metal roof slope and water
metal roof slope and water
(OP)
What's the typical slope for a 6 meter by 6 meter metal roof and 12 meter by 12 meter metal roof?
Is the slope double for area that is twice larger?
Is there a rule of thumb formula for the size of metal roof, how fast water move down it?





RE: metal roof slope and water
RE: metal roof slope and water
RE: metal roof slope and water
RE: metal roof slope and water
RE: metal roof slope and water
http://www.lysaght.com/files/dmfile/RoofingWalling...
RE: metal roof slope and water
If you have a concrete roofdeck and you didn't waterproof it. How long before rains erode the bars inside slab and beams if there are delays in the waterproof or cover? Would rainwater pass thru the concrete and into the bars and cause rust inside or no oxygen, no rust?
RE: metal roof slope and water
RE: metal roof slope and water
RE: metal roof slope and water
How exactly is concrete permeable to water? If you glue a piece of concrete in the middle of a 4" diameter test tube with water on top and seal tight. How long before 10% of the water get through the concrete at uniform diffusion assuming the the concrete is at least 5000 psi and plant mixed?
RE: metal roof slope and water
RE: metal roof slope and water
Concrete is permeable to water because it has interstitial voids and capillarity that will allow moisture/water to migrate into and through concrete. Concrete will hold water without leaking until saturation occurs, then gravity will cause leaks. Leaks can occur before this from condensation collection from the higher moisture content of the concrete.
As hokie66 noted, when there are cracks in the concrete, leaks occur directly and quickly.
RE: metal roof slope and water
Would you know to what extend air can get into the interstitial voids and capillarity and rust the bars inside? Have you actually seen if rusts form in the bars inside bridges or old decks that didn't have waterproof and how rusty it can get?
RE: metal roof slope and water
Saying that i have seen lots of low level crossings that are fully submerged at least once a year and while they are only lightly reinforced i have not seen anythin g working through to the surface. I have seen some concrete harbour works where the rusting steel has caused the concrete to spall. Also i think the concrete cover required for extreme conditions is about 75mm and there are no requirements for waterproofing so i think it is safe to assume that there is a low risk of any major damage