If you are talking about corners, I like an inch. 3/4 will work, 12 inch makes it tough if your cuts are off at all.

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To be sure people do understand what I talk about, two red arrows.

 

If there’s any movements, the finish gauge nails will just pull out, for blocking on the ceilings and walls at the corners I always had an inch to play with and use ring shank nails!

just noticed your picture in that situation I would want a 2 x 4 at the top!

 

If there’s any movements, the finish gauge nails will just pull out, for blocking on the ceilings and walls at the corners I always had an inch to play with and use ring shank nails!

Thanks for that. I actually have some ring shank at home. I will acutally have other situation to ask but will do tomorrow, can not do without picture.
I just used 15g finish at that horizontal block and it is not way to go? I usually use framing nails but strip is 3/4 thick and plus 1 1/2 2X nail would go through. Yeah need ring shank in combo.

 

Anything other than a little piece would bother me.

 

You don't want the nailers to move when you push against them.

I use either a full 2x4 or a ripped in two 2x, depending upon how cheap I'm being....

 

I'm saying you want 2x stock up there.

My reason would be to give the drywall screws something solid to grip. Anything less than 2x I think you'd split a lot of wood with the drywall screws.

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I wouldn't use 1x material up there. As Platesurfer said just as I started typing, 3/4" isn't enough for reliable screwing or nailing. Use 2x material and shoot it on with 8D nails.

 

In some cases I use lighter gauge angle steel, especially in truss areas where I'm concerned with uplift. I'll line the upper perimeter at times, isolating both perpendicular and parralel rafters/ trusses to wall connections.

3/4 thickness minimum for ceiling when considering drywall is fastened to it 1st. Corners often need more thickness if you consume 1/2" of it with an intersecting sheet.

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What you show in the picture are called nailers, not blocking. Blocking is something different.
Do not use anything less than 2x and framing or preferably ring shank nails. And plenty of them.
This is not a good place to save a few pennies.

 

2x4 is typical for nailers, but 1x4 or 1x3 is typical for strapping

 

CORRECT ANSWER: 1.5"

 

I take my reply back. Didn't see the picture.

 

3/4 thick x 2.5"+ quality plywood strips..instead 3/4" thick natural wood...100 % glue if worried about splitting with natural wood furring strips.....Gluing wouldn't do much for screw splitting in the second arrow's application of 1x2" ...IMHO

A 🤡Super cheapskate could pre drill the drywall screws where needed......👨‍💻

 

I use scraps of OSB for intersecting walls and such. Hanger has never complained, but we also use tons of glue here.