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can you use inch rock without fines under concrete slab

What Is The Best Sand To Lay Slabs On? - Tile Master Blog

Jul 02, 2021· What do you put under paving slabs? 3: Mortar preparation. Lay the paving slabs on a full mortar bed, which should support the whole slab, not just the corners. Use a mortar mix of 6 parts sharp sand to 1 part cement. Mix together with just enough water to …

3 Reasons Why It's Important To Use Crushed Stone Under ...

Apr 28, 2014· Concrete may seem strong, but after many years, elements, and pressure, it will eventually crack. So in order to make your concrete last as long as your money that went into it, adding a layer of crushed stone under a slab of concrete will increase the life of your investment. Here are 3 reasons why a layer of crushed stone is important to the life of your concrete:

Digging UNDER poured concrete home floor? | GON Forum

Jan 12, 2012· My great-uncle has one of those homes that is a single story built on a 8" poured slab with fiber impregnated concrete. He has a water leak near where the water line comes in under the slab. We have dug up the water line to the slab and not found the leak, but we can see where water is coming from somewhere under the house slab.

How to Build Patios Without Cement | Hunker

Although building your patio over a concrete slab helps to ensure it won't settle unevenly later, you can build a patio without cement. By laying flagstone, tile, brick or other sturdy, flat pavers on a well-prepared base, your patio will be less expensive and more water-permeable.

12 Tips for Mixing Concrete Off-Grid on a Budget – Outdoor ...

For the most part, you can use basic dimensional lumber for forms. The straighter the better, of course. 2 inch thick boards like 2x4s, 2x6s, 2x8s, and so on work really well. In a lot of cases, especially if the forms aren't going to be too tall and if you use plenty of stakes, then you can even use 1-inch thick boards like 1x4s and 1x6s.

How to Pour 1-Inch Thick Concrete | Hunker

There aren't many reasons to have only a 1-inch thick concrete surface. It is too thin to use as a flooring just by itself; however if you need to resurface damaged concrete, a 1-inch layer is a good amount. The old surface is prepared so that the new concrete will adhere, then the new cement is added.

Fill under slab? - Fine Homebuilding

Feb 13, 2006· In dry climates you have to put sand or crusher fines over the vapor barrier (that is, directly under the slab)to keep the slab from curling.I would defer to your concrete guy, but technically there is no reason why you can't put down your VB, your insulation, and then concrete.

What size crushed stone for concrete slab?

Jun 22, 2020· The usual range employed is between 9.5mm and 37.5mm in diameter. - Fine aggregates are usually sand or crushed stone that are less than 9.55mm in diameter. Typically …

FAQ: How To Lay Concrete Slabs On Soil? - Tile Master Blog

Jul 02, 2021· Surprisingly, it is possible to lay a patio over old concrete paving slabs. You can even do this without using mortar. You will need to lay a base of sand at about 2-3cm deep. Can you lay pavers on just sand? The vast majority of sand you see is just small pieces of rock. On some beaches it can be tiny pieces of sea shells or broken coral.

concrete - Is a 6 inch reinforced slab suitable for a ...

Jun 30, 2017· Can I use a 6"or 8" slab with 3/8 rebar 16" grid and be safe with a round water tank Apx. 6 Ft. Round 12,000 Lb. when full? And what test would it need to be? There will be no plumbing under the slab or in the slab, just sitting on the level desert rock. Thanks for your thoughts.

Self Compacting Stone - Ask the Builder

You can't get the same result using the recycled concrete because there's too much friction between the sand and angular crushed stones in the recycled mix. The recycled concrete does compact very well using rollers or plate compactors, but as you said, that's very tough to do in your case.

Can you pour concrete over river rock? Will it hold up ...

Aug 28, 2015· HASTINGS on Aug 29, 2015. Just to let all know. Yes you can put concrete over river rock. Marilyn the big trick is going to make sure that it is level to start with and frame it out. You may want to bring some sand in to help level. Then once you have it all prepared and ready to pour.

Are Cracks in Concrete Slab Normal? - Building Advisor

Sep 19, 2019· Concrete can support a lot of weight in compression, but is weak in tension. For example, a concrete wall can support tons of weight from above, but will crack easily if pushed sideways forcing it to bend. Similarly, a slab will crack if too much weight is placed in one spot, or if the soil settles unevenly, bending the slab.

Does Anybody Use Sand as a Base Before They Pour Concrete ...

Otherwise, what is under a slab depends on the ground you are pouring the slab on, some soils don't need anything, some need a lot of help. From American Concrete Institute ACI360R-10 Guide to Design of Slabs-on-Ground 4.5 Design of Slab-support system 4.5.1 General "After subgrade soils have been classified, the general range of K values can ...

