[Greenbuilding] Weight of spray cellulose

[David Wentling]

Remember to watch the airseal barrier location where dissimilar surfaces meet. If there is a drop ceiling lower than the main ceiling and there is open area, there could be an infiltration/exfiltration pathway. Insulation layer (Cellulose) MUST touch the back of the airseal layer (drywall) with no gaps.

If you are concern with bowing of drywall due to dense packing, consider using 5/8” thick drywall on 16” center supports.

David Wentling

On Feb 18, 2017, at 7:45 AM, Sacie Lambertson <sacie.lambertson at gmail.com> wrote:

There is no closed cavity as such.  Rather it is a matter of the netted insulation going into the space at the end of a rafter run where the rafter meets the ceiling below, ie into the joist. The ceiling is open still, is no dry wall.   

The suggestion we staple cardboard in this space is a great one, easily done.  Thanks Mike for the suggestion.  

If the existing ceiling is uneven, we'll strap the whole thing.

Thanks for the various responses.

Sacie

On Wed, Feb 15, 2017 at 12:19 PM, Clarke Olsen <colsen at fairpoint.net <mailto:colsen at fairpoint.net>> wrote:
True: I doubt in would stick to a ceiling.
Clarke Olsen
clarkeolsendesign.com <http://clarkeolsendesign.com/>
373 route 203
Spencertown, NY 12165
USA
518-392-4640 <tel:518-392-4640>
colsen at taconic.net <mailto:colsen at taconic.net>




On Feb 15, 2017, at 12:36 PM, Topher Belknap <topher at greenfret.com <mailto:topher at greenfret.com>> wrote:

> Greetings,
>
> I wouldn't wet spray cellulose into a cavity.  The only reason for wet
> spraying, that I can see, it to have it stick to a wall assembly which
> is still open to the space.  That way it can (and should) be thoroughly
> dried before putting on the wallboard.  Since it will be dried and firm
> by then, no additional force will occur for the wallboard.  For already
> closed spaces, blow *dry* cellulose to 3.5 pounds / foot^3.
>
> Thank you kindly,
>
> Topher
>
> --
> Topher Belknap
> Green Fret Consulting
> Kermit didn't know the half of it...
> http://www.GreenFret.com/ <http://www.greenfret.com/>
> (207) 882-7652 <tel:%28207%29%20882-7652>
>
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