### Question
What is the definition of friction surface?


### Answer
The definition of **friction surface** is as follows in *42 U.S.C. § 4851b*:

> an interior or exterior surface that is subject to abrasion or friction, including certain window, floor, and stair surfaces

#### Citation:
  - *42 U.S.C. § 4851b*
  - Heading: **CHAPTER 63A-RESIDENTIAL LEAD-BASED PAINT HAZARD REDUCTION**

