{"id":3429,"date":"2024-09-02T10:00:26","date_gmt":"2024-09-02T10:00:26","guid":{"rendered":"https:\/\/ikoknowledgecenter.com\/docs\/uncategorized\/how-is-a-bituminous-underlayer-mechanically-fastened\/"},"modified":"2025-06-26T13:53:21","modified_gmt":"2025-06-26T13:53:21","password":"","slug":"how-is-a-bituminous-underlayer-mechanically-fastened","status":"publish","type":"docs","link":"https:\/\/ikoknowledgecenter.com\/en\/docs\/flat-roof-systems\/how-is-a-bituminous-underlayer-mechanically-fastened\/","title":{"rendered":"How is a bituminous underlayer mechanically fastened?"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">A bituminous underlayer is best installed as follows:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>The first membrane roll is unrolled and aligned.<\/li>\n\n\n\n<li>The membrane is mechanically fastened in the longitudinal overlap. The number of fasteners per running meter is determined based on the wind load on the roof.<br\/>The fasteners are installed in a straight vertical line into the substrate and positioned on the marking within the overlap. The screws are placed 4 cm from the edge.<\/li>\n\n\n\n<li>The 12 cm overlap at the longitudinal seams and the 10 cm overlap at the end seams are welded together using a soft flame.<\/li>\n<\/ul>\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-7387b849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:33.33%\">\n<ol class=\"wp-block-list\">\n<li style=\"font-size:16px\">Overlap width: 12 cm<\/li>\n\n\n\n<li style=\"font-size:16px\">Screw distance from edge: 4 cm<\/li>\n\n\n\n<li style=\"font-size:16px\">Pressure plate distance<br\/>from edge: \u2264 <strong data-start=\"827\" data-end=\"835\">2 cm<\/strong><\/li>\n\n\n\n<li style=\"font-size:16px\">Pressure plate width:<br\/><strong data-start=\"862\" data-end=\"870\">4 cm<\/strong><\/li>\n\n\n\n<li style=\"font-size:16px\">Roll marking indicates the screw locations<\/li>\n\n\n\n<li style=\"font-size:16px\">Underlayer finishing<\/li>\n<\/ol>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:66.66%\">\n<figure class=\"wp-block-image size-full is-resized\"><img fetchpriority=\"high\" decoding=\"async\" width=\"583\" height=\"243\" src=\"https:\/\/ikoknowledgecenter.com\/wp-content\/uploads\/2024\/09\/mechanisch-bevestigde-onderlaag.png\" alt=\"\" class=\"wp-image-716\" style=\"width:540px;height:auto\" srcset=\"https:\/\/ikoknowledgecenter.com\/wp-content\/uploads\/2024\/09\/mechanisch-bevestigde-onderlaag.png 583w, https:\/\/ikoknowledgecenter.com\/wp-content\/uploads\/2024\/09\/mechanisch-bevestigde-onderlaag-300x125.png 300w, https:\/\/ikoknowledgecenter.com\/wp-content\/uploads\/2024\/09\/mechanisch-bevestigde-onderlaag-360x150.png 360w\" sizes=\"(max-width: 583px) 100vw, 583px\" \/><\/figure>\n<\/div>\n<\/div>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<p class=\"wp-block-paragraph\">For more information, see our guide: <strong data-start=\"990\" data-end=\"1055\">\u201c<\/strong><a href=\"https:\/\/eu.iko.com\/en\/documentation\/flat-roof-systems\/all-you-need-to-know-about-the-bituminous-underlay\/\" target=\"_blank\" rel=\"noopener\">All you need to know about the bituminous underlay<\/a><strong data-start=\"990\" data-end=\"1055\">\u201d<\/strong>, available on the <strong data-start=\"1074\" data-end=\"1089\">IKO website<\/strong>.