DiscussWorldIssues - Socio-Economic Religion and Political Uncensored Debate - View Single Post - This morning it was 77 degrees outside, but 90 degrees inside

**Khcyhshq** · 06-07-2012, 12:30 AM

Gravilla is the way to go, since adding anything atop the roof will be asking for a sure to come problem when storms come about, pests, mold, thieves, etc...

What do you think they use in large commercial roofs with concrete?

You can leave a small channel (gap line) in some sections that follow the designed concrete's slab drain pattern, in order to have excess water removed when it rains to avoid leaks due to filtration.

The gravilla acts as a natural insulator for the home, both for the cold and hot temperatures. It limits the exchange of the air inside and outside via thermal transfer by trapping air in bubbles that act like mini insulators. When the day time is very hot, the white gravilla reflects most of the solar heat away, and what's left of it after the sun goes down will act as coolers when the gravilla damp their surface due to the cooler air.

Like I said (and is done in commercial roofs) you can wet the roof when it's very hot to create a rapid exchange of temperature from the gravilla and cool the house even more during the hot streaks.

It's highly recommended to AVOID building a new roof line above a concrete slab, because the normal heat exchange is disrupted and will cause mold and other problems to the concrete roof.

Mold accelerates the decay of the salt-oxides in the concrete and also can infiltrate the pores all the way inside the house.

06-07-2012, 12:30 AM	#10
Khcyhshq Join Date Oct 2005 Posts 403 Senior Member	Gravilla is the way to go, since adding anything atop the roof will be asking for a sure to come problem when storms come about, pests, mold, thieves, etc... What do you think they use in large commercial roofs with concrete? You can leave a small channel (gap line) in some sections that follow the designed concrete's slab drain pattern, in order to have excess water removed when it rains to avoid leaks due to filtration. The gravilla acts as a natural insulator for the home, both for the cold and hot temperatures. It limits the exchange of the air inside and outside via thermal transfer by trapping air in bubbles that act like mini insulators. When the day time is very hot, the white gravilla reflects most of the solar heat away, and what's left of it after the sun goes down will act as coolers when the gravilla damp their surface due to the cooler air. Like I said (and is done in commercial roofs) you can wet the roof when it's very hot to create a rapid exchange of temperature from the gravilla and cool the house even more during the hot streaks. It's highly recommended to AVOID building a new roof line above a concrete slab, because the normal heat exchange is disrupted and will cause mold and other problems to the concrete roof. Mold accelerates the decay of the salt-oxides in the concrete and also can infiltrate the pores all the way inside the house.
	Quote