# Solving Screw Calculation for Rafter Tails

## Understanding Screw Calculation for Rafter Tails

**To answer your question**, if there are 3 boards each requiring 2 screws at each rafter tail, we need to first understand how to calculate the number of screws required for a full run of 27 feet.

## Calculating the Number of Rafter Tails

Given that a typical spacing for rafter tails is 16 inches apart, one foot would contain 12/16, or 0.75 rafter tails. So, for 27 feet, we have 27*0.75 = 20.25, but since we can't have a fraction of a rafter tail, we'll round up to a total of 21 rafter tails.

## Determining the Total Number of Screws

As each tail requires 2 screws per board, and we have 3 boards, the total number of screws required will be 21*2*3 = 126 screws.

## Conclusion

In conclusion, to calculate the number of screws needed for the full run of 27 feet with 3 boards each requiring 2 screws at each rafter tail, you would need a total of 126 screws.