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Old 05-16-2009, 11:10 AM   #1
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Attic converted to second floor


Any suggestions to cool down a attic that's been converted to a second floor?

Attic is converted and roughed in for a second floor. It gets to be about 140 degrees in the summer. There still are two turbines on the ceiling one, on each end of the second floor. Second floor is about 600 square feet, with A frame ceilings extending up to about 12'.

Walls have been furred out at about 5'. There is a 3 ton unit cooling the downstairs. Am in the process of connecting the downstairs central air ducting with the upstairs to not have to buy another central unit for the upstairs. The central air unit, and the plenum are directly downstairs from where the location is of the upstairs. So I've cut holes in the plenum and added 10" hardpipe ducting for upstairs. Once upstairs, the 10" piping is converted to 7". Everything is still in works so changes can be made. It costs a lot to run the air to keep both floors cool, when usually only the top floor or the bottom floor needs to be heated or cooled. Also I'm in the South. A lot of humidity and moisture. I am underneath a 100' tree.

What type of attic fan do I need, or ceiling fan should I install. Also the electrical is in the process of being upgraded from a 100amp to a 200 amp system, so it is all changeable at this time.

Any suggestions to cool down a attic that's been converted to a second floor?

A couple of heating and air specialists said another central air unit is needed to cool the upstairs due to the size of the square footage of the ceiling space. Dollars don't make this possible.


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Old 05-16-2009, 11:17 AM   #2
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Attic converted to second floor


A mini split would have been the way to go.

How well did the 3 ton cool before you finnished and added this area.
It may not be big enough.

I doubt reducing to 7" was a good thing to do.
When you find out it doesn't cool right. It will be a bit too late to increae it again.

I'd run the 10" all the way.
Its easier to close down a damper if the 10" is too big. The to reopen things later.

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Old 05-16-2009, 11:41 AM   #3
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Attic converted to second floor


Where are you located?
How much insulation did you/are you installing?
No ridge vent ?, what about soffit vents?
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Old 05-16-2009, 03:39 PM   #4
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Attic converted to second floor


You might want to consider reflective film inside the roof sheathing before you insulate. And double check that the insulation ventillation is appropriate (doesn't sound like it will be - should should have a roof vent and vent sleeves). On the upside, an undersized system will remove the humidity nicely!
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Old 05-27-2009, 10:25 AM   #5
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Attic converted to second floor


Quote:
Originally Posted by Scuba_Dave View Post
Where are you located?
How much insulation did you/are you installing?
No ridge vent ?, what about soffit vents?
Thanks, for the response, am much appreciative for all suggestions. I'm in Hot Springs, Arkansas where it's really hot and humid in the summer and wet and cold in the winter.
The attic with an A frame, on both ends, has walls that are roughed in and furred to be 5' on each side. Where the walls have been furrred out that is where the hard pipe is lying on the floor which connects the upstairs to the downstairs central air. There are two turbines, one on each end. The rafters are original and true 2 x 4s. I've not put any insulation, or sheet rock upstairs, until the heating solution is found. When I redid the roof, I put white cedar for the soffits, but didn't put any soffit vents..., which I'll probably will put in? Every so two feet or so right?
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Old 05-27-2009, 10:31 AM   #6
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Attic converted to second floor


[quote=beenthere;274351]A mini split would have been the way to go.

How well did the 3 ton cool before you finnished and added this area.
It may not be big enough.

I doubt reducing to 7" was a good thing to do.
When you find out it doesn't cool right. It will be a bit too late to increae it again.

I'd run the 10" all the way.
Its easier to close down a damper if the 10" is too big. The to reopen things later.[/quote

The upstairs was never finished as far as the insulation and sheetrock. When the air ran, in the summer when it was really hot, it didn't seem to cool the upstairs down. Although, downstairs it did feel cool.
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Old 05-29-2009, 09:01 AM   #7
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Attic converted to second floor


