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#272583 3-Jul-2020 11:53
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We are looking at composite decking (specifically Outdure ResortDeck), but in the installation instructions I just read the following:


Excessive heat on the surface of Outdure composite decking products from external sources such as but not limited to fire or reflection of sunlight from energy efficient window products. Low-emissivity (Low-E) glass can potentially harm Outdure composite decking products. Low-E glass is designed to prevent passive heat gain within a structure and can cause unusual heat build-up on exterior surfaces. This extreme elevation of surface temperatures, which exceeds that of normal exposure, can possibly cause Outdure composite decking products to melt, sag, warp, discolor, increase expansion/contraction, and accelerate weathering.


Does anyone have any knowledge or experience of this? Is it just them covering themselves? We have Xcel Low E glass and would very much like to have composite decking.

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  #2518250 6-Jul-2020 23:59
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XCel lets in 60% of solar heat versus closer to 80% for plain double glazing. The standard low e glasses used in the USA are designed to let in far less, more like 30%, which may be where this disclaimer originated. If you had a wall of unshaded north facing glass I'd expect XCel would reduce the lifespan of composite decking but it may not be great for other materials too. Walls reflect sunlight too.





Hmm, what to write...
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  #2518286 7-Jul-2020 08:30
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stop worrying so much... low E glass will reflect IR... you don't live in Arizona so the result is higher wavelengths of light will enter your house be converted to IR through warming of your slab etc and then not get back out the windows. The amount of incoming IR reflected off the windows will not harm your deck in our environment.



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  #2518423 7-Jul-2020 11:03
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Thanks @bfginger and @mdooher I appreciate the info and advice. I'm a born worrier, and decks are super expensive!


I hadn't realised that the low e in the US prevented so much more solar gain (thus causes more reflected heat). The warning makes a lot more sense in that context.

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