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Gold/Mining/Energy : Copper - analysis -- Ignore unavailable to you. Want to Upgrade?

To: russet who wrote (354)	9/7/2001 2:49:08 PM
From: marcos	Respond to of 2131

In concrete it is the difference in coefficient of expansion/contraction that presents a problem with copper, i believe ... especially in slab heating, i hear they have a special plastic for this now .... construction not my forte, though ... i put copper in this house, sweated in every joint myself, and i'll put it in the next, works fine, never had any trouble with it A copper roof is a joy to behold, that lovely shade of green in the oxidised layer, really sets off the old CPR hotels and parliament buildings etc .... i'd like to know what thickness they use, to compute the cost per square metre ... probably not so much, likely, especially amortised over its lifetime and compared to the lifetime of alternatives ... ??

To: russet who wrote (354)	9/7/2001 2:53:20 PM
From: Robert Douglas	Respond to of 2131

I believe the problem with copper in concrete has to do with the steel reinforcement. Hence the use of plastic for radiant floors. www2.worldofconcrete.com

To: russet who wrote (354)	9/7/2001 3:16:39 PM
From: Robert Douglas	Read Replies (3) \| Respond to of 2131

Copper pitting. jlcnet.com Excerpts: "The copper pipes get green spots, and then they just start dripping," says Hoffman. "We’ve had to repair pipes in hundreds of houses. In a lot of houses that are less than ten years old, we have had to replace all the pipes in the house. …corroding copper tubing has recently been reported in cities as far apart as Phoenix, Ariz. and Andover, Mass. Other cities reporting problems with pinhole leaks in copper include Saugus, Calif., Lima, Ohio, and Jacksonville, Fla. In Jacksonville, the problems were so serious that the city, in an unprecedented step, banned the use of copper for residential water supply piping. Jim Edwards, an estimator with W. J. Maloney Plumbing Co. in Phoenix, has had first-hand experience with copper corrosion. A leak in the copper tubing under the slab in Edwards’ own home cost $7,800 to dig up and repair, and he believes that aggressive soil was responsible. "If the house happens to be in a certain area, the pipe will just eat away," said Edwards, who reports that problem soil is found throughout Maricopa County in Arizona. Garry Gage, owner of Garry Gage Plumbing in Rialto, Calif., has seen many failures of buried copper tubing in his region, so he takes a conservative approach. "When doing new construction, my company won’t put copper pipes in the ground," says Gage.