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<blockquote data-quote="Motor Mouse" data-source="post: 266898" data-attributes="member: 703">i think the original question may have been in regards to the 5/8 inch sheetrock and the weight it can carry without sagging a few years later or worse tearing loose and dropping! is the rock nailed or screwed and how often? 24&quot; inch spacing on the rafters.&nbsp; Google the subject .... more info you want! You can go with either fiberglass or cellulose blow in. Both have advantages and disadvantages. In your case fiberglass might be the better choice as it will be lighter. Another advantage is it does not settle like cellulose. But cellulose has some advantages over glass. Sheetrock is rated on the load it can carry. It is easy to find that info as well as weight per square foot for a given R value for both insulation types.i agree with Kurtr...no vapor barrier on the ceilings! But air tight on the walls. Depending on your construction you will have to use the styrofoam baffles between each rafter to block the blow in insulation from getting into your soffit area. They are cheap and staple in place.area.</blockquote>

[QUOTE="Motor Mouse, post: 266898, member: 703"] i think the original question may have been in regards to the 5/8 inch sheetrock and the weight it can carry without sagging a few years later or worse tearing loose and dropping! is the rock nailed or screwed and how often? 24" inch spacing on the rafters. Google the subject .... more info you want! You can go with either fiberglass or cellulose blow in. Both have advantages and disadvantages. In your case fiberglass might be the better choice as it will be lighter. Another advantage is it does not settle like cellulose. But cellulose has some advantages over glass. Sheetrock is rated on the load it can carry. It is easy to find that info as well as weight per square foot for a given R value for both insulation types. i agree with Kurtr...no vapor barrier on the ceilings! But air tight on the walls. Depending on your construction you will have to use the styrofoam baffles between each rafter to block the blow in insulation from getting into your soffit area. They are cheap and staple in place. area. [/QUOTE]

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