Assuming they have not changed anything since I last saw them,
Their products are OK, but I they speak with the mouth of a true
advertiser. In other words, they make it all sound a lot better than
it really is.
It does not really "block" the heat it has to reflect or absorb the
heat. Reflection (generally light colored or metallic materials) will
reflect much of the heat back towards the source, but some will be
absorbed and some of that will end up where you don't want it, so that
80% number is usually optimum and the real life number would be
Again, my experience, some years ago, was that it was a good
product, better than most, but not great.
I dont have that particular brand, but I recently went to Lowes and
bought some sun screen for my existing screens.
The screening material is a thicker, strand finer mesh screen. AKA, it
has smaller holes in it. This has 3 side effects.
First, you cant see out of it as well.
Second, it lets in less air when the window is open
Third, when it rains, and water hits it, it holds the water much
longer than a normal screen and you cant see out at all for several
Other than that, the windows I installed it in do indeed let in less
light, and the room is much cooler.
I had it installed years ago by an authorized contractor across the side of
the house that gets the afternoon sun. High quality material, tear resistant
and still looks new. The down side is it blocks some of the outside light
and view. My old screen had a better view to the outside. It also block some
of the heat but not as much as I had anticipated from the hype.
All "shadecloth" is rated at % of blocking the sun. The % of blocking the
heat would, in my opinion, could only be more if a reflective thread, or
some heat conductive thread were used. Be careful of the doublespeak.
That being said, I have used a lot of shadecloth. In gardens, the 22% is
good because it shades enough that plants that wither in direct sun
flourish. I have made sun shades from the 80% cloth over work and play
areas, and it let in plenty of light, made it a lot cooler, and lessened
harmful UV rays by plain blocking.
The best thing you can do is read up on it and educate yourself, and ask
questions like you are doing. Almost anything you can do to reduce sunlight
shining on a window will be beneficial. You may achieve the same results
with awnings, and not lose any view.
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