ᐅ Drywall cavities without insulation? What is the sound insulation value?
Created on: 30 Nov 2017 14:00
U
Umbau17
Hello,
we plan to install new drywall partitions. All will be between heated rooms, drywall sheets on metal studs. For weight and cost reasons, we would prefer to skip insulation material between the drywall sheets. However, we want to double-layer the wall with 12.5 mm (1/2 inch) boards. Does anyone have experience with this kind of construction without insulation? Does anyone perhaps even know the respective sound insulation values (double-layered 12.5 mm drywall without insulation versus with insulation)?
Sound transmission depends on many factors. We assume proper installation and mounting of the walls. But one question for us is: Doesn’t sound mostly travel through, for example, the doors (if they are not specially insulated), while the wall itself has good insulation but the sound finds its way through the door?
Experience-based or theoretical values would be really helpful.
Thanks in advance and best regards
we plan to install new drywall partitions. All will be between heated rooms, drywall sheets on metal studs. For weight and cost reasons, we would prefer to skip insulation material between the drywall sheets. However, we want to double-layer the wall with 12.5 mm (1/2 inch) boards. Does anyone have experience with this kind of construction without insulation? Does anyone perhaps even know the respective sound insulation values (double-layered 12.5 mm drywall without insulation versus with insulation)?
Sound transmission depends on many factors. We assume proper installation and mounting of the walls. But one question for us is: Doesn’t sound mostly travel through, for example, the doors (if they are not specially insulated), while the wall itself has good insulation but the sound finds its way through the door?
Experience-based or theoretical values would be really helpful.
Thanks in advance and best regards
Umbau17 schrieb:
Between two panes of glass in the window, there is no insulation material. Their rigidity cannot be compared to drywall either.
Umbau17 schrieb:
Maybe someone else has (another) idea about this? I mentioned this at the beginning, where you can find clarification on the physical relationships.
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
Hello 11ant, you’re right — drywall naturally vibrates much more than window glass. And your tip about the cross brace is a good one. Comparing the wall to a box, in my opinion, is a bit extreme — after all, boxes and speakers usually have specific openings in their hollow bodies with membranes that vibrate and transmit the vibrations to the air. And we don’t want to drill holes in the wall. But I think this already gets me to the main point: the drywall and building components must not be able to vibrate, and there must be no air connections that allow sound vibrations to pass from one room to another. It’s a pity it’s so complicated to test it out first.
Umbau17 schrieb:
Equating the wall with a speaker box is, in my opinion, a bit extreme I didn’t do that either. If you google bass reflex speakers, you’ll find detailed explanations of the effect of the “wadding,” and with compound speaker systems, you are dealing with two membranes positioned one behind the other—similar to the layers of drywall on a stud wall. Whether you want to produce or dampen sound, the underlying principles are similar. And since you want your walls to behave as differently from speakers as possible, the goal is to prevent them from transmitting vibrations. Although there are no coils on gypsum boards, they still act as membranes. The proposed braces help to stiffen the structure against localized vibrations.
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
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Newcomer19853 Dec 2017 22:37Umbau17 schrieb:
Hello,
we want to install new drywall partition walls. All between heated rooms, gypsum board on metal studs. For weight and cost reasons, we would prefer to skip insulation material between the gypsum boards. However, we do plan to double-layer the wall with 12.5 mm (0.5 inch) boards. Does anyone have experience with this type of construction without insulation? Does anyone possibly know the sound insulation values for this (gypsum board 12.5 mm (0.5 inch) double-layered, without insulation versus with insulation)?
Sound transmission depends on many factors. We assume proper installation and construction of the walls. But the question for us is: doesn’t the sound mostly travel through, for example, the doors (if they are not specially insulated), so you have a wall with good insulation material but the sound finds its way through the door?
Experience-based or theoretical values would be really helpful.
Thanks in advance and best regards Good evening, I have been working in a drywall company for nearly 10 years. I don’t quite understand why you want to leave out the insulation. How many square meters of wall are we talking about? With a price reduction of about 3-4 €/m² (at least here in AUT), I think the savings are negligible compared to the expected decrease in sound insulation performance.
Just buy 50 mm (2 inch) mineral wool insulation like Knauf Insulation TI140W or similar, stuff it in, and you’re done.
Best regards
Umbau17 schrieb:
Hello,
we want to install new drywall partitions. All of them are between heated rooms, gypsum board on metal studs. For weight and cost reasons, we would prefer to skip insulation between the gypsum boards. However, we do plan to double-layer the drywall with 12.5 mm (0.5 inch) boards. Does anyone have experience with this construction method without insulation? Does anyone possibly know the soundproofing values (gypsum board 12.5 mm (0.5 inch) double-layered, without insulation versus with insulation)?
Sound transmission depends on many factors, of course. We assume proper workmanship and installation of the walls. But the question for us is, for example: Doesn’t sound mostly transmit through doors (if they are not specially insulated), so even if you have a wall with great insulation material, the sound will find its way through the door?
Experience-based or theoretical values would be really helpful.
Thanks in advance and best regards I am asking myself exactly the same question. In our case, we have about 300 m² (3,229 ft²) of wall area that is not sound-sensitive (for example between storage room / living room or hallway / laundry room or attic rooms). I am considering using insulation only where it seems necessary (bedroom / hallway or bedroom / bathroom). Did you ultimately build without cavity insulation, and if so, what was your experience?
Best regards, Fabian
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