Corregated roof for an irrigation system? Hot Spots?

I am building tables... really nothing too complex. Just gonna put some corrugated roofing on top of some wood, have it at a slight slant so the water drips down the roofing, and into a gutter system. The roofing that I got is metal, and I was told at the store it won't create hot spots but I just don't see how that's possible and I'm thinking I may have made a mistake. It's metal, so how could it not create hot spots? Anyone use it? I know people do but I'm trying to avoid putting anything into my garden that puts me even remotely at risk. Thanks in advance.

It's going to be wet. Water absorbs and dissipates heat. Anyway, I'm confused how it would create hot spots since it is going to be shaded by plants?
Spray paint it with one of those expensive auto-body primers so it doesn't rust, be certain to use rubber gaskets around any screw holes, and RINSE it well (primer) before use.

Good call about the rubber gaskets and the auto body primer. I'm going to look into how expensive it will be to do all that, and then make a cost benefit analysis as to weather or not I should just stop being stubborn and buy the damn 4X4 tables from the store - they are only about a bill each but hey money is money.

buy the plastic tubs.... :D
get a couple smaller ones instead of a 4x4 though- 2x4 fits in the back seat of your average car. 4x4 does NOT.
I have actually a 1x4 for my veg closet and LOVE it. I like knowing that if I have to break down, all my equipment is small and can be bagged, boxed, stuffed, packed, and driven to a storage unit with a minimum of exposure.
Build your own tables for the tubs though. A few 2x4s and some sheetrock screws and yuou're in business.

you can also buy corrugated roofing sheets in aluminum ... those will absorb heat rapidly, AND eliminate rust situations ... would be like one great big heat-sink ... :smokin:

Heat sink for sure BUT the heat remains IN the room, so after the inital warming to the temperature of the room, it no longer functions as a heat sink.
I also fear aluminum as a grow-bed construction material, as it still corrodes easily if not treated. I was just on the phone with Dusto talking about sacrificial anodes actually! I believe aluminum is a very common material for these- any plumbers in the house who can confirm that? (To test if you are a plumber, we will also need a picture of your ass)

DOH

I believe you'd be confusing plumbers with sailors, lassy.

We sailors often use zincs to control corrosion/electolysis.

We plumbers, on the other hand, use anti-electolysis fittings to avoid corrosion/electrolysis.

... and you don't want to see my ass. Trust me on that one. :D

PC :stoned:

Well post a pic and we will have a poll to see if you are a sailor (nice ass clad in tacky khakis) or a plumber (funny ass clad not very well in old Carhartts).

I was always under the impression that zinc was more resistant to corrosion than other soft metals, and that teh anti-electrolysis fittings are made of a very corrosion- PRONE material (sacrificial) that will take all the corrosion while the surrounding structural members remain solid.

The most beautiful sailboat I have ever seen had a hull clad in a layer of copper. I know copper corrodes just fine, but I'll bet it was electrified. And it has fantastic anti-fouling properties.

Well, in plumbing you avoid corrosion, period. Anti-electolysis fittings are actually insulators that "break the circuit", if you will, of bi-metal conductivity as well as physically preventing the metals from contacting (touching) each other.

Copper is toxic to most marine life that would try to attach itself to a hull, and is frequently used in anti-fouling paint. But a whole copper bottom, that's a labor of love to maintain. The boat must have been gorgeous. :thumbsup:

Zinc is the preferred metal among sailors. Look at boat ads and you'll frequently see references to something like, "...zincs changed summer 2007...". The zincs actually get eaten up pretty fast. I guess there has to be a balance between corrosiveness and durability.

PC :stoned:

RazzaPiggy - A thousand pardons for jacking your thread.

I'll shut up now. :D

PC :stoned: