Placing tubing too deep in the slab will increase response time, which means it will take longer for the floor to reach the desired temperature, will result in increased BTU load, require more energy and possibly will require larger tubing diameter.Optimal depth of PEX tubing in the thick slab is considered to be in the 1-2" range and, whenever possible, should not be deeper than 4" for the following reasons: The main downside is that the sheets have to be tied together. They are noticeably easier to install and provide a flatter surface. If using welded wire mesh, you may want opt for sheets rather than rolls whenever possible. Unless special design considerations require otherwise, the tubing should always be positioned on top of the reinforcement, in order to stay closer to the surface of the slab. While reinforcement itself does not affect the radiant floor heating system, it determines placement of the PEX tubing in the slab, which in itself is an important factor. Non-reinforced slabs – where no reinforcement is added.Reinforced slabs – where welded wire mesh or rebar is used to reinforce the slab.Thick slabs are concrete slabs with an overall thickness of 4-6" or greater and can be either grade level (slab on grade) or below grade (i.e. Types of concrete slabs with radiant floor heating Thick slabs So even if there are no existing plans for the radiant floor heating or a snow melting system, installing PEX tubing in it may turn out to be a good decision. Remember, since you will only have 1 chance to pour the concrete slab, you will only have 1 chance to put the PEX tubing in it. Basic materials for radiant floor heat installation in a slab.Typical PEX installation process in a slab. Common pitfalls in installing slab radiant heating and how to avoid them.
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