# Floor Concrete (sound barrier)

**URL:** <https://forum.nachi.org/t/floor-concrete-sound-barrier/24631>\
**Category:** Structural Inspections\
**Created:** [February 3, 2008, 1:57am UTC](https://forum.nachi.org/t/floor-concrete-sound-barrier/24631 "2008-02-03T01:57:11Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![kgoff](https://avatars.discourse-cdn.com/v4/letter/k/439d5e/32.png) [@kgoff](https://forum.nachi.org/u/kgoff)\
**Post date:** [February 3, 2008, 1:57am UTC](https://forum.nachi.org/t/floor-concrete-sound-barrier/24631/1 "2008-02-03T01:57:11Z")

</div>

I inspected a condo where the builder claims concrete was installed on the floor between the upper and lower units for sound. I verified that there is a hard substance but it doesn’t look like traditional concrete. It’s smooth and grey in color, similar to the prducts used to fill cracks in concrete.

Doe anyone know what this product is called?

---

<div class="post-metadata">

**Author:** ![jbudrow](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/jbudrow/32/258_2.png) [@jbudrow](https://forum.nachi.org/u/jbudrow)\
**Post date:** [February 3, 2008, 2:57am UTC](https://forum.nachi.org/t/floor-concrete-sound-barrier/24631/2 "2008-02-03T02:57:25Z")

</div>

**I think it’s called Gypcreet**

---

<div class="post-metadata">

**Author:** ![Brian\_A.MacNeish](https://avatars.discourse-cdn.com/v4/letter/b/90db22/32.png) [@Brian\_A.MacNeish](https://forum.nachi.org/u/Brian_A.MacNeish)\
**Post date:** [February 3, 2008, 3:15am UTC](https://forum.nachi.org/t/floor-concrete-sound-barrier/24631/3 "2008-02-03T03:15:57Z")

</div>

> [@jbudrow](#):
>
> **I think it’s called Gypcreet**

Gypcrete is a lightweight concrete that is applied as a slurry by hose.(therefore is self-leveling) In some cases, it’s used to cover radiant floor piping to provide a base for the finish flooring and as well to spread the heat out due to conduction

---

<div class="post-metadata">

**Author:** ![gbeaumont](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/gbeaumont/32/1094_2.png) [@gbeaumont](https://forum.nachi.org/u/gbeaumont)\
**Post date:** [February 3, 2008, 3:16am UTC](https://forum.nachi.org/t/floor-concrete-sound-barrier/24631/4 "2008-02-03T03:16:27Z")

</div>

Hi Kevin,

James is on the right track, gypcrete is actually a brand name that has become somewhat generic, the question here is what is the structure of the building? if it is poured in place concrete then you are probably looking at a leveling finish, if however the structure is steel or timber framed then it is more likely a lightweight concrete product.

Here’s a good link for [lightweight concretes](http://www.greenhomebuilding.com/pumicecrete.htm#LWC)

Regards

Gerry

---

<div class="post-metadata">

**Author:** ![kgoff](https://avatars.discourse-cdn.com/v4/letter/k/439d5e/32.png) [@kgoff](https://forum.nachi.org/u/kgoff)\
**Post date:** [February 3, 2008, 9:30pm UTC](https://forum.nachi.org/t/floor-concrete-sound-barrier/24631/5 "2008-02-03T21:30:23Z")

</div>

Thank you for the information.

Kevin Goff