Joe i think your image is specifically for colorplus where they don t recommend caulking.
Caulking hardieplank siding.
Siding nails should not be caulked another item that needs room to play is siding boards themselves.
Also avoid caulking tongue and groove siding boards together.
Metal flashing or any metal to wood joint should not be caulked another water exit pathway that should never be sealed.
When james hardie siding products butt into wood based materials a 1 8 gap will allow for expansion and contraction of the wood based product.
This from installation instructions.
Caulking around windows doors eaves and trim edges gives added insurance that leaks will not occur.
Osi quad product brochure.
The nails holding up the siding should not be caulked.
Hardiplank and other brands of cement siding are among the most durable of all siding materials.
For regular hardiplank lap siding the kind you paint after installation caulking at butt joints is optional.
Typically made of a high density combination of cellulose fiber cement and sand fiber cement siding is tough termite resistant water resistant and non combustible.
Wherever hardie siding meets a trim board the company recommends you leave a 1 8 gap between the siding and the trim and apply a 3 8 bead of approved caulking to protect and seal the edge of the siding.
Because almost all of the james hardie product installed in edmonton is prefinished colorplus siding the caulking will.
Osi quad caulk for exterior door window and siding applications color matched to james hardie colors uv water resistant will not crack or yellow 1 tube covers 29 lineal feet at 1 4 bead width or 13 lineal feet at a 3 8 bead width paintable.
Hardie board siding runs about 0 70 to 5 25 per square foot this could lead to a total cost of anywhere from 4 700 to 13 300 why such a huge flux in the price range.