jpavlik

"Why is the finished ceiling height default set at 97 3/8" OR and OR not OR 96" or 8'

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"Why is the finished ceiling height default set at 97 3/8" OR and OR not OR 96" or 8'

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The Finished Ceiing (F) is equal to the Rough Ceiling (E) minus the Ceiling Finish (J). So whatever values you've entered in E and F will determine J.

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I think it is determined by the lumber length for standard wall studs in your area.

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1 hour ago, jpavlik said:

      

"Why is the finished ceiling height default set at 97 3/8" OR and OR not OR 96" or 8'

 

As others have said about actual stud height.....but the reason is framing should be in rough dimensions and once you add Sheetrock lid and flooring you should be at (or close) to 8’/9’ fin. dimensions.

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That's exactly why...Eight foot pre-cuts are common in every US lumberyard.

 

97-3/8ths  allows for 3/4" flooring and 1/2" or 5/8" Sheetrock at the ceiling.

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Agreed with all of the above- industry standards.

common studs lengths:

88 5/8"

92 5/8"

104 5/8"

 

Then add 4 1/2" for plates creates rough wall height.

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25 minutes ago, johnny said:

 

As others have said about actual stud height.....but the reason is framing should be in rough dimensions and once you add Sheetrock lid and flooring you should be at (or close) to 8’/9’ fin. dimensions.

 

I forgot the flooring. F=E-(J+K).

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The same reason that standard wall studs are 92 5/8", so you don't have to trim all of your sheetrock.

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From the department of ridiculous redundancy - "what they said".  That standard stud at 92 5/8" is called the "KD Stud for an 8 foot ceiling".

 

http://forums.finehomebuilding.com/breaktime/general-discussion/framing-lumber-kd-or-not

 

And, even though technically the term means Kiln Dried (which has nothing to do with length), if you order KD Studs, you're going to get them precut to this 92 5/8", developed as an industry standard to fit the drywall and so every carpenter doesn't have to cut every stud in the field.

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Precut studs in this part of Northern CA are 92 1/4.

 

This results in a wall frame height of 96 3/4 ( the actual measurement will usually be

@ 1/8 in over due to imperfections in plates etc.)

 

Allows for 5/8 in drywall ceiling with no wall board trimming.

 

On a slab, an 8 ft piece of sheathing, held 1/2 in. up from the bottom

of the bottom plate, just makes to within 1/4 in of the top of top half of doubled top plates.

 

To me, a longer, even just a little longer, precut stud could mean buying 9 ft sheathing and trimming it all down.

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That's  what seemed off here.  The default set my stud lengths at 94 3/8" not 92 5/8"

Here in Michigan pre-cut are 92 5/8".

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1 hour ago, JJohnson said:

Precut studs in this part of Northern CA are 92 1/4.

 

This results in a wall frame height of 96 3/4 ( the actual measurement will usually be

@ 1/8 in over due to imperfections in plates etc.)

 

Allows for 5/8 in drywall ceiling with no wall board trimming.

 

On a slab, an 8 ft piece of sheathing, held 1/2 in. up from the bottom

of the bottom plate, just makes to within 1/4 in of the top of top half of doubled top plates.

 

To me, a longer, even just a little longer, precut stud could mean buying 9 ft sheathing and trimming it all down.

+1 in Northern CA

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6 hours ago, JJohnson said:

Precut studs in this part of Northern CA are 92 1/4.

 

This results in a wall frame height of 96 3/4 ( the actual measurement will usually be

@ 1/8 in over due to imperfections in plates etc.)

 

Allows for 5/8 in drywall ceiling with no wall board trimming.

 

On a slab, an 8 ft piece of sheathing, held 1/2 in. up from the bottom

of the bottom plate, just makes to within 1/4 in of the top of top half of doubled top plates.

 

To me, a longer, even just a little longer, precut stud could mean buying 9 ft sheathing and trimming it all down.

 

Yep,  what JJ said.  

 

I think it it varies from east coast to west coast.

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I round up to 97”. I like sitting on fence,  right in between east coast and west coast.

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13 hours ago, dshall said:

I round up to 97”. I like sitting on fence,  right in between east coast and west coast.

me too

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The 1/8" must come from the common practice to use 5/8 sheetrock on ceilings.  On goes the rock, then with a 97-1/8 rough ceiling your rough floor to ceiling is now 96-1/2", just right for two widths of 48" rock on the walls lifted up 1/2" with that little rocker the guys keep in their pocket.

 

 

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4 hours ago, GeneDavis said:

The 1/8" must come from the common practice to use 5/8 sheetrock on ceilings.  On goes the rock, then with a 97-1/8 rough ceiling your rough floor to ceiling is now 96-1/2", just right for two widths of 48" rock on the walls lifted up 1/2" with that little rocker the guys keep in their pocket.

That's the way it is for our area.

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