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class=\"et_pb_column et_pb_column_2_3 et_pb_column_2_tb_body  et_pb_css_mix_blend_mode_passthrough\">\n\u003Cdiv class=\"et_pb_module et_pb_post_content et_pb_post_content_0_tb_body\">\n\u003Csection class=\"text-token-text-primary w-full focus:outline-none [--shadow-height:45px] has-data-writing-block:pointer-events-none has-data-writing-block:-mt-(--shadow-height) has-data-writing-block:pt-(--shadow-height) [&:has([data-writing-block])>*]:pointer-events-auto [content-visibility:auto] supports-[content-visibility:auto]:[contain-intrinsic-size:auto_100lvh] R6Vx5W_threadScrollVars scroll-mb-[calc(var(--scroll-root-safe-area-inset-bottom,0px)+var(--thread-response-height))] scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\" dir=\"auto\" data-turn-id=\"request-WEB:b385a407-4f3c-49d6-b29e-8a7d8d96a91f-18\" data-testid=\"conversation-turn-38\" data-scroll-anchor=\"false\" data-turn=\"assistant\">\n\u003Cdiv class=\"text-base my-auto mx-auto pb-10 [--thread-content-margin:var(--thread-content-margin-xs,calc(var(--spacing)*4))] @w-sm\u002Fmain:[--thread-content-margin:var(--thread-content-margin-sm,calc(var(--spacing)*6))] @w-lg\u002Fmain:[--thread-content-margin:var(--thread-content-margin-lg,calc(var(--spacing)*16))] px-(--thread-content-margin)\">\n\u003Cdiv class=\"[--thread-content-max-width:40rem] @w-lg\u002Fmain:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\u002Fturn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\">\n\u003Cdiv class=\"flex max-w-full flex-col gap-4 grow\">\n\u003Cdiv data-message-author-role=\"assistant\" data-message-id=\"063c9420-4241-4585-be40-3b97df5a76dd\" dir=\"auto\" data-message-model-slug=\"gpt-5-3-mini\" class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal outline-none keyboard-focused:focus-ring [.text-message+&]:mt-1\" data-turn-start-message=\"true\" tabindex=\"0\">\n\u003Cdiv class=\"flex w-full flex-col gap-1 empty:hidden\">\n\u003Cdiv class=\"markdown prose dark:prose-invert w-full wrap-break-word light markdown-new-styling\">\n\u003Ch3 data-section-id=\"1n79fe9\" data-start=\"685\" data-end=\"706\">Project details\u003C\u002Fh3>\n\u003Cp data-start=\"707\" data-end=\"1150\">Service: PSI value calculations (thermal bridging calculations)\u003Cbr data-start=\"770\" data-end=\"773\">Client: UK residential developer\u003Cbr data-start=\"805\" data-end=\"808\">Project: 28-unit mixed housing scheme (semi-detached and terraced new build homes)\u003Cbr data-start=\"890\" data-end=\"893\">Location: Northampton NN4 \u003Cbr data-start=\"962\" data-end=\"965\">Regulation driver: Building Regulations Part L (energy efficiency and thermal bridging compliance)\u003Cbr data-start=\"1063\" data-end=\"1066\">ATSPACE team: Building energy compliance consultants, thermal bridging specialists\u003C\u002Fp>\n\u003Ch3 data-section-id=\"fgn2hc\" data-start=\"1152\" data-end=\"1177\">The headline result\u003C\u002Fh3>\n\u003Cp data-start=\"1178\" data-end=\"1352\">ATSPACE delivered thermal bridging calculations supporting full compliance across a 28-unit housing scheme, achieving Part L approval first time without redesign or delays.\u003C\u002Fp>\n\u003Cp data-start=\"1354\" data-end=\"1698\">The project required detailed PSI value analysis across all key junctions to ensure energy performance targets were met within SAP and Building Regulations requirements. Through accurate thermal bridging calculations and early design-stage input, ATSPACE helped the project team secure compliance efficiently and maintain programme certainty.