I've found nothing in any manual or anywhere online to address this. Installation instructions just say "attach wall bracket to wall securely." Uh, ok, thanks.
Planning to install chimney through wall and up side of house. SS chimney wall brackets must be installed every 8' to secure chimney to exterior house wall. Problem: wall is aluminum siding over 1/2" fiberboard (built mid 60's), fiberboard is nailed to wall joists. Unlike plywood I do not trust fiberboard to hold any nail or screw; this stuff is basically compressed cardboard. Also, chimney might need >2" from wall to get around roof edge. The farther away chimney is from wall the more stress on wall attachment points. Also, chimney isn't centered between wall joists (comes thru cinder block wall downstairs).
Note: the chimney will be secured at the following points:
on a tee support at bottom,
at this wall bracket in question,
at another wall bracket at roof level,
and finally a roof brace.
Total chimney height is 20'. These other attachment points will be secured to wood or concrete and are not a problem.
a) Alternatives to screws/nails, like toggle bolts or anchors? They would be ok thru wood or drywall but again this fiberboard is pretty flimsy--are there such anchors designed for fiberboard specifically? And even if this is secure how secure are the nails holding the fiberboard itself to the joists? I don't want a 60mph wind pulling the chimney, bracket, siding, and fiberboard off the joists. Unlikely, perhaps, but I want to be sure.
b) Attaching a piece of 2x4 against siding with lag bolts into wall joists, then attaching bracket to the 2x4. But I'm concerned about moisture and wood rot.
I'd love to hear your ideas.