which sand to put underneath slabe

Home - which sand to put underneath slabe

What Should I Put in the Bottom of My Pond?

 · To protect the lining underneath, you will have to add sand or another material. This will also ensure that the pond liner remains trapped in the bottom. However, there is always a confusion among most people about what they should put at the bottom of the pond.

More Details

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

 · The vapor barrier should go directly underneath of the concrete slab. A sand layer should NOT be installed between the VB and the concrete. Millions of cubic yards of concrete are poured directly on top of fluted steel (an obvious vapor impermeable material) floor decks every year.

More Details

What to use under concrete slab, sand/gravel : DIY

You would use gravel and sand with the most important part, compaction. Rebar in 4 x 4 grid with dobies underneath. Rebar size and concrete mix design to be determined by the size and depth of your slab. Don''t forget "control joints". level 2. keitpo.

More Details

Why Put gravel under concrete?

 · Coarse gravel, like 57 stone, under a slab is used as a capillary. break to prevent ground moisture wicking up through the concrete. All good concrete needs the bottom almost as flat as the top, creating a uniform thickness to maximize strength. The concrete.

More Details

Should You Put Gravel Under a Deck? Here''s the Answer

Sand Sand is similar to soil in that it absorbs moisture and can erode easily. It is also easy for insects, rodents, and weeds to take up residence or put down roots. Mulch Wood chips, sawdust, or mulch under a deck in a dry climate may work, although insects

More Details

Gravel or Sand Below a Foundation

 · I can tell you that I wouldn''t want to put sand fill (especially river sand) directly under the footing. If you are wanting to provide a working platform to prevent disturbance due to steel placing, leveling course, to minimize precipitation disturbance, I would use a layer of crushed stone or a blinding mat (mud-mat) or a well graded sand and gravel (like a subbase or base course).

More Details

Saturated sand under shower slab

 · 2) Remove excess sand and wait for sand and brick to dry. 3) Drill into side of bricks and install stainless rods then pour a 70mm thick concrete slab. I will add Lanko 302 accelerator. 4) 2-3 days later apply Lanko 124 ulltraprime and then 30 mins later …

More Details

What is the best base for concrete slab?

 · What should you put under a concrete slab? Whether you pour concrete for a walkway or patio, a strong gravel base is required to prevent the concrete from cracking and shifting. Gravel is especially important in clay soil because it doesn''t drain well, which results in water pooling under the concrete slab and slowly eroding the soil as it finally drains.

More Details

Can I Pour a Concrete Slab Directly onto Dirt? – …

 · Choosing not to use sand or gravel underneath a slab does not necessarily guarantee it will sink. But it does make drainage more difficult. Water can get trapped under the slab and, over time, cause the same sort of erosion. Both sand and gravel act as a filtering

More Details

Rock Dust vs. Sand Under Paving | Home Guides | SF Gate

 · Rock Dust vs. Sand Under Paving. When it''s time to pave or repave your walkway or patio, it is important to choose quality pavers that hold up to weather and foot traffic. Just as ...

More Details

How to Prepare the Ground Before Pouring Concrete …

To shore up the subsurface, sprinkle a thin layer of cement sand onto the gravel and dampen it with water. Do not leave any standing water and allow the dampened sand to dry for about an hour before pouring the concrete. Ground preparation is key to pouring sidewalk, driveway or any other concrete slab. According to Tim Carter from Ask the ...

More Details

How to Fill a Void under a Concrete Slab | URETEK Gulf …

 · A sand-cement grout can be used to fill voids under concrete slabs. This mix of sand, cement, and water is pumped through holes drilled to fill up the voids. While this method of slab jacking is cost-effective, there are major drawbacks to opting for this type of repair. Void penetration is not usually extensive, and this will result in the ...

More Details

Pipes In Concrete Slab

 · The concrete slab is usually positioned on a layer of sand for drainage or to behave as a cushion. The pipes which are put in underneath a concrete slab are some of the important elements of your property mission and you could test each pipe.

More Details

What size crushed stone for concrete slab?

 · What size crushed stone for concrete slab? 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 the most common size of aggregate used in construction is 20mm. A larger size, 40mm, is more common in mass concrete.

More Details

What Type Of Gravel Under Concrete Slab

What Type Of Gravel Under Concrete Slab. Concrete floor problems building proper subgrade prep concrete gravel vs concrete shed base which is fill a 3 inch gap under my concrete pouring a concrete slab concrete floor problems building. Subgrade and subbase for concrete slabs the constructor subgrade and subbase for concrete slabs the ...

More Details

Polyethylene Under Concrete Slabs

 · What goes under the concrete in a slab-on-grade home? In the old days, not much — just dirt. Eventually, contractors discovered that it made sense to include a 4-inch-thick layer of crushed stone under the concrete. The crushed stone provides a capillary break that reduces the amount of moisture flowing upward from the damp soil to the permeable concrete. Since the crushed stone layer ...

