0 Helpful?

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 Aug 26, 2014 4:30 PM ET

Tags:

3 Answers

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

"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 Aug 26, 2014 5:22 PM ET

2.

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 Aug 27, 2014 12:27 PM ET

3.

Correction ... polyurethane glue, not PVC glue.

Answered by flitch plate
Posted Aug 28, 2014 7:19 AM ET

Other Questions in General questions

Ideal wall assembly for unconditioned shed

In General questions | Asked by Kevin Lynagh | Sep 27, 16

Insulating rafters in this area

In General questions | Asked by G S | Sep 27, 16

New mitsubishi mini split wall units

In Energy efficiency and durability | Asked by Whitney Scurlock | Sep 27, 16

Looking for ERV install design suggestions

In Energy efficiency and durability | Asked by John E. | Sep 27, 16

Choosing wall assembly discussion

In Green building techniques | Asked by Bernard Lam | Sep 27, 16
Register for a free account and join the conversation


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