What type of insulation do I need?

thebigadApril 19, 2012

I have a 60-yr old brick house with some loose-fill insulation in the attic (a few inches at most). I need to add some more insulation to bring it up to standard.

1. Would it be feasible for me to do this myself or should I get a pro?

2. Is it OK if I put unfaced rolls on top of the existing loose fill? Or should I put more loose fill on? Or do something else?

3. If I do unfaced rolls, does anyone have any recommendations on types, brands, or where to buy for the best price? If I have to do loose fill, do I have to lug the spraying machine into the attic or can is the hose long enough to spray all over?

4. Do I need to buy those plastic things that prevent the soffit vents from being covered up or is that unnecessary?

Thanks!

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ionized_gw

Where do you live?

    Bookmark   April 19, 2012 at 7:52PM
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david_cary

Blow it - the hose is plenty long.

You should buy those plastic things but you could just skip the last 12 inches or so - not ideal.

    Bookmark   April 19, 2012 at 9:49PM
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thebigad

I live in Atlanta.

    Bookmark   April 20, 2012 at 9:00AM
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energy_rater_la

better do your air sealing at attic floor to inside house first. recessed lights, bath fans stove vents etc.

any duct sealing should also be done prior to insulation
install.
plenum to equipment connection, duct takeoff at plenum
and supply boxes to attic floor.
return caulked.

best of luck

    Bookmark   April 20, 2012 at 11:59AM
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mike_home

I have not read where fiberglass batts cannot be installed over blown in insulation. However the general consensus is it is better to add more blown insulation than layering a batt. I would be concerned about the batt sagging if you laid it perpendicualar to the joists. If you laid the batt parrallel, then the layer may be uneven.

There are several Youtube videos showing blown in insulation installation. It is a messy job, but doable for the DIYer.

    Bookmark   April 20, 2012 at 4:17PM
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energy_rater_la

there is no problem with unfaced batts over blown.
to install batts over existing blown it would
need to be unfaced batts.
you may need to special order it from hd or lowes.

I'd go batts over cellulose anyday. not everyone
agrees, but the fine particles from cellulose
finds its way into your living space via
cracks between attic and living space.

you should invest in the air sealing first.
and duct sealing if your ducts are in the attic.
lots of humdity issues in our area.
you don't want to filter hot humid attic
air thru the insulation and into your home.
caulk and mastics are easy to work with.

best of luck

    Bookmark   April 21, 2012 at 12:50PM
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