Helpful? 0

Ceiling strapping spacing recommendation to hold up 22" of blown-in cellulose

I am in the process of trying to determine how much strapping spacing is needed on a ceiling to support 22" of blown-in cellulose above it. The strapping is 1x4 pine and I plan on spacing 16" OC whixh makes the space between supports of 12". The strapping is holding 6 mil poly up against the bottom chord of the truss. There will be some ballooning of poly downward in those squares between truss and strapping. 5/8" Sheetrock will be used up against strapping to finish. Thanks in advance.

Asked by Matthew Michaud
Posted Tue, 08/26/2014 - 15:30

Tags:

3 Answers

Select your preferred way to display the comments and click "Save settings" to activate your changes.
1.
Helpful? 0

"We have blown very high R-values, up to R-100, and never had any issues with the ceiling sagging."

see here: http://www.greenbuildingadvisor.com/community/forum/green-building-techn...

Answered by Nick Welch
Posted Tue, 08/26/2014 - 16:22

2.
Helpful? 0

Mathew… I have dense packed cellulose, R60 between 24" OC rafters, cross strapped with dry 1 X3" pine purlins 16" OC, with ½" generic Home Depot (called low sag) drywall. We used high quality, drywall PVC glue (not the green stuff and not liquid nails) and screws. There is no visible sag or rounding.

Answered by flitch plate
Posted Wed, 08/27/2014 - 11:27

3.
Helpful? 0

Correction ... polyurethane glue, not PVC glue.

Answered by flitch plate
Posted Thu, 08/28/2014 - 06:19

Other Questions in General questions

Wet OSB - how much water can it take?

In General questions | Asked by colleen1 runyen | Dec 17, 14

What should I use to create a smooth base under a soft floating flooring?

In Green products and materials | Asked by Jacque Hyler | Dec 19, 14

Closed Cell Spray Foam on Roof Deck...shingle underlayment choice?

In General questions | Asked by Mark Helmrich | Dec 19, 14

Quarter Round on Rammed Earth

In Green building techniques | Asked by Terry Lee | Dec 18, 14
Register for a free account and join the conversation


Get a free account and join the conversation!
Become a GBA PRO!