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pdx_gal 09-11-2009 01:27 AM

ceiling options for 30" o.c. rafters
I'm finishing an unfinished upstairs room in my 1 1/2 story house, built in 1920. The rafters are 30" o.c. Originally they were 2x4, but I had them sistered with 2x8s for extra strength and to accommodate R20 insulation. The plan is to cover the rafters as is, for a cathedral ceiling.

I planned to use 5/8" drywall to finish the ceiling. However, USG states the maximum spacing for 5/8" sheetrock is 24" o.c.

So....can I get by with using 5/8" drywall and hope it doesn't sag? Maybe add some blocking between the rafters for additional support? What other options are there?

Thanks for any ideas or stories of your own.

buletbob 09-11-2009 06:05 AM

What kind of insulation did you use? With 30" on center spacing. You could install 1x2 or 1x3 16" oc perpendicular to the bottom of the rafters, this way you could use 1/2" drywall.

bjbatlanta 09-11-2009 09:06 AM

"Strapping" with 1"x's as Bob suggested would be your easiest solution and 1/2" is acceptable.

pdx_gal 09-11-2009 11:47 AM

Thanks for the great advice
Buletbob and bjbatlanta, thanks for your helpful advice. Sounds like consensus. The insulation is fiberglass batts, which I can pretty easily shift a bit to nail in some blocking or "strapping" (a new vocabulary word for me). So will do that. And thanks for the tip on using the 1/2" then instead of 5/8"....will save some $$ and be easier to handle. This forum rocks! :)

Scuba_Dave 09-11-2009 12:01 PM

The 1x2's tend to split...I've used the 1x3's with better results

bjbatlanta 09-11-2009 01:02 PM

I agree, and it's easier to hit a wider piece of wood, especially for a DIY'er working overhead.....

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