Quote:
Originally Posted by sktn77a View Post
You might want to consider reflective film inside the roof sheathing before you insulate. And double check that the insulation ventillation is appropriate (doesn't sound like it will be - should should have a roof vent and vent sleeves). On the upside, an undersized system will remove the humidity nicely!
I believe I can't use reflective film because the rafters are true 2 x 4s and after putting the insulation and sheetrock, there will not be enough air space, which needs to be 1/2" to 3/4" space where the insulation sits. That's what top foil said, that there needs to be an air space.
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Old 05-29-2009, 09:13 AM   #8
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Attic converted to second floor


Quote:
Originally Posted by rebuildergirl View Post
I believe I can't use reflective film because the rafters are true 2 x 4s and after putting the insulation and sheetrock, there will not be enough air space, which needs to be 1/2" to 3/4" space where the insulation sits. That's what top foil said, that there needs to be an air space.
Yes, that's what the vent sleves are for. They go between the roof/reflective film and the insulation to provide about a 1" space. They're usually made out of a plastic material with a cross sectional shape as follows:
_______ Roofing

\_____/ Sleve
======
====== Insulation
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Old 05-29-2009, 04:15 PM   #9
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Attic converted to second floor


I would have built out from those 2x4 rafters to allow more insulation. I have R30 & R38 in my cathedral ceilings
Heatig & cooling will be effected by how much (or how little) insulation is installed

Rafter vents:

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Old 05-31-2009, 11:37 AM   #10
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Attic converted to second floor


In finishing the second floor, which was a attic and now is a living space with two turbines, cathedral ceilings, and rafters that are true 2 x4s. A friend suggested to just put insulation between the rafters, and use a thicker sheetrock of 5/8" to help insulated it. He also said to cover the two turbines with sheet rock. Hard pipe pipe is run which attaches to the central air unit downstairs. It is 10" running up, and then get downsized to 7". Any suggestions for helping with the hot summer months in the humid south?




Quote:
Originally Posted by Scuba_Dave View Post
I would have built out from those 2x4 rafters to allow more insulation. I have R30 & R38 in my cathedral ceilings
Heatig & cooling will be effected by how much (or how little) insulation is installed

Rafter vents:

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Old 05-31-2009, 11:47 AM   #11
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Attic converted to second floor


Hi there,

Nice shots, I understand now. I'll try and take some pictures today of mine..., and will post them this afternoon, but my cathedral ceilings are the actual ceiling. There is a lot of space on top above where the can lights are positioned. Are you suggesting to put 2 x 6s next to the ceiling rafters 2 x 4s, in order to fur it out to have more room to put the reflective stuff allowing dead air space with that plastic stuff you're showing in the picture and r30 insulation?
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Old 05-31-2009, 01:47 PM   #12
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Attic converted to second floor


http://www.energystar.gov/index.cfm?...sulation_table
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Old 05-31-2009, 02:44 PM   #13
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Attic converted to second floor


Attached are some pictures of the converted attic to second floor. Two rooms about 600 square feet, walls have been furred out to be five feet.

Quote:
Originally Posted by Scuba_Dave View Post
I would have built out from those 2x4 rafters to allow more insulation. I have R30 & R38 in my cathedral ceilings
Heatig & cooling will be effected by how much (or how little) insulation is installed

Rafter vents:

Attached Thumbnails
Attic converted to second floor-attic_680_w_res_72.jpg   Attic converted to second floor-attic_cropped_diy_chatroom_specifications_second_room_toppart_picture_room_2.jpg   Attic converted to second floor-attic_secondroom_bottompart_walls_furred_to_five_feet.jpg   Attic converted to second floor-first_room_600z-sized_res_72.jpg   Attic converted to second floor-second_room_complete_pic_680_res_72.jpg  

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Old 05-31-2009, 09:44 PM   #14
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Attic converted to second floor


Does R13 in a 2x4 roof meet remodelling codes? What about the 2x4 rafters, do they meet code? Sistering the 2x6 or 2x8s to the existing 2x4 rafters souds like a great idea but I think it should have been done before the knee walls went in
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Old 05-31-2009, 09:51 PM   #15
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Attic converted to second floor


R13 meets code for walls, not for ceilings
I put R19 in my walls, R30 or R38 in the ceiling
Heating/cooling costs are not going down
Pay now & do it right, or pay every year

2x4's meeting code:
Depends upon the span they cover
ANd how far apart they are - 16" OC, 24" OC or ?

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