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Thoughts on pouring floor slab (Philippines)

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Thoughts on pouring floor slab (Philippines) Lloyd 11-22-2006
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Posted by Lloyd on November 22, 2006, 4:41 pm
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.



Posted by Glenn on November 22, 2006, 4:55 pm
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.


>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.
>
>


Posted by Deputy Dumbya Dawg on November 22, 2006, 5:23 pm
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.
:
:



Posted by Lloyd on November 22, 2006, 5:59 pm
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"

>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.
>:
>:
>


Posted by Jonny on November 23, 2006, 7:48 am
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...
--
Jonny
>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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