Thoughts on pouring floor slab (Philippines)

I am about to pour a 4 inch thick, 20 ft by 30 ft cement floor slab. I am located in the Philippines. This will be on clay type soil.
I am wondering about reinforcement. I was thinking of digging 6 inch wide by 4 inch deep "trenches" spaced 10 feet apart, in the ground before pouring the slab to create a "backbone" that would hopefully strengthen the slab. This would effectively create a "beam" under the slab. The trenches would be in a tic-tac-toe configuration. If you look at the website below, I would keep the "trenches" in line with the concrete posts.
Would this help? Or would this cause problems?
I do not have access to reinforcing wire mesh, and they have indicated to me that rebar is not needed. I would like to reinforce the slab.
Any recommendations.
I have a website that shows the progress of the house being built:
http://paradisefound.50webs.com
Building a house in the Philippines is an experience you will never forget. There are many practices that would cause you to shudder.
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Many here will disagree with me but I would want #4 rebar, 24" each way, 100% tied. Personally, I would not do the trenches. However most *basement* floors around here are not reinforced. You didn't designate what the use was.

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If you do go with the trenches why not put them under the area where the interior and exterior walls will be?
peace dawg
:I am about to pour a 4 inch thick, 20 ft by 30 ft cement floor slab. : I am located in the Philippines. This will be on clay type soil. : : I am wondering about reinforcement. I was thinking of digging : 6 inch wide by 4 inch deep "trenches" spaced 10 feet apart, : in the ground before pouring the slab to create a "backbone" : that would hopefully strengthen the slab. This would effectively : create a "beam" under the slab. The trenches would be in a : tic-tac-toe configuration. If you look at the website below, I would : keep the "trenches" in line with the concrete posts. : : Would this help? Or would this cause problems? : : I do not have access to reinforcing wire mesh, and they have indicated : to me that rebar is not needed. I would like to reinforce the slab. : : Any recommendations. : : I have a website that shows the progress of the house being built: : : http://paradisefound.50webs.com : : Building a house in the Philippines is an experience you will never : forget. There are many practices that would cause you to shudder. : :
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The trenches will be in line with the posts that support the roof. The interior walls (non-load bearing) will be in line with the posts. Essentially this house could be classed as post & beam type. There will not be any load-bearing walls.
On Wed, 22 Nov 2006 22:23:49 GMT, "Deputy Dumbya Dawg"

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Minimum, do dig beams around the perimeter. Minimizes soil erosion that naturally will occur. Red lead paint application is a major concern in my book...
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Jonny
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