Hardie Panel Over Exterior Mineral Wool Nailing Question
Hi everyone, I’m trying to design the exterior wall detail for a remodel. I’m starting with one wall that needs to be done now, and will eventually get around to the other three. After getting hooked on the FHB Podcast and subscribing to the magazine I want to use advanced materials but I’m getting stuck on siding nail selection and furring sizing. I wanted my wall structure to be as follows:
2×4 existing wood framing
Zip sheathing (new)
1.5” Rockwool comfortboard
Furring strips attached with HeadLok screws
Hardie Panel 5/16” vertical siding panels for board and batten look
I’ve been reading Hardie’s Technical Bulletins about fastening over non-structural materials and this is where I’m getting confused. A lot of their examples specify 1×4 furring strips but their nail charts for 5/16” panels don’t have a fastener under 1.5” in length. They say the fastener cannot penetrate through the furring so 1×4 is out. I considered ripping strips of Advantech into 4” widths as I’ve seen on Matt Risinger’s Build Show (for the durability/weather resistance and straightness of Advantech vs dimensional lumber) but the thickest Advantech is 1-1/8” so I’m still a 1/16” short of my nail length and they only come in 8’ sheets, my wall height is 10’.
So all that leaves is 2×4 dimensional lumber? Which seems to be lot of additional cost plus I’ll have to worry about weatherproofing it since it’s outside my WRB?
Does anyone have any suggestions for furring selection? My head is spinning going from one Technical Bulletin to another. Would it be possible to layer strips of Advantech and offset the joints to 10’ vertical strips and meet my required thickness? Or am I stuck with using 2×4 furring?
Thanks in advance for any help!