More Details

Do you need gravel under a concrete slab?

I agree with David Powers and disagree with a statement made by Michael Dillon. Short answer is "yes" but rather than gravel one should use a material that will suffer compaction such as ABC (aggregate base course), crushed concrete, or even (depe...

More Details

Don''t Use Loose Sand Under Concrete Slabs| Concrete …

 · Each test specimen was tested with no sand, a 1-inch sand layer and a 2-inch sand layer. In addition, 1- and 2-inch sand layers were placed over a steel base and tested to show how the sand would affect subgrade support over a very stiff base.

More Details

Different Types of Sand and What They Should be Used for …

Sharp sand used for concreting and masonry work Builders Sand – (aka River Sand, Screeding Sand, Plasterer''s Sand, Mason''s Sand or Bricklayer''s Sand) Unlike the sharp sand above, builders sand is much finer due to the fact that the grains are much smaller.

More Details

What Sand Should I Use to Level Underneath My Pool?

 · Trying to decide which sand to use underneath your pool doesn''t need to be a struggle. Our experts explored the most popular choices and shared their opinions. …

More Details

Why do you need to put sand under your pool?

The only pools that require sand as a base are vinyl lined ones. The sand is easily troweled flat and smooth and provides a compactable surface free of any rocks or debris with sharp edges that could puncture the liner. Nowadays, it is mostly only...

More Details

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

 · 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.

More Details

How to Fill Voids Under a Concrete Slab | Hunker

Step 3. Mix the fill material in a wheelbarrow, using a spade. Combine one part Portland cement, one part fly ash and two parts clean sand for the fill mix. Add an expander additive to prevent the mixture from shrinking during the curing phase after you pump it into the voids. The amount of additive will be dependent on manufacturer instructions.

More Details

Sand under slab instead of gravel

 · My main concern right now is whether the sand (under the poly, foam and cement slab that we will be putting down in a week) will settle as the dampness moves down. My thinking is that the sand is damp now because it was damp when it was put in the basement in late November and that there has not been adequate heat to evaporate the moisture.

More Details

why sand under concrete?

 · We commonly use pea fill here, sand is rare for concrete work. Primarily because pea-fill is self compacting and sand has to be jetted or it will settle unevely. Run a hammer across concrete poured on sand after a year and you''ll hear the hollows. reodeler

More Details

Under Slab Membranes – A New House

 · Cost Difference. Two rolls of 50m x 4m Polyethylene film should be sufficient to protect the typical house slab. Based on a quick internet search this week (June 2015) I found the following prices. 2 rolls of Medium Impact Polyethylene would cost around $150. 2 rolls of High Impact Polyethylene should cost around $220.

More Details

Gravel Or Sand | DIY Home Improvement Forum

 · What is the difference between useing gravel or sand as a bed over compacted soil in order to lay a concrete slab? I hear of both. And, I have always heard that wet sand is compacted. But, in other projects, when watering down a layer of sand and walking on it, your foot sinks about and...

More Details

How To Fill A Void Under A Concrete Slab (DIY) | …

 · Sand or gravel over clay of about 4 inch thick or other poorly draining soils can be placed under the slab to provide even support. Should you put plastic under concrete? 6-mil Visqueen (polyethylene plastic) had ever since been used as vapor retarders to barred vapor under concrete slab.

More Details

Can You Lay Paving Slabs on Building Sand?

Simply put the machine is doing all the hard work. In our opinion a standard back garden patio installation with a good sub-base and substantial drainage, we would recommend a 7:1 mix which equates to 7 even parts of sand and 1 part cement. For example, if you have 70kg or sand …

More Details

Laying paving slabs on soil/earth. What would you do?

Meh, we had play house – put it on stilts and then on a paving slab under each corner. We did this and it''s great – easy to spray off underneath and keeps bugs out. But then we''re in Australia ...

More Details

Subgrades & Subbases for Concrete Slabs

 · Concrete strength also comes into play, but most slab concrete is around 3000 to 4000 psi, so it''s not a major factor. The tensile strength of concrete is typically taken as 10 to 15% of the compressive strength, so only about 400 or 500 psi. Compare that to the tensile strength of Grade 60 rebar, which is 60,000 psi.

More Details

Do I need to apply SBR to underside of INDIAN …

I plan to put down 100mm type 1 MOT and whacker plate it with a 1:80 fall sloping away from the house, followed by 50mm mortar which will be 4:1 sharp sand to cement, as long as this is all correct, please can someone advice if I actually need to apply SBR to ...

More Details

Can I use sand under concrete slab?

If you don''t put rebars in a 4-inch [10 CM] slab, then it won''t be reinforced concrete - and won''t perform.As a general rule, any section of concrete must have at least 0.25% of its area in rebars to be considered reinforced concrete and do the intended job.

More Details