{"id":30904,"date":"2026-09-06T10:46:53","date_gmt":"2026-09-06T09:46:53","guid":{"rendered":"https:\/\/marcus.sk\/blog\/?p=30904"},"modified":"2026-09-06T11:47:57","modified_gmt":"2026-09-06T10:47:57","slug":"making-a-window-sill-for-a-circular-window","status":"publish","type":"post","link":"https:\/\/marcus.sk\/blog\/en\/making-a-window-sill-for-a-circular-window\/","title":{"rendered":"Making a Window Sill for a Circular Window"},"content":{"rendered":"<article>\n<h1>Making a Window Sill for a Circular Window<\/h1>\n<h2>1. Introduction<\/h2>\n<p class=\"lead\">Modern architecture demands that you are prepared for every detail. If an architect comes up with an interesting building shape \u2014 curved walls or various roof radii \u2014 a good sheet-metal worker has to be able to handle the challenge. We are not going to cover those demanding details here. Instead, we will look at a detail that seems simple at first glance: making a circular window sill on the fa\u00e7ade of a family house.<\/p>\n<p>It is in fact a demanding detail, because producing the circular opening itself is difficult work, whether for the joiner or the PVC window manufacturer. We are not going to discuss how the window opens, but how a sill can be made for this type of opening.<\/p>\n<p>This whole article grew out of a visit to a hotel in Star\u00e1 \u013dubov\u0148a, where I spotted a circular window. The sill flashing had been installed, but it was not aesthetically pleasing. That is why I want to show you how this type of detail can be done more attractively, faster and with a better finish. It will not be cheaper \u2014 but our goal here is a good-looking, functional detail.<\/p>\n<h2>2. What types of window sills do we know?<\/h2>\n<p>These are the basic types of sills used and installed on building sites in our region:<\/p>\n<ul>\n<li><strong>Extruded aluminium sills<\/strong> \u2014 the most widely used<\/li>\n<li><strong>Galvanised sheet sills<\/strong> finished with plastic or aluminium end caps<\/li>\n<li><strong>Sills made the sheet-metal craftsman&#8217;s way<\/strong> \u2014 folded, planished and soldered<\/li>\n<\/ul>\n<p>We prefer craft-made sills, and the most demanding method is a sill with a <strong>curved (rolled) front bead<\/strong>. The best material for this type of work is sheet metal that can be planished and soldered \u2014 in this case copper, titanium zinc or natural aluminium.<\/p>\n<h2>3. Measuring, drawing and developed width<\/h2>\n<p>Accurately measuring the opening and then calculating the developed width, together with the method of curving the sill, is the essential part of preparing the job. You can even use a simple template drawn on stiff card \u2014 that way you prepare a jig that helps you mark everything out so the sill can be reliably fabricated and correctly fitted into the fa\u00e7ade. Let&#8217;s get started.