{"id":71806,"date":"2025-09-07T14:27:00","date_gmt":"2025-09-07T11:27:00","guid":{"rendered":"https:\/\/www.peyzax.com\/?p=71806"},"modified":"2026-02-21T21:21:29","modified_gmt":"2026-02-21T18:21:29","slug":"fighting-the-urban-heat-island-selecting-light-colored-aggregates-and-surface-materials","status":"publish","type":"post","link":"https:\/\/www.peyzax.com\/en\/fighting-the-urban-heat-island-selecting-light-colored-aggregates-and-surface-materials\/","title":{"rendered":"Fighting the Urban Heat Island: Selecting Light-Colored Aggregates and Surface Materials"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">H\u0131zl\u0131 Git<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-69f20c7097ba1\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #ffffff;color:#ffffff\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #ffffff;color:#ffffff\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-69f20c7097ba1\" checked aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.peyzax.com\/en\/fighting-the-urban-heat-island-selecting-light-colored-aggregates-and-surface-materials\/#Why_%E2%80%9CLight-Colored%E2%80%9D\" >Why \u201cLight-Colored\u201d?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.peyzax.com\/en\/fighting-the-urban-heat-island-selecting-light-colored-aggregates-and-surface-materials\/#The_Aggregate_Question_Limestone_Granite_or_Basalt\" >The Aggregate Question: Limestone, Granite, or Basalt?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.peyzax.com\/en\/fighting-the-urban-heat-island-selecting-light-colored-aggregates-and-surface-materials\/#The_Nuances_of_Light_Color_in_Cold_Climates_Like_Erzurum\" >The Nuances of Light Color in Cold Climates Like Erzurum<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.peyzax.com\/en\/fighting-the-urban-heat-island-selecting-light-colored-aggregates-and-surface-materials\/#%E2%80%9CColor_Alone%E2%80%9D_Is_Not_Enough_A_Three-Way_Alliance_with_Shade_Wind_and_Water\" >\u201cColor Alone\u201d Is Not Enough: A Three-Way Alliance with Shade, Wind, and Water<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.peyzax.com\/en\/fighting-the-urban-heat-island-selecting-light-colored-aggregates-and-surface-materials\/#Pavement_Systems_Thin-Coat_Paint_or_an_Integrated_Solution\" >Pavement Systems: Thin-Coat Paint or an Integrated Solution?<\/a><\/li><\/ul><\/nav><\/div>\n\n<p>When you walk down the street, the ground beneath your feet is the quietest counterpart of the light drifting down from the sky. Sometimes it reminds you how a black T-shirt heats up under the summer sun, sometimes it recalls the calm coolness of a white shirt. In cities, the phenomenon we call the \u201curban heat island\u201d is built on exactly these simple differences: surfaces either absorb light or send it back. What I have observed most often in the field is this: the color and texture of the ground is not merely an aesthetic choice; it can have a decisive influence on pedestrian comfort, energy consumption, children\u2019s play experience, and even how the late-afternoon breeze is felt.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_%E2%80%9CLight-Colored%E2%80%9D\"><\/span>Why \u201cLight-Colored\u201d?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Let me start with an everyday analogy: in summer, if you park a black car in the shade and a white car in the sun, your willingness to place your hand on the hood changes. Pavements work the same way. Light-colored surfaces have higher reflectance (often referred to as \u201calbedo\u201d); by reflecting a larger portion of incoming solar radiation, they can limit excessive surface heating. This can help reduce the mean radiant temperature felt at pedestrian level and, when combined with shade, can visibly improve the walking experience.<\/p>\n\n\n\n<p>Of course, the effect of light color is not only \u201cheating up less.\u201d Lower surface temperatures can reduce the thermal load a pavement releases back into its surroundings on hot days; this can help cooling start earlier in the evening, especially in densely built-up areas. Although the numbers may vary in the literature, in the field you can feel the difference in thermal behavior between dark asphalt and light-toned surfaces under the sun even by placing your hand on them. Thinking of that sensation accumulated at the scale of the city is enough to convey the magnitude of the picture.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"The_Aggregate_Question_Limestone_Granite_or_Basalt\"><\/span>The Aggregate Question: Limestone, Granite, or Basalt?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Aggregate is the name given to granular, inorganic materials with different mineral structures\u2014such as sand, gravel, and crushed stone\u2014used with cement and water in concrete, mortar, and similar mixes. Aggregates make up roughly 75% of the volume of cementitious systems. In cement-based construction, aggregates are relatively inexpensive materials. With this feature, they reduce overall mix costs. Aggregates also make important contributions to the technical performance of cementitious systems. <a href=\"https:\/\/cimsa.com.tr\/formulhane\/beyaz-cimento\/agrega-nedir-agrega-ozellikleri-nelerdir\/\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">(1)<\/a><\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1300\" height=\"867\" src=\"https:\/\/www.peyzax.com\/wp-content\/uploads\/2025\/08\/acik-renk-yuzey-kaplama-3.png\" alt=\"\" class=\"wp-image-70894\" title=\"\"><figcaption><\/figcaption><\/figure>\n\n\n\n<p>Aggregate is the soul of a pavement. It determines the tone, the texture, and the relationship the surface builds with light.