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-   -   Attic Insulation Help (http://www.houserepairtalk.com/f106/attic-insulation-help-11254/)

charbear 04-28-2011 04:32 PM

Attic Insulation Help
 
I have a two story (maybe 1 1/2 since the front half of the house has a 2nd story while the back half rooms have vaulted ceilings with no 2nd floor on top of them. The upstairs ductwork has always been somewhat inadequate in my opinion. Relatively little air flow comes out compared to the downstairs vents. We try and even this out by closing some downstairs vents. We are in Central FL and it gets HOT for a long time. I am thinking about blowing in more insulation in the attic. Questions:

I have included links to pics if it would help. The insulation is pink blown in and is mostly abut 8", though some spots are closer to 6 and even 4 in a few places. Do I need more and how much?

Also, on the vaulted ceiling area, there is no insulation. I assume this would be so as to not block the airflow as it comes up from the downstairs rooms, passing above the vaulted ceilings and into the attic to escape. The pics show a bit of the upstairs insulation and also show a "hole" which is what leads up from above the downstairs ceilings. Was the supposed to be insulation in there or is this truly to be "uninsulated".

In the "drawing" at the end, the 4 levels are the downstairs floor, downstairs ceiling on front side of house, the vaulted ceiling in red, ceiling of 2nd floor (attic above).

Thanks!

insulation Photo Gallery by charbear at pbase.com
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Perry525 05-05-2011 11:53 AM

There is no effective insulation in your home.

There are various ways you can solve the

problem, each has a cost, but doing the job

properly will make your home much nicer to

live in and it will be a lot cheaper to run.

How long do you intend to live there?

The most effective way to insulate your

home from the sun, it to take the roof off

and cover the rafters with a sandwich of

oriented board and polystyrene and then

put the roof back on.

(You need at least 5 inches of polystyrene

in the sandwich....8 inches is better)

This system is called SIP's.

Done properly this isolates your home from

the effects of the sun. The oriented board

sandwich is fixed to avoid any heat bridges.

Most of the heat gets into your home by

conduction, some by radiation and some by

convection.

Repeat the system over the walls and you

have one cool home.

This solution is the best you can get and

really the only way to keep your vaulted

ceilings looking great and keeping you cool.

Take a look at the duct work, is it insulated

and air tight?

The fact that it works at all in the heat is

some kind of miracle. It needs at least 4

inches of sprayed foam covering all sides,

again 8 inches will do a better job.

If the above proposal is too expensive, then

fitting sheets of polystyrene cut to size

between the rafters and below the rafters

will provide a great improvement. Use one

inch and two inch thick sheets, cut them

with a knife to a push tight fit.

After doing the roof, fill the spaces between

the joists in the same way. For the best

result pull the ceilings down and fit three

inches of polystyrene sheet across the

ceilings below the joists to stop the

conducted heat coming through the joists

into the rooms.

This system will spoil the look of your

vaulted ceiling but, you can create another

fake ceiling below your existing one.

Then use the same system in the outside

walls.

Cellulose and fiberglass are rubbish and

cannot keep out the heat, they are both

conductors of heat, remove the so called

insulation you have and dump it.

joecaption 05-06-2011 06:56 AM

Recommended Levels of Insulation : ENERGY STAR


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