John Sayers' Recording Studio Design Forum Archive

Hi,

I´m using the great calculator made by Gregwor. Just wan´t to get a second look on it... Do you think this:

15 cm thick Brickwall (I don´t know the density since this is an existing wall, but used the one I found for the red facing brick since the brick is red )
15 cm air gap between inner leafs
2X6 wood stud (filled with insulation)
3 5/8 drywall (10.74kg/m2 each plate)

for the density I divided the weight of a plate by the total area of one drywall

Is correctly represented by what I did on the calculator?

If anyone wanted to see my results, here they are:

Hi memocn59,

It's preferred by the moderators of the forum that you keep your design in one thread. That way, when people are referencing your build, it's all in one spot rather than littered all over the place. It also keeps each forum section clutter-free. The search feature allows users to easily find things related to one another. For example, if someone typed in CALCULATOR it would for sure bring up this thread as well as your other thread on the same topic and any other instances. Therefore, it is no use to have a new thread for each question that people have. Just keep all of your questions to your main design thread. Also, it would be great to know your real name

Is correctly represented by what I did on the calculator?

3 5/8 drywall (10.74kg/m2 each plate)

for the density I divided the weight of a plate by the total area of one drywall

So, how I did it, and how I believe you should have done it is like this: So, if you know the exact surface density of your drywall, you choose custom kg/m2 for your sheathing and enter them like I did. In your case you indicated that each sheet of drywall is 10.74 kg/m2.

Then, for some reason for your leaf 2 sheathing you put in an additional surface density which was added to your leaf 2 brick support structure material. So, leave that blank instead.

You cut off what value you entered for the brick's thickness. The calculator needs that in order to figure out what the surface density will be. You wrote that you want it to be 15 cm thick of brick so as you can see in my image, that's what I entered.

Now, due to the extreme surface density of brick and 3 layers of drywall the calculator shows crazy high numbers. And truth be told, in a perfect world it would perform this well. However, unless the floor is totally isolated as well, there will be structure borne vibration that will trash those isolation figures. Either way, if you build your studio with these materials, you'll get really great results. Just remember to seal your brick!

I hope this answers your question! Glad you're enjoying the calculator!

Greg

Gregwor wrote:It's preferred by the moderators of the forum that you keep your design in one thread. That way, when people are referencing your build, it's all in one spot rather than littered all over the place. It also keeps each forum section clutter-free. The search feature allows users to easily find things related to one another. For example, if someone typed in CALCULATOR it would for sure bring up this thread as well as your other thread on the same topic and any other instances. Therefore, it is no use to have a new thread for each question that people have. Just keep all of your questions to your main design thread. Also, it would be great to know your real name

I understand, sorry

I have a question, since I´m from Mexico, some of the words are difficult for me to identify... One of these words is the actual brick my wall uses... I will attach a picture of the block... Could people refer to this brick? Which is the correct term... I mean, I need this in order to use the correct density =)

Thanks

I understand, sorry

No problem bud!

Could people refer to this brick? Which is the correct term... I mean, I need this in order to use the correct density =)

This material is more common in the Eastern part of my country so I'm personally not very familiar with it. I'd assume, like you did, that this is red brick. Hopefully someone more familiar with brick can chime in with a definitive answer!

Greg

Could people refer to this brick? Which is the correct term... I mean, I need this in order to use the correct density =)

That is brick, yes. And you certainly can use that to get good isolation! The density of that brick is around 2300 kg/m3. Not too different from concrete or cement. They are all in the same range. After you build your wall, you do need to seal ("sellar") the surface of the wall with a good sealant. Brick, mortar, cement, concrete, and similar surfaces are porous, which isn't good for acoustic isolation, so you need to seal it with something that blocks up the surface pores. Masonry sealant is the best, but you can also even use inexpensive paint if you can't find proper masonry sealant. Where I live, it is common to use "sellante de cal" right on the surface, then put on second layer of ordinary latex paint (or "esmalate al agua" if you can get that). Do this on the surface facing the wall cavity, at least, but sealing both sides is better.

- Stuart -