<\/p>\n<h3>Measuring<\/h3>\n<ul>\n<li>Measure the diameter of the window and calculate the length of the sill<\/li>\n<li>Draw the fold needed to seat the sill into the window<\/li>\n<li>Mark out the fold needed on the fa\u00e7ade, running downwards<\/li>\n<li>Prepare the end detail at the start and the finish of the circular sill<\/li>\n<\/ul>\n<div class=\"gallery\">\n<figure><a href=\"https:\/\/marcus.sk\/blog\/en\/making-a-window-sill-for-a-circular-window\/vyroba-parapetu-kruh-01-2\/\"><img decoding=\"async\" src=\"https:\/\/marcus.sk\/blog\/wp-content\/uploads\/2026\/09\/vyroba-parapetu-kruh-01.png\" alt=\"Drawing of a circular window sill \u2014 setting out step 1\" \/><\/a><\/figure>\n<figure><a href=\"https:\/\/marcus.sk\/blog\/en\/making-a-window-sill-for-a-circular-window\/vyroba-parapetu-kruh-02-2\/\"><img decoding=\"async\" src=\"https:\/\/marcus.sk\/blog\/wp-content\/uploads\/2026\/09\/vyroba-parapetu-kruh-02.png\" alt=\"Drawing of a circular window sill \u2014 setting out step 2\" \/><\/a><\/figure>\n<figure><a href=\"https:\/\/marcus.sk\/blog\/en\/making-a-window-sill-for-a-circular-window\/vyroba-parapetu-kruh-03-3-2\/\"><img decoding=\"async\" src=\"https:\/\/marcus.sk\/blog\/wp-content\/uploads\/2026\/09\/vyroba-parapetu-kruh-03-1.png\" alt=\"Drawing of a circular window sill \u2014 developed width of the profile\" \/><\/a><\/figure>\n<figure><a href=\"https:\/\/marcus.sk\/blog\/en\/making-a-window-sill-for-a-circular-window\/vyroba-parapetu-kruh-04-2\/\"><img decoding=\"async\" src=\"https:\/\/marcus.sk\/blog\/wp-content\/uploads\/2026\/09\/vyroba-parapetu-kruh-04.png\" alt=\"Drawing of a circular window sill \u2014 end detail at the reveal\" \/><\/a><\/figure>\n<\/div>\n<h3>Working procedure<\/h3>\n<ul>\n<li>The front bead is formed as the first fold on the sill<\/li>\n<li>For the fold running down the fa\u00e7ade we use the CMB tool<\/li>\n<li>For the fold at the window we use planishing or crimping shears<\/li>\n<li>We then curve it gradually, step by step<\/li>\n<\/ul>\n<h4>The bead<\/h4>\n<figure><img decoding=\"async\" src=\"https:\/\/marcus.sk\/blog\/wp-content\/uploads\/2026\/09\/IMG_20200205_134118-scaled-1.jpg\" alt=\"Forming the front bead on a sheet-metal window sill\" \/><\/figure>\n<h4>For the fold down the fa\u00e7ade we use the CMB tool<\/h4>\n<figure><img decoding=\"async\" src=\"https:\/\/marcus.sk\/blog\/wp-content\/uploads\/2026\/08\/zakruzovanie-navalkov-02.jpg\" alt=\"Curving the bead with the CMB bead-rolling tool\" \/><\/figure>\n<h4>The finished sill<\/h4>\n<figure><img decoding=\"async\" src=\"https:\/\/marcus.sk\/blog\/wp-content\/uploads\/2026\/09\/1656776909432.jpg\" alt=\"Finished circular sheet-metal window sill with a curved bead\" \/><\/figure>\n<h2>4. Tools \u2014 what you really need<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.marcus.sk\/sk\/pomocky-na-ohybanie\/1502-zakruzovanie-navalkov-cmb-et.html\">Bead curving set CMB-ET<\/a><\/li>\n<li><a href=\"https:\/\/www.marcus.sk\/sk\/pomocky-na-ohybanie\/1500-tepanie-plechu-4251849104831.html\">Sheet metal planishing tool<\/a><\/li>\n<li><a href=\"https:\/\/www.marcus.sk\/sk\/vybavenie-klampiarskej-dielne\/2317-zakruzovanie-navalkov.html\">Bead curving (workshop equipment)<\/a><\/li>\n<li><a href=\"https:\/\/www.marcus.sk\/sk\/rolovacie-ohybacky\/1005-rolovacia-ohybacka-na-zakruzovanie-bkk-50-5-50-mm.html\">Roll bender for curving BKK 50, 5\u201350 mm<\/a><\/li>\n<li><a href=\"https:\/\/www.marcus.sk\/sk\/ohybacky-plechu-do-dielne\/1103-stavebna-ohybacka-jouanel-pcx3080a.html\">Folder with integrated curving JOUANEL PCX3080A<\/a><\/li>\n<li><a href=\"https:\/\/www.marcus.sk\/sk\/pomocky-na-ohybanie\/1598-tyc-tvaru-t-na-zakruzovanie-36-cm-o-13-mm.html\">Curving