TOPIC: Energy Efficiency
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I am having my roof replaced - and because it is a 12/12 pitch, high off the ground, it is not going to be cheap. I am debating an upgrade to a Dura Tech 5000 finish on 24 gauge metal panels vs going with the standard 26 gauge with what is called an XL finish but putting down an R 4 Low e Thermal Barrier Insulation. Which would benefit me the most in a climate of hot summers but not very cold winters - I have R19 in the roof as house was built in 1976, and lots of skylights to boot. I do not want to spend the extra for the cool roof finish which only comes on the thicker panels, if the thermal layer would help abt as much. I had originally planned on rigid foam panels under the metal but the cost was rediculous.
On an aside, are the cool roof finishes very shiny - is that how they work? I have seen metal roofs that are blindingly shiny as well as matte looking ones and far prefer the matte finish. However, the cool roof finish on these particular panels only offers a matte black which seems an oxymoron. Are cool roof finishes shinier than standard ones?
The coatings that include heat - reflective pigments are not inherently higher gloss than other finishes. As you look at different colors and finishes, you will find a range of glosses and that range is not related to the reflective pigment.
Well, that is good news as I really do not like the glare from the glossy ones I saw. I have requested samples to see - I am hoping for a grey. However, does that mean a finish that calls itself a cool roof in matte black would keep my insulation cooler even tho it is black? I meant to mention, I have clerestory ceilings but we will have roof vents.
In most cases, any color that says it is "cool" should be at least 25% reflective, which meets the Energy Star definition. Generally speaking, the darker the color, the lower the reflectivity. Reflective black is likely 25 - 27%. A reflective tan may be around 40 - 45% and white is around 65%.
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