Hello !
I would like to know if a so-called extendable green roof, that is to say little earth (<= 20cm) with vegetation that needs little water which is resistant to winter and drought, So if this roof still allows the recovery of rainwater in reasonable proportions compared to normal roofs.
If in the case of a poor recovery of rainwater, the gain of money gained on the heating of you is worth with that of water gain by the recovery of a normal you?
All these questions are asked for the sake of curiosity, I have nothing to lead a project from the top of my 17 years still in school ^^
Thank you for your answers =)
Squall-n
Green roof allows water recovery?
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minguinhirigue
- Éconologue good!
- posts: 447
- Registration: 01/05/08, 21:30
- Location: Strasbourg
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I didn't quite understand your question.
You seem to mix economy, heating, recovery of rainwater in a big fair ...
An extensive or intensive green roof does not allow rainwater to be collected, it is the additional storage tanks which may or may not perform this function.
However, the earth, the gravels, and the drain which constitute the roof can temporarily retain the water, like a sponge, or the reserve at the bottom of the vase: either the plant which has above uses it, or it flows gently or evaporates ...
The question of the price of these systems or their influence on heating is another matter ...
You seem to mix economy, heating, recovery of rainwater in a big fair ...
An extensive or intensive green roof does not allow rainwater to be collected, it is the additional storage tanks which may or may not perform this function.
However, the earth, the gravels, and the drain which constitute the roof can temporarily retain the water, like a sponge, or the reserve at the bottom of the vase: either the plant which has above uses it, or it flows gently or evaporates ...
The question of the price of these systems or their influence on heating is another matter ...
0 x
Simple answer to identify the problem:
read:
http://fr.wikipedia.org/wiki/Toiture_v%C3%A9g%C3%A9tale
http://fr.ekopedia.org/Toit_vert
Per m2 in the Paris region, approximately 60cm of water falls and therefore per year recovers 0,6m3 or 2 € to 3 € per m "of drinking water from the tap (rain water is far from being approved for drinking, dust, pollution and eb microbes retaining it), to be compared to the price of the roof of 150 to 300 € per m2 and therefore amortized in 50 to 150 years minimum !!!!
'the price is on average 4 to 5 times more expensive than a normal roof. "
The green roof will conserve water better and slowly re-evaporate it instead of letting it flow. According to the assessments, this unexpired proportion varies between 10% (very little vegetation, region with intense Mediterranean storms leading to heavy inodations) and 30 to 50% if large plant reserve in meadows and thick forests)
http://www.persee.fr/web/revues/home/pr ... 219_0000_1
search on google: evaporation forest grass
and therefore you recover most of the rainwater in my opinion to within 30% or per m2 € 2 of water per year (and if with little camel grass not very insulating, to 10% in my opinion ) !!
The gain in insulation for a roof not insulated by peat and layers of soil and plants that are fairly insulating from concrete seems significant, but not with wet earth close enough to concrete in thermal conductivity:
http://fr.ekopedia.org/Conductivit%C3%A9_thermique
but with thick grass and plants that make the air still !!
http://www.lemoniteur.fr/199-materiaux/ ... au-isolant
(once dry !!)
So it is good by making a green roof to insulate it better (10cm of insulation not very expensive) before laying the waterproof film underground.
Finally for more answers use google with the right questions and read all the answers !!!
read:
http://fr.wikipedia.org/wiki/Toiture_v%C3%A9g%C3%A9tale
http://fr.ekopedia.org/Toit_vert
Per m2 in the Paris region, approximately 60cm of water falls and therefore per year recovers 0,6m3 or 2 € to 3 € per m "of drinking water from the tap (rain water is far from being approved for drinking, dust, pollution and eb microbes retaining it), to be compared to the price of the roof of 150 to 300 € per m2 and therefore amortized in 50 to 150 years minimum !!!!
'the price is on average 4 to 5 times more expensive than a normal roof. "
The green roof will conserve water better and slowly re-evaporate it instead of letting it flow. According to the assessments, this unexpired proportion varies between 10% (very little vegetation, region with intense Mediterranean storms leading to heavy inodations) and 30 to 50% if large plant reserve in meadows and thick forests)
http://www.persee.fr/web/revues/home/pr ... 219_0000_1
search on google: evaporation forest grass
and therefore you recover most of the rainwater in my opinion to within 30% or per m2 € 2 of water per year (and if with little camel grass not very insulating, to 10% in my opinion ) !!
The gain in insulation for a roof not insulated by peat and layers of soil and plants that are fairly insulating from concrete seems significant, but not with wet earth close enough to concrete in thermal conductivity:
http://fr.ekopedia.org/Conductivit%C3%A9_thermique
but with thick grass and plants that make the air still !!
http://www.lemoniteur.fr/199-materiaux/ ... au-isolant
(once dry !!)
So it is good by making a green roof to insulate it better (10cm of insulation not very expensive) before laying the waterproof film underground.
Finally for more answers use google with the right questions and read all the answers !!!
0 x
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