# What Is The Formula For Determining How Much Sheetrock Is Needed?

It certainly is easier to hit the studs with nails or screws if the sheets are installed horizontally--at the cost of one additional horizontal joint across the wall. It is a lot harder to have to share the 1 1/2 surface of a stud between two panels. Sheetrock, being made of paper and plaster, don't lend much more to the strength of a partition wall, in my humble opinion.
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Anonymous commented
Sorry, this was meant as comment to Kathil's answer.
You never stand vertically. You lose all structural strength. It would work only in a small area, such as a small bathroom.
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Most sheetrock comes in 4' wide x 8' long sheets.
If you are sheetrocking walls, and they are 8ft. High, then just measure the length of the walls in feet and divide by four.
If you are sheetrocking a ceiling, calculate by multiplying the length of the ceiling by the width. This will give you the square footage. Then figure the square footage of one piece of sheetrock. 4'x8' =32 square foot. So one piece of sheetrock will cover 32 sq. Ft.
If you are rocking the ceiling, be sure to lay the sheetrock horizontally across the beams. If you screw them into the beams in the same direction that the beams are running, then you will lose stability and the sheetrock will start to sag over time.
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Anonymous commented
I thought studs were either 16" or 24" o.c. I wouldn't want to do the ceiling, too unwieldy and you need several helpers to hold it up and you'l have to feed them...not worth the trouble. ; )
Rena Chisholm commented
Ahahahaha. Yeah, it could get expensive feeding a bunch of hungry fella's for sure.
I think modular and mobile homes are studded differently. Not real sure about them now days though. Have also seen the walls in our house studded differently. Lol. The bathrooms are only 12 inches apart. Go figure.
Could be there are different building codes according to where you live in the world.
Rena Chisholm commented
You are right , Kathil, always lay the sheetrock horizontally for stability.
Oops, this was meant as a comment under Kathil 17's answer.
:0)