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These types of staple up systems are rarely used by professional radiant heating companies, particularly when grappling with the design challenge of retaining existing hardwood floors in a home remodel. Professional installers also don’t use these types of systems because of the significant technical and economic downsides.

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Mechanical Operational Costs: Most radiant floor systems utilize a condensing boiler or water heater. The condensing in these heaters, which generate the cost savings, occur below a 135F degree exit temperature. If the radiant system requires temperatures higher than 135F, then the actual heat source efficiency drops to about 85%.

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While the aluminum plates may only cost $1 / sq.ft, installing this type of system properly is extremely labor intensive. It is far easier and faster to install Thermalboard on top of the subfloor rather than beneath it. It’s also more heat efficient.

Compare the performance chart at the bottom of the page for a typical underfloor application with aluminum plates. The underfloor performance difference compared to “above floor” solutions such as Thermalboard are enormous.

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Poor Performance of Staple-Up DIY Systems Thermalboard’s high performance originates from our patented board design. Because our high heat transfer aluminum surface is right next to the floor covering, a lower supply water temperate is required. In contrast, underfloor systems are insulted by the subfloor, which means heat needs to travel through the subfloor layer before finally reaching the surface of the floor. This extra layer results in a significant cost increase, especially over the product lifetime.

The premium price you paid for the condensing heat source is lost and your energy bills will be higher. Underfloor systems often require water temperatures above 135F, further increasing the life cycle cost of your system. Lower temperature equals lower costs — and better comfort!

Underfloor staple up systems are primarily promoted by online radiant heating supply companies serving the DIY market because the system is easy to explain and supply giving the impression of lower cost.

Thermalboard only requires a supply water temperature of 108°F, compared to an underfloor aluminum plate system which requires a whopping 145°F water temperature! Simple physics dictates, the higher the water temperature required to heat a space lowers the efficiency of the radiant heat system significantly.