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School me on building a concrete slab on sandy soil

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School me on building a concrete slab on sandy soil

Old 11-28-2020, 07:25 PM
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Originally Posted by Boataholic View Post
Sounds like you nailed it. I would add a coat of acrylic "cure n seal" with at least 30% solids. Apply soon after last troweling pass
Explain ... what does this do?
Old 11-29-2020, 03:09 AM
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Originally Posted by Tireless View Post
Explain ... what does this do?
A curing compound keeps the moisture in the slab so it can cure properly. If you don’t do this you can also wet cure it by keeping it continuously moist at least first 7 days.
Old 11-29-2020, 03:15 AM
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Get more info on fiber. There are two types - micro and macro. When you say structural it likely infers macro but you need to confirm. Also need to know how much per yard. Minimum is usually 4lbs/yd of macro. Make sure finishers are comfortable with fiber or your slab will be furry although you can burn off any on surface with torch.
Old 11-29-2020, 04:58 AM
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^ Thanks.
Old 11-29-2020, 05:03 AM
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Just started a custom home about a mile from the coast in NW Florida. Sandy soil required an engineered slab. Lots of footers and rebar.


Old 11-29-2020, 07:42 AM
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5-1/2” slab 4000psi concrete. 12” perimeter with re bar.
Old 11-29-2020, 10:22 AM
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Originally Posted by Resinhead View Post
Just started a custom home about a mile from the coast in NW Florida. Sandy soil required an engineered slab. Lots of footers and rebar.

This is how it's done on much of the Texas coast ... as though you turned a large ice tray upside down in the sand ... works pretty good if bulkheads and retaining walls are kept up ... there are many 50+ year old homes around here that've been through multiple hurricanes and are none the worse for wear ...
Old 12-07-2020, 03:25 PM
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It got real today. I appreciate all of the advice.



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Old 12-30-2020, 12:45 PM
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UPDATE ....... done! Thank you for all of your input.

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Old 12-30-2020, 01:23 PM
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When they say 4” slab, they end up between 3-3-1/2” at best. If you do the prep you can be sure that it is at least 4” or better and your footers ar at least the size on plans. Just understand that your concrete guy will end up ordering about a truck short of finishing the job! After poured and finished cut relief lines about every 10-12’ just about 1/4” deep. If/when it cracks it will happen here.
Old 12-30-2020, 01:27 PM
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Looks good!
Old 12-30-2020, 02:15 PM
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Originally Posted by TheRealMacGyver View Post
When they say 4” slab, they end up between 3-3-1/2” at best. If you do the prep you can be sure that it is at least 4” or better and your footers ar at least the size on plans. Just understand that your concrete guy will end up ordering about a truck short of finishing the job! After poured and finished cut relief lines about every 10-12’ just about 1/4” deep. If/when it cracks it will happen here.
Lol ..... you nailed what ALMOST happened. I was overseeing the entire project. I went with a 6 inch slab and apron. The crew was ready to pour at 5 inches .... I wasn't. Their estimate of the yards required to make the apron was off by 1.5 yards....I corrected that. I made certain they cut relief lines the morning after the pour. The project wound up requiring two crews. The second crew's work product was far better than crew #1.
Old 12-30-2020, 03:47 PM
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Originally Posted by TheRealMacGyver View Post
When they say 4” slab, they end up between 3-3-1/2” at best. If you do the prep you can be sure that it is at least 4” or better and your footers ar at least the size on plans. Just understand that your concrete guy will end up ordering about a truck short of finishing the job! After poured and finished cut relief lines about every 10-12’ just about 1/4” deep. If/when it cracks it will happen here.
Sorry MacGyver but joints should be 1/5th of the depth of the slab. 1/4" won't do diddly. 4" slab- 3/4" deep 5", 1" deep.
Old 12-30-2020, 03:53 PM
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Originally Posted by Boataholic View Post
Sorry MacGyver but joints should be 1/5th of the depth of the slab. 1/4" won't do diddly. 4" slab- 3/4" deep 5", 1" deep.
I assumed he meant 25% of the slabs depth.
Old 12-30-2020, 05:38 PM
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Originally Posted by Tireless View Post
I assumed he meant 25% of the slabs depth.
Maybe but 1/4" doesn't mean 1/4 of slab depth.

Looks like they did a good job. Congrats!
Old 12-30-2020, 06:09 PM
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Originally Posted by Boataholic View Post
Sorry MacGyver but joints should be 1/5th of the depth of the slab. 1/4" won't do diddly. 4" slab- 3/4" deep 5", 1" deep.
you are probably right, but my 4” slab I did about 1/4” cuts and have no cracks other than on those reliefs. Mine was done in 2015 and is a 28’x30’ foundation.
Old 01-25-2021, 03:33 PM
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While waiting for the building to arrive, I decided the lightly brushed slab needed a sanding job before it is closed in. I grabbed a three ought sanding block and started walking. I noticed a change in the surface. Will rinse and repeat tomorrow.


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Old 01-25-2021, 03:51 PM
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Originally Posted by tireless View Post
while waiting for the building to arrive, i decided the lightly brushed slab needed a sanding job before it is closed in. I grabbed a three ought sanding block and started walking. I noticed a change in the surface. Will rinse and repeat tomorrow.


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wtf???
Old 01-25-2021, 06:34 PM
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Originally Posted by Boataholic View Post
wtf???
Drag the block on the pad, knocking down the weak edges on the virgin broom finish ridges. Better to do it now and have it wash away before the building is closed in. When I was done with the first pass a decent amount of cement dust was evident. Rain tomorrow will wash it away.

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