\u003C\u002Fp>\n\u003Cp data-start=\"1700\" data-end=\"2029\">ATSPACE delivered:\u003Cbr data-start=\"1718\" data-end=\"1721\">Full thermal bridging (PSI value) calculation set\u003Cbr data-start=\"1770\" data-end=\"1773\">Assessment of all key junction details across dwelling types\u003Cbr data-start=\"1833\" data-end=\"1836\">Part L compliance support for housing scheme\u003Cbr data-start=\"1880\" data-end=\"1883\">SAP-ready thermal bridging inputs\u003Cbr data-start=\"1916\" data-end=\"1919\">Review of construction detailing and insulation continuity\u003Cbr data-start=\"1977\" data-end=\"1980\">Building Control-ready compliance documentation\u003C\u002Fp>\n\u003Ch3 data-section-id=\"12t9m4w\" data-start=\"2031\" data-end=\"2053\">Project overview\u003C\u002Fh3>\n\u003Cp data-start=\"2054\" data-end=\"2315\">This project involved a 28-unit residential housing scheme consisting of semi-detached and terraced new build homes. The development was designed to deliver affordable housing while meeting modern energy efficiency standards under Building Regulations Part L.\u003C\u002Fp>\n\u003Cp data-start=\"2317\" data-end=\"2607\">As part of compliance requirements, the developer needed to demonstrate that thermal bridging had been properly assessed across all building junctions. This is essential in housing schemes where repeated detailing across multiple units can significantly affect overall energy performance.\u003C\u002Fp>\n\u003Cp data-start=\"2609\" data-end=\"2814\">ATSPACE was appointed to complete thermal bridging calculations using PSI values to ensure compliance could be demonstrated consistently across all dwellings without impacting the construction programme.\u003C\u002Fp>\n\u003Ch3 data-section-id=\"139icz0\" data-start=\"2816\" data-end=\"2845\">Why the service matters\u003C\u002Fh3>\n\u003Cp data-start=\"2846\" data-end=\"3112\">Thermal bridging calculations assess heat loss at junctions where building elements meet, such as walls, floors, roofs, windows and doors. These junctions can significantly affect overall building performance, even when insulation levels meet regulatory standards.\u003C\u002Fp>\n\u003Cp data-start=\"3114\" data-end=\"3275\">Under Part L of the Building Regulations, thermal bridging must be correctly accounted for using PSI values to ensure accurate energy modelling and compliance.\u003C\u002Fp>\n\u003Cp data-start=\"3277\" data-end=\"3481\">This service is essential for:\u003Cbr data-start=\"3307\" data-end=\"3310\">New build housing schemes\u003Cbr data-start=\"3335\" data-end=\"3338\">Energy compliance submissions for Building Control\u003Cbr data-start=\"3388\" data-end=\"3391\">SAP assessments and Part L calculations\u003Cbr data-start=\"3430\" data-end=\"3433\">Developments using modern insulation standards\u003C\u002Fp>\n\u003Cp data-start=\"3483\" data-end=\"3724\">Thermal bridging calculations ensure that:\u003Cbr data-start=\"3525\" data-end=\"3528\">Heat loss at junctions is properly quantified\u003Cbr data-start=\"3573\" data-end=\"3576\">Energy efficiency targets are achieved\u003Cbr data-start=\"3614\" data-end=\"3617\">SAP results accurately reflect construction performance\u003Cbr data-start=\"3672\" data-end=\"3675\">Building Regulations compliance is demonstrated\u003C\u002Fp>\n\u003Cp data-start=\"3726\" data-end=\"3888\">If thermal bridging is not correctly assessed, housing schemes may face SAP failure, delayed approvals, or the need for costly design revisions at a late stage.\u003C\u002Fp>\n\u003Ch3 data-section-id=\"11s12pg\" data-start=\"3890\" data-end=\"3907\">The problem\u003C\u002Fh3>\n\u003Cp data-start=\"3908\" data-end=\"4105\">When ATSPACE was appointed, the housing scheme design was already well developed, with construction details largely finalised. However, several thermal bridging risks had not been fully assessed.