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Attic insulation - is it ok to put R60 loose fill insulation on sheetrock ceiling?

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I need to add insulation in my attic. Can the sheetrock/plaster ceiling below support R60 loose fill?

 thank you

 Painterly
asked in House Energy Savings by painterly (120 points)
edited by darekrudy
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1 Answer

0 votes

Hi Painterly,

 
Unfortunately I can’t answer your question because I know nothing about your house / its attic (framing span, sheetrock thickness, how well is it secured), the location / climate, ventilation in your attic, loose fill type (cellulose / fiberglass / rock wool). 
Maybe the table below will help:
 

Recommended Specifications by Insulation Type

 

Cellulose

Fiberglass

Rock Wool

R-value/inch

3.2 3.8

2.2 2.7

3.0 3.3

Inches (cm) needed for R-38

10 12 (25 30)

14 17 (35 43)

11.5 13 (29 33)

Density in lb/ft 3 (kg/m 3 )

1.5 2.0 (24 36)

0.5 1.0 (10 14)

1.7 (27)

Weight at R-38 in lb/ft 2(kg/m 2 )

1.25 .0 (6 10)

0.5 1.2 (3 6)

1.6 1.8 (8 9)

OK for 1/2" drywall, 24" on center?

No

Yes

No

OK for 1/2" drywall, 16" on center?

Yes

Yes

Yes

OK for 5/8" drywall, 24" on center?

Yes

Yes

Yes

Read more at: http://www.doityourself.com/stry/loosefillinsulations#b#ixzz24sefS8Bt

answered by darekrudy (21,730 points)
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