WEBVTT

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Hello, I'm Alex Brown, and I'd like to introduce you to the Floor

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STC/IIC Acoustic Analysis design tool.

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This tool helps architects and engineers quickly determine the sound performance of

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their floor assemblies with varying flooring and ceiling treatments to

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calculate an expected sound transmission class and impact insulation

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class. Let's jump in. So this tool was built to quickly verify

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that the selected deck and the slab that are probably pre-selected for

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structural purposes will work with the selected flooring

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and ceiling options and give you that acoustic performance you're looking for.

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So starting at the top, working our way down,

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job name and description can be inputted up here.

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These will be incorporated into the file name of the PDF that you can download,

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so it can be helpful to organize different areas or different projects

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if you're using this tool repeatedly.

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And then starting at the top here for flooring, this is going to include

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luxury vinyl tile, carpet, hardwood.

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The different options that we tested are all here.

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These are the different Vulcraft and Verco deck types that are available across the

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country. If you're not immediately sure which one would apply to

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your area, we've got a map here just showing kind of that breakdown.

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Vulcraft has sort of everything east of the Rockies, Verco everything

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west.

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And then the ceiling,

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again, kind of like with the flooring, we've got different options here depending

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on what that build-out is going to be for your tenant.

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And then as you make changes, these values over here for the STC and

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IIC will update immediately. So you can see kind of a quick

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example here. The graphic also updates,

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so that's going to incorporate every layer of this from the

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deck to the flooring to the ceiling.

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We've got graphics just to kind of quickly confirm that you're getting what you

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think you're getting, and then those performances update over here.

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And then at the very bottom of the tool, we've created this generic rating scale

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just to identify what the different ranges of STC or IIC

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values are and kind of their real-world description that

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would describe how that performance is.

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And then again, this print button here will take everything that's inputted and

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shown on the screen and put it into a downloadable PDF that will

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summarize everything as well as describe some of our methodology.

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So we'll look at that in just a little bit.

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But first, I want to start by trying to find the worst-performing floor

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assembly possible. So if there was nothing as far as flooring,

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it's just bare concrete on top.

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And we can use the thinnest slab possible.

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So we'll do an inch-and-a-half composite deck here,

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lightweight concrete with the minimum amount of concrete cover.

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So you can see my numbers over here updating accordingly,

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and then no ceiling whatsoever.

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So with that, my STC is 46 and my IIC is 17.

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So the 46 isn't horrible. 50 is generally code

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minimum. But that IIC of 17 is absolutely terrible.

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You would hear everybody walking above you. So let's improve on that.

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We can throw some flooring in,

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so just some hospitality carpet. And that already has improved our

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IIC quite a bit.

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STC stayed the same.

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So let's put a hung ceiling in there.

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So just a dropped gypsum board ceiling.

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And with that, my values are much better now.

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So 53 and 56 respectively, both getting over that 50 hump.

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And let's say I was completely happy with this design, wanted to

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proceed. I would hit this print button here.

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And that downloads a file with job one, area one, just

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pulling from the top text bars here.

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And if I open that up, you can see it summarizes all of my inputs

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and then my output, STC of 53, IIC of 56,

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hospitality carpet, that deck slab, the hung ceiling.

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And then what's really interesting, we've actually predicted the performance of

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different frequencies within this assembly.

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So you can see that graphed here and in chart form.

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So this is for the STC performance, and then this is for the IIC

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performance.

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And then there's a little bit of language here as well just describing how this

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tool works. Because we didn't test every single

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possible assembly. There would be thousands of them.

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What we did was calculated expected performance with an

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engineering analysis based on 108 tests spanning the full range

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of input parameters. This model has been shown to predict STC and

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IIC ratings with an average difference close to zero and a standard

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deviation of less than two for STC or three for

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IIC.

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And further engineering and analysis can be accessed here.

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So this comes from our outside sound consultant.

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They wrote this really good report summarizing our methodology, how

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the research was done, and then how the tool was built.

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And I'd really like to point to the section 2.2 here

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because this really speaks to why the tool even exists in the first place.

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"International Building Code provides two ways to demonstrate a building's assembly

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meets the requirements. The first is to simply test the assembly."

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That's great. "The second way is to establish the STC and IIC rating

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by engineering analysis based on a comparison of data of walls and floor-ceiling

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assemblies. The tool described in this study is limited to concrete and

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metal deck composite slabs, but even for this limited subset of assemblies, there

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is a wide range of possible assemblies.

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So the type of deck, type of concrete, thickness of concrete, finished floor,

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ceiling conditions can all vary, and the total number of permutations is in the

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thousands, which is clearly impractical.

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An engineering analysis is required to establish these ratings in a way that's

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consistent, realistic, and defensible."

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So that's sort of the philosophy behind this tool.

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If you wanted to go deeper and see the actual test data for those 108 tests

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done, contact your local district office, and they'd be able to

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point you in the right direction on that.

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And that's the Floor STC/IIC Acoustic Analysis tool.

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It's a powerful tool to quickly analyze different combinations of flooring,

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structural deck slabs, and ceiling options and dial in your next project's

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acoustic performance. And with that, happy specifying.