On an asphalt membrane, the CovaTherm system goes straight over the existing waterproofing — a light reflective coating that bounces back up to 90% of the sun. The membrane stops running hot, the building stays comfortable, and the waterproofing is shielded from UV. If it is already worn, CovaSeal 20 restores the waterproofing and cools the roof in one pass.
\nThe system goes on most asphalt membranes: bare bitumen, mineral-surfaced (self-protected), and multi-layer. It starts with a look at the waterproofing and the detail points. We clean the roof, fix the detail points if needed, then the primer locks in adhesion before we coat.
", "image": { "path": "assets/produits/compat-bitume.webp", "alt": "" }, "position_image": "gauche" }, { "layout": "etapes", "entete": { "badge": "A safe job", "titre": "It all happens from the ground — no gear hauled onto the roof." }, "etapes": [ { "titre": "Technical check", "texte": "Membrane condition, detail points, thermal targets." }, { "titre": "Prep", "texte": "Pressure-wash and repair the weak spots." }, { "titre": "Safe application", "texte": "Sprayed from the ground; only the hoses go up." }, { "titre": "Inspection", "texte": "Quality check and follow-up over time." } ], "reassurance": "Rigs stay at the foot of the building, nothing on the roof. No risk to the structure or the waterproofing when a trained, properly equipped crew does the work.", "video_url": "https://www.youtube.com/watch?v=9HOB5OVH0Ac" }, { "layout": "chiffres", "entete": { "badge": "Real results", "titre": "Measured in the field." }, "figures": [ { "value": "-7.5°C", "label": "on surface temperature" }, { "value": "+8 to 10 years", "label": "of waterproofing life kept" }, { "value": "80%", "label": "of CovaTherm jobs are on asphalt membranes" } ], "theme": "sombre" }, { "layout": "faq", "entete": { "badge": "FAQ", "titre": "Your questions, *our answers.*" }, "questions": [ { "question": "My waterproofing is old — do I need to redo it first?", "reponse": "Not necessarily. If the membrane is sound, the reflective coating protects it and adds years. If it is chalking or has microcracks but no leaks, CovaSeal 20 restores the waterproofing and cools the roof in one pass. A technical check settles it.
" }, { "question": "Does it hold on a mineral-surfaced membrane?", "reponse": "Yes, with the right prep and a bonding primer. It is one of the most common substrates for this system.
" }, { "question": "How many years does it add to my waterproofing?", "reponse": "By shielding it from UV and thermal shock, the reflective coating typically adds 8 to 10 years.
" }, { "question": "Do I have to strip off the old membrane?", "reponse": "No. A pressure-wash is enough, plus a repair of the detail points if needed.
" }, { "question": "What about existing leaks?", "reponse": "We deal with those before we coat. A reflective coating is protection, not a waterproofing repair.
" }, { "question": "Will I burn more heating in winter?", "reponse": "Barely. In winter the sun is low and scarce. The small shoulder-season loss is more than covered by the summer gain.
" } ], "json_ld": true }, { "layout": "cta", "variante": "final", "titre": "Take the heat out of your asphalt roof without redoing it.", "texte": "CovaTherm protects your membrane, drops the heat under the roof, and pushes back a heavy re-roof for as long as the waterproofing holds.", "reassurances": [ { "texte": "Talk to an expert" }, { "texte": "80% of our jobs on asphalt membranes" }, { "texte": "No commitment" } ], "cta_primaire": { "label": "Request a quote", "lien": "/en/diagnostic", "style": "primary" } }, { "layout": "contenu_seo", "intro": "The asphalt (bitumen) membrane is the most common waterproofing on the flat roofs of industrial and commercial buildings. Tough and proven, it has one flaw: its dark color makes it a heat trap.
", "sections": [ { "titre": "Why an asphalt membrane roof runs hot", "contenu": "Bitumen is dark, and a dark surface soaks up most of the sun that hits it. At the height of summer, an asphalt membrane can hit 80°C at the surface. That heat then drives through the roof and spreads inside.
" }, { "titre": "How a reflective roof coating works on asphalt membranes", "contenu": "A reflective roof coating is a light, high-reflectance finish laid straight over the existing waterproofing. The CovaTherm system does exactly that: primer, polyurethane base coat, and a finishing top coat.
" }, { "titre": "Reflective coating or new waterproofing: the smart call", "contenu": "A new membrane runs €80 to €100/m², and up to €150/m² if you redo the insulation. A reflective roof coating sits around €20 to €25/m² and pushes the replacement back.
" }, { "titre": "When to choose CovaSeal 20", "contenu": "When the waterproofing ages, chalks, or shows microcracks but no leaks, CovaSeal 20 reinforces it and cools the roof in one pass.
" }, { "titre": "A principle backed by research", "contenu": "Labs have studied reflective roofs for decades. Those numbers explain the gains we measure on large industrial roofs.
" }, { "titre": "Protection that lasts", "contenu": "The CovaTherm system — polyurethane with a finishing varnish — is built to hold its performance for 8 to 10 years. That longevity is what turns a reflective coating into an investment.
" } ], "sources": [ { "label": "Lawrence Berkeley National Laboratory, Heat Island Group, Reflective Roofs", "url": "https://heatisland.lbl.gov/coolscience/cool-roofs" }, { "label": "U.S. Environmental Protection Agency, Using Reflective Roofs to Reduce Heat Islands", "url": "https://www.epa.gov/heatislands/using-cool-roofs-reduce-heat-islands" }, { "label": "EPA, Reducing Urban Heat Islands: Compendium of Strategies, Reflective Roofs", "url": "https://www.epa.gov/sites/default/files/2014-06/documents/coolroofscompendium.pdf" }, { "label": "U.S. EPA, Heat Island Effect: reflective roofs", "url": "https://www.epa.gov/heatislands" } ], "replie": true } ] }