Coolest recycling (and solar) use I have seen to date!
- Thread starter Damocles
- Start date
Mott the Hoople
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.
Now if they could just learn about birth control.
DamnYankee
Loyal to the end
Excellent idea. But what's the purpose of the metal square? Just cut the circular hole in the roof itself.
USFREEDOM911
MAKE AMERICA GREAT AGAIN
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?
Don't expect too much from him Free, he is an engineer, not versed in "flanges".
DamnYankee
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.
USFREEDOM911
MAKE AMERICA GREAT AGAIN
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.
DamnYankee
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.
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.
USFREEDOM911
MAKE AMERICA GREAT AGAIN
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.
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.
DamnYankee
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.
DamnYankee
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.
DamnYankee
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.
Mott the Hoople
Sweet Jane
Flanges or no flanges. The point is, it's an ingenious method for people with low incomes in this region to save on energy cost. There may certainly be better ways to skin this cat but that doesn't take away from the concept at all. I love this kind of thinking.
DamnYankee
Loyal to the end
Just looking for ways to make it even better cheaper faster Moot. You libs are so resistant to that.
If you really want to help, send the guy a set of decent holesaws and a variable speed drill motor. Then he can install 50 of these things a day and not need flanges.
DamnYankee
Loyal to the end
Since I give to Food for the Poor, I probably already have.
Incorrect. When you must use seal, increasing the width of the barrier increases your chances of successful seal. Sealing solely at the seam is the place with the largest failure rate. In short, there is a reason high pressure seals increase the surface of the seal using templates. O-rings are designed to spread, to increase the surface of the seal... on and on. You have a higher success rate if you can extend the surface with whatever you are using as a seal.