Reply With QuoteYes, that dude is truly awe inspiring.
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Coolest recycling (and solar) use I have seen to date!
Excellence is an art won by training and habituation. We do not act rightly because we have virtue or excellence, but rather we have those because we have acted rightly. We are what we repeatedly do. Excellence, then, is not an act but a habit.
- -- Aristotle
Believe nothing on the faith of traditions, even though they have been held in honor for many generations and in diverse places. Do not believe a thing because many people speak of it. Do not believe on the faith of the sages of the past. Do not believe what you yourself have imagined, persuading yourself that a God inspires you. Believe nothing on the sole authority of your masters and priests. After examination, believe what you yourself have tested and found to be reasonable, and conform your conduct thereto.
- -- The Buddha
It is the mark of an educated mind to be able to entertain a thought without accepting it.
- -- Aristotle
Mjölner
Yes, that dude is truly awe inspiring.
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Sweet Jane
Hey Po, nice video. Pinoys are a very environmentally conscience people. I helped the mayor and my brother in-law set up a MuRF in my wifes home town in Pangasinan, Luzon. I was amazed at the caliber of work they accomplished with out a whole lot of recources. Sure cleaned up the community too. Now all the Lola's and children keep a sharp eye out for any metal, plastic containers, paper,etc, for the peso or two they can get for depositing it at the MuRF.Originally Posted by Damocles
Now if they could just learn about birth control.
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Loyal to the end
Excellent idea. But what's the purpose of the metal square? Just cut the circular hole in the roof itself.
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Until the sealant dries and secures it to the "metal square", the weight of the water would pull the bottle through the roof. This also allows them to make them before hand, especially when the weathers bad.
Why do we put a "metal square" around roof vents, for the sewer drains?
Why not just cut a hole through the roof and seal it?
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Mjölner
Don't expect too much from him Free, he is an engineer, not versed in "flanges".
It is the responsibility of every American citizen to own a modern military rifle.
Loyal to the end
The sealant doesn't hold the weight of the bottle. If you notice when they cut the hole for the bottle, they bend the edges slightly up. They then push the bottle up from below and it compresses slightly to squeeze into the hole. You couldn't pull that bottle back down without shredding it.
In the US on a corrugated roof we use a round or oval rubber boot for a vent pipe.
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Which is what would occur, if they didn't allow the sealent to cure completely; which goes back to my comment of being able to make these prior to instulation.
Last time I was at the Home Depot or Low's, the US still uses roof vents with metal flanges; which are generally square in shape and have a round opening for the vent pipe to go through.
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Loyal to the end
Again, the sealant doesn't hold the weight of the bottle. Big box retailers typically don't stock roof accessories for corrugated roofing. Most residential roofing in the US is three tab fiberglass shingle, and those use pipe boots with rectangular bases.
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Flanging adds strength to the roof where you have put a hole through it and provides a better and larger surface for sealing allowing more sealant to be used where the water will be flowing during inclement weather and providing a better seal. It also allows the mini skylight to be created and installed on houses en masse.
There is a reason we use flanges in the US when we poke a hole through the roof, even though we could just add sealant to the hole.
Excellence is an art won by training and habituation. We do not act rightly because we have virtue or excellence, but rather we have those because we have acted rightly. We are what we repeatedly do. Excellence, then, is not an act but a habit.
- -- Aristotle
Believe nothing on the faith of traditions, even though they have been held in honor for many generations and in diverse places. Do not believe a thing because many people speak of it. Do not believe on the faith of the sages of the past. Do not believe what you yourself have imagined, persuading yourself that a God inspires you. Believe nothing on the sole authority of your masters and priests. After examination, believe what you yourself have tested and found to be reasonable, and conform your conduct thereto.
- -- The Buddha
It is the mark of an educated mind to be able to entertain a thought without accepting it.
- -- Aristotle
Rune (12-22-2011)
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I never said the sealant held the bottle.
What I said is that the weight would pull through the sealant, if is was just put on the roof and the water added.
And
I never said it was for corregated roofing. What I said was that the majority of them were made of metal.
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Mjölner
Try watching the video again. The intricate work of cutting a precise hole which fits the bottle tightly is performed on the flange...it would be very difficult to cut such a precise hole in the roof with a home made cold chisel and two rocks. It is the hole in the flange which holds the bottle tightly, the hole in the roof is a jagged oversized hole. Furthermore everything Damo said is true as well.
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Loyal to the end
When you seal a hole your goal is to have the least length of seam possible. The plate (you and Dune call it a flange) simply adds to the length of the seal, since the roof to bottle joint is still there. Say a bottle is 3" diameter and the plate is 8" square. In the hole only scenario the length of seam is 3*pi. In the plate scenario the length is 3*pi+4*8, over 4 times longer.
You also have more length of metal to cut, and likely screws from the plate to the roof, therefore your labor is higher as well.
Loyal to the end
The water in a one-liter bottle weighs about two pounds. That's not enough to pull down through a joint like that. I don't think you could pull that bottle through without ripping it apart, and that's without sealant.
Corrugated roofing is what is used in this application. These roofs are relatively flat, perhaps a 1" rise in one foot. Fiberglass shingle roofs need at least 4 on 12 to drain properly and keep the wood substrate below from rotting.
Loyal to the end
The video mentioned "electric bill". In fact the whole idea is to save electricity costs for daytime lighting. So power tools should be available. Even so, you don't cut sheet metal roofing with a cold chisel, which is usually 23 gauge here but may be as thick as 20 gauge in this application. You make a starter hole with a hand drill then cut an accurate circular hole with tin snips.
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