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Why Put Gravel Under Concrete Slab On Grade

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Proper Subgrade Prep

20-9-2007With slab-on-grade foundations an alternative to native soil material may be used to restore grade These imported fills may include granular materials such as sand gravel Contractors often ask how to backfill foundation walls for an area that will end up under concrete flatwork


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Shed Base Concrete Slab or Gravel?

21-9-2009This may or may not matter to you but if you don't want to declare your shed permanent consider a gravel base How much do I want to spend? Consider the cost both of labor and materials of creating a concrete slab versus a gravel foundation How large is my shed? Most backyard sheds only need a gravel base


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waterproofing

How to stop concrete slab floor from absorbing water Ask Question Asked 6 years ago If so should I just put in some gravel fore go the french drain part? Would the paint/sealant on the slab cause problems in itself? If now what would be a good What drainage should I install under concrete slab in


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How Much Rebar to Put in Concrete

5-10-2019For instance 60 grade rebar which is usually required in earthquake zones can support 60 x 1 000 = 60 000 pounds per square inch Why Use Rebar Rebar must be used because concrete cannot support weight in a single area that would cause the concrete to bend Concrete


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Graniterock Technical Reports

Vapor Barriers under Concrete Floor Slabs Friend or Foe? by Steve Ragan Director Research and Technical Services The answer to this controversial question from both angles is a qualified "yes " Vapor barriers have been associated with certain concrete slab-on-grade


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Why there is a gap between the concrete deck and the

I dont know why there is a gap between the concrete deck and the ground is it normal as the deck shirks you can always put dirt or gravel in there to prevent more erosion but it really shouldn't get too much worse An above grade slab like this is prone to erosion like this


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Concrete Slab with Fiber Mesh or Wire Mesh

Concrete Slab with Fiber Mesh or Wire Mesh Reinforcement Concrete This is the true strength of any pavement If the sub-grade or rock under the slab is done correctly then the concrete behaves solidly Many homeowners worry about the concrete Why Work with Mosby Building Arts?


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CIP 29

CIP 29 - Vapor Retarders Under Slabs on Grade WHAT are Vapor Retarders Vapor retarders are sheet materials that minimize the transmission of moisture or water vapor from the sub-slab support system into a concrete slab Vapor retarders are typically specified in accordance with ASTM E1745 which requires that the permeance of the material be no


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compacting gravel under a slab

7-12-2004Re compacting gravel under a slab Tucker With 2 to 3 feet of rock I fail to see why you need either poly or insulation under the slab I think I would opt for the oozing and the thickening effect of the waffle bottom I would think that structurally it turns a 3 1/2 slab into something more like a 6 or 8 slab from a structural standpoint


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Best fill material 4 burying pvc under concrete

I'd like to know what is the best material to backfill around the pvc pipes before I pour the concrete Some say just sand would be fine I've heard a 50/50 sand/gravel mix also works well There is a clay like material already existing under the floor that I think would also work but I'm not sure how to re-compact it around the pipes


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Foundations Flashcards

Many slab-on-grade systems allow the concrete footing foundation and subfloor to be poured at the same time 2 Crawl Spaces Found in all climates but predominately in temperate regions In this system the insulated wooden ground floor is supported above grade on a foundation wall made of concrete or concrete


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Why dont I need to dig footer below frost line?

Re Why dont I need to dig footer below frost line? I am going to differ from the above two because I am planning a footer similar to that of dbhansen I was actually talking to a friend today who does masonry here in my area and it was his strong recommendation to put a footer below the frost line of any load-bearing slab


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HVAC Ducts Routed in Floor Slabs problems hazards

Air ducts in slabs problem troubleshooting guide Problems with HVAC air ducts placed in or below concrete floor slabs How to Recognize that heating or air conditioning ducts have been routed through or beneath a concrete floor slab HVAC Air Ducts Routed in Concrete Floor Slabs - why they are trouble Catalog of Functional Problems Found in In


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Owner Builder Concrete Slab in the Building Process

CONCRETE Concrete Slab Preparation Concrete slab foundations are the most common type of foundation in the Southwest There are much flatter areas to build on in the Southwest and less need for basements This changes somewhat in the higher elevations


