Galvanized Anchor Bolts in Pressure Treated Sill
Galvanized Anchor Bolts in Pressure Treated Sill
(OP)
Found some pretty old discussions on this topic figured I would bring it back to light. IBC, CBC, OSSC all mention the same exception 2304.10.5.1 (CBC)
Exception: Plain carbon steel fasteners, including nuts and washers, in SBX/DOT and zinc borate preservative-treated wood in an interior, dry environment shall be permitted.
To me exterior walls are technically in a dry environment. Simpson strong tie also elaborates on this answering the question;
"I have preservative treated mudsills. Should I be using stainless steel anchor bolts? What about hot-dip galvanized?
The mudsill is a location that is considered dry in comparison to a deck, for example. For wood that is installed and remains dry, the corrosion potential will be comparatively low. Regarding code issues, section R317.3.1 of the International Residential Code (IRC) addresses fasteners for pressure-, preservative-, and fire-retardant-treated wood; Bolts of ½" and greater do not need to be hot-dip galvanized steel, stainless steel, silicon bronze or copper"
I have always used 5/8" diam anchor bolts which is exempt per the residential code but of course you have to design for either code. Can't really pick and choose which requirements you want to follow.
What are your guys thoughts on this? I think for a typical residential house mudsills are in dry environment, not exposed to weather like a deck and therefore do not need galvanized anchors. However, from reading previous posts that is not seem to be the consensus.
Exception: Plain carbon steel fasteners, including nuts and washers, in SBX/DOT and zinc borate preservative-treated wood in an interior, dry environment shall be permitted.
To me exterior walls are technically in a dry environment. Simpson strong tie also elaborates on this answering the question;
"I have preservative treated mudsills. Should I be using stainless steel anchor bolts? What about hot-dip galvanized?
The mudsill is a location that is considered dry in comparison to a deck, for example. For wood that is installed and remains dry, the corrosion potential will be comparatively low. Regarding code issues, section R317.3.1 of the International Residential Code (IRC) addresses fasteners for pressure-, preservative-, and fire-retardant-treated wood; Bolts of ½" and greater do not need to be hot-dip galvanized steel, stainless steel, silicon bronze or copper"
I have always used 5/8" diam anchor bolts which is exempt per the residential code but of course you have to design for either code. Can't really pick and choose which requirements you want to follow.
What are your guys thoughts on this? I think for a typical residential house mudsills are in dry environment, not exposed to weather like a deck and therefore do not need galvanized anchors. However, from reading previous posts that is not seem to be the consensus.





RE: Galvanized Anchor Bolts in Pressure Treated Sill
RE: Galvanized Anchor Bolts in Pressure Treated Sill
If you are a one or two family dwelling - you would have to use the IRC. Otherwise you'd be under the IBC.
Not sure why you think you have to design to both.
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RE: Galvanized Anchor Bolts in Pressure Treated Sill
I was saying the opposite, you either have to use one or the other like you said, not both.
RE: Galvanized Anchor Bolts in Pressure Treated Sill
Are you designing a one or two-family residence?
For a particular project you use one or the other not both....unless there is a singular element in the IRC-type project where engineering is required (beyond the IRC prescriptions)...which doesn't appear to be the case for your question.
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RE: Galvanized Anchor Bolts in Pressure Treated Sill
Exception: Plain carbon steel fasteners, including nuts and washers, in SBX/DOT and zinc borate preservative-treated wood in an interior, dry environment shall be permitted.
RE: Galvanized Anchor Bolts in Pressure Treated Sill
I'm not an expert in the different types (perhaps others here can chime in?).
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RE: Galvanized Anchor Bolts in Pressure Treated Sill
Dik
RE: Galvanized Anchor Bolts in Pressure Treated Sill
So, majority wise, does everyone pretty much spec out galv. anchors then?
RE: Galvanized Anchor Bolts in Pressure Treated Sill
RE: Galvanized Anchor Bolts in Pressure Treated Sill
The IRC is less restrictive than the IBC. You can always use IBC provisions in lieu of the IRC.
I always spec'd the IBC and never had any problems.
Mike McCann, PE, SE (WA)