Asked by: Sharice Berenguer
home and garden indoor environmental quality

Should you insulate the roof of an attic?

Last Updated: 16th January, 2020

A finished attic should be insulatedmuchlike the rest of the house, with insulation in the wallsandceiling. If your attic is already finished, it probablyisat least partially insulated. However, mostolderattics are under-insulated so it's a good ideatoraise the R-value where possible.

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In respect to this, does roof insulation make a difference?

The biggest difference between these two typesofinsulation is where they are installed.Atticinsulation is installed in the ceiling plane, whileroofinsulation is installed on the roof slope itself,aboveand below the rafters.

Likewise, should I remove old attic insulation before adding new? According to ENERGY STAR®, you can putnewinsulation over old insulation, “unless itis wet.“Faced” insulation should not be placedon topof existing insulation in the attic. Anynewroll or batt insulation installed overexistinginsulation in the attic needs to be without avaporretarder (face).

Beside this, will adding insulation attic make difference?

Homes that are not properly insulated can loseupto 20 percent of the conditioned air. Essentially, 20 percentofthe cost of heating and cooling the home is simply lost throughtheattic in many homes. Attic insulation increasetheeffectiveness of your home's envelope to retain cooled andheatedair.

Should you insulate roof rafters?

The insulation should not be installed intheroof rafters unless the ceiling finishes areapplieddirectly to the roof rafters. There is no advantageininsulating a cold attic from the cold outdoors.Instead,always insulate the floors, walls, andceilings thatseparate the warm interior from the coldattic.

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