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Old 06-07-2011, 07:18 AM
Location: Beautiful Rhode Island
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In a 1929 2 story house that has a small roomlike slanted ceiling unfinished space over a breakfast nook- small door leading into it from 2nd floor bedroom- used for storage space. It's kind of like an under the eaves type of space only a bit bigger.

Should insulation batting be put on the slanted walls and the floor or ?????? Not sure how this should be done. There's a little porthole window too.
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Old 06-07-2011, 09:08 AM
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The proper thing to do is ALMOST CERTAINLY to fully insulate the ENTIRE SPACE. The choice of insulation is VERY MUCH DEPENDANT on how you can control MOISTURE -- if the space can be VERY WELL VENTED you can use cellulose or fiberglass. If venting is less than optimal it would be foolish to use anything other expanding foam. The key is MOISTURE CONTROL and AIR SEALING, since expanding foam tends to make things very moisture resistant you have to be sure there is no place for warm moist air to condense where it hits cold.

Tricky but not overly expensive to CAREFULLY seal up all the sources of air infiltration FROM THE HEATED SPACE.Ideally you could have ventilation so outside air keeps the space DRY in winter. You probably need to consider upgrading that window too as single pane glass is poor insulator. Worst case you create a situation where cooking moisture creeps in to the space, condenses on cold surfaces and causes rot in the whole roof & ceiling.
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Old 06-08-2011, 09:26 AM
Location: CT - USA
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I agree with chet.
It is a good idea to insulate the space and maybe treat it like you would treat an attic: proper ventilation, beefy insulation and thorough air sealing and maybe even a radiant barrier.

Depending of what kind of moisture control and space you have there, foam board insulation, maybe even with a radiant liner, is usually less costly than spay foam and might work better than the batts because it doesn't absorb water, so it will not grow mold like paper faced fiberglass. It also has much higher R-Value per inch than fiberglass. Here's some info on insulation and R-Values per inch.

Insulation Materials - Spray Foam Insulation, Fiberglass, Cellulose, Polystyrene, Polyurethane Rigid

Alternatively, depending on your needs, you could include it in the living, conditioned area of the building envelope and treat it like a finished attic room, which depending on what you store in that space, might also be a good idea.
Your best course of action here would call in an energy conservation expert before you do anything.
Get them to perform a blower door test/thermal imaging test to detect poorly insulated areas, and air leakages.
They will help you determine which insulation to use, how much R-Value you need and where to apply it.
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