Units can be placed end to end to achieve longer length. The metal ends overlap loosing 1 foot per2 units. Some companies will want you to overlap 2 feet.
example: (2) 18 x 28 units would give you an overall length of 55 feet long by 18 wide. 
CALL 405-381-4373  www.bestbuymetalproducts.com 

use menu on left side for pricing