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Limestone and light-colored granite<\/strong> derivatives generally provide higher reflectance. In chip-seal (surface dressing) details, using light-colored aggregate can quickly transform the visual and thermal character of ordinary black asphalt.<\/li>\n\n\n\n<li><strong>Basalt and dark granite<\/strong> can be more durable and harder; however, they are expected to absorb more heat under the sun. While dark stone may support ice melt at a micro scale in winter, it can increase the heat load in summer. This is why a climate-informed balance is needed.<\/li>\n<\/ul>\n\n\n\n<p>When selecting aggregate, not only color but also particle size, porosity, hardness, skid resistance, and freeze\u2013thaw durability should be evaluated together. A light-toned stone that creates a glassy shine on the surface can pose a glare risk at high solar angles. For this reason, it can be wise not to keep the surface too smooth and to disperse reflections through micro-roughness.<\/p>\n\n\n\n<p>Three concepts appear frequently in the technical literature: <strong>albedo<\/strong> (reflectance), <strong>emissivity<\/strong> (thermal emittance), and <strong>SRI\u2014Solar Reflectance Index<\/strong> (an index that evaluates albedo and emissivity together and allows practical comparison). Albedo indicates how much solar radiation a surface reflects; emissivity indicates how effectively, once heated, the surface can re-radiate that heat. SRI translates these two parameters into a \u201ccomparison language,\u201d weighing different materials on the same scale. The SRI value in a catalog should not be the sole decision-maker; but between two candidate materials, it can offer a functional shortcut to the question \u201cwhich one tends to stay cooler under summer heat?\u201d<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1300\" height=\"867\" src=\"https:\/\/www.peyzax.com\/wp-content\/uploads\/2025\/08\/acik-renk-yuzey-kaplama-7.png\" alt=\"\" class=\"wp-image-70890\" title=\"\"><figcaption><\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"The_Nuances_of_Light_Color_in_Cold_Climates_Like_Erzurum\"><\/span>The Nuances of Light Color in Cold Climates Like Erzurum<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>There is one truth years of walking the field in Erzurum teaches you: <strong>winter rewrites design.<\/strong> Although light-colored pavements look very attractive for summer, two effects should be considered in winter. The first is <strong>glare<\/strong>: on a snow-covered day, when the sun appears, bright surfaces can challenge visual comfort and dazzle the eyes. The second is <strong>snow-and-ice dynamics<\/strong>: darker surfaces can absorb more heat and slightly accelerate ice melt, while lighter surfaces may remain more \u201cneutral.\u201d This does not mean \u201clight color is bad\u201d; it simply reminds us that we must think together with the winter season. For example, when <strong>light color + a well-textured surface + the right salting\/cleaning routine<\/strong> are combined, both summer coolness and winter safety can be achieved.<\/p>\n\n\n\n<p>In children\u2019s play areas, I tend to use the following approach: the <strong>play core<\/strong> and the <strong>circulation belt<\/strong> can be handled with different color and texture strategies. A combination of fall-protective surfaces (e.g., colored EPDM or light-toned mineral infills) and light-to-mid-tone, high-friction surfaces in surrounding circulation zones can keep the ground cooler in summer and safer in winter. When it merges with tree shade, the effect becomes more pronounced.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E2%80%9CColor_Alone%E2%80%9D_Is_Not_Enough_A_Three-Way_Alliance_with_Shade_Wind_and_Water\"><\/span>\u201cColor Alone\u201d Is Not Enough: A Three-Way Alliance with Shade, Wind, and Water<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Against the urban heat island, color is a powerful but, on its own, a limited tool. Light-colored pavements need to be supported by active shading (trees, pergolas), airflow (wind corridors), and water cycles (permeable surfaces, rain gardens, evaporative cooling). When a light surface \u201cmarries\u201d shade, pedestrian comfort can increase in a way you immediately feel. A plaza with very high albedo but no shade can still feel \u201cbright yet hot\u201d in midsummer; whereas even a small amount of semi-permeable shade can change the sensation dramatically.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Pavement_Systems_Thin-Coat_Paint_or_an_Integrated_Solution\"><\/span>Pavement Systems: Thin-Coat Paint or an Integrated Solution?