Pea gravel for interior floor slab support - Geotechnical ...

Jun 06, 2006· 2. Geodude1 (Geotechnical) 1 Feb 06 14:56. Pea gravel is still commonly used under floor slabs and tight places. Floor contractors don't like working with it because it displaces so easily under foot and while placing concrete. Many contractors in the Puget Sound region have opted for clean, crushed rock such as 5/8".

Pouring & Finishing Concrete Slabs | QUIKRETE: Cement and ...

Cut in control joints using a groover and straight-edge (a 4-inch thick slab will require control joints a minimum of every 10 feet in each direction). NOTE: control joints should be cut a minimum of ¼ the depth of the slab. Step 12 Use an edging tool to consolidate and shape the edges of the slab.

What can be done about voids under concrete? | Slabjack ...

Apr 03, 2016· Dealing with voids whether they be stable or dynamic is an important part of maintaining your concrete slabs whether they be residential, commercial, industrial or municipal. If you see a void opening up under your concrete slabs give the concrete raising and leveling professionals a call we will get you taken care of. 1-855-752-2522.

"pouring" *dry* concrete | Homesteading Forum

Oct 06, 2013· The problem will be putting any kind of finish on it. You need to get a little "milk" to the surface to trowel it smooth. You may be able to smear a cement water slurry over the surface after the concrete has set a little but a couple of people with hoes and a wheelbarrow can easily mix up enough concrete to do a small slab.

How fine is too fine a gravel for sub-slab drainage ...

Feb 27, 2019· So all the small stuff goes through and you shouldn't have much of anything smaller than 3/4" and nothing really much larger than an inch or so. Gravel is also sold by number sizes. #2 gravel is generally 1"-2-1/2", and is appropriate for subslab work. #3 is generally 1/2"-2" and is also just fine …

Gravel vs Concrete Shed Base | Which Is a Better Choice?

If it does, you can put the flooring right on top of the shed's wooden floor. If the shed has no built-in floor structure, you'll need to put a subfloor down on top of the concrete before adding the flooring. You will also want to make sure the base of the shed is sealed from moisture.

Do You Need a Building Permit for Outdoor Concrete Work ...

Surprisingly, you may be allowed to skip the permit process entirely when constructing an outbuilding such as a tool shed, playhouse, greenhouse, gazebo, or the like, with a concrete slab foundation. However, you will find that there is likely to be a size limitation for the roof of …

Should vapor barrier in slab be under 4 in. of gravel or ...

May 03, 2011· The best thing I've found for preventing slab curl is to pour a low-water mix. Water reducer doesn't cost much, and you can use a lot less water in the mix while improving the short term workability. It is a whole lot easier to get the mud on the ground when it flows like a 7-inch slump for the first hour, then suddenly turns into a 3" slump.

Is Rebar For Garage Slab Important? (What You Need To Know!)

Aug 14, 2021· When the concrete contractors (or you) say that they (or you) are pouring a 4″ thick garage slab, what they (or you) mean is that 4″ is the "nominal" size. In other words, the height of the slab form is 4″. Real Garage Slab Thickness. So the number quoted is the "nominal" thickness. This is not the "real" thickness.

Can I use regular XPS to insulate under a basement ...

Regular XPS is perfect for underslab installations. Just be sure to heavily tamp the below grade rock and sand so it's rock solid. Wet it abit and go it again. Racked flat, you lay the XPS and glue the pieces together with PL300 caulking glue. (It...

insulating board under concrete slab??? - JLC-Online ...

Dec 19, 2009· You can pour a floating slab with slab-edge insulation without excavating or pouring a frostwall. Pour a reinforced concrete grade beam as a frost-protected shallow foundation and then insulate and pour a slab inside of it.

Foundations - Form Footing - Carnation Construction

Jan 04, 2009· Fill behind the inner Form-a-drain with crushed rock. Completely fill with " 1.25 inch crushed rock without fines " up the inch or so gap between the inner Form-a-drain and the center soil mound that is under the slab. You will need to trickle it down there. Do not over force it or compact it as that may make the Form-a-drain bulge out.

Construction Design-Concrete-less Slab on Grade – Northern ...

Sep 29, 2019· This home is very rural, an hour away from the nearest concrete plant. Concrete placing and finishing in the area runs about $7 per square foot for a four inch slab. The cost figures the same amount of sub-slab insulation if either concrete or Advantech are used, so the cost difference is materials and labor to install subfloor.