June 27, 2013 6 Comments
This question comes up frequently on the DeckAdvisor.com blog so I thought it would make sense to address the issue as a separate topic. My own clients ask me if one deck board is going to be cooler than another quite a bit, too.
No independent lab or authority does temperate testing that compares Brand X board versus Brand Y board to determine the heat they absorb under normal summer sunlight so unfortunately, there is no quantitative scientific data to fall back on. I may try to do some testing myself on the major brands and publish the results in Professional Deck Builder magazine in the future–we shall see.
First, let’s set a reasonable expectation for what dictates “too hot to walk on” with bare feet. I don’t know what the answer is but I can tell you that a toddler is probably going to have a lower tolerance than a 35 year old who walks on the beach frequently. Personally, I have walked on many surfaces with bare feet that were uncomfortable from sand, to wood, to concrete because it was just plain hot outside! People seem to forget that when it’s 105 degrees at 2PM and the sun is blasting, it’s not really a pleasant time to be outside–regardless of what you are walking or sitting on. A modern man made deck surface seems to be held to a higher standard than other products for some reason that I can’t quite put my finger on.
A deck’s surface temperature is a factor of the heat the deck boards absorb and retain. Much of this absorption is relative to the board’s color. A dark color will absorb more than a light color–it’s physics. For example, under the same conditions, Trex Vintage Lantern (perhaps the darkest deck board color going) is going to feel hotter under foot than Trex Rope Swing (a tan, sand color). This is not to say Rope Swing will be cool to the touch, but comparatively, it will be cooler than Vintage Lantern. Heck, if you painted a plain old pressure treated deck board the same color as Vintage Lantern, I bet it would be pretty darn hot too!
No man made deck boards are designed from the ground up to be remain cool in the heat. It’s just not something that the manufacturer’s focus on at this point.
So…the definitive is answer I can give you is this:
When the sun is blasting your deck (or patio, or driveway, or lawn) it’s probably going to be hot and not pleasant. Lighter colors are usually a little cooler than darker colors.