{"id":3352,"date":"2018-08-30T03:10:30","date_gmt":"2018-08-29T17:10:30","guid":{"rendered":"https:\/\/www.houspect.com.au\/wa\/?p=3352"},"modified":"2020-01-07T11:14:43","modified_gmt":"2020-01-07T00:14:43","slug":"construction-wa-final-surface-finishes-impact-of-light","status":"publish","type":"post","link":"https:\/\/www.houspect.com.au\/wa\/construction-wa-final-surface-finishes-impact-of-light\/","title":{"rendered":"Construction in WA &#8211; Final Surface Finishes and Impact of Light"},"content":{"rendered":"<div class=\"wpb-content-wrapper\"><p>[vc_row][vc_column][vc_column_text]Often the impact of light (natural or artificial) on a final surface finish of a building element can have a dramatic effect. On occasions property owners will form the view that the quality of the final finish is unacceptable and a construction defect exists. Sometimes further investigation is warranted.<\/p>\n<h2>1\u00a0\u00a0\u00a0\u00a0\u00a0 Glancing Light \u2013 Impacts<\/h2>\n<p>Let\u2019s view the above picture taken in different light conditions. Notice the finish to the walls appear different between the two pictures?<\/p>\n<div id=\"attachment_3353\" style=\"width: 310px\" class=\"wp-caption alignnone\"><a class=\"dt-pswp-item\" href=\"https:\/\/www.houspect.com.au\/wa\/wp-content\/uploads\/sites\/2\/2018\/08\/1-1.png\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-3353\" class=\"size-medium wp-image-3353\" src=\"https:\/\/www.houspect.com.au\/wa\/wp-content\/uploads\/sites\/2\/2018\/08\/1-1-300x224.png\" alt=\"\" width=\"300\" height=\"224\" srcset=\"https:\/\/www.houspect.com.au\/wa\/wp-content\/uploads\/sites\/2\/2018\/08\/1-1-300x224.png 300w, https:\/\/www.houspect.com.au\/wa\/wp-content\/uploads\/sites\/2\/2018\/08\/1-1-768x574.png 768w, https:\/\/www.houspect.com.au\/wa\/wp-content\/uploads\/sites\/2\/2018\/08\/1-1.png 796w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><p id=\"caption-attachment-3353\" class=\"wp-caption-text\">(Source: Bob Cameron Illumination &amp; Decoration of Flat Surfaces Sixth Edition Landlinks Press 2009)<\/p><\/div>\n<p>&nbsp;<\/p>\n<p>As can be seen the different light conditions appear to present the condition of the wall in two very diffident states.<\/p>\n<p>The following examples show a more dramatic position:<\/p>\n<p><a class=\"dt-pswp-item\" href=\"https:\/\/www.houspect.com.au\/wa\/wp-content\/uploads\/sites\/2\/2018\/08\/2-1.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-3354\" src=\"https:\/\/www.houspect.com.au\/wa\/wp-content\/uploads\/sites\/2\/2018\/08\/2-1-210x300.png\" alt=\"\" width=\"210\" height=\"300\" srcset=\"https:\/\/www.houspect.com.au\/wa\/wp-content\/uploads\/sites\/2\/2018\/08\/2-1-210x300.png 210w, https:\/\/www.houspect.com.au\/wa\/wp-content\/uploads\/sites\/2\/2018\/08\/2-1.png 712w\" sizes=\"auto, (max-width: 210px) 100vw, 210px\" \/><\/a><a class=\"dt-pswp-item\" href=\"https:\/\/www.houspect.com.au\/wa\/wp-content\/uploads\/sites\/2\/2018\/08\/3-1.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-3355\" src=\"https:\/\/www.houspect.com.au\/wa\/wp-content\/uploads\/sites\/2\/2018\/08\/3-1-201x300.png\" alt=\"\" width=\"201\" height=\"300\" srcset=\"https:\/\/www.houspect.com.au\/wa\/wp-content\/uploads\/sites\/2\/2018\/08\/3-1-201x300.png 201w, https:\/\/www.houspect.com.au\/wa\/wp-content\/uploads\/sites\/2\/2018\/08\/3-1.png 680w\" sizes=\"auto, (max-width: 201px) 100vw, 201px\" \/><\/a><\/p>\n<p>It is generally accepted that the effect of the above is caused by glancing light off the surface<\/p>\n<p>finish.<\/p>\n<h2>2\u00a0 \u00a0 \u00a0 Glancing Light \u2013 How Does it Work?<\/h2>\n<p>Glancing light is the light which shines obliquely across the surface of a wall or ceiling. When the light shines at a particular angle it will illuminate one side of the undulation and create a shadow on the other side. Even the smallest imperfections will be visible under some lighting circumstances.<\/p>\n<p>Bob Brown in his Book (Landlinks Press 2009) provides the following diagram to show the impact of glancing light.<\/p>\n<p><a class=\"dt-pswp-item\" href=\"https:\/\/www.houspect.com.au\/wa\/wp-content\/uploads\/sites\/2\/2018\/08\/4-1.