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Hi, recently had a concreter disconnect my airconditioner while pouring a concrete slab. While doing this they let all the refrigerant escape. How/ who can replace this ?

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Do not know where you are located, but these people should have never tried to disconnect the unit. Most states require the a person working on a HVAC unit be licensed and the EPA requires that anyone working with freon also be licensed. Venting freon to the atmosphere is a big time no no and subject to a very large fine. I would require this contractor to hire at their expense, a licensed a/c contractor and have them pay for it since they caused the problem. Freon is getting to be very expensive

Posted on May 15, 2008

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Is there a concrete floor sealant that eliminated moisture seeming through the concrete slab?


if you want to seal the surface a epoxy paint is good !

but if the water come from under the concrete slab only a hole with aggregates ( small rocks ) and a swamp pump works fine !

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Convert 30pounds per sq.foot to pounds per cubic foot(concrete=150#/cubic foot at 1in. thick conc. slab).


These are not the same, so cannot be directly converted.

Pounds per sq ft is a measure of pressure, while lbs / cu ft is a measure of density, weight per unit volume.

I think maybe what you are doing here is converting the weight of concrete in a 1" slab, where a sq ft would contain

1 x 1 x 1/12 = .0833 cu ft

The figure of 150 lb/ cu ft is correct for the average density of concrete, so the above slab would have

1/12 x 150 = 12.5 lbs/sq ft at 1" thickness

BTW that is a thin slab of concrete, insufficient even for a light-duty pathway. If you are referring to a screed for tiling or similar, that is cement.

Mar 01, 2015 | Office Equipment & Supplies

1 Answer

Yards of concrete do I need to pour a step 5'x 20" x 48"


If you poured these dimensions as a solid concrete stairs, it comes out to 1 and 1/4 yds. (note that anytime you order concrete to always figure in at least 10-15% more). So 1 and 1/2 yds "should" be adequate,, and ordering 2 yds would be 100% worry-free.

But most steps/staircases are not poured "solid". Usually you have solid walls (approx 8" to 12" thick), with a compacted mound in the main section of the formed area which still would allow approx 6" minimum thickness below the treads/risers at their inside edge.

The top platform slab should also be 6" thickness.



In other words, pouring them completely solid is overkill and not necessary. More weight = more prone to settle without proper foundation or wingwalls.

It\'s important to have a solid footing/foundation for the steps, that extends below the grade line (depth dependent on what area of the country you\'re in and the typical "frost line").

It may also be advisable to use short rebar "dowels" drilled into the existing wall the steps will be against, to prevent settling or shifting.

More specifics and info is needed for a more accurate answer.

Oct 16, 2014 | Building Materials

1 Answer

How do i know how many cubic meter of concrete pour in 50 squre meter and 50m


as in any volume calculation, follow this formula:

a x b x h = volume
a x b = area
h = height
all dimensions must be in same units, if you use m, all must be m, if you use ft, all units must be ft, use decimal not inches in imperial measurement.

in your example you give area of 50m2, you did not give what thickness of the slab, or should i assume this is 50m thick slab?!?

Oct 07, 2014 | Building Materials

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How can i build a cement speed bump?


Is this for vehicles? If so concrete won't work as it will be too brittle especially when it gets cold.

Jul 14, 2014 | Building Materials

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How to repair a water pipe leak under a concreat slab


Things to consider are cut and replace -1. Concrete saw the affected area replace and re-concrete (impact hammer is another option but a concrete saw is neater and you can control the cut better.. 2. You can bypass the pipe. 3. Dig under the slab - you obviously would need to be near an edge.

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What is post tension slab


It is a slab of usually Concrete that has Tension introduced upon it's Reinforcing rods/cables, AFTER it has been Poured, dried/set as opposed to a Pre-tension slab whereas the Tension is put on the reinforcing rod/cables inside the concrete and are Tensioned BEFORE or While it drys/sets

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