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Old 11-21-2014, 12:37 PM   #1
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Plugging attic gaps

Bought a house and thinking of putting more insulation in attic. Saw on some shows where they suck out the old blown-in insulation, caulk any gaps from the living area, put baffles in to the ridge vents I have, and then blow in new.

A contractor told me not to bother caulking the gaps from the living area, that the extra insulation will seal it in, and to just go over the old blown in. My concern with the old blown-in is just today I have someone putting in vents for my two bathroom fans that were venting into the attic directly. Maybe after 40 years (age of house) of moisture in attic from bathroom fans, it would be better to remove?

Also, what type of blown in insulation is best?

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Old 11-21-2014, 01:07 PM   #2
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That contractor is an idiot. Move on from him. Fiberglass or cellulose will NOT stop air leakage from living space to attic, your first thought was correct.

Regarding keep the existing blown in and going over it, there are a lot of factors to figure whether or not that is optimal. That said, it is definitely a LOT easier to air seal if you get it out of there, and another x number of inches won't be very pricey. The hardest part is actually getting it out.

Cellulose is generally thought of as providing the best bang for the buck performance in blown attic insulation.
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Old 11-21-2014, 02:07 PM   #3
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I agree he has no clue.
If there's nothing wrong with the old like mold, animal waste or mouse droppings why would you get rid of the old? Just move it out of the way seal up the holes and move it back in place and add new.
Makes no since to remove it all if there's nothing wrong with it.
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Old 11-21-2014, 04:48 PM   #4
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We had my sons 1800 sq ft home done, all removed. Smells better. Now to seal and re-insulate. But have to change the ac venting and water piping first!
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