{ "type": "produit", "lang": "en", "translation_of": "covatherm-light", "slug": "covatherm-light", "title": "CovaTherm Light", "status": "publish", "seo": { "titre_seo": "CovaTherm Light Reflective Solar-Control Coating for Skylights | Covalba", "meta_description": "CovaTherm Light, the reflective solar-control coating for skylights. This skylight coating blocks UV and heat on polycarbonate skylights and barrel-vault rooflights, keeping 65% of natural light.", "canonical": "https://www.covalba.fr/en/solutions/covatherm-light" }, "fiche_produit": { "product_name": "CovaTherm Light", "tagline": "Reflective Solar-Control Coating for skylights that blocks the heat without stealing the light.", "accent_color": "#0d3840", "garantie": "5 to 8 years", "sri": "", "prix": "On quote" }, "sections": [ { "layout": "hero", "origine": "ProductHeroCovaThermLight", "variante": "standard", "eyebrow": "Reflective solar-control coating for skylights", "titre": "CovaTherm Light", "lead": "High-reflectivity white acrylic skylight coating from Covalba. Brushed or sprayed onto your polycarbonate or polyester skylights, barrel-vault rooflights and light wells, it filters UV, infrared and glare while keeping up to 65% of natural light.", "image": { "path": "assets/produits/covatherm-light-hero.webp", "alt": "Application of CovaTherm Light UV-protective coating on a polycarbonate skylight" }, "stats": [ { "value": "-5°C", "label": "Under the skylights" }, { "value": "65%", "label": "of light preserved" }, { "value": "10 to 20%", "label": "less cooling energy" } ], "badges": [ { "texte": "98% of UV filtered" }, { "texte": "65% of light preserved" }, { "texte": "5 to 8 years" } ], "cta_primaire": { "label": "Request a quote", "lien": "/en/diagnostic", "style": "primary" }, "cta_secondaire": { "label": "Download the spec sheet", "lien": "#specs", "style": "secondary" } }, { "layout": "texte_image", "origine": "CovaThermLightShowcase", "entete": { "badge": "Positioning", "titre": "CovaTherm Light, *the non-opacifying solar-control coating.*" }, "contenu": "

The reflective solar-control coating for skylights and surfaces that cannot be painted opaque white without losing natural light. It selectively filters UV and infrared while letting the visible spectrum through.