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-3356\" src=\"https:\/\/www.houspect.com.au\/wa\/wp-content\/uploads\/sites\/2\/2018\/08\/4-1-300x184.png\" alt=\"\" width=\"300\" height=\"184\" srcset=\"https:\/\/www.houspect.com.au\/wa\/wp-content\/uploads\/sites\/2\/2018\/08\/4-1-300x184.png 300w, https:\/\/www.houspect.com.au\/wa\/wp-content\/uploads\/sites\/2\/2018\/08\/4-1.png 517w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>So the bottom line is that glancing light can impact how a finished surface can look. The finished surface may look defective when viewed in a particular light but, in a different light the same surface can look significantly different.<\/p>\n<p>Let\u2019s look at another example from Bob Brown\u2019s book:<\/p>\n<p><a class=\"dt-pswp-item\" href=\"https:\/\/www.houspect.com.au\/wa\/wp-content\/uploads\/sites\/2\/2018\/08\/5-1.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-3357\" src=\"https:\/\/www.houspect.com.au\/wa\/wp-content\/uploads\/sites\/2\/2018\/08\/5-1-300x280.png\" alt=\"\" width=\"300\" height=\"280\" srcset=\"https:\/\/www.houspect.com.au\/wa\/wp-content\/uploads\/sites\/2\/2018\/08\/5-1-300x280.png 300w, https:\/\/www.houspect.com.au\/wa\/wp-content\/uploads\/sites\/2\/2018\/08\/5-1.png 523w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><a class=\"dt-pswp-item\" href=\"https:\/\/www.houspect.com.au\/wa\/wp-content\/uploads\/sites\/2\/2018\/08\/6.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-3358\" src=\"https:\/\/www.houspect.com.au\/wa\/wp-content\/uploads\/sites\/2\/2018\/08\/6-300x268.png\" alt=\"\" width=\"300\" height=\"268\" srcset=\"https:\/\/www.houspect.com.au\/wa\/wp-content\/uploads\/sites\/2\/2018\/08\/6-300x268.png 300w, https:\/\/www.houspect.com.au\/wa\/wp-content\/uploads\/sites\/2\/2018\/08\/6.png 514w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>Same ceiling, dramatically different lighting conditions show the area in vastly different conditions.<\/p>\n<p>And yet another example from Bob Brown\u2019s book:<\/p>\n<p><a class=\"dt-pswp-item\" href=\"https:\/\/www.houspect.com.au\/wa\/wp-content\/uploads\/sites\/2\/2018\/08\/7.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-3359\" src=\"https:\/\/www.houspect.com.au\/wa\/wp-content\/uploads\/sites\/2\/2018\/08\/7-289x300.png\" alt=\"\" width=\"289\" height=\"300\" srcset=\"https:\/\/www.houspect.com.au\/wa\/wp-content\/uploads\/sites\/2\/2018\/08\/7-289x300.png 289w, https:\/\/www.houspect.com.au\/wa\/wp-content\/uploads\/sites\/2\/2018\/08\/7.png 506w\" sizes=\"auto, (max-width: 289px) 100vw, 289px\" \/><\/a><a class=\"dt-pswp-item\" href=\"https:\/\/www.houspect.com.au\/wa\/wp-content\/uploads\/sites\/2\/2018\/08\/8.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-3360\" src=\"https:\/\/www.houspect.com.au\/wa\/wp-content\/uploads\/sites\/2\/2018\/08\/8-277x300.png\" alt=\"\" width=\"277\" height=\"300\" srcset=\"https:\/\/www.houspect.com.au\/wa\/wp-content\/uploads\/sites\/2\/2018\/08\/8-277x300.png 277w, https:\/\/www.houspect.com.au\/wa\/wp-content\/uploads\/sites\/2\/2018\/08\/8.png 509w\" sizes=\"auto, (max-width: 277px) 100vw, 277px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>So as can be seen by the above glancing light can impact the visual appearance of a final surface. As a result when critically assessing the quality of a final finish of a surface it is important that the effects of glancing light are negated. Dulux (\u201cPaints\u201d) in their technical Advice Guide \u201cPreparation \u2013 Glancing Light Version 2.02 of 3 notes:<\/p>\n<p><a class=\"dt-pswp-item\" href=\"https:\/\/www.houspect.com.au\/wa\/wp-content\/uploads\/sites\/2\/2018\/08\/9.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-3361\" src=\"https:\/\/www.houspect.com.au\/wa\/wp-content\/uploads\/sites\/2\/2018\/08\/9-300x265.png\" alt=\"\" width=\"300\" height=\"265\" srcset=\"https:\/\/www.houspect.com.au\/wa\/wp-content\/uploads\/sites\/2\/2018\/08\/9-300x265.png 300w, https:\/\/www.houspect.com.au\/wa\/wp-content\/uploads\/sites\/2\/2018\/08\/9.png 510w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<h2>3\u00a0 \u00a0 \u00a0 Additional Impacts<\/h2>\n<p>The quality of the final finish of a surface will also be significantly impacted by the level of finish specified for the surface. While all painted surfaces will require an undercoat and two coats of paint, there can be different levels of finish for the underlying surface. For example, in relation to gyprock walls and ceilings the AS\/NZS 2589:2007 Gypsum linings in residential and Light Commercial Construction- Application and Finishing. Part 1: Gypsum Plasterboard specifies 6 different levels of finish. A level 4 finish is the accepted level of finish in domestic construction.