when should pressure treated lumber be used when a ledger is installed to hold a stair assembly?\nthe ledger…

when should pressure treated lumber be used when a ledger is installed to hold a stair assembly?\nthe ledger is less than 2\ thick.\nthe ledger is fastened with lag screws.\nthe ledger is fastened to a concrete floor.\nthe assembly is in an area of high humidity.

when should pressure treated lumber be used when a ledger is installed to hold a stair assembly?\nthe ledger is less than 2\ thick.\nthe ledger is fastened with lag screws.\nthe ledger is fastened to a concrete floor.\nthe assembly is in an area of high humidity.

Answer

Brief Explanations:

Pressure - treated lumber is used to resist decay and rot. In high - humidity areas, regular lumber is more prone to these issues, so pressure - treated lumber is necessary. The thickness of the ledger, the type of fastener, or the material of the surface it's fastened to are not the main reasons for using pressure - treated lumber compared to humidity.

Answer:

The assembly is in an area of high humidity.