  1. Polycarbonate — skylights, barrel-vault rooflights, modern dome skylights.
  2. Translucent polyester — barrel-vault rooflights and older dome skylights.
", "image": { "path": "assets/produits/Covalba-CovaTherm-Light-Produit.webp", "alt": "Covalba CovaTherm Light solar-control coating in pails, for polycarbonate skylights" }, "position_image": "droite", "note": "Are your skylights creating an overhead-heat effect in summer? Our technician runs an on-site diagnosis.", "cta": { "label": "Request a quote", "lien": "/en/diagnostic", "style": "primary" } }, { "layout": "avant_apres", "origine": "CovaThermLightBeforeAfter", "entete": { "badge": "Before / after", "titre": "Comfort, *before and after CovaTherm Light.*", "intro": "Drag the handle to compare the atmosphere under a polycarbonate skylight before and after applying the solar-control coating. Natural light is still there, but glare and radiant heat are gone." }, "image_avant": { "path": "assets/produits/covatherm-light-avant.jpg", "alt": "Untreated skylight: plenty of light but glare and radiant heat over the workstations" }, "image_apres": { "path": "assets/produits/covatherm-light-apres.jpg", "alt": "Skylight treated with CovaTherm Light: natural light preserved, glare eliminated, an average gain of 5°C" }, "legende_avant": "Before. Light is abundant, but the translucent material causes glare and heat. The workstations below it are uncomfortable.", "legende_apres": "After. Light is preserved, glare is gone and heat is blocked. An average gain of 5°C under the treated surfaces." }, { "layout": "compatibilite_supports", "origine": "CompatibilityTabsCovaThermLight", "entete": { "badge": "Compatibility", "titre": "Compatible substrates *with CovaTherm Light.*", "intro": "A solar-control coating only delivers on its promise if it bonds durably to the translucent substrate without blocking its light. Every project starts with a preliminary diagnosis, to be entrusted to a professional applicator." }, "supports": [ { "type": "Polycarbonate", "detail": "The predominant material on modern skylights and barrel-vault rooflights, highly sensitive to UV. Core target.", "image": { "path": "assets/produits/compat-polycarbonate.webp", "alt": "Illustration Polycarbonate" } }, { "type": "Translucent polyester", "detail": "Used on barrel-vault rooflights and some older dome skylights.", "image": { "path": "assets/produits/compat-polyester.webp", "alt": "Illustration Translucent polyester" } }, { "type": "Translucent fiberglass", "detail": "Compatibility confirmed after an on-site technical diagnosis.", "image": { "path": "assets/produits/compat-fibre-verre.webp", "alt": "Illustration Translucent fiberglass" } }, { "type": "Glazing", "detail": "Glass, glass roof, sunroom: a bonded interior solar film is the appropriate solution, not the solar-control coating.", "image": { "path": "assets/produits/compat-vitrage.webp", "alt": "Illustration Glazing" } } ], "note_couverture": "CovaTherm Light is formulated for the translucent materials used in building roofing.\nFor the opaque part of your roof, see our CovaTherm reflective roof coating.", "rendu": "tabs" }, { "layout": "specs_techniques", "origine": "CovaThermLightSpecs", "entete": { "badge": "Technical specifications", "titre": "The specifications *of CovaTherm Light.*", "intro": "High solar-reflectivity acrylic resin, applied by roller or airless sprayer, preserving the translucency of the substrate. CovaTherm Light is the skylight coating built for translucent roof surfaces, where an opaque reflective coating cannot be applied." }, "colonnes_specs": [ { "nom": "CovaTherm Light" } ], "lignes_specs": [ { "label": "Technology", "valeurs": [ { "texte": "High-reflectivity acrylic resin" } ] }, { "label": "Substrates", "valeurs": [ { "texte": "Dome skylights, skylights,\nbarrel-vault rooflights\nin polycarbonate or polyester" } ] }, { "label": "UV rejection", "valeurs": [ { "texte": "Up to 98% of UV filtered" } ] }, { "label": "Solar energy rejected", "valeurs": [ { "texte": "75%" } ] }, { "label": "Natural light preserved", "valeurs": [ { "texte": "Up to 65%" } ] }, { "label": "Coating system", "valeurs": [ { "texte": "200 g/m²\n(1 to 2 coats)" } ] }, { "label": "Maintenance coat to plan within", "valeurs": [ { "texte": "5 to 8 years\non a sound substrate" } ] }, { "label": "Enhanced protection against soiling", "valeurs": [ { "texte": "yes" } ] }, { "label": "CEE subsidy", "valeurs": [ { "texte": "Not eligible" } ] } ], "colonne_mise_en_avant": 1 }, { "layout": "certifications", "origine": "CovaThermLightCertifications", "entete": { "badge": "Certifications", "titre": "Certifications and *compliance.