{"id":1961,"date":"2018-02-12T15:29:07","date_gmt":"2018-02-12T20:29:07","guid":{"rendered":"https:\/\/labeauairsol.ca\/residential\/weeping-merula-building-cancer\/"},"modified":"2026-10-22T15:33:52","modified_gmt":"2026-10-22T19:33:52","slug":"weeping-merula-building-cancer","status":"publish","type":"page","link":"https:\/\/labeauairsol.ca\/en\/residential\/weeping-merula-building-cancer\/","title":{"rendered":"Weeping dry rot (building cancer)"},"content":{"rendered":"\n<section class=\"lab-detail-hero\" style=\"--detail-photo:url('https:\/\/labeauairsol.ca\/wp-content\/uploads\/2018\/10\/M\u00e9rule-pleureuse_champignon-1920x400.jpg')\"><div class=\"lab-detail-container\"><nav class=\"lab-detail-breadcrumb\" aria-label=\"Breadcrumb\"><a href=\"https:\/\/labeauairsol.ca\/en\/\">Home<\/a><span aria-hidden=\"true\">\/<\/span><a href=\"https:\/\/labeauairsol.ca\/en\/residential\/\">Laboratory analyses<\/a><span aria-hidden=\"true\">\/<\/span><span aria-current=\"page\">Dry rot (building cancer)<\/span><\/nav><p class=\"lab-detail-kicker\">Laboratory analyses<\/p><h1>Dry rot (building cancer)<\/h1><h2 class=\"lab-detail-subtitle\">A fungus that can damage wooden structures<\/h2><p class=\"lab-detail-hero-description\">Identification of dry rot and other wood-decay fungi that can affect wooden structures.<\/p><a class=\"lab-detail-quick\" href=\"#lab-detail-resources\">View resources<\/a><\/div><\/section>\n<div class=\"lab-detail-container lab-detail-layout\"><article class=\"lab-detail-content\">\n<section class=\"lab-merule-section lab-analysis-section\">\n<p class=\"lab-merule-eyebrow lab-analysis-eyebrow lab-detail-section-label\">01 \/ Introduction<\/p>\n<p>Have you discovered an unusual fungus in your crawl space, basement or on a wooden structure? It could be dry rot.<\/p>\n<p>Sometimes called \u201cbuilding cancer\u201d, dry rot can cause significant deterioration of wood materials. Lab\u2019Eau-Air-Sol identifies fungi in samples collected from buildings to help determine the nature of suspicious growth.<\/p>\n<\/section>\n<section class=\"lab-merule-section lab-analysis-section\">\n<p class=\"lab-merule-eyebrow lab-analysis-eyebrow lab-detail-section-label\">02 \/ About the analysis<\/p>\n<h2>Understanding and identifying dry rot<\/h2>\n<div class=\"lab-merule-topic lab-analysis-topic\">\n<div class=\"lab-merule-heading-feature lab-analysis-heading-feature\"><h3>What is dry rot?<\/h3><\/div>\n<p>Dry rot, known scientifically as <em>Serpula lacrymans<\/em>, is a wood-decay fungus that breaks down certain components of wood. Its growth can weaken framing and other wooden components of a building.<\/p>\n<div class=\"lab-merule-subtopic lab-analysis-subtopic\">\n<h4>How can you recognize dry rot?<\/h4>\n<p>Its appearance varies with its stage of development. It may form a cotton-like network of whitish filaments, greyish mycelial strands or brownish to orange fruiting bodies.<\/p>\n<p>Several fungi can look similar. A visual inspection alone is therefore not always enough to confirm dry rot.<\/p>\n<\/div>\n<figure class=\"lab-merule-figure lab-analysis-figure\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/labeauairsol.ca\/wp-content\/uploads\/2018\/12\/Me%CC%81rule-pleureuse-1200x561-1024x479.jpg\" alt=\"Fungal growth illustrating dry rot\" width=\"1024\" height=\"479\" loading=\"lazy\"><figcaption>Dry rot \u2014 an example of fungal growth.<\/figcaption><\/figure>\n<div class=\"lab-merule-subtopic lab-analysis-subtopic\">\n<h4>Growth conditions and effects on buildings<\/h4>\n<p>Dry rot develops in favourable moisture conditions, particularly in crawl spaces, basements and areas affected by water infiltration.<\/p>\n<p>It can form filaments and strands capable of passing through certain non-wood materials, such as masonry joints, to reach other sources of wood.<\/p>\n<p>As it degrades wood, it can weaken structural components. The extent of the damage depends on factors including moisture conditions, how long the problem has been present and the materials affected.<\/p>\n<\/div><\/div>\n<div class=\"lab-merule-topic lab-analysis-topic\">\n<div class=\"lab-merule-heading-feature lab-analysis-heading-feature\"><h3>What does the analysis involve?<\/h3><\/div>\n<p>Lab\u2019Eau-Air-Sol examines samples of fungal growth or suspect materials in the laboratory to identify the fungus present. This analysis helps distinguish dry rot from other fungi with a similar appearance.<\/p>\n<p>The results provide information about the submitted sample. On their own, they do not establish the extent of contamination or structural damage. These aspects may require a further investigation of the building.