{"id":26090,"date":"2016-06-23T14:46:54","date_gmt":"2016-06-23T14:46:54","guid":{"rendered":"http:\/\/planningandbuildingcontroltoday.co.uk\/?p=24688"},"modified":"2016-09-20T13:09:27","modified_gmt":"2016-09-20T13:09:27","slug":"get-u-values-right-start","status":"publish","type":"post","link":"https:\/\/www.pbctoday.co.uk\/news\/energy-news\/get-u-values-right-start\/26090\/","title":{"rendered":"How to get U-values right from the start"},"content":{"rendered":"

Advice on correctly calculating U-values for inverted roof constructions are provided here from Karen Everitt, Product Manager of Polyfoam\u00aeXPS at Knauf Insulation\u2026<\/span><\/h2>\n

In the construction industry, energy e\ufb03ciency is a key consideration during both the design of the building and throughout its ongoing use. Therefore, specifying the correct U-values for the building fabric is of utmost importance because it forms the basis of any energy or carbon reduction performance assessment. In practice, nearly every external building element has to comply with thermal standards that are expressed as a limiting U-value and is a requirement of Building Regulations.<\/p>\n

For that reason, it is crucial when specifying thermal insulation, that installers are con\ufb01dent that the product manufacturer is providing the correct U-value calculation for applications, including inverted roofs. Ignoring them can lead to a signi\ufb01cant underestimate of the amount of insulation required to achieve a target U-value.<\/p>\n

The measure of heat loss associated with a building element can be calculated quickly using U-value calculation software. However, when it comes to inverted roofs, there are a number of vital factors that must be taken into account.<\/p>\n

Rainwater Cooling<\/span><\/h2>\n

In an inverted \ufb02at roof construction, the insulation is placed above the waterproo\ufb01ng layer. While this brings advantages for the application, it can introduce an additional mechanism for heat loss; if permitted, rainwater will \ufb02ow beneath the insulation boards and remove heat directly from the building fabric before \ufb01nally running o\ufb00 the roof and down the rainwater drainage outlet. This is commonly known as the Rainwater Cooling e\ufb00ect and must be taken into account when calculating the U-value.<\/p>\n

The Rainwater Cooling e\ufb00ect can be reduced by adding a water-reducing layer over the insulation and is an essential addition to the inverted roof insulation system. For this reason, Slimline Zero Membrane is used with Polyfoam\u00aeECO Roofboard Extra as an integral part of the BBA approved Knauf Insulation Roof System.<\/p>\n

Inverted roof U-value calculations are produced in accordance with BS EN ISO 6946:2007 adding a correction, known as Delta U. It takes into account the average rainfall in the building\u2019s location and the percentage of the rainfall reaching the waterproo\ufb01ng layer.<\/p>\n

If a water-reducing layer is not used and rainwater cooling is not minimised, there will be a dramatic increase in the insulation thickness needed to achieve the required U-value. For example, to achieve a U-value of 0.20W\/m2K using a water-reducing layer, such as Slimline Zero membrane with Polyfoam\u00aeECO Roofboard Extra, 160mm of material is required. By omitting the water-reducing layer, the thickness of insulation increases to 400mm.<\/p>\n

Design and declared lambda values<\/span><\/h2>\n

In addition to this, we must also assess the individual materials that make up the construction element and know their respective thermal resistance (which is derived from the thermal conductivity \u2013 also known as lambda value \u2013 and thickness). For any building material used including insulation layers, manufacturers are required to provide accurate information for insulation products used in the U-value calculation.<\/p>\n

The declared lambda value (thermal conductivity) refers to the value that is obtained for 90% of production, with a 90% con\ufb01dence level, thus increasing assurance in the product\u2019s thermal performance. In essence, it is the thermal conductivity of the product when it leaves the factory.<\/p>\n

In practice though, the insulation in an inverted roof is subjected to environmental conditions (rainfall as well as freeze-thaw and moisture absorption by di\ufb00usion), which can have an e\ufb00ect on the e\ufb03ciency of the thermal insulation.<\/p>\n

