Galvanized Fasteners & Treated Lumber
Galvanized Fasteners & Treated Lumber
(OP)
Is there a problem with using galvanized fasteners with pressure treated Douglas fir/Larch?
I designed an open portico structure - it's part of a streetscape. The portico consists of a pitched roof with timber rafters, and timber beams along the eaves. There are four concrete/stone columns along each side. The ridgebeam is a galvanized tube, since it had to span 40' without interior supports. The rafter collar ties are galvanized steel straps.
At the last minute the architect says no galvanized fasteners. it will stain the wood. If the fasteners are going to stain the wood one would think the galvanized members will do the same to it. I'm looking for opinions before I start revising the drawings.
Thanks and Happy Thanksgiving.
I designed an open portico structure - it's part of a streetscape. The portico consists of a pitched roof with timber rafters, and timber beams along the eaves. There are four concrete/stone columns along each side. The ridgebeam is a galvanized tube, since it had to span 40' without interior supports. The rafter collar ties are galvanized steel straps.
At the last minute the architect says no galvanized fasteners. it will stain the wood. If the fasteners are going to stain the wood one would think the galvanized members will do the same to it. I'm looking for opinions before I start revising the drawings.
Thanks and Happy Thanksgiving.





RE: Galvanized Fasteners & Treated Lumber
Simpson has as good a summary of this entire question as I have seen anywhere:
http://www.strongtie.com/productuse/ptwoodfaqs.htm...
Happy Thanksgiving to you, too!
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RE: Galvanized Fasteners & Treated Lumber
In fact the code here in canada is all treated lumber must have some form of protected fastener used.
RE: Galvanized Fasteners & Treated Lumber
We call for fasteners to be HDG per ASTM A153. I have a feeling the PM will change everything to SS to avoid an argument with the architect. Of course, that leads to another potential problem: Stainless steel fasteners in galvanized steel connection angles.
RE: Galvanized Fasteners & Treated Lumber
See this link:
http://www.galvanizeit.org/images/uploads/drGalv/S...
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RE: Galvanized Fasteners & Treated Lumber
Mike McCann, PE, SE (WA)
RE: Galvanized Fasteners & Treated Lumber
Mike - here's the problem with spec'ing gold fasteners: It'll take the architect a year and a day to decide if they should be white gold, yellow gold, or tri-colored gold.