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Solutions marketed as \u201ccooling paint\/coating\u201d and the \u201ccool pavements\u201d approach\u2014where colored aggregate is integrally bonded within the system\u2014are different. Thin-film coatings may deliver high albedo at the beginning; however, performance can decline over time due to <strong>soiling, abrasion, and UV<\/strong>. When the aggregate itself is light-colored, the tone comes from the body of the material, so the service life can remain more consistent. Even small steps in the maintenance plan\u2014such as annual cleaning or periodic pressure washing\u2014can help keep performance alive.<\/p>\n\n\n\n<p>We do not have to imagine light color as \u201cpure white.\u201d The human eye is usually less disturbed by matte, natural stone tones. That is why the <strong>off-white, beige, and light gray<\/strong> family is often more balanced in terms of both thermal performance and visual comfort. Shaping surface texture with micro-roughness that scatters the sun\u2019s angle; avoiding glossy, glassy reflections is a good principle. In children\u2019s play areas, colored patterns (play cues, ground graphics) can be solved with calm, low-glare contrast palettes rather than excessive brightness.<\/p>\n\n\n\n<p>Light-colored pavements are sometimes chosen with an expectation of a \u201csmooth look,\u201d but safety comes before aesthetics. Slip resistance in rain and ice (micro\/macro roughness) and compatibility with wheeled mobility such as strollers and wheelchairs must be tested. Aggregate size and binder ratio influence both friction and vibration comfort. For that reason, in children\u2019s spaces I often suggest different particle sizes and different binder ratios between the \u201cplay surface\u201d and \u201cparent circulation.\u201d A small distinction can create a large comfort difference.<\/p>\n\n\n\n<p>In fighting the urban heat island, looking at the price tag alone can be misleading. It should be approached through a life-cycle lens: initial construction cost + maintenance + renewal period. A permanent tone that comes from light-colored aggregate can be more stable over time than the first brightness achieved by paint. Adding a periodic light cleaning program for surface soiling and oil stains helps spread performance over the years. Writing this plan from the start reduces surprises.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1024\" height=\"1024\" src=\"https:\/\/www.peyzax.com\/wp-content\/uploads\/2025\/08\/acik-renk-yuzey-kaplama-2.png\" alt=\"\" class=\"wp-image-70886\" title=\"\"><figcaption><\/figcaption><\/figure>\n\n\n\n<p>Choosing light-colored aggregate and pavements may look like a small detail at first glance in the fight against the <strong><a href=\"https:\/\/www.peyzax.com\/kentsel-isi-adasi-etkisi-peyzaj-mimarliginin-rolu\/\" target=\"_blank\" rel=\"noreferrer noopener\">urban heat island<\/a><\/strong>, yet it can build a bridge between daytime coolness and the evening breath of a city. I like to design that bridge by placing color next to shade, texture next to safety, and surface choices next to a discipline of maintenance. Perhaps the point is not to make the ground \u201csnow white,\u201d but to create a <strong>matte calmness<\/strong>\u2014at peace with the summer sun, measured with winter snow, gentle for children\u2019s knees yet firm underfoot. Remembering that the coolness we seek in the heart of cities is often right beneath our feet is sometimes enough.<br><\/p>\n","protected":false},"excerpt":{"rendered":"<p>When you walk down the street, the ground beneath your feet is the quietest counterpart of the light drifting down from the sky. Sometimes it&#46;&#46;&#46;<\/p>\n","protected":false},"author":65,"featured_media":70897,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_wp_rev_ctl_limit":""},"categories":[5311,5313,4948,5312],"tags":[],"class_list":["post-71806","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-climate-change","category-ecological-design","category-editors-pick","category-sustainability"],"_links":{"self":[{"href":"https:\/\/www.peyzax.com\/en\/wp-json\/wp\/v2\/posts\/71806","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.peyzax.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.peyzax.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.peyzax.com\/en\/wp-json\/wp\/v2\/users\/65"}],"replies":[{"embeddable":true,"href":"https:\/\/www.peyzax.com\/en\/wp-json\/wp\/v2\/comments?post=71806"}],"version-history":[{"count":0,"href":"https:\/\/www.peyzax.com\/en\/wp-json\/wp\/v2\/posts\/71806\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.peyzax.com\/en\/wp-json\/wp\/v2\/media\/70897"}],"wp:attachment":[{"href":"https:\/\/www.peyzax.com\/en\/wp-json\/wp\/v2\/media?parent=71806"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.peyzax.com\/en\/wp-json\/wp\/v2\/categories?post=71806"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.peyzax.com\/en\/wp-json\/wp\/v2\/tags?post=71806"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}