Prepping the basement for drywall

[Velvet Elvis]

Those math calculations make me want to vomit

I'll be patient, Rick.. thanks for your work!!

Jim

 

[RICK FITZPATRICK]

Hey Jim, what is the thickness of the OBS you are going to use?

 

[Velvet Elvis]

Rick,

I was planning on using 3/4 inch OSB and/or plywood. I have a whole pile of it in my garage from my father in law's scrap pile.

The spacing between floor joists is 16 inches.

Jim

 

[RICK FITZPATRICK]

oK, GOOD. One more thing. I need a dimension between the centerlines of the two joist cavities that contain the 2 ducts. In other words, from centerline of one cavity to the other. 16" o.c. don't always work out. I need reality. Oh, and measure it at where the baffle is going. Things aren't always plumb, square, level etc. Except when I build things.
fitZ

 

[Rod Gervais]

Rick,

that isn't anything you want to use with this - all of this is based first on a decrease in velocity - and the baffles are next - the absorbing interior is minor - and we definately don't want to get involved in tuning tubes for these purposes.

Rod

 

[Velvet Elvis]

Rick,

that isn't anything you want to use with this - all of this is based first on a decrease in velocity - and the baffles are next - the absorbing interior is minor - and we definately don't want to get involved in tuning tubes for these purposes.

Rod

So is this saying that any old baffle that allows the air velocity to decrease (by increasing volume) and contains some 90 degree bends in it will do the trick?

Jim

 

[RICK FITZPATRICK]

that isn't anything you want to use with this

You're the expert.Ok, sounds good to me.

So is this saying that any old baffle that allows the air velocity to decrease (by increasing volume) and contains some 90 degree bends in it will do the trick?

That reminds me what diameter is your flex ducting?

 

[Velvet Elvis]

That reminds me what diameter is your flex ducting?

6 inch

I checked a few of the areas that I'd be putting the baffles in. They are indeed purdy dern near 16 inches OC.

Jim

 

[RICK FITZPATRICK]

Jim, I STILL need the dimension from the centerlines of the two joist cavities with the supply and return ducts. I can't tell from the pictures. 16" oc doesn't tell me anything. In fact, if you can also give me a dimension from the exterior wall parallel to the joists, to the centerline of the closest joist cavity with the flex duct, I'd 'preciate it.

 

[Velvet Elvis]

Rick,

The cavities are 16 inches wide (from center of joist to center of joist). Its a new house (relatively), so I double checked them and that's what they are... unless I'm misunderstanding your measurement.

Also... I'm not sure I understand the second measurement you want. Can you explain it in words that a moron like me can understand?

Jim

 

[RICK FITZPATRICK]

Maybe this will help. Thanks Jim.

 

[Velvet Elvis]

The distance from the wall to the feed is 43 1/2 inches... however, the exhaust might have to come out of the side wall (it could still enter into the soffit design, but it would be from the side instead of the top). The side was would be 62 inches away.

Jim

 

[RICK FITZPATRICK]

Hello Jim. Thanks for the info. However, SOMETHING ain't jiven here Let me explain.

On the HVAC plan that you posted, over the drum room, you show a blue flex feed line, and to the left of it is a red line that the legend says is a RETURN from drum room. To the right of the flex, is a turquoise line the legend says is a feed to the upstairs room.

However, in picture 4 in set 3 of 4, taken from within the drum room, the picture shows the flex duct(blue), but to the left is a plain duct that you identify as a FEED to upstairs???? And further to the left, right at the corner(which is obscured), I can barely make out what appears to be another duct, which I ASSUME, by your dimensions, MUST be the RETURN for the drum room.

What I'm trying to determine IS....CAN the return duct drop down into the drum room via an 90 degree elbow, OR does it have to drop down into the CONTROL ROOM, and come through the wall. You said the END of the BAFFLE has to end at 62" from the centerline of the feed duct cavity. Well, thats a little ambiguous in relation to the angled wall. This one little detail is important to the overall baffle design.

Sorry for all the questions, but I need to get this right in order for the baffle installation to be a breeze. This box is going to be heavy, so INSTALLATION sequence is critical so you don't have to fight it. I have an idea to "decouple the box from the framing, but I need close tolerance dimensions RIGHT AT THAT corner to make it work. Like the dimension of the whole framing wall width at the exterior wall. So, take a look here and tell me a couple of other things.

Could you take a picture right at that corner, and then I can see what the deal is. Since the wall is at an angle to the joists, that little corner is the only place the duct could drop down into the baffle. Otherwise it would have to come through the wall. To MAXIMISE the air travel length, the box really needs to come up close to that wall. Anyway, I know this is getting a little time consuming but it'll pay off in the end.

BTW, the drawing shows the walls as your interior "room in a room" framing, and the exterior wall is INCORRECT. I'll fix that in order to dimension the box within the boundarys of the RC and drywall. Thats why these dimensions are critical.

 

[RICK FITZPATRICK]

And finally this one(4 attachments maximum allowed.)

 

[Velvet Elvis]

Rick,

The one that you assume is a return from the drum room is actually a feed to the second floor of the house... that's why I didn't put it on the plan. Once it enters the wall, it becomes flex pipe and snakes through a ton of places to get to the second floor where it does absolutely nothing because the flow is too restricted

The return in the drum room has not yet been placed, so it can go anywhere.

I'll gladly take some detail pictures of that wall tonight.

The feed to the drum room is rigid pipe right now, from pre-existing work in the basement, but I plan on changing it to flex and will have the ability to move it over a few trusses if we want.

I'll post pictures later!!

Jim

 

[RICK FITZPATRICK]

The one that you assume is a return from the drum room is actually a feed to the second floor of the house...

In that obscure corner?

The return in the drum room has not yet been placed, so it can go anywhere.

See my drawing

The feed to the drum room is rigid pipe right now, from pre-existing work in the basement, but I plan on changing it to flex and will have the ability to move it over a few trusses if we want.

NO WONDER! Then WHAT is the flex line in the middle of the drum room?? To the upstairs? Actually, here is what would be ideal.

 

[Velvet Elvis]

NO WONDER! Then WHAT is the flex line in the middle of the drum room?? To the upstairs? Actually, here is what would be ideal.

Ok... allow me to correct my cranial-posterior insertion...

According to your drawing, the one on the far LEFT (looking at your drawing as is) *IS* flex pipe that feeds the drum room. It can be moved over toward the wall as needed.

The one in the middle is a rigid pipe feed up to the second floor and cannot be moved (but can be changed to flex).

The one to the right is a rigid pipe feed to the room above the studio and cannot be moved (but can be changed to flex).

I'll take exact pictures of the pipes and their locations this evening.

Jim

 

[RICK FITZPATRICK]

Here is why. If possible. Then I'll section the box and show you how to build it.

 

[Velvet Elvis]

Ok, Rick... here are some photos for ya.

The first photo shows the far left (the right of your drawing) of the drum room. The flex just out of view is the return for the control room. The first rigid is the feed to the bedroom above the studio. The second rigid is the feed to the second floor. Then we have a bathtub opening I need to seal up and then the feed to the drum room.

Second picture is the same, just moving over a few trusses.

Third picture is the same, moving over again a few trusses (you would now be against the outside wall).

Fourth picture shows the whole shooting match from the doorway to the other booth. You can see that the trusses are not exactly empty

Jim

 

[Velvet Elvis]

Now... a couple pictures just to show some progress in the theater room.

First picture is of my sound caulking up above the sill plate/foundation.

Second picture is the front row of outlets and A/V patches (speakers, video etc) wrapped with the fire putty.

Jim