Vinyl is my skirting choice for a few reasons. I do not like adding wood framing under the rim or floor joists. This can damage your skirting and home, especially in areas with frost heave or tree roots. The top track of the vinyl skirting allows a lot of movement. Critters can dig under wood framed skirting as easily as vinyl skirting. I usually install vinyl skirting onto a pressure treated 2x4 laid flat. I attach it to the ground with 12" spikes, available at most home stores. I make sure the dirt is flat under the 2x4 by digging out humps, usually with a hammer, or just screet the dirt smooth with the 2x4. A nice tip here is to put your 4' or bigger level against the wall on edge, and line up the 2x4 on that outside edge of the level. This will leave room for your ground channel and a nice lip or reveal of the 2x4 in front of the ground channel. The lip looks nice and hides non-straight edges of the 2x4 and small amounts of error. I also will use a 1" spade bit to dig a 1/4" deep hole, and then a 3/8" bit in the center of that hole to pre-drill and countersink the big spikes. The spade bit leaves a pilot hole for the 3/8" bit. Countersinking the spikes allows the ground channel to lay completely flat on the 2x4. I put the spikes approx 2' o.c. Pressure treated wood is made and approved for ground contact.
All siding materials has that 6" from the ground rule, but that just doesn't work with skirting, unless you are on concrete. So all Hardi-Panel and hardboard skirting and it's framing ends up very close to the ground. Using all pressure treated wood for framing and installing the board with the lip on it should help deter termites. The mud seal (board with the lip) keeps the siding from direct ground contact. This board also helps dirt and decorative rocks from caving in the skirting also.
Today is PERFECT!
All information and advice given is for entertainment and informational purposes only. The person doing the work is solely responsible to insure that their work complies with their local building code and OSHA safety regulations.