You really need to provide more information about what you would consider as an acceptable finished product. You have implied that all carpet "grain" running in the same direction is one such requirement.
Do you have limitations or preferences on seam location? Do you want to minimize the number of seams? What is the maximum number of seams that you will accept? Why are you limiting your options to carpet which is produced in 12' widths? Etc.
Basic math would say that you are going have the following minimum carpet requirements if you purchase 12' carpet:
- A main piece 14' x 12'
- A second piece at least 2' x 12', assuming that the carpet cannot be purchased in fractions of a foot. This could be installed with one long seam (14') and one short seam (1'). But the carpet would not "run the same direction" for all pieces. Total carpet size is 192 sq. ft.
To have all of the carpet running the same direction and to use 12' wide carpet requires:
- A main piece 13' x 12''
- A second piece 7' x 12', from which two piece would be cut, both 2' x 7 1/2' This also has 2 splices, one 13' long and the other 2' long. Carpet waste would be very high and total purchased carpet size is 240 sq. ft.
I would never consider covering a 13' x 14' room with 12' wide carpet. One piece of 15' wide carpet that is 13' long gives you no seams. It requires 195 sq. ft. of carpet, just a bit more than the 192 sq. ft. for the first situation above. You get a better installation and pay for the same basic amount of carpet. And in five years you won't be seeing the seam area "opening up" and revealing itself if there is any traffic over it.
Good luck, Gideon
============================
Plush carpet, no pattern.
Obviously, there will be a seam but how much extra do I need to account for the seam to make sure the carpet runs the same direction.
C_kubie