aid \u2014 T-shaped bar, 36 cm, \u230013 mm<\/a><\/li>\n<li><a href=\"https:\/\/www.marcus.sk\/sk\/ohybacky-plechu-do-dielne\/1228-segmentova-ohybacka-jouanel-hs33-1270-mm.html\">Segmented folder JOUANEL HS33 \u2014 1270 mm<\/a><\/li>\n<\/ul>\n<div class=\"gallery\">\n<figure><a href=\"https:\/\/marcus.sk\/blog\/en\/making-a-window-sill-for-a-circular-window\/zakruzovanie-navalkov-cmb-et-2-2\/\"><img decoding=\"async\" src=\"https:\/\/marcus.sk\/blog\/wp-content\/uploads\/2026\/09\/zakruzovanie-navalkov-cmb-et-300x225.jpg\" alt=\"CMB-ET bead curving set\" \/><\/a><figcaption>CMB-ET bead curving set<\/figcaption><\/figure>\n<figure><a href=\"https:\/\/marcus.sk\/blog\/en\/tanierova-ohybacka-dachfreunde-01-2\/\"><img decoding=\"async\" src=\"https:\/\/marcus.sk\/blog\/wp-content\/uploads\/2025\/08\/tanierova-ohybacka-dachfreunde-01-300x300.jpg\" alt=\"Disc-type roll bender Dachfreunde\" \/><\/a><figcaption>Disc-type roll bender<\/figcaption><\/figure>\n<figure><a href=\"https:\/\/marcus.sk\/blog\/en\/aircraft-models-thanks-to-the-plumbing-craft\/img20240412095051-2\/\"><img decoding=\"async\" src=\"https:\/\/marcus.sk\/blog\/wp-content\/uploads\/2024\/04\/IMG20240412095051-scaled-e1713618761238-300x169.jpg\" alt=\"MASC NIBBLER punch shears BK1\" \/><\/a><figcaption>BK1 nibbler shears<\/figcaption><\/figure>\n<figure><a href=\"https:\/\/marcus.sk\/blog\/en\/how-best-to-use-plumbing-tools\/ohybacie-klieste-picollo-stubai-1-2\/\"><img decoding=\"async\" src=\"https:\/\/marcus.sk\/blog\/wp-content\/uploads\/2023\/06\/Ohybacie-klieste-PICOLLO-stubai-1-169x300.gif\" alt=\"Stubai Piccolo bending tongs\" \/><\/a><figcaption>Stubai Piccolo bending tongs<\/figcaption><\/figure>\n<figure><a href=\"https:\/\/marcus.sk\/blog\/en\/aircraft-models-thanks-to-the-plumbing-craft\/img20240412174136-2\/\"><img decoding=\"async\" src=\"https:\/\/marcus.sk\/blog\/wp-content\/uploads\/2024\/04\/IMG20240412174136-169x300.jpg\" alt=\"Planishing sheet metal by hand\" \/><\/a><figcaption>Planishing sheet metal<\/figcaption><\/figure>\n<figure><a href=\"https:\/\/marcus.sk\/blog\/en\/segment-bending-machines-overwiew\/segmentova-ohybacka-pcx1020t-102-m-2\/\"><img decoding=\"async\" src=\"https:\/\/marcus.sk\/blog\/wp-content\/uploads\/2025\/04\/segmentova-ohybacka-pcx1020t-102-m-e1745045315324-300x277.jpg\" alt=\"Segmented folder PCX1020T 1.02 m\" \/><\/a><figcaption>Segmented folder PCX1020T, 1.02 m<\/figcaption><\/figure>\n<figure><a href=\"https:\/\/marcus.sk\/blog\/en\/making-a-window-sill-for-a-circular-window\/tepanie-plechu-2\/\"><img decoding=\"async\" src=\"https:\/\/marcus.sk\/blog\/wp-content\/uploads\/2026\/09\/tepanie-plechu-300x225.png\" alt=\"Planishing tool used on a circular sill\" \/><\/a><figcaption>Planishing the sheet<\/figcaption><\/figure>\n<\/div>\n<h2>5. The most common mistakes<\/h2>\n<ul>\n<li>Missing separation and waterproofing layer above absorbent insulation<\/li>\n<li>Water running down the fa\u00e7ade \u2192 staining and colour patches<\/li>\n<li>Unresolved termination at the reveal (typical with extruded aluminium)<\/li>\n<li>Zero fall, short overhangs, missing expansion allowance<\/li>\n<\/ul>\n<p>Making a circular sill is a demanding task. You need experience in working sheet metal, and the result has to stay functional for many years. Unprofessional installation of a circular sill can cause damage to the fa\u00e7ade: water from the sill can get into the reveal and the thermal insulation, and it can also stain the fa\u00e7ade.