nida35a schrieb:

You always go straight to the worst case,

What’s wrong if the current solution works well?;

Nida35a schrieb:

unfilled blocks are not your permanent solution

But the blocks will remain unfilled forever, there is no blown-in insulation for individual hollow cavity blocks (???)

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https://www.linkedin.com/company/bauen-jetzt/

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

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