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How to install PEX Tubing in a concrete slab

Home Installing PEX Tubing in Concrete Slabs If youre planning on pouring a concrete slab and wondering if a radiant heat system is right for you this article may help to make a decision The most common type of radiant heated slabs is the slab on grade type This type is suitable for many types []


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Crushed Stone or Crushed Concrete

If you are talking about the layer of stone you lay below a slab on grade for your home then I think this is not a good place for crushed concrete The reason gets back to why that stone is there in the first place The stone bed below a slab serves several purposes First it creates a solid base to pour your concrete


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why is it important to have gravel under a concrete slab

With slab-on-grade foundations an alternative to native soil material may be used to restore grade These imported fills may include granular materials such as sand gravel or crushed stone Contractors often ask how to backfill foundation walls for an area that will end up under concrete


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Why install the genpad?

Why install the genpad? Contractors usually install generators in one of a few ways on top of a bed of gravel on poured concrete or directly on the ground When you combine these with the black plastic pad that comes attached to the bottom of most generators installation is easy Each method works but each has big problems


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what size gravel is used under a concrete slab

what size gravel is used under a concrete slab why sand under concrete I m preparing to pour a finish concrete foor slab on grade The structural plans call for 4 compacted gravel base Gravel The Type of Gravel to Use for Pavers What Kind of Insulation Should Be Put Under a Concrete Slab in a Garage Gravel Size for a Driveway


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Concrete Slab

The fill under the slab must be graded and compacted Review the plumbing drain lines plus any water lines that will be under the slab Check the grade beams and thickened slab locations Make sure that arrangements have been made for the pest control companyto come just prior to the pouring of the concrete slab if you will have the soil


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How to Prepare Soil for a Concrete Slab

21-9-2017Concrete is beneficial in the garden and landscape Offering a solid surface that holds up to rain and traffic a concrete slab can provide a patio for entertaining a base for a garden shed or a spot to store anything off the ground Before you can pour a concrete slab


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Schedule 40 PVC conduit below a concrete slab

What is the minimum depth for placing Schedule 40 PVC conduit below a concrete slab? A If it's under a building there is no depth requirement If it's placed outside under a concrete slab then the minimum cover is 4 inches [Table 300 5] Q I want to come into a power distribution block with one feeder fused at 400A and feed three 150A panels


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Water and Sewer Service and Under Slab Plumbing

Here are some quick quality checks for your water and sewer service and under slab plumbing to improve your chances of a trouble-free installation Confirm the plumbing contractor will be scheduling the inspection with the local building department or county


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What is grade slab and what is the difference between

Grade Slab Flat concrete structure built on top of the soil at ground level and does not require support from underground footers or foundation walls This grade slab acts as the foundation for a home or building and provides a stable base for w


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Understanding Basements

A capillary break and vapor barrier should be located under concrete basement floor slabs Crushed stone or coarse gravel acts as an effective capillary break and sheet polyethylene in direct contract with a concrete floor slab acts as an effective vapor barrier


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Slabs

13-8-2015Slab thickness is the greatest single factor controlling the load-carry capacity of a slab-on-ground While other factors including concrete compressive strength the thickness and quality of the base material and sub-grade stiffness are important they are minor players as compared to the slab


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Why Do Concrete Slabs Crack

Why do concrete slabs crack? So if we can put a man on the moon why can we make concrete that won't I live on the upper floor of a condo with a slab balcony Lived here for 30 years There is a metal pan under my slab which is the ceiling for the patio below I'm trying to tell my association that the rust coming from that pan and the 3


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Gravel under footings

7-7-2004Gravel under footings | Structural-Int'l Bldg and Resid'l Codes If you put nothing in the voids then you have no strength attributed to the air/water in the void space Humor me and lets call it a nonstructural slab on grade over the pit full of bowling balls


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Footing Fundamentals

If you dig too deep and replace the soil to recover the grade you are adding back soil that has expanded by as much as 50% Under load it will reconsolidate and cause settling So when you replace material in the trench compact it thoroughly or else use large gravel


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Gravel under Concrete Slab

28-6-2016For the Civil Engineers out there Does anyone know of any real reason to spend the money to put gravel under a concrete slab? 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


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