Okay, so you're interested in using Floodsill™ for your basement project. Great!
But how much do you need to order?
A typical 1,000 to 1,500 square foot basement will require about 60 linear feet of perimeter wall coverage (that's a little less that 1 box of F425) and depending on the number of partition walls about 50 linear feet of partition wall coverage (that's a little less than 1 box of F475).
So most typically, you will need to order 1 box of F425 and 1 box of F475.
To be sure you should measure:
F425 = Cavity Walls - Measure the total perimeter of all exterior walls (cavity walls) to be constructed.
F475 = Partition Walls - Measure the total perimeter of all interior walls (partition walls) to be constructed.