Welcome, my name is XXXXX XXXXX I will do my best to help you with your issue
You start in the middle of the room. Strike a chalk line which should fall in the middle of the center firring strip start your first tile at the center of this line
You could use a laser but these ceilings were installed for years before lasers came along.
You then work your way out from the middle setting your tile along the chalk line
Shoul it be the middle end or the middle center of the room
Middle center. Start with your first tile corner on the mid point of the chalk line in the center firring strip. Then work out from there. It's best to finish your first course along the chalk line then move to the next course
If you want to be really precise allow for the staple tab to overhang the line so it's the edge of the finished tile on the line
OK Ill start at the middle if the room and do a line then do another, trouble is to get a straight firts line
That's why you snap a chalk line and follow that
After measuring the fir strips I find they are 12 inches apart winding up with about a 5 inch last tile next to the long wall so its not possible to start in the millde with these existing fir strips due to their spacing . I am just going to have to start at the one wall and do a row down the 17 ft side as straight as it can be. Then do a second row untill I get to the 5 inch last row of tiles.Thats why I was so pickey about getting them straight starting out and maybe going by a laser light the entire 17 ft length
Can Tile Bond work with polystyrene tiles?
Do you feel staples would tear polystyrene easily. Otherwise I will use them ,