If termite shields are galvanized and they go over the block and a PT plate goes on top of the shield, why is it if you read a roll of galvanized valley material it say “Not to be used with pressure treated wood” ???
Should galvanized be in contact with PT??
I’m confused
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WWPD
Built from locally sawn hemlock, this functional outdoor feature uses structural screws and metal connectors for fast, sturdy construction.
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Replies
Bump.
Weve always used alum and thats all Ive ever seen but I dont know anything . Im not up on the new chemicals either. So maybe we will get educated here. <G>
Tim
It's sketchy, I did one recently 100 yds. off the ocean. I used stainless anchor bolts and put Grace Vycor (Normally used as self adhesive window flashing) between the PT and the termite shield. Did I throw away $600. It is cheap insurance I think. I don't know about ACQ. I have walked many jobs where "paper contractors" have PT ACQ columns wrapped in OSB and wood frames with ACQ bottom plate and cut nails (OUCH) This is going to be a huge problem in a few years.
I had Grant bend me some copper to cap the block wall top. I jacked up the house and sawzalled off the anchor bolts so I could replace the sill plate and band. I tapconned into the filled core where the old bolts were.
I am pretty certain 16 oz copper will survive.
I wouldnt even consider alum. as a fix w/PT. Or galv. But that is me.
Spheramid Enterprises Architectural Woodworks
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The Big Box here sells copper rolls as termite shields.
Galv and aluminum were fine with the old CCA PT, but NG with the new ACQ. The options now are either copper (expensive), or a synthetic material like Vycor. Resource Conservation Technology has a "building gasket" extrusion that looks like the Rolls Royce way to go.
Resource Conservation Technology Inc
2633 N Calvert Street
Baltimore MD 21218
USA
telephone: 410-366-1146
telefax: 410-366-1202
The shield isn't so much to stop the termites themselves as it's to stop moisture from wicking up into the wood and making it better termite food.
-- J.S.
How does a termite shield work? Don't they just crawl around the corner?
"When asked if you can do something, tell'em "Why certainly I can", then get busy and find a way to do it." T. Roosevelt
> How does a termite shield work? Don't they just crawl around the corner?
Subterranian termites would build mud tubes bypassing the shield, drywood termites just fly past it and establish new colonies. The shield doesn't stop the bugs. Its real purpose is to block moisture from the concrete from wicking up into the wood. All termites, even so-called "drywood", need a moderate amount of water in the wood they eat. Keeping the wood dry helps a lot to slow them down.
-- J.S.
Termite Shields
I've had termites. No termite shields on the house. I saw the telltale mud tube. Termites used to be rare here in Massachusetts but the exterminator said they're moving northward. If there is a termite shield how do the termites navigate it. Under or around it? Also, can a termite shield be easily retrofitted?
Drywood can just fly, they find an opening to the wood and they are in it.
However there is the "new" termite (formosa) that will eat the concrete if needed.
Can't stop those with galvanized
Oh, well crap copper would be waaaaaaaaaaay expensive. Imagine 150' x 10" of copper shield!!!!!!!!!
There has to be an alternative???
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WWPD
Edited 1/26/2006 6:53 pm ET by Sailfish
the metal is suppose to stop them from traveling up the interior core of the block.
flashing and pt
Aluminum flashing, and galvanized steel corrode in contact with ACQ (amine copper quarternary). However, over the last two years, most pt is now treated with MCA (micronized copper azole) which is fine to use with either metal. Older treatments like CCA (chromated copper arsenate) or Wolmanization (Arsenic) are also fine for use with alum or galv.
Ancient post but a sill seal is used between the termite shield and the sill, with the seal there would be no contact between the wood and metal.