Class C siding on a Type I building?

[Bob L A]

I have a client who wants to install a composite 'European style' siding by "Newtechwood" (similar composition to Trex) on a Type I building. All exterior locations. The siding would be installed over concrete soffits, and 10-15' above grade. Is this allowed?
thanks!

 

[RLGA]

The material is a plastic composite, so it is combustible. You would need to comply with IBC Section 1405.1 (2018). If the fire separation distance is 5 feet or less, then the material is limited to 10% of the exterior wall surface. If more than 5 feet, then you have unlimited use up to 40 feet in height. There are other requirements regarding the material's properties in Section 1405 that you should look at and compare to see if they comply. If the building is more than 40 feet high, then you will need to provide another material that is not combustible above the 40-foot elevation.

Section 1405.1 does have an exception for plastics complying with Chapter 26. However, the section on plastic composites (Section 2612) limits the application of plastic composites to decks, stair treads, handrails, and guards. Thus, the exception would not be an option for you.

 

[Bob L A]

The material is a plastic composite, so it is combustible. You would need to comply with IBC Section 1405.1 (2018). If the fire separation distance is 5 feet or less, then the material is limited to 10% of the exterior wall surface. If more than 5 feet, then you have unlimited use up to 40 feet in height. There are other requirements regarding the material's properties in Section 1405 that you should look at and compare to see if they comply. If the building is more than 40 feet high, then you will need to provide another material that is not combustible above the 40-foot elevation.

Section 1405.1 does have an exception for plastics complying with Chapter 26. However, the section on plastic composites (Section 2612) limits the application of plastic composites to decks, stair treads, handrails, and guards. Thus, the exception would not be an option for you.

thanks Ron!