|
What metal is best for these decorative rain-catchers?
Silver:
would be great, but far too expensive of course, so we have not had any
inquiries for a sterling silver custom sheet metal work, but I'm sure it could be done.
Lead:
is a thick soft easy to work with metal that can be cut with just a pair of scissors and
shaped with bare hands. It can be custom shaped right on the roof
peak without any special tools, so most building contractors like this option
best. It is so heavy it does not even need to be nailed down to the roof.
It will last and seal up the roof just fine, but it does not leave much in the way of decorative
options and is not very useful for this sort of application.
Copper:
is clearly the best option here. It is a metal that is meant to be seen. It will tarnish within a few months to a
satin dark brown. It
actually takes nearly half a century to turn that chalky green. This dark
earth-tone look makes copper a lot more appealing to most people. It will also stay clean, since it will not mildew. It will also retard the
growth of moss on the roofing below it.
The cost difference of cheaper metals is marginal with this sort of custom work, since
it is typically only 10% of the cost for custom fabrication. To help
minimize cost; the standard in the industry is 12oz and 16oz copper. The thicker
20oz copper we only use for custom work is very good for archival quality to
last for well over a century, unlike the old scupper shown above. It is
sturdier, which is more dent resistant as well.
Copper also makes a great ridge cap for
any roofing in areas that suffer from moss growth and would keep the top edge of
the roof sealed better than the roofing shingles.
Warning:
Other sheet-metal shops may say it is
copper, but it usually is only a very thin sheet copper, or worse: only copper plated
steel.
Solid copper will not attract a magnet, so it is easy to test for this, but it
may be too late by the time to have it to test. Copper
thickness is different that steel gauges. It goes by weight
per square foot. If they say it is 24 gauge, that may mean it is only copper
plated steel, and still very thin. The 20oz copper we use is about twice that
thick.
Stainless steel:
is a good strong metal that will last, but it remains that shinny mirror-like
finish until it mildews. Since it is about the same cost of copper, with
out any anti-fungal properties, it is rarely requested,
but strongly pushed by other sheet-metal shops for reasons listed below.
Warning: Other shops will push
stainless steel like it was the best thing on Earth.
Especially for chimney caps. That is because stainless steel is quick to
fabricate, since it can be simply spot welded together.
They also do not need to worry about finger print oils making the metal surface
tarnish irregularly. You need to beware: they will talk about stainless
steel, but actually substitute with galvanized steel to unsuspecting consumers,
since that client will not see it start to
rust for about a decade. Well past most warranties. Or parts of it will be galvanized steel like the
screen or the bolts. You can test this with a magnet. Good stainless steel
will not attract a magnet.
Aluminum:
can be used, but it is normally painted to make it less brash looking than
galvanized steel or stainless steel. It has a good baked on enamel finish, but
that still only has a 20 year or so life span for that paint. It will still hold
water for many decades later, but it would look poor. It would
probably cost more to have it stripped down and repainted than to have a new cap made. It
will also mildew in areas like the NW here.
So because of these issues; we do not have many clients even ask about
this option.
Galvalum:
is better than galvanized steel, but again it is not worth the small savings
difference of copper,
so we do not even offer it as an option.
Steel: is a cheap and strong
metal, but it will rust through far too soon to be practical and cause rust
stains below if not replace before this happens.
Besides, the savings to you is marginal, since most of the cost of custom work
like this is the labor and shipping. It would save you less than 10% off the
cost of using the thicker 20oz copper we use, so we do not even offer it. |