Sill Anchors
Sill Anchors
(OP)
Is there was a requirement, in IBC, stating that when fastening preservative treated wood sills to concrete foundation, the anchors must be of corrosion-resistant material such as galvanizing or stainless? I thought there was and I cannot find it.
Thank you...
Thank you...






RE: Sill Anchors
www.SlideRuleEra.net
RE: Sill Anchors
Through research, I have spoken to the key structural code reviewers for the state of Wisconsin, who, though they may agree that the 1/2" anchors may be effective, the IBC simply states as stated in 2304.9.5.
I'd love to join the crowd, but code will not permit. Does anyone know of any way, that I might be over-looking, that might permit me to specify 1/2" anchors? What does AF&PA Technical Report No. 7 say?
RE: Sill Anchors
R319.3 Fasteners. Fasteners for pressure preservative and
fire-retardant-treated wood shall be of hot-dipped galvanized
steel, stainless steel, silicon bronze or copper.
Exception: One-half-inch (12.7 mm) diameter or greater
steel bolts.
Depending on your state code, if applicable, the IRC covers 1 and 2 family dwellings and you can use it for 3+ family dwellings as a design option.
In Ohio, the IRC covers 1, 2 and 3 family and 4+ family in use group R-3 and the codes are mostly based on the 2003 I-codes.
Don Phillips
http://worthingtonengineering.com
RE: Sill Anchors
Thank you...
RE: Sill Anchors
Corrosion does not care what the code says or does not say...
RE: Sill Anchors
I would not recommend using non-corrosive resistent fasteners for attachment to ACQ treated wood. Based on some of the stories I've heard I would not be surprised that at some time in the future the 1/2" bolt exception is eliminated.
RE: Sill Anchors
1) do not used treated wood. If the sill is high enough above grade, treated wood may not be required. Or use another method of foundation achorage.
2) use a borate treated wood for the sill. I understand this is not corrosive to steel fasteners but is not rated for exterior exposure. Should be OK for a foundatio anchor.
3) use a wood that is naturally resistant to decay and termites like cedars and other woods listed in the code.
4) use a stainless steel anchor.
Don Phillips
http://worthingtonengineering.com
RE: Sill Anchors
DonPhillips...if the wood is in contact with concrete, it should be treated, without regard to its other exposure. The perimeter sill is an exterior condition...I wouldn't use borate treated wood there.
RE: Sill Anchors
Don Phillips
http://worthingtonengineering.com
RE: Sill Anchors
http://www.ufpi.com/product/ptlumber/fasteners.htm
Two local fastener suppliers are telling me that the are getting complaints of coated fasteners having problems in outdoor applications especially near the water. Also galvanized fasteners are given problems on docks and piers. The Galvanize problem might stem from some of the lower quality fasteners in the market. Good quality HDG galvanized fasteners are expensive, probably twice the cost merchant grade.
For residential including multifamily dwellings CS is the still the predominant anchor bolt material.