*", "intro": "CovaTherm Light fits within the regulatory framework for industrial and commercial buildings, with a low-environmental-impact formulation and compatibility with recent thermal requirements. As the solar-control coating is not an opaque roofing finish, the CEE BAT-EN-112 subsidy does not apply to this product." }, "items_certifications": [ { "nom": "CSTB technical assessment", "description": "Reference document for installation in France on polycarbonate and polyester substrates." }, { "nom": "RE2020", "description": "Compatibility with the thermal requirements of new and renovated buildings." }, { "nom": "Tertiary Decree", "description": "Contributes to the mandatory energy-saving targets for the commercial building stock." }, { "nom": "Low-VOC formulation", "description": "Compliance with the environmental requirements of certified buildings and sensitive facilities." }, { "nom": "Certified UV filtration", "description": "Up to 98% of UV filtered, slowing the yellowing and degradation of polycarbonate." }, { "nom": "Formulated in France", "description": "Covalba product formulated and manufactured in France, pioneer in cool roofing since 2018." } ] }, { "layout": "grille_cards", "origine": "CovaThermLightAdvantages", "entete": { "badge": "Advantages", "titre": "The advantages of the UV-protective coating *for polycarbonate CovaTherm Light.*", "intro": "Applying CovaTherm Light to your skylights transforms your building's interior atmosphere from the very first summer: radiant heat disappears, glare stops, but natural light remains. Here are the six benefits observed on projects." }, "cards": [ { "icone": "sun", "titre": "Natural light preserved", "texte": "Filters UV and infrared, retains up to 65% of visible light. Your teams work in daylight, with no glare or overheating." }, { "icone": "thermometer-sun", "titre": "Overhead-heat effect eliminated", "texte": "Removes the sensation of discomfort under skylights, responsible for headaches, dizziness and reduced alertness. The workstations become usable again in summer." }, { "icone": "shield-check", "titre": "Reduced eye strain", "texte": "Reduces the glare that forces your teams to squint or wear sunglasses indoors. A direct benefit for concentration and the prevention of vision problems." }, { "icone": "snowflake", "titre": "Measurable thermal gain", "texte": "Up to 5°C cooler on average under the treated surfaces, with no additional air conditioning. Rejects 75% of solar energy." }, { "icone": "clock", "titre": "Extended skylight lifespan", "texte": "Blocks the UV that yellows and weakens polycarbonate. Pushes back skylight replacement by several years." }, { "icone": "euro", "titre": "Reduced electricity bill", "texte": "Air-conditioning consumption reduced by 10 to 20% depending on the activity, thanks to the elimination of localized overheating under the translucent elements." } ], "colonnes": "2", "theme": "sombre" }, { "layout": "tableau_comparatif", "origine": "CovaThermLightComparison", "entete": { "badge": "Comparison", "titre": "Solar-control coating or *skylight replacement?*", "intro": "The choice between CovaTherm Light and a full skylight replacement comes down to the age of the translucent elements, how degraded they are and your budget. Here are the criteria that matter." }, "entetes_colonnes": [ { "texte": "CovaTherm Light" }, { "texte": "Skylight replacement" } ], "lignes_comparatif": [ { "cellules": [ { "texte": "Project duration" }, { "texte": "1 to 3 days" }, { "texte": "1 to 3 weeks" } ] }, { "cellules": [ { "texte": "Natural light preserved" }, { "texte": "up to 65%" }, { "texte": "Full (new skylights)" } ] }, { "cellules": [ { "texte": "Anti-heat effect" }, { "texte": "-5°C on average" }, { "texte": "Depending on the model chosen" } ] }, { "cellules": [ { "texte": "UV filtration" }, { "texte": "Active for 8 to 10 years" }, { "texte": "If UV additives included" } ] }, { "cellules": [ { "texte": "Waterproofing" }, { "texte": "Unchanged" }, { "texte": "New seals" } ] }, { "cellules": [ { "texte": "Downtime" }, { "texte": "None" }, { "texte": "Partial" } ] }, { "cellules": [ { "texte": "Lifespan" }, { "texte": "8 to 10 years" }, { "texte": "15 to 20 years" } ] }, { "cellules": [ { "texte": "Average ROI" }, { "texte": "Short" }, { "texte": "Long" } ] } ], "colonne_mise_en_avant": 1, "texte_apres": "CovaTherm Light is the right call when skylights are still structurally sound but cause thermal and light discomfort. For barrel-vault rooflights that are heavily yellowed, deformed or near the end of their life, replace the affected elements first, then coat the rest. For the opaque part of your roof, the CovaTherm reflective roof coating finishes the job.", "cta": { "label": "Request a quote", "lien": "/en/diagnostic", "style": "primary" } }, { "layout": "faq", "origine": "ProductFAQCovaThermLight", "entete": { "badge": "FAQ", "titre": "Your questions about CovaTherm Light", "intro": "A question not covered here? Call us or request a quote." }, "questions": [ { "question": "CovaTherm Light or CovaTherm: how to decide?", "reponse": "CovaTherm is an opaque reflective roof coating, built for the solid part of your roof (bitumen, steel deck, concrete, tiles). CovaTherm Light is a non-opacifying solar-control coating, made for polycarbonate or polyester skylights, barrel-vault rooflights and light wells. The two products do not compete, they complement each other: on a building with both an opaque roof and translucent surfaces, the two often go on in the same project