Brian Knight wrote:Thats a very cool roof Abe. Any ideas on lbs per sqft? Not sure where you live Barn Kat but it might be wise to do some roof load calcs depending on your framing and worst case snow loads.
Ferrocement, like concrete, will need maintenance and repair as cracks appear. It is important to ensure that the ferrocement mix does not contain any toxic components.
Then again, we have spring water. I can see redirecting water for use around the property, but collecting rain water for drinking, well I wish the air was that clean.
Be very very careful with concrete or anything not intended for the purpose of using it. Without doing a lot of research, you don't know what was mixed in the concrete, and they aren't concerned about you drinking water which runs across it, since that wasn't its intended purpose. There is an incredible variation in concrete - be safe.
It might be okay, but without an analysis of it, you probably don't know.
The cement industry is one of two primary producers of carbon dioxide, a major greenhouse gas.
Cement manufacturing releases CO2 in the atmosphere both directly when calcium carbonate is heated,
producing lime and carbon dioxide,and also indirectly through the use of energy if its
production involves the emission of CO2.
The cement industry produces about 5% of global man-made CO2 emissions, of which 50% is from the
chemical process, and 40% from burning fuel. The amount of CO2 emitted by the cement industry is nearly
900 kg of CO2 for every 1000 kg of cement produced.
In some circumstances, mainly depending on the origin and the composition of the raw materials used, the
high-temperature calcination process of limestone and clay minerals can release in the atmosphere gases and
dust rich in volatile heavy metals, a.o, thallium,cadmium and mercury are the most toxic.
Heavy metals (Tl, Cd, Hg, ...) are often found as trace elements in common metal sulfides (pyrite (FeS2),
zinc blende (ZnS), galena (PbS), ...) present as secondary minerals in most of the raw materials.
Environmental regulations exist in many countries to limit these emissions. As of 2011in the United States,
cement kilns are "legally allowed to pump more toxins into the air than are hazardous-waste incinerators.
But the issue of contaminants has been raised. It really is an issue, as many birds and other animals carry salmonella and various other diseases. At the very least, I'd get a first-flush diverter and avoid trees overhanging the house.
Rusty Bowman wrote:Doh! I totally spaced this but besides "Water From The Sky" by Michael Reynolds, I'd recommend adding Art Ludwigs "Water Storage" to your reading/research list. Between these two books, you can tap into a combined 50 or more years of first-hand experience in the very things being talked about here.
Ernie Wisner wrote:I dont know i do know that almost all brick manufactures produce a limited number of roof tiles.
Ernie Wisner wrote:you could make the tiles yourself since they are only low fired a cob oven would do fine. you culd get whatever pattern you wanted for example by doing raku.
Ernie Wisner wrote:I think the material components of cement, the making, and the hauling those bags around might make it a touch spendy. I dont know for a fact, do you have any data on the cost of the whole production run of cement from the mine to the cast? I would love to see the numbers.
Not necessarily. Low-quality tiles (or substructure) that must be replaced within 50 years, and/or were shipped very far would definitely have a larger impact than regionally-produced cement. You save energy on the temperatures/heat of firing tiles, but not in the transport and durability.
However, tiles are much cleaner/greener in production and use than cement any day.
Ernie Wisner wrote:Abe one thing i do know is tiles are made with ball clay and unless someone is sitting in the middle of a bentonite patch mixing some sand in will make stable tiles. if you only have bentonite then you mix in enough gravel fines and you got a good tile it just takes testing.
that's a heavy roof when it is wet. Make sure you have a good structure supporting 5 inches of wet soil. Do you have some links of a roof like this? I would love to see a moss roof, that would be beautiful.
Ernie Wisner wrote:of course you could make a living roof and plant moss on it so your water is filtered before it gets to you. thats just cardboard covered in visqueen and 2 to 5 inches of dirt.
Ernie Wisner wrote:if i was to build a cement roof i would go with roman cement. probably use hydraulic lime to ensure the roof would hold water properly. I am not sure on the weight what would work better roman cement or clay tiles
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