<\/p>\n<p>The bottom line when assessing the quality of the final finish of a surface it may also be necessary to consider the specified standard of the finished surface below the painted surface.<\/p>\n<h2>4\u00a0 \u00a0 \u00a0 In Summary<\/h2>\n<p>It is important to know about and understand the impacts of glancing light on finished surfaces. As demonstrated the impacts can be significant and can show a finished surface to be substandard, even if it is not.<\/p>\n<p>When assessing the quality of a finished surface it is important that the impact of glancing light are taken into consideration. Placing an artificial light like a torch against the surface to highlight the imperfections is not generally considered an acceptable assessment. There are recommended minimum distances and light conditions during which an assessment of a surface should be assessed.<\/p>\n<p>Houspect prepares independent building inspections reports for clients involved in WA Building Commission and State Administrative Tribunal matters involving the assessment of finished surfaces in new constructions.<\/p>\n<h2>5\u00a0 \u00a0 \u00a0 Need More Information?<\/h2>\n<p><a href=\"https:\/\/www.dulux.com.au\/applicator\/technical-advice\/preparation\/glancing-light\">https:\/\/www.dulux.com.au\/applicator\/technical-advice\/preparation\/glancing-light<\/a><\/p>\n<p><a href=\"https:\/\/www.publish.csiro.au\/book\/5231\/\">https:\/\/www.publish.csiro.au\/book\/5231\/<\/a><\/p>\n<p><a href=\"http:\/\/www.gyprock.com.au\/Documents\/GYPROCK-482-Glancing_Light-201407.pdf\">http:\/\/www.gyprock.com.au\/Documents\/GYPROCK-482-Glancing_Light-201407.pdf<\/a><\/p>\n<p>&nbsp;<\/p>\n<p>28 August 2018<\/p>\n<p><strong>Build, Buy, Invest in property with confidence.\u00a0 <\/strong><\/p>\n<p><strong><u>Ph <\/u>9240 8855 Web: <\/strong><a href=\"https:\/\/www.houspect.com.au\/wa\">www.houspect.com.au\/wa<\/a><strong> Email: <\/strong><a href=\"mailto:enquiry@houspectwa.com.au\"><strong>enquiry@houspectwa.com.au<\/strong><\/a><\/p>\n<p><a class=\"dt-pswp-item\" href=\"https:\/\/www.houspect.com.au\/wa\/wp-content\/uploads\/sites\/2\/2018\/05\/logo.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-3185\" src=\"https:\/\/www.houspect.com.au\/wa\/wp-content\/uploads\/sites\/2\/2018\/05\/logo-300x119.png\" alt=\"\" width=\"300\" height=\"119\" srcset=\"https:\/\/www.houspect.com.au\/wa\/wp-content\/uploads\/sites\/2\/2018\/05\/logo-300x119.png 300w, https:\/\/www.houspect.com.au\/wa\/wp-content\/uploads\/sites\/2\/2018\/05\/logo.png 535w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a>[\/vc_column_text][\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>[vc_row][vc_column][vc_column_text]Often the impact of light (natural or artificial) on a final surface finish of a building element can have a dramatic effect. On occasions property owners will form the view that the quality of the final finish is unacceptable and a construction defect exists. Sometimes further investigation is warranted. 1\u00a0\u00a0\u00a0\u00a0\u00a0 Glancing Light \u2013 Impacts Let\u2019s&hellip;<\/p>\n","protected":false},"author":9,"featured_media":3362,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[115],"tags":[260,261],"class_list":["post-3352","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-new-construction","tag-impact-of-light","tag-surface-finishes","category-115","description-off"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Construction in WA - Final Surface Finishes and Impact of Light - Building Inspections Perth<\/title>\n<meta name=\"description\" content=\"It is important to know about and understand the impact of light on finished surfaces. 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