to cover the whole roof." }, { "question": "How much natural light remains after application?", "reponse": "Up to 65% of natural light is preserved, depending on the condition and level of translucency of the substrate before treatment. Your building retains enough light input to remove or reduce artificial lighting during the day, while eliminating the glare and radiant heat that disturbed the workstations below." }, { "question": "Why do skylights cause the overhead-heat effect?", "reponse": "Polycarbonate or polyester skylights are translucent materials that let visible light, UV and infrared all pass through. As soon as the sun strikes vertically, the rays converge directly onto the workstations below and heat people far more intensely than the surrounding air. The typical symptoms are headaches, dizziness, localized hot flushes and a rapid drop in concentration. CovaTherm Light filters UV and infrared at the source, without depriving the building of its natural light." }, { "question": "From what proportion of skylights should the roof be treated?", "reponse": "The more roof surface your skylights occupy, the greater the measurable impact of solar-control treatment on the interior atmosphere. A building with 25% or more of its roof in translucent elements achieves very visible comfort gains after applying CovaTherm Light. Below 20%, it is often more relevant to start by treating the opaque part of the roof with CovaTherm, then complement it with CovaTherm Light if the need remains." }, { "question": "Can CovaTherm Light be applied on glazing or a glass roof?", "reponse": "No. For glass (windows, glass roofs, sunrooms), the aesthetic finish of a solar-control coating applied by brush or sprayer is not satisfactory, and durability over time is lower. For these substrates, a bonded interior solar film remains the recommended solution. CovaTherm Light is specifically designed for translucent polymers (polycarbonate, polyester), which make up the vast majority of skylights and barrel-vault rooflights in industrial and commercial buildings." }, { "question": "Why does CovaTherm Light last 5 to 8 years and not 20 like the other Covalba products?", "reponse": "The substrate determines the lifespan of a coating. CovaTherm 20, CovaSeal 20 and CovaMetal 20 are protected by an anti-UV top coat that lets them last two decades on a stable opaque surface. On polycarbonate, the substrate itself ages under the effect of UV, even when protected by a solar-control coating. After 5 to 8 years, the degradation of the underlying polycarbonate requires a system refurbishment or skylight replacement. An annual rinse with clean water extends the reflective performance during this period." }, { "question": "Ai-je droit à la Prime CEE pour ce chantier ?", "reponse": "Non. CovaTherm Light est une laque solaire appliquée sur surface translucide, elle n'entre pas dans le périmètre de la fiche CEE BAT-EN-112 qui cible les revêtements cool roof sur toitures opaques de bâtiments tertiaires commerciaux équipés d'une PAC. Si vous rénovez à la fois la partie opaque et les lanterneaux de votre toiture, seul le traitement opaque (CovaTherm 20, CovaSeal 20 ou CovaMetal 20) peut être éligible à la Prime CEE selon votre configuration." }, { "question": "Do you need a professional to apply CovaTherm Light?", "reponse": "Yes. Application on skylights presents three specific challenges: the surfaces are often sloped or curved, their load-bearing capacity is low (you do not walk directly on them, you work from gangways or aerial work platforms), and the dosage must be adjusted to preserve translucency without compromising reflectivity. We recommend entrusting the application to a professional applicator familiar with these specific constraints of translucent surfaces, and we provide your installer with detailed application instructions. This is a condition of the manufacturer warranty." }, { "question": "What is the price of a UV-protective coating for polycarbonate per m²?", "reponse": "The price of a professional UV-protective coating for polycarbonate, installed, is calculated by quote, based on three factors: the accessibility of the skylights (technical gangway, aerial work platform, lifeline), their geometry (flat, curved, vaulted) and their condition before application. Compared with a full skylight replacement that runs into hundreds of euros per m², CovaTherm Light remains a particularly cost-effective solution, completed in 1 to 3 days with no interruption of activity." }, { "question": "What maintenance does a solar-control coating require?", "reponse": "CovaTherm Light has self-cleaning properties. We recommend an annual visit and a rinse with water to clear away dust and optimize solar reflection. No chemical product is needed. A visual inspection of the polycarbonate substrate's condition every 2 to 3 years allows early detection of any underlying degradation." } ], "json_ld": true, "cta": { "label": "Free quote", "lien": "/en/diagnostic", "style": "ghost" } }, { "layout": "contenu_seo", "origine": "CovaThermLightEditorial", "intro": "

