[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"blog-post-at-what-stage-of-the-build-do-i-need-an-air-tightness-test":3,"atspace-main-nav":305,"atspace-footer-navs":333,"blog-active-tags":455,"blog-active-categories":594},{"data":4},{"id":5,"user_id":6,"slug":7,"full_url":8,"title":9,"excerpt":10,"featured_image":11,"featured_image_alt":10,"data_model":12,"publish_date":47,"is_template":24,"created_at":48,"updated_at":49,"settings":10,"seometa":50,"categories":63,"tags":64,"theme_styles":70,"page_type":10,"linked_page":10},81,1,"at-what-stage-of-the-build-do-i-need-an-air-tightness-test","\u002Fblog\u002Fat-what-stage-of-the-build-do-i-need-an-air-tightness-test","At What Stage of The Build Do I Need an Air Tightness Test?",null,"https:\u002F\u002Fatspace-ltd.s3.eu-west-2.amazonaws.com\u002Fblog-imports\u002Fat20what20stage20of20the20build20do20i20need20an20air20tightness20test.jpg",[13],{"name":14,"id":15,"componentName":16,"bgImage":10,"bgColor":10,"margin":10,"parentAlign":17,"padding":10,"classes":10,"colSpan":10,"cols":18,"colsMD":19,"originalModel":20,"borderWidth":10,"borderColor":10,"borderRadius":10,"sticky":24,"stickyTop":45},"Full Column Block","658cb87a-2082-4494-86ec-9f529ddbc3c1","ColContainer","w-full","grid-cols-1","md:grid-cols-12",[21],[22,29],{"classes":23,"customColSpan":24,"id":25,"colSpan":23,"colSpanSM":26,"colSpanMD":27,"colSpanLG":28,"borderWidth":10,"borderColor":10,"borderRadius":10},"col-span-1",false,"beca360d-7853-405f-b7e3-64ae0506eee3","sm:col-span-12","md:col-span-12","lg:col-span-12",{"name":30,"componentName":16,"nested":31,"cols":18,"colsMD":19,"customColSpan":24,"parentAlign":17,"bgImage":10,"inlineStyles":10,"bgColor":10,"group":32,"margin":10,"padding":10,"classes":10,"colSpan":10,"id":33,"originalModel":34,"borderWidth":10,"borderColor":10,"borderRadius":10,"sticky":24,"stickyTop":45,"containerWidth":46},"Nested Container",true,"main_nested","1c862bc9-a006-4b82-9460-5743aa608d57",[35],[36,38],{"id":37,"colSpan":23,"colSpanSM":26,"colSpanMD":27,"colSpanLG":28,"customColSpan":24,"bgColor":10,"borderWidth":10,"borderColor":10,"borderRadius":10,"classes":10},"7a5a7a1c-0e67-4e11-bfa1-8795bd69d9c0",{"name":39,"componentName":40,"group":41,"margin":10,"padding":10,"classes":10,"bgImage":10,"id":42,"originalModel":43},"WYSIWYG Editor","Wysiwyg","content","073238e2-b0b6-4a59-99f3-d1f10805a444",{"proseEnabled":31,"content":44},"\u003Cp>\u003Cspan data-contrast=\"auto\">Buildings are usually empty when tested, as it makes leakage detection easier if there are any issues with the air tightness test. \u003C\u002Fspan>\u003Cspan data-ccp-props=\"{}\"> \u003C\u002Fspan>\u003C\u002Fp>\n\u003C!--more-->\u003Cp>\u003Cspan data-contrast=\"auto\">Most builders will plan the air test in the program of works before the property is handed over to a client or occupation.\u003C\u002Fspan>\u003Cspan data-ccp-props=\"{}\"> \u003C\u002Fspan>\u003C\u002Fp>\n\u003Cp>\u003Cspan data-contrast=\"auto\">The building should be tested as soon as it is complete, as all the final finish has been completed and the best chance of a successful result is possible. Once the property becomes occupied and lived in, the fabric of the building will change. \u003C\u002Fspan>\u003Cspan data-ccp-props=\"{}\"> \u003C\u002Fspan>\u003C\u002Fp>\n\u003Cp>\u003Cspan data-contrast=\"auto\">This building will settle and breathe. Shrinkage will develop on sealed and floors. By using the heating and ventilation, the air flow in the building will form its natural paths of leakage.\u003C\u002Fspan>\u003Cspan data-ccp-props=\"{}\"> \u003C\u002Fspan>\u003C\u002Fp>\n\u003Cp>\u003Cspan data-contrast=\"auto\">At ATSPACE, we can air test a building if it is empty or occupied. There is however no requirement to have the building empty for an air tightness test.\u003C\u002Fspan>\u003Cspan data-ccp-props=\"{}\"> \u003C\u002Fspan>\u003C\u002Fp>\n\u003Cp>\u003Cspan data-contrast=\"auto\">Air tightness testing is a mandatory requirement of Part L of the building regulations for a new build property, whether residential or commercial. All new build buildings must be tested. For large sites of multiple dwellings, there is a ratio where only a percentage of each house type requires an air tightness test. The building inspector dealing with your project will require a final ‘As built SAP calculation’ or ‘SBEM’ (SAP-Domestic), (SBEM-Commercial), a copy of the air test certificate and EPC to sign off your building.\u003C\u002Fspan>\u003Cspan data-ccp-props=\"{}\"> \u003C\u002Fspan>\u003C\u002Fp>\n\u003Cp>\u003Cspan data-contrast=\"auto\">The air tightness test of a building is guided by a set target within the energy calculation (SAP or SBEM). The overall calculation determines the target figure. This target figure must be met or bettered to pass the air tightness test. Currently, the maximum leakage rate allowed within the energy calculation is 10m3\u002F(hr*m2) @50 Pa. 10 metres cubed per hour per metres squared at 50 pascals of pressure, which in layman’s terms means the building can leak no more than 10 cubic metres (10m3) of air per hour (hr) when the building pressure is at 50 pascals (@50 Pa). The leakage rate is measured against the total metres squared (m2) of the envelope's surface area. The buildings envelope is the total surface area of the floor, external walls and roof. 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