If you do that, water can flow readily under the footings. If instead you pour your footings on either undisturbed soil or compacted crusher-run gravel, it's a good idea to include a few 4" pipes through the footings to connect your sub-slab crushed stone with the perforated pipe installed on the exterior side of the footings.
Last note, I put down recycled 25 psi XPS under the slab and on top of the radon pipes in the rock bed. The plastic went down next, not under the . I think that is the more common placement. I found the net re-inforced plastic from HD to be quite tough and able to stand up to the many trips across it during pex and mesh placement.
And Why is that a problem? As I am told with the plastic directly under ninth the concrete all the water in a 5 inch slump has to go up and as it moves up and sits on top of the concrete to evaporate you get separation in the concrete because the water sits on top of it to long. The concrete will not get to be the strongest it could be.
Carmel, Indiana. Jul 27, 2017. #1. Hi used Agricultural lime or Lime Stone Dust for above ground pool pasted and compacted and wetted as I compacted it. After installing the pool the lime stone dust as turned to soup. I am very frustrated because it was recommended this and now I can literately put my foot in it like a puddle of water.
Excavate the soil to a depth of 8 inches, allowing 4 inches for the gravel base and 4 inches for the concrete slab. The soil should be graded, or sloped, so the excavation site's center is ...
3/4" Crushed Limestone. Used for construction purposes, mainly as aggregate with or without a binder. Road base or road surfacing material are the major uses without a binder. Aggregate for cement and asphalt in highway and road construction, as well as for repair in residential and nonresidential construction are the major uses for aggregates ...
Why? In California they place sand between slabs and plastic vapor barriers—in Florida they don't. Perhaps it was the drug culture of the 60's that turned brains into coleslaw but it is hard to understand the lunatic practice of placing a layer of sand over the top of a plastic ground cover under a concrete slab in California.
Limestone can be used in so many ways, including the following 5 situations: Crushed limestone is often used as the aggregate in a concrete mix, along with cement, water and sand. Crushed limestone is the perfect base for roads, as it is strong enough to withstand vehicles driving over it. It is also smooth and affordable.
Our contractor is telling me that a layer of gravel is not needed under the concrete footers. I called the inspections office in my area and spoke to the lead inspector in my area and he told me the same thing, but couldn't tell me why gravel isn't needed under the poured concrete. I called the inspector for a second opinion.
Excavation of approximately 20-30 centimeters is considered ideal for an outdoor patio construction. However, care must be taken to fill it with concrete sand instead of crushed limestone screening as it has comparatively larger particles that enable good draining as …
If you were to use just crushed limestone with no fines, the flagstone would have a good base, but not the best. The introduction of these fines is what allows the crushed limestone to mimic poured concrete. Without the fines there would be considerable void space between each of the larger pieces of limestone.
Under all of it are 8-10" of reclaimed asphalt. Years past some asphalt companies required the gravel used for the based be class 5 (crushed limestone). Conbit (reprocessed concrete and asphalt) could fail. It would fail because the ground concrete …
I have always just graded the dirt under the slab so it drains off to the sides or bottom same as the concrete slab will drain, compacted it and called it good. Seems to me its better to put my money into thicker concrete and rebar (to span cracks and keep them from becoming "steps") but I …
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:
The top 6 to 12 inches of the backfill under the slab should be filled and compacted with well-graded gravel or crushed material. "Walls are typically backfilled with the removed earth or with a granular, open-graded material," says Tull.
Also, What Stone goes under concrete slab? crushed stone. Can you put footings under concrete slab? edit – To put footings under the slab, you can cut holes wherever needed, excavate for footings (Sonotubes or concrete piers or similar) and then patch the concrete slab. How many inches of gravel do you need for a concrete slab?
Limestone Screening or Gravel as a Base Material To Make A Side Walk With 2'X2' Concrete pavers. So I am making a side walk at my house on next weekend, I researched a bit and found out that I need to dig around 4" and then lay gravel and then on top put 2'x2' pavers. I decided to dig around 1" install 2" high plastic edging and then throw in ...
When it comes to building, hardscaping and landscaping materials, there are a lot of varieties from which to choose. Exploring the differences between similar materials such as crushed stone and gravel, rock vs stone will help you select the best materials for your project.. Crushed stone is made from rocks that have been broken down by machines called crushers, giving the stones more angular ...
A smaller gradation of crushed limestone or gravel (max particles in the range of 3/8-3/4″ or 'screenings') can also be used for pipe trench backfill but this material may take excessive amounts of water because the fines absorb alot of moisture.
Using sand as a base for concrete may create unsightly and costly problems in the future. Just as every home needs a good foundation, your property's concrete slab needs a good subbase to function properly. Contractors sometimes use sand as a subbase when pouring concrete, but it all depends on the slab's function as well as your region's ...
Depending on where you live, rigid insulation under a concrete slab might be required! The IECC, a regulatory code that ensures new construction is environmentally conscious, requires a minimum of R-10 insulation in Climate Zones 4-8. You can check if you live in one of these zones on the IECC zone map.. If the IECC requires rigid insulation under concrete slab, you'll also need to get an ...
4. Subbase for Concrete Slab Subbase is a layer of gravel, which is fairly cheap material, placed on top of subgrade. The subbase placement is optional and it serves as a work platform for construction of the slab and provide more uniform support for the slab. As the thickness of subbase increases, the ultimate load carrying capacity of slab ...
The top 6 to 12 inches of the backfill under the slab should be filled and compacted with well-graded gravel or crushed material. Should you compact gravel before pouring concrete? Whether you pour concrete for a walkway or patio, a strong gravel base is required to prevent the concrete …
Answer (1 of 7): 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 (depending on soil conditions), bank s...
I'd put a great cross-laminated vapor barrier on top of the gravel before you pour the slab in the garage. This will keep water vapor from rusting tools and causing havoc in the garage in the ...
The last thing you want your customers to envision when thinking of a concrete floor is a damp, cold basement slab. One of the reasons those old basement floors were like that was because they had no vapor barrier beneath them, leaving an easy path for water vapor from the soil to migrate into the slab, assuring that the cold clammy damp feeling never went away.
Limestone: The most popular crushed stone option, limestone is easily crushed and used in ready mix concrete, railroad ballast, and drain fields. Quartzite: Used for road construction, rubble, and in between railroad tracks due to its durability. Rip rap: Larger stone used for erosion control.
value to be used for designing concrete floor slabs. If a high quality, well compacted granular sub-base is used under the floor slab, the k value will increase. TABLE 2 As mentioned previously, a sub-base is not mandatory for floor slabs on grade. A granular sub-base,
Fixing Erosion Under Concrete. The best way to fix erosion under concrete is to fill voids with material that's resistant to erosion. This is usually done with the slab jacking process. Scritchlow Concrete Lifting and Slab Jacking uses only crushed limestone and Portland cement which is not susceptible to erosion.
Hi, I am Mike Day, owner of Day's Concrete Floors, Inc. in Maine, where I've been working with concrete for 40 years now, and this website is where I can share with you all the knowledge and wisdom I've gained from installing all kinds of decorative concrete, concrete floors, concrete overlays, stained concrete and also fixing cracked or spalled concrete.