Reflective solar-control coating for skylights, UV-protective coating for polycarbonate, translucent anti-heat coating, skylight coating: several names for one and the same family of products built to solve one specific problem, the overheating and glare under the translucent elements of a professional roof. Used where an opaque reflective coating cannot be applied, the solar-control coating keeps the upside of natural light and takes the heat out of it.

", "sections": [ { "titre": "How a solar-control coating works: filtering heat without blocking the light", "contenu": "

A solar-control coating works by selective filtration of the solar spectrum. It lets visible light through, which is responsible for the natural light input, and blocks two specific wavelengths that degrade comfort and materials:

By blocking these two bands while letting the visible spectrum through, CovaTherm Light transforms the indoor experience without depriving the building of its natural light. So the substrate keeps what makes it useful (free daylight, savings on artificial lighting) without the drawbacks (radiant heat, glare, accelerated degradation).

" }, { "titre": "The skylights CovaTherm Light was designed for", "contenu": "

CovaTherm Light is the UV-protective coating for polycarbonate suited to the following situations:

For an opaque roof with no translucent elements, the CovaTherm reflective roof coating remains the solution. For glass or glass-roof surfaces, a bonded interior solar film is a better fit.

" }, { "titre": "The budget for a solar-control coating per square meter", "contenu": "

The price of a professional UV-protective coating for polycarbonate, installed, depends mainly on the accessibility of the skylights, their geometry (flat, curved, vaulted) and their condition before application. The price per m² is not public; it is calculated by quote based on the access constraints and the geometry of the translucent elements.

Next to the usual alternatives, CovaTherm Light costs a fraction of the price:

You can estimate the savings of a solar-control coating on your building in a few minutes.

" }, { "titre": "How a project unfolds", "contenu": "

A CovaTherm Light project unfolds in four controlled steps, carried out by a professional applicator following our application instructions.

  1. Technical diagnosis. A technician assesses the condition of the skylights, measures their residual translucency, checks their load-bearing capacity and identifies the most degraded areas. Some heavily yellowed barrel-vault rooflights may require prior replacement rather than a simple treatment.
  2. Preliminary cleaning. The translucent surfaces are cleared of moss, dust and organic deposits that impair light transmission, then rinsed with clean water.
  3. Application by roller or airless sprayer. The acrylic coating is applied in thin, even coats, from a technical gangway or an aerial work platform depending on the configuration. Two cross passes ensure uniform coverage with no runs.
  4. Drying and finishing rinse. A post-drying rinse removes any residue along the edges and stabilizes the final adhesion.

Application is done in dry weather, at moderate temperatures. A typical project is completed in 1 to 3 days depending on the skylight area, with no downtime for the building. We give your installer the safe-working instructions for translucent surfaces and the dosage parameters specific to the product.

