One of the most popular retrofits and new construction pex radiant applications is placing PEX under the main living space of a home or business. The images below will show various methods for installing pex - click on the image to see more detail
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Hydronic Radiant Heating PEX Tubing and Accessories
Quantity X - Hydronic Radiant Heat Pex Tubing and Accessories
Quantity X - Low-E Reflective Foil Insulation for Radiant Heating
Quantity X - Slide Brackets for PEX Tubing
Quantity X - PEX Radiant Heating Manifolds
Quantity X - PEX Tubing Accessories
X = Various Amounts of Product needed - dependant on actual system
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A pex radiant floor heating system can be the most comfortable, efficient and often may be installed for less than other heat delivery hydronic systems. Radiant floor heat stratifies the heat from the feet to the head. The feet are always warmer than the head; this is what feels naturally comfortable to our bodies. Objects that rest on the floor become charged as well, magnifying the effect. This allows us to run lower temperatures when compared to a forced air system or hydronic baseboard heaters
You should always check with your builder or architect for a suggested drilling location, for your floor. The process begins by drilling the necessary holes, positioning the manifold in a central location and attaching the first run to the manifold. A PEX un-coiler can make this process much easier. It is critical to uncoil the PEX in a linear fashion, to prevent kinking.
This floor layout shows 4 loops attached to one manifold. Here the manifold is placed in the center of the floor, making it easy to keep our loop lengths even. Typical loop lengths are set at 200 feet to 300 feet maximum, keeping the distance to the circulator as part of the maximum loop length. At HouseNeeds we can specify the tubing needed for a particular application.
Using an extruded plate, very thick and positively holds the PEX in a crescent shaped track. Extuded plates quicken the response times for the floor and distribute the heat evenly across the floor. The extruded heat transfer plates will transfer heat a little better than stamped plates due to the mass of the extruded plates. Also, the PEX tubing will be held in place better and thus will be quieter.
Using an Stamped Aluminum Plates, are thiner than our extuded plates but will still given quicker the response times for the floor and distribute the heat evenly across the floor. The extruded heat transfer plates will transfer heat a little better than stamped plates due to the mass of the extruded plates. PEX tubing will not be held as well as with extuded plates - so you must besure that the PEX is straight in and out of the plates to reduce noise.
Slide brackets are ideal for retrofits where nails protrude down or there is a concern about heat transfer plate noise. Slide brackets cost less than heat transfer plates and allow higher water temps. The PEX tubing is positioned under the floor on slide brackets, 8 Inches on center with in 16 Inches on center joists. The brackets allow the PEX to be placed just below the floor, so it does not touch and then zip ties hold things firmly in place.
Protection sleeve should be used to prevent chafing of the oxygen barrier on the PEX. The sleeve is split and is positioned after the PEX is installed. Here we see the back run of the first loop and two joist bays with in one loop.
The PEX is in place and insulation is stapled below the tubing. We recommend Low-e Foil Insulation
Radiant Floor Foil Insulation is highly recommended with under floor radiant. The insulation should be placed at least 4 inches below. The goal is air stagnation, allowing heat to rise. Placing the foil faced foam closes the space and send the heat up. Note: The homeowner has kept all wiring below, preventing the heating of the wires.
The PEX manifold feeding the floor is in the center span in this house. Placing the manifolds in a central location allow the loops to stay with in recommended lengths and reach all parts of the house. Typical loop lengths fro 1/2 inch Tubing is set at 200 feet to 300 feet, keeping the distance to the circulator as part of the maximum loop length.
Under floor radiant install with Heat Transfer Plates. Notice the Pink Board used on the perimeter space.