<\/p>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A bituminous underlayer is best installed as follows: For more information, see our guide: \u201cAll you need to know about the bituminous underlay\u201d, available on the IKO website.<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","template":"","meta":{"footnotes":"","_members_access_role":[],"_members_access_error":""},"doc_category":[63],"doc_tag":[64,849,65,338,307,868,867,848],"glossaries":[],"class_list":["post-3429","docs","type-docs","status-publish","hentry","doc_category-flat-roof-systems","doc_tag-bitumen-en","doc_tag-fastening-method","doc_tag-flat-roof","doc_tag-mechanical-fastening","doc_tag-roofing-en","doc_tag-screws","doc_tag-substrate","doc_tag-waterproofing"],"year_month":"2026-10","word_count":137,"total_views":"245","reactions":{"happy":"0","normal":"0","sad":"0"},"author_info":{"name":"Luna Degraeve","author_nicename":"luna","author_url":"https:\/\/ikoknowledgecenter.com\/en\/author\/luna\/"},"doc_category_info":[{"term_name":"Flat roof systems","term_url":"https:\/\/ikoknowledgecenter.com\/en\/docs-category\/flat-roof-systems\/"}],"doc_tag_info":[{"term_name":"bitumen","term_url":"https:\/\/ikoknowledgecenter.com\/en\/docs-tag\/bitumen-en\/"},{"term_name":"fastening method","term_url":"https:\/\/ikoknowledgecenter.com\/en\/docs-tag\/fastening-method\/"},{"term_name":"Flat roof","term_url":"https:\/\/ikoknowledgecenter.com\/en\/docs-tag\/flat-roof\/"},{"term_name":"mechanical fastening","term_url":"https:\/\/ikoknowledgecenter.com\/en\/docs-tag\/mechanical-fastening\/"},{"term_name":"roofing","term_url":"https:\/\/ikoknowledgecenter.com\/en\/docs-tag\/roofing-en\/"},{"term_name":"screws","term_url":"https:\/\/ikoknowledgecenter.com\/en\/docs-tag\/screws\/"},{"term_name":"substrate","term_url":"https:\/\/ikoknowledgecenter.com\/en\/docs-tag\/substrate\/"},{"term_name":"waterproofing","term_url":"https:\/\/ikoknowledgecenter.com\/en\/docs-tag\/waterproofing\/"}],"knowledge_base_info":[],"knowledge_base_slug":[],"_links":{"self":[{"href":"https:\/\/ikoknowledgecenter.com\/en\/wp-json\/wp\/v2\/docs\/3429","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ikoknowledgecenter.com\/en\/wp-json\/wp\/v2\/docs"}],"about":[{"href":"https:\/\/ikoknowledgecenter.com\/en\/wp-json\/wp\/v2\/types\/docs"}],"author":[{"embeddable":true,"href":"https:\/\/ikoknowledgecenter.com\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/ikoknowledgecenter.com\/en\/wp-json\/wp\/v2\/comments?post=3429"}],"version-history":[{"count":1,"href":"https:\/\/ikoknowledgecenter.com\/en\/wp-json\/wp\/v2\/docs\/3429\/revisions"}],"predecessor-version":[{"id":3430,"href":"https:\/\/ikoknowledgecenter.com\/en\/wp-json\/wp\/v2\/docs\/3429\/revisions\/3430"}],"wp:attachment":[{"href":"https:\/\/ikoknowledgecenter.com\/en\/wp-json\/wp\/v2\/media?parent=3429"}],"wp:term":[{"taxonomy":"doc_category","embeddable":true,"href":"https:\/\/ikoknowledgecenter.com\/en\/wp-json\/wp\/v2\/doc_category?post=3429"},{"taxonomy":"doc_tag","embeddable":true,"href":"https:\/\/ikoknowledgecenter.com\/en\/wp-json\/wp\/v2\/doc_tag?post=3429"},{"taxonomy":"glossaries","embeddable":true,"href":"https:\/\/ikoknowledgecenter.com\/en\/wp-json\/wp\/v2\/glossaries?post=3429"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}