" }, { "titre": "UV, the main factor in polycarbonate aging", "contenu": "

Polycarbonate, the predominant material in modern skylights, is particularly sensitive to ultraviolet radiation. Exposed without protection, it undergoes a documented physico-chemical degradation process: progressive yellowing, loss of transparency, the appearance of surface microcracks and a decline in mechanical properties (Redjala et al., 2020). A study conducted on UV-additive and UV+IR-additive polycarbonate skylights showed that the yellowing index can go from near-zero values to significant levels over a period of 21 months of natural exposure, with direct consequences for light transmission and impact resistance (Bakırcı & Kahveci, 2025).

By filtering UV at the source before it reaches the polycarbonate, CovaTherm Light drastically slows this process. Your skylights keep their optical and mechanical properties longer, which pushes back the replacement bill by several years.

" }, { "titre": "Team comfort, the most direct benefit", "contenu": "

In workshops and commercial halls fitted with skylights, the radiant heat under light wells is not a trivial discomfort: it leads to a documented drop in concentration, accelerated fatigue and physical symptoms (headaches, dizziness, hot flushes) that degrade both productivity and quality of life at work. Research on reflective roofing strategies also shows that better indoor thermal comfort, even without air conditioning, has a measurable effect on occupant well-being and on the building's energy demand (Santamouris, 2014). So treating the translucent elements of a roof is also an investment in working conditions, not just in energy efficiency.

" } ], "sources": [ { "label": "Redjala, S., Ferouk, N., Chikhi, N., & Aït Hocine, N. (2020). UV Aging Effects on Polycarbonate Properties. Journal of Failure Analysis and Prevention, 20, 1907-1915.", "url": "https://link.springer.com/article/10.1007/s11668-020-01002-9" }, { "label": "Bakırcı, A., & Kahveci, S. (2025). The temporal variation of some physical and mechanical properties of different polycarbonate greenhouse covering materials and the detection of aging using thermal imaging. Case Studies in Thermal Engineering, 74.", "url": "https://doi.org/10.1016/j.csite.2025.106245" }, { "label": "Santamouris, M. (2014). Cooling the cities — a review of reflective and green roof mitigation technologies to fight heat island and improve comfort in urban environments. Solar Energy, 103, 682-703.", "url": "https://doi.org/10.1016/j.solener.2012.07.003" }, { "label": "Akbari, H., Berdahl, P., Levinson, R., Wiel, S., Miller, W., & Desjarlais, A. (2005). Aging and Weathering of Reflective Roofing Membranes. Lawrence Berkeley National Laboratory / U.S. Department of Energy.", "url": "https://www.osti.gov/servlets/purl/860745" } ], "replie": false }, { "layout": "cta", "origine": "CTASection", "variante": "final", "titre": "What will it cost to coat your roof?", "texte": "Get a tailored estimate for your project in under 48h. We reply within 24h, no commitment.", "cta_primaire": { "label": "Request a quote", "lien": "/en/diagnostic", "style": "primary" }, "cta_secondaire": { "label": "Estimate my budget", "lien": "/en/estimation", "style": "secondary" } }, { "layout": "grille_solutions", "origine": "RelatedProductsCovaThermLight", "entete": { "badge": "Autres solutions", "titre": "Découvrez également" }, "produits": [ "covatherm", "covaseal-20", "covametal-20" ], "affichage": "cards" }, { "layout": "texte_image", "origine": "ApplicatorsSection", "entete": { "badge": "Réseau d'applicateurs", "titre": "Devenez applicateur cool roof certifié" }, "contenu": "

Vous êtes pro de la toiture ou de l'étanchéité ? Rejoignez le réseau : formation, accompagnement, produits en direct fabricant.

", "liste": [ { "texte": "Formation à l'application de nos produits cool roof certifiés" }, { "texte": "Accompagnement technique et commercial dédié" }, { "texte": "Produits en direct fabricant aux meilleures conditions" } ], "image": { "path": "remote/9a4cb6d18cee.jpg", "alt": "Devenir applicateur Cool Roof Covalba" }, "position_image": "droite", "cta": { "label": "En savoir plus", "lien": "/devenir-applicateur", "style": "secondary" } } ] }