<\/p>\n<p>Choosing the right material matters as well. When we talk about sills fitted into circular openings, the ideal material is one that will not be damaged by planishing and forming \u2014 this can be copper or titanium zinc. Plastic-coated (coil-coated) sheet may not be a suitable solution, because planishing damages the coating and the result will not look professional.<\/p>\n<p>One example of incorrect installation is shown in the picture below. Several mistakes are visible at first glance, and the most fundamental one is the way the inner edge at the window was curved: the sheet was simply snipped and then riveted into the window frame. I do not know the background of how the window was installed, but the lack of craftsmanship is obvious.<\/p>\n<div class=\"risks\">\n<p><strong>List of risks arising from incorrect installation:<\/strong><\/p>\n<ul>\n<li>water leaking into the structure<\/li>\n<li>damage to the thermal insulation<\/li>\n<li>colour staining and patches on the fa\u00e7ade<\/li>\n<li>reduced service life of the building<\/li>\n<\/ul>\n<\/div>\n<figure><img decoding=\"async\" src=\"https:\/\/marcus.sk\/blog\/wp-content\/uploads\/2026\/09\/kruhovy-parapet-01.jpg\" alt=\"Incorrectly installed circular window sill\" \/><\/figure>\n<p>So let&#8217;s look at how to make a circular sill correctly. We have already agreed that we will leave it to a sheet-metal craftsman. But to which one? Here we need to be clear about the technological equipment the craftsman will need in order to carry out the work properly.<\/p>\n<h3>Incorrectly executed sills<\/h3>\n<div class=\"gallery\">\n<figure><a href=\"https:\/\/marcus.sk\/blog\/en\/making-a-window-sill-for-a-circular-window\/img20260528193927-2\/\"><img decoding=\"async\" src=\"https:\/\/marcus.sk\/blog\/wp-content\/uploads\/2026\/08\/IMG20260528193927-1024x1024.jpg\" alt=\"Poorly executed circular window sill \u2014 detail of the inner edge\" \/><\/a><\/figure>\n<figure><a href=\"https:\/\/marcus.sk\/blog\/en\/making-a-window-sill-for-a-circular-window\/img20260528193922-2\/\"><img decoding=\"async\" src=\"https:\/\/marcus.sk\/blog\/wp-content\/uploads\/2026\/08\/IMG20260528193922-1024x1024.jpg\" alt=\"Poorly executed circular window sill \u2014 riveting into the window frame\" \/><\/a><\/figure>\n<\/div>\n<h2>6. FAQ<\/h2>\n<ul>\n<li>What is the difference between a square-edged sill and a sill with a curved bead?<\/li>\n<li>Can a sill be made without a segmented folder?<\/li>\n<li>Why is an extruded aluminium sill not worth it?<\/li>\n<li>What should go under the sill with mineral wool or a STEICO board?<\/li>\n<li>What fall should a sill have?