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**Khcyhshq** · 06-07-2012, 03:47 AM

The gravel seems like a good idea, and it's much cheaper than what I had in mind, but what about when it rains, and it's been raining a lot lately, wont the water get stuck between the pebbles and damage the roof?

Nope! Water will continue to drain as before, but a minimum will remain on the pebbles below the layers. They form bubbles(air pockets) with the heat, which in turn produce a normal insulation layer for the concrete slab.

In fact the layers of gravel will extend the life of the concrete by much more than how it's exposed to the elements now.

06-07-2012, 03:47 AM	#13
Khcyhshq Join Date Oct 2005 Posts 403 Senior Member	The gravel seems like a good idea, and it's much cheaper than what I had in mind, but what about when it rains, and it's been raining a lot lately, wont the water get stuck between the pebbles and damage the roof? Nope! Water will continue to drain as before, but a minimum will remain on the pebbles below the layers. They form bubbles(air pockets) with the heat, which in turn produce a normal insulation layer for the concrete slab. In fact the layers of gravel will extend the life of the concrete by much more than how it's exposed to the elements now.
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