<\/p>\n<\/div>\n<div class=\"lab-merule-topic lab-analysis-topic\">\n<div class=\"lab-merule-heading-feature lab-analysis-heading-feature\"><h3>When should you request this analysis?<\/h3><\/div>\n<p>An analysis may be useful when suspicious fungal growth is observed in a building, particularly where moisture problems are present.<\/p>\n<ul>\n<li>You discover whitish, greyish or brownish growth on a wooden structure.<\/li>\n<li>You suspect dry rot in a crawl space or basement.<\/li>\n<li>You notice unusual wood deterioration accompanied by signs of fungal growth.<\/li>\n<li>You want to identify a fungus before planning corrective work.<\/li>\n<li>You need identification results to support a building investigation or report.<\/li>\n<li>You would like information about analysis procedures and costs.<\/li>\n<\/ul>\n<div class=\"lab-merule-subtopic lab-analysis-subtopic\">\n<h4>What should you do if you suspect dry rot?<\/h4>\n<p>Avoid scraping, moving or removing suspect materials without obtaining appropriate advice.<\/p>\n<p>It is important to identify sources of moisture and have potential damage assessed when structural components appear to be affected. Corrective measures must suit the situation and the extent of the damage.<\/p>\n<\/div>\n<div class=\"lab-merule-video lab-analysis-video\">\n<h4>Learn more<\/h4>\n<p>Watch a Radio-Canada report from the programme <em>La Facture<\/em> about a house affected by dry rot. The report is in French.<\/p>\n<a class=\"lab-merule-video-link lab-analysis-video-link\" href=\"https:\/\/www.youtube.com\/watch?v=gt3vPa2QL0Q\" target=\"_blank\" rel=\"noopener noreferrer\">Watch the La Facture report <span aria-hidden=\"true\">\u2197<\/span><\/a>\n<\/div><\/div><\/section>\n<section class=\"lab-merule-section lab-analysis-section\">\n<p class=\"lab-merule-eyebrow lab-analysis-eyebrow lab-detail-section-label\">03 \/ Sampling<\/p>\n<h2>How do you collect a sample?<\/h2>\n<p>Consult our instructions for details on collecting and submitting a suspect sample.<\/p>\n<p>If you suspect significant contamination or structural damage, seek professional advice before disturbing the materials.<\/p>\n<div class=\"lab-merule-sample lab-analysis-sample\"><div class=\"lab-merule-sample-text lab-analysis-sample-text\"><h3>Sampling methods<\/h3><p>Find instructions for preparing and submitting your samples.<\/p><\/div><a class=\"lab-merule-button lab-merule-button-outline lab-analysis-button lab-analysis-button-outline\" href=\"https:\/\/labeauairsol.ca\/en\/withdrawal\/\">View sampling instructions <span aria-hidden=\"true\">\u2197<\/span><\/a><\/div>\n<\/section><\/article>\n<aside class=\"lab-detail-aside\" id=\"lab-detail-resources\" tabindex=\"-1\" aria-label=\"Resources\"><div class=\"lab-merule-resources lab-analysis-resources\">\n<div class=\"lab-merule-resources-head lab-analysis-resources-head\"><h2>Resources<\/h2><p>Useful documents for your analysis<\/p><\/div>\n<div class=\"lab-merule-form lab-analysis-form\"><h3>Analysis request<\/h3><p>Download the general analysis request form and include it with your samples. This document is available in French.<\/p><div class=\"lab-merule-file lab-analysis-file\"><span class=\"lab-merule-pdf lab-analysis-pdf\">PDF<\/span> <span>General analysis request (D-GL) \u2014 French<\/span><\/div><a class=\"lab-merule-button lab-analysis-button\" href=\"https:\/\/labeauairsol.ca\/wp-content\/uploads\/2026\/05\/Demande-danalyse-generale-D-GL.pdf\" target=\"_blank\" rel=\"noopener noreferrer\" hreflang=\"fr\">Open the form (French PDF) <span aria-hidden=\"true\">\u2197<\/span><\/a><\/div>\n<\/div><\/aside><\/div>\n<div class=\"lab-detail-container lab-detail-contact-wrap\"><div class=\"lab-detail-contact\"><div><h2>A question about our analyses?<\/h2><p>Our team can provide information about the analyses we offer, sampling and submitting your samples.<\/p><\/div><a class=\"lab-merule-button lab-analysis-button\" href=\"https:\/\/labeauairsol.ca\/en\/contact-us\/\">Contact us <span aria-hidden=\"true\">\u2197<\/span><\/a><\/div><\/div>\n\n","protected":false},"excerpt":{"rendered":"<p>Home\/Laboratory analyses\/Dry rot (building cancer) Laboratory analyses Dry rot (building cancer) A fungus that can damage wooden structures Identification of dry rot and other wood-decay fungi that can affect wooden structures. View resources 01 \/ Introduction Have you discovered an unusual fungus in your crawl space, basement or on a wooden structure? It could be dry rot. Sometimes called \u201cbuilding cancer\u201d, dry rot can cause significant deterioration of wood materials. Lab\u2019Eau-Air-Sol identifies fungi in samples collected from buildings to help determine the nature of suspicious growth. 