Category Archives: Solar Thermal Technology

What Contractors Should Know When Buying Metal Roofing Coil

Contractors looking for a good deal on galvanized steel and aluminum roofing coil should always be careful—if it looks too good to be true then it probably isn’t.

There are some tools and “rules of thumb” for them to be sure they’re at least getting what they paid for.

Contractors order metal roofing coil by the square foot and most, in turn, charge their clients the same way.

So the number of square feet a coil is going to yield will dictate how much they are going to pay and how much they are going to earn.

There are a few unknowns in the process. Let’s use 24 gauge steel coil as our example. One coil of 24 gauge material can be different from another. That’s because industry standards permit “tolerances” in what constitutes a 24 gauge thickness. For example, we’ve know of one widely used “standard” that allows the thickness of 24 gauge galvanized steel to be anywhere from .0236 to .0316 inches thick. We know another one that only allows it to be from .0236 to .0296. A lot of contractors know this and realize that the yield of a coil may differ to some degree based on those tolerances. The only way to figure how many square feet the coil will accurately yield is to use a micrometer to measure the thickness of the material. And only a handful of large contractors and distributors have micrometers. Continue reading

New Solar Thermal Technology Saves Install Labor and Boosts Heat Output from Solar Thermal Standing Seam Metal Roof Systems

In an earlier blog this month, we talked about rooftop solar systems integrated with standing seam roofs.  We noted that the most widely employed rooftop solar technology isn’t electric, it’s solar thermal for heating air and hot water. We discussed four different systems, including an under the roof technology that takes heat from the metal roofing components and heats a water/glycol mixture that is circulated through cross-linked polyethylene tubing attached to a structure of purlins that are laid down piece by piece across the roof sheathing.Solar Thermal Install Thermal Lock Module

Well, since our blog appeared, a new under the roof technology has been emerging that uses the same heat principal but eliminates a lot of the manual labor, time and cost using the old system.

Known informally as the thermal lock module, this new under-the roof-system replaces complex 300 to 500 foot warrens of interlocking components of purlins, tubing, insulation material and aluminum foil with four by eight foot modules factory-fabricated and ready to install. Each module is 1 ½-inch thick and is connected to another by a simple coupling, eliminating a lot of the components and labor needed to install older systems.

The modules are installed as quickly as you would install a piece of plywood sheathing on a roof. It takes less than five minutes to couple them together.

There’s no need for the foil or foam and the system’s creator contends the new glycol system harvests two to three times more BTUs than the older glycol-based ones. In a recent in-plant test with 40 gallons of water, the creators say a single module was able to heat the temperature of the water from 50 degrees F in the morning to 105 degrees F in the afternoon. The new system must still undergo testing at the SRCC™, the non-profit organization which provides authoritative performance ratings, certifications and standards for solar thermal products required in most government and many commercial solar contracts. And its producer will only provide the factory made modules with plans to connect them to a manifold. But a certified solar installer must hook it up to the heating system.

Nonetheless, it appears to be a major step forward in under the roof solar thermal technology and one worth watching for architects, contractors and builders interested in marrying standing seam metal roofs with solar thermal installations.

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