danski0224
Well-known member
I'm in agreement with the minutae bit.
The request for stainless fasteners is a bit of a stretch too. SS is weaker than zinc coated steel. Plus the act of sinking the bolt into the metal creates the rot in the wood. I've seen standard zinc bolts used on porches and decks here where it snows on them directly and the wood nor the fastener have failed over 20 or so years out doors.
The pieces of wood in the brackets certainly look like pressure treated lumber. The color of the horizontal 2 x bracing is clearly lighter than the vertical framing members.
The chemical formulation of pressure treated lumber has changed.
The stuff you see today that is "20 years old" is the old formula. It worked fine, but it had arsenic in it. This was thought to be a problem. The old pressure treated stuff did not aggressively attack ferrous hardware or aluminum.
The "new and improved" ACQ stuff is not nice.
It will destroy improper fasteners quickly.
ACQ lumber that gets wet (ie: decks) is worse because the water leaches the chemicals out, and cheaply built decks lacking attention to detail will retain water.
ACQ lumber in this application is still plenty wet off the shelf.
Plain shiny zinc fasteners (bolts, screws, nails and structural brackets) have zero resistance to ACQ lumber.
"Double hot dipped" galvanized is a little better.
Plastic coated is next.
Stainless is best.
Proper fasteners in ACQ lumber has nothing to do with strength, it is chemical resistance.
There is plenty of info about ACQ fastener problems on the web. I would suggest reading up about it before mentioning more anecdotes about "20 year old fasteners that are just fine". That kind of bad information is criminal from someone in a location with numerous multi-story porches and fire exits built out of treated lumber by low bidders. You can't judge the condition of the fastener by looking at the part that remains outside of the wood.
Granted, this is not a deck build and the posts should stay dry.
Given the expense and lack of detail thus far (no J bolts tied to the rebar concrete reinforcement for post bracket attachment in a "$90k" concrete job), the proper stainless steel brackets and hardware should be used.
This isn't a deck with a projected lifespan of ~20 years that can be replaced.
Money should be diverted from the fluff part of the project (interior finishes and fixtures) to ensure that the structure and mechanicals are sound.
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