home wall insulation?


Old 04-29-01, 04:28 PM
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Our one story home is located in the Sacramento Valley of CA (it gets to 110 in summer). The house has 1" solid stucco exterior and 1" plaster over sheetrock interior walls. We have R-38 ceiling insulation and R-19 under the floors. Would it be economically wise to have the walls drilled and insulation blown in or does the dead air space provide nearly the same insulating quality?
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Old 04-30-01, 11:01 PM
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Location: Arlington, WA
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How much insulation is currently in the walls? A dead air space provides no insulation value. If there is none, then having cellulose blown into the walls would help. But look at your windows too. Adding wall insulation where there is none AND upgrading your windows to ones that are efficient enough to meet the Energy Star rating could cut your PG&E bill by as much as 50%, plus you may be in line for a rebate for at least some of the work.
Old 05-15-01, 07:28 PM
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If an existing exterior or interior wall for that matter has any insulation whatsoever in it..It is in my opinion a waste of money to have any additional insulation blown in...

The reason being is that when holes are drilled and insulation is blown in a wall with existing insulation what occurs is that the additional insulation fills in only around the area where the hole is drilled... The exisiting insualtion prohibits the blown insualtion from dropping and filling the entire cavity..

I have seen numerous remodels where the exterior siding and sheathing has been removed and you can see that less than 20% of the stud cavity actually gets filled with the blown in insulation

It might be a wiser idea to wait until you reside the exterior and install a foam board of some type prior to installing the new siding..

Good Luck

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