Divide your result by the spacing measurement: 180 / 14 = 12.
How much rebar should I use in a slab?
Contractors sometimes use the “1/8 Rule,” meaning the size of the rebar is 1/8 the thickness of the slab. For example, a slab that is 6 inches thick might have rebar marked as size 6 or 3/4-inch. Slabs for septic tanks may require the use of both welded wire fabric and rebar.
Do I need gravel under my 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.
Which is better rebar or wire mesh?
Considering the support constraint, rebar is undoubtedly stronger than wire mesh. Several constructors consider rebar for domestic jobs. For thicker driveways and locations that involve greater traffic, rebar is always a good option to consider.
Can I pour a 2 inch concrete slab?
If done properly, new concrete can often be poured right over an existing slab. For this to be feasible, the contractor needs to pour at least 2 inches thick, use smaller aggregate, and incorporate reinforcement such as welded wire mesh or fiber mixed into the concrete.
Why do you put plastic under a concrete slab?
The sand layer cannot dry downwards by vapor diffusion because of the plastic sheet—it is a vapor barrier after all. In fact that's why we have it under the slab. ... ** We want to prevent water vapor from coming up from the ground into the concrete slab.
Should I put a vapor barrier under my shed?
Your shed does not need moisture or vapor barrier unless you plan to heat or cool it. The plastic should be 6 mil poly, but 10 mil to 20 mil is better. If you heat your shed, the barrier goes on the inside of the wooden frame. If you cool your shed, the moisture barrier goes on the outside of the building.
Do I need a membrane under concrete?
These days, damp proof membranes are required in the construction of all new buildings to prevent rising damp. These strong and highly durable Polyethylene 1200 Gauge DPMs are sandwiched between the hard core and concrete slab to form an impermeable layer.
Can water come up through a concrete slab?
However, concrete is porous. No, water isn't going to soak up like a sponge, but concrete does allow water to seep through when there is enough. Concrete also cracks, and those cracks will be the first routes of seeping water as it leaks through the slab.
Can water come up through concrete floor?
Concrete is a naturally very porous material and water can rise up or travel through capillaries which can lead to damp floors and mould issues. ... Most often these problems can be solved by repairing the source of the moisture and taking the necessary steps to help the damp floor to dry out.
Should I put landscape fabric under pavers?
Some patio builders favor deterring weeds with a layer of landscape fabric, positioned at the bottom of the bed, under the gravel or between the gravel and sand layers. ... Further, nonporous and even porous plastic fabric can interfere severely with water drainage, making pavers slippery and washing away supporting sand.
Can I just lay pavers on dirt?
While a permanent installation requires excavating soil and a compacted base of gravel and sand to ensure a long-lasting, level patio, you may only need the space for a season or two. A temporary installation of patio pavers on dirt may suffice until you're ready to install the hardscape in a long-range landscape plan.
Should you put plastic under paving?
First and foremost, NEVER use plastic sheeting when laying concrete paving. Many contractors use plastic sheeting thinking that it rids the problem of weeds growing between the paving. It doesn't as seeds will still blow in and settle themselves in the grouting joints where it will grow.
How many inches of sand do I need for pavers?
Should I compact sand before laying pavers?
Before laying the pavers, a layer of bedding sand is placed over the compacted base material. This layer provides a bed into which the pavers are set. The sand bedding also helps to protect the sand joints from being eroded away. ... This process ensures a uniform layer of sand one inch thick.
Can you lay slabs on sharp sand?
Adding sharp sand It holds just as firm as cement and still allows water to escape beneath. When laying a patio on sharp sand, it's also very simple to work out how thick the layer of sharp sand needs to be – it's just the difference between the turf level around it, and the thickness of your patio slabs.
Can you put too much sand under pavers?
Pro Tip: It's very important that you lay no more than 1” of bedding sand. Any more will promote settling or wobbling—two things you don't want pavers to do.