What is your garage floor surface made of?
One concern is to have a noncombustible surface in a garage. Here is an example where there was asphalt installed in the garage. Asphalt is allowed by exception in carports but not allowed in garages.
Another issue with asphalt is that it is not structural surface and is susceptible to gas/petroleum products that will cause damage.
Asphalt is softer than concrete and is more susceptible to sinking and rutting. Since asphalt is not structural it is only as good as the compacted materials base under it.
https://m.afscme.org/news/publications/workplace-health-and-safety/fact-sheets/pdf/Asphalt-AFSCME-fact-sheet.pdf
From the 2015 IRC
R309.1 Floor Surface
Garage floor surfaces shall be of approved noncombustible material.
The area of floor used for parking of automobiles or other vehicles shall be sloped to facilitate the movement of liquids to a drain or toward the main vehicle entry doorway.
R309.2 Carports
Carports shall be open on not less than two sides. Carport floor surfaces shall be of approved noncombustible material. Carports not open on two or more sides shall be considered to be a garage and shall comply with the provisions of this section for garages.
Exception: Asphalt surfaces shall be permitted at ground level in carports.
The area of floor used for parking of automobiles or other vehicles shall be sloped to facilitate the movement of liquids to a drain or toward the main vehicle entry doorway.
If you find any errors or have additional information that would expand on any code, building standards or manufacturer requirements please let me know.
NCW Home Inspections, LLC is a Licensed Washington State Home Inspection service located in Wenatchee Washington serving Chelan County, Douglas County, Kittitas County, Okanogan County and Grant County Washington and the cities of Wenatchee, Leavenworth, Cashmere, Oroville, Cle Elum, East Wenatchee, Quincy and many more…
Your Wenatchee and Chelan Professional Real Estate, Home and Structural Pest Inspection Service
Coordinator & Instructor- Fundamentals of Home Inspection- Bellingham Technical College
Former WA Home Inspector Advisory Licensing Board
www.ncwhomeinspections.com 509-670-9572
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