If a room is 14'x13' and the ceiling is 8' high - approx. how many 4'x8' drywall sheets would I need?

Question

Lets say each sheet of dry wall costs $9. How much would this room cost me?

Can someone help me ? I cannot figure out the math. Also, can you tell me what formula you used so I can apply this to other rooms in my house?

Thanks!

Answer 1

If this were math class, you would want
(14*8*2+13*8*2+13*14)/32=20

In real life, work in whole sheets. Unless you can be sure that cuttoff pieces can be used someplace else. Assume that it is waste.
count up how many 4' sections per wall
14'=4 4' sections
13'=4 4' sections
since two of each wall, you want a total of 16 sheets for the wall

For the ceiling decide, in whole numbers, how many sheets it will take to cover a 4' section. In this case it will be 2 sheets to span 14'. Multiply this by the number of sheets you used to cover the 13' wall (4). So you need, 2*4=8 sheets to cover the ceiling.

So buy 16+8=24 sheets.
24*$9=$216
Yes, you get some waste, but that is much more efficient than trying to tape all of the seams you get by trying to piece things in.

Answer 2

The room has four walls. There will be two walls of 14 X 8 and two walls of 13 X 8 size. Since you want to use 4 X 8 size sheets, you would probably need to cut them to size and use. If cutting losses are negligible, you can work out the total requirement for that room by adding the total area of the sheets needed:

2 X 14 X 8 + 2 X 13 X 8 = (28 + 26) X 8

Since each sheet is 4 X 8, we need 54/4 = 13 and a half sheet. Since the shop may not sell you a half sheet, you will need 14 sheets and at $9 per each sheet, you will need 14 X 9 = 126 dollars for that room.

I hope the method is clear now. If the ceiling height is different, you will need to calculate the total area and then divide by the area of each sheet. For example, the total area of the walls of that room will be 54 X 8 = 432 sq.ft and that needs to be divided by 4 X 8 = 32 and that again gives us 432/32 = 13 and one half sheets.

I am assuming that the ceiling does not need the sheets.

Answer 3

Not all that hard. I assume that you will put the dry-wall up with the 8 ft side from bottom to top. Then, the problem becomes finding the number of 4 ft widths of dry-wall to equal the perimeter of the room. The 14x13 room has a perimeter of
2* 14 + 2 * 13 ft = 54 ft So you will need 54/4 sheets of drywall or 14 sheets. At $9 a piece, that is $ 126 (tax not included)

Answer 4

Since the ceiling is the same height as the sheets of drywall, all we need is the perimeter
p=2w+52l=2*13+2*14=26+26=54'

the sheets are 4' wide so
n=54/4=13.5 or 14 sheets of drywall.
at $9/sheet it will cost $9/sheet*14sheets=$126 for the material.

Answer 5

I guess the first answerer doesn't have drywall on his ceiling. Nor does the second.

You're going to need 8 more sheets for the ceiling or $72 dollars more.

One thing you have to be concerned about is that the joists are either 18 or 24 inches on center, so you can't use partial pieces (at least not in their entirety) since the edges must be on a stud. Drywall also needs to be fastened at specific intervals and points, so that might preclude the use of partial pieces in some situations. It's probably best just to assume that you cannot use partial pieces.

Answer 6

Area of one wall = 14'*8'=112 sq. feet
Area of opposite wall to this would also be the same.
Area of other wall =13'*8'=104 sq. feet

Total area of all four walls = 112+104+112+104
=432 sq. feet.
Area of sheet = 4'*8'=32 sq. feet


Assuming that sheets can be cut to requirement & pieces of sheets can also be used.
No. of sheets required = 432/32=13.5
You will have to buy 14 sheets each costing $9.
The cost of 14 sheets = 14*9=$126.

If pieces of sheets cannot be used then
14'*8' wall would need 4 nos. 4'*8' sheets
13'*8' wall would also need 4 nos. 4'*8' sheets
Total sheets required = 4+4+4+4=16
cost = 16*9=$144

Answer 7

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