02 \/ About the analysis Understanding and identifying dry rot What is dry rot? Dry rot, known scientifically as Serpula lacrymans, is a wood-decay fungus that breaks down certain components of wood. Its growth can weaken framing and other wooden components of a building. How can you recognize dry rot? Its appearance varies with its stage of development. It may form a cotton-like network of whitish filaments, greyish mycelial strands or brownish to orange fruiting bodies. Several fungi can look similar. A visual inspection alone is therefore not always enough to confirm dry rot. Dry rot \u2014 an example of fungal growth. Growth conditions and effects on buildings Dry rot develops in favourable moisture conditions, particularly in crawl spaces, basements and areas affected by water infiltration. It can form filaments and strands capable of passing through certain non-wood materials, such as masonry joints, to reach other sources of wood. As it degrades wood, it can weaken structural components. The extent of the damage depends on factors including moisture conditions, how long the problem has been present and the materials affected. What does the analysis involve? Lab\u2019Eau-Air-Sol examines samples of fungal growth or suspect materials in the laboratory to identify the fungus present. This analysis helps distinguish dry rot from other fungi with a similar appearance. The results provide information about the submitted sample. On their own, they do not establish the extent of contamination or structural damage. These aspects may require a further investigation of the building. When should you request this analysis? An analysis may be useful when suspicious fungal growth is observed in a building, particularly where moisture problems are present. You discover whitish, greyish or brownish growth on a wooden structure. You suspect dry rot in a crawl space or basement. You notice unusual wood deterioration accompanied by signs of fungal growth. You want to identify a fungus before planning corrective work. You need identification results to support a building investigation or report. You would like information about analysis procedures and costs. What should you do if you suspect dry rot? Avoid scraping, moving or removing suspect materials without obtaining appropriate advice. It is important to identify sources of moisture and have potential damage assessed when structural components appear to be affected. Corrective measures must suit the situation and the extent of the damage. Learn more Watch a Radio-Canada report from the programme La Facture about a house affected by dry rot. The report is in French. Watch the La Facture report \u2197 03 \/ Sampling How do you collect a sample? Consult our instructions for details on collecting and submitting a suspect sample. If you suspect significant contamination or structural damage, seek professional advice before disturbing the materials. Sampling methods Find instructions for preparing and submitting your samples. View sampling instructions \u2197 Resources Useful documents for your analysis Analysis request Download the general analysis request form and include it with your samples. This document is available in French. PDF General analysis request (D-GL) \u2014 French Open the form (French PDF) \u2197 A question about our analyses? Our team can provide information about the analyses we offer, sampling and submitting your samples. Contact us \u2197<\/p>\n","protected":false},"author":4,"featured_media":1884,"parent":1941,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"lab-native-analyse.php","meta":{"_acf_changed":false,"_eb_attr":"","_uag_custom_page_level_css":"","footnotes":""},"class_list":["post-1961","page","type-page","status-publish","has-post-thumbnail","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Residential intervention program for weeping mould analysis<\/title>\n<meta name=\"description\" content=\"The Residential Weeping Mould Intervention Program determines your eligibility for financial assistance.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/labeauairsol.ca\/en\/residential\/weeping-merula-building-cancer\/\" \/>\n<meta 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analyses\/Dry rot (building cancer) Laboratory analyses Dry rot (building cancer) A fungus that can damage wooden structures Identification of dry rot and other wood-decay fungi that can affect wooden structures. 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