What Are Skirt Boards?
Skirt boards is not a well known term. Exactly what they are is the larger trim board that runs next to the stairs. Some houses have them and some don't. If you ask for
skirt boards at your local lumber store they should know what you are talking about. Most of the time these boards are made out of pressed wood and have a raw veneer type finish on them which could be a variety of types of wood such as but not limited to oak, maple, pine, and others. They are tricky to install if you don't know what you are doing and mistakes can be made very easily. Something you don't want to make as these boards are quite costly.
Thats why I am in the process of creating an e-book just for installation of these boards and it will be simple to follow. It just takes a few tools and it is very quick once you know the process. Look for this e-book soon.
Different Styles
Just like the baseboard or casing available in different styles so are these boards. There is a sort of ranch style and a colonial or princeton style. Most of the time these manufactured boards are a predetermined width of about 9 1/2 inches and you order the lenghth you need and they usually come in even numbered lenghths like 8, 10, 12, or even longer. If you want to be creative or different I have seen these trim boards custom made also. They can be as fancy as you want them to be although you do have a limited space between the stair treads and wall to work with.