Best practice and guidance on the design of inverted roofs can be found in the European Technical Approval Guidance (ETAG 031-1), which con\ufb01rms that the declared lambda value should be corrected to take into account the roof construction and local climate conditions.<\/p>\n

ETAG 031-1 states that the possible moisture absorption over time a\ufb00ects the e\ufb03ciency of thermal insulation. Therefore, thermal values need to be corrected by assessing the total water absorption potential. By applying moisture correction factors, (in accordance with BS EN ISO 10456) the insulation is assigned a design lambda value, and it is these values which ETAG 031-1 state should be used in any U-value calculations for inverted roof systems.<\/p>\n

In practice, due to the nature of the exposed conditions, only extruded and expanded polystyrene are suitable for inverted roof applications. In general, the moisture corrected design lambda values favour extruded polystyrene (XPS) products over expanded polystyrene (EPS) as the correction factor from declared to design lambda values can be far less. In simple terms, by using the lower XPS design lambda insulation boards, you will require less insulation to meet the U-value requirement.<\/p>\n

To achieve a U-value of 0.18W\/m2K, typical thicknesses are required:<\/strong><\/p>\n\n\n\n\n\n
\n

XPS\/EPS<\/strong><\/p>\n<\/td>\n

\n

XPS<\/strong><\/p>\n<\/td>\n

\n

EPS<\/strong><\/p>\n<\/td>\n<\/tr>\n

\n

Declared lambda value of – 0.033<\/p>\n<\/td>\n

\n

Design lambda value of – 0.034<\/p>\n<\/td>\n

\n

Design lambda value of\u00a0 – 0.038<\/p>\n<\/td>\n<\/tr>\n

\n

175<\/p>\n<\/td>\n

\n

180<\/p>\n<\/td>\n

\n

200<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

For example, an extruded polystyrene insulant such as our Polyfoam\u00aeECO Roofboard is the ideal thermal insulation for an inverted roof, as it bene\ufb01ts from closed cell technology. It is highly moisture resistant and has high compressive strength, thereby delivering a robust solution.<\/p>\n

Designers should, therefore, liaise with a reputable insulation manufacturer to obtain the correct design lambda value and rainwater cooling correction factor for inverted roof applications, to ensure the target U-value is achieved \u2013 and the roof fully complies with the Building Regulations.<\/p>\n

Knauf Insulation is a fully accredited member of the prestigious and industry leading TIMSA\/British Board of Agr\u00e9ment (BBA) U-value and Condensation Calculation Competency Scheme. This provides speci\ufb01ers and contractors with utmost con\ufb01dence that the inverted roof U-value and condensation calculations supplied by the UK\u2019s leading insulation manufacturer are in line with all the relevant industry standards.<\/p>\n

For more information, please visit www.knau\ufb01nsulation.co.uk\/roofboard-extra<\/span><\/a><\/p>\n

Karen Everitt<\/strong><\/p>\n

Product Manager of Polyfoam\u00aeXPS<\/p>\n

Knauf Insulation<\/p>\n

01744 76 66 66<\/p>\n

technical.uk@knau\ufb01nsulation.com<\/p>\n

www.knau\ufb01nsulation.co.uk<\/span><\/a><\/p>\n

@KnaufUK<\/a><\/span><\/p>\n

\n<\/div>","protected":false},"excerpt":{"rendered":"

Advice on correctly calculating U-values for inverted roof constructions are provided here from Karen Everitt, Product Manager of Polyfoam\u00aeXPS at Knauf Insulation\u2026 In the construction industry, energy e\ufb03ciency is a key consideration during both the design of the building and throughout its ongoing use. Therefore, specifying the correct U-values for the building fabric is of […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[307],"tags":[],"stakeholder_rel_tag":[],"contributor_rel_tag":[],"class_list":{"0":"post-26090","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-energy-news"},"acf":[],"yoast_head":"\nHow to get U-values right from the start | Planning, Building & Construction Today<\/title>\n<meta name=\"description\" content=\"Advice on correctly calculating U-values for inverted roof constructions are provided here from Karen Everitt, Product Manager of Polyfoam\u00aeXPS at Knauf Insulation\u2026\" \/>\n<meta name=\"robots\" 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