<\/li>\n<\/ul>\n<hr \/>\n<p class=\"share\"><strong>Share this article:<\/strong><br \/>\n<a href=\"https:\/\/marcus.sk\/#facebook\">Facebook<\/a><br \/>\n<a href=\"https:\/\/marcus.sk\/#twitter\">Twitter<\/a><br \/>\n<a href=\"https:\/\/marcus.sk\/#email\">Email<\/a><br \/>\n<a href=\"https:\/\/marcus.sk\/#linkedin\">LinkedIn<\/a><br \/>\n<a href=\"https:\/\/marcus.sk\/#whatsapp\">WhatsApp<\/a><br \/>\n<a href=\"https:\/\/marcus.sk\/#facebook_messenger\">Messenger<\/a><\/p>\n<h2>Related articles<\/h2>\n<div class=\"gallery\">\n<figure><a href=\"https:\/\/marcus.sk\/blog\/en\/the-best-chimney-templates-on-our-market\/\"><img decoding=\"async\" src=\"https:\/\/marcus.sk\/blog\/wp-content\/uploads\/2025\/01\/kominove-sablony-na-trhu-348x215.jpg\" alt=\"The best chimney templates on our market\" \/><\/a><figcaption><a href=\"https:\/\/marcus.sk\/blog\/en\/the-best-chimney-templates-on-our-market\/\">The best chimney templates on our market<\/a><br \/>\n<span class=\"meta\">3 September 2026<\/span><\/figcaption><\/figure>\n<figure><a href=\"https:\/\/marcus.sk\/blog\/en\/overview-of-roll-forming-machines-for-standing-seam-roofing\/\"><img decoding=\"async\" src=\"https:\/\/marcus.sk\/blog\/wp-content\/uploads\/2026\/06\/profilovaci-stroj-marcus-trade-1-348x215.jpg\" alt=\"Roll forming machines for standing seam roofing\" \/><\/a><figcaption><a href=\"https:\/\/marcus.sk\/blog\/en\/overview-of-roll-forming-machines-for-standing-seam-roofing\/\">Roll forming machines for standing seam roofing \u2014 an overview<\/a><br \/>\n<span class=\"meta\">5 June 2026<\/span><\/figcaption><\/figure>\n<figure><a href=\"https:\/\/marcus.sk\/blog\/en\/ventilated-facade-with-standing-seam-cladding-most-common-mistakes-and-how-to-avoid-them\/\"><img decoding=\"async\" src=\"https:\/\/marcus.sk\/blog\/wp-content\/uploads\/2026\/04\/IMG20260401080510-348x215.jpg\" alt=\"Ventilated fa\u00e7ade made of standing seam cladding\" \/><\/a><figcaption><a href=\"https:\/\/marcus.sk\/blog\/en\/ventilated-facade-with-standing-seam-cladding-most-common-mistakes-and-how-to-avoid-them\/\">Ventilated fa\u00e7ade from standing seam cladding: the most common mistakes and how to avoid them<\/a><br \/>\n<span class=\"meta\">2 June 2026<\/span><\/figcaption><\/figure>\n<\/div>\n<hr \/>\n<p class=\"meta\">Author: <a href=\"https:\/\/marcus.sk\/blog\/author\/volf\/\">Marek Pjen\u010dak<\/a> \u2014 <a href=\"https:\/\/marcus.sk\/blog\/author\/volf\/\">View all articles by Marek Pjen\u010dak \u2192<\/a><\/p>\n<p class=\"meta\">Original (SK): <a href=\"https:\/\/marcus.sk\/blog\/en\/making-a-window-sill-for-a-circular-window\/\">V\u00fdroba parapetu na kruhovom okne<\/a><\/p>\n<\/article>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Making a Window Sill for a Circular Window 1. Introduction Modern architecture demands that you are prepared for every detail. If an architect comes up with an interesting building shape &hellip; <\/p>\n","protected":false},"author":1,"featured_media":30875,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[214],"tags":[],"class_list":["post-30904","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-plumbing-tools"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Making a Window Sill for a Circular Window - Marcus blog<\/title>\n<meta name=\"description\" content=\"Making a Window Sill for a Circular Window\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/marcus.sk\/blog\/en\/making-a-window-sill-for-a-circular-window\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Making a Window Sill for a Circular Window - 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