\u003C\u002Fp>\n\u003Cp data-start=\"4107\" data-end=\"4417\">Key issues included:\u003Cbr data-start=\"4127\" data-end=\"4130\">Unverified junction details across multiple dwelling types\u003Cbr data-start=\"4188\" data-end=\"4191\">Inconsistent insulation continuity at key interfaces\u003Cbr data-start=\"4243\" data-end=\"4246\">Reliance on default PSI values in early energy models\u003Cbr data-start=\"4299\" data-end=\"4302\">Variations in construction detailing between house types\u003Cbr data-start=\"4358\" data-end=\"4361\">Tight programme requiring fast compliance confirmation\u003C\u002Fp>\n\u003Cp data-start=\"4419\" data-end=\"4554\">There was also pressure to maintain standardised construction methods across the scheme to control costs and ensure build efficiency.\u003C\u002Fp>\n\u003Cp data-start=\"4556\" data-end=\"4759\">Without accurate thermal bridging calculations, there was a risk that SAP assessments would not reflect real performance, potentially resulting in non-compliance or delays in Building Control approval.\u003C\u002Fp>\n\u003Ch3 data-section-id=\"jlughc\" data-start=\"4761\" data-end=\"4795\">What ATSPACE was asked to do\u003C\u002Fh3>\n\u003Cp data-start=\"4796\" data-end=\"5139\">Carry out thermal bridging (PSI value) calculations for housing scheme\u003Cbr data-start=\"4866\" data-end=\"4869\">Assess all key junctions across dwelling types\u003Cbr data-start=\"4915\" data-end=\"4918\">Confirm Part L compliance requirements\u003Cbr data-start=\"4956\" data-end=\"4959\">Provide accurate inputs for SAP assessments\u003Cbr data-start=\"5002\" data-end=\"5005\">Identify and mitigate thermal performance risks\u003Cbr data-start=\"5052\" data-end=\"5055\">Support Building Control approval process\u003Cbr data-start=\"5096\" data-end=\"5099\">Deliver clear compliance documentation\u003C\u002Fp>\n\u003Ch3 data-section-id=\"bmbyk8\" data-start=\"5141\" data-end=\"5159\">Our approach\u003C\u002Fh3>\n\u003Cp data-start=\"5160\" data-end=\"5455\">Step 1: Understanding the compliance requirement\u003Cbr data-start=\"5208\" data-end=\"5211\">ATSPACE confirmed the Part L requirements relating to thermal bridging and defined the calculation methodology required for multi-unit housing schemes. We established a structured PSI value approach to ensure consistency across all dwellings.\u003C\u002Fp>\n\u003Cp data-start=\"5457\" data-end=\"5787\">Step 2: Reviewing junction details and construction drawings\u003Cbr data-start=\"5517\" data-end=\"5520\">We reviewed architectural and construction information, focusing on key junctions including wall-to-floor connections, roof interfaces, window reveals, and party wall junctions. This allowed us to identify potential heat loss risks and inconsistencies in detailing.\u003C\u002Fp>\n\u003Cp data-start=\"5789\" data-end=\"6218\">Step 3: Practical thermal performance optimisation\u003Cbr data-start=\"5839\" data-end=\"5842\">Before finalising calculations, ATSPACE provided targeted recommendations, including improving insulation continuity at key junctions, refining window and door reveal details, reducing thermal bridging at floor slab edges, and aligning construction details across all housing types. These improvements were incorporated into the calculation model without requiring redesign.\u003C\u002Fp>\n\u003Cp data-start=\"6220\" data-end=\"6481\">Step 4: Clear compliance reporting\u003Cbr data-start=\"6254\" data-end=\"6257\">ATSPACE completed thermal bridging calculations and issued structured PSI value outputs suitable for SAP and Building Control submission. The documentation confirmed full Part L compliance across the entire housing scheme.\u003C\u002Fp>\n\u003Ch3 data-section-id=\"176e6rf\" data-start=\"6483\" data-end=\"6532\">Real issues we faced and how we solved them\u003C\u002Fh3>\n\u003Cp data-start=\"6533\" data-end=\"6778\">Issue A: inconsistent junction detailing across units\u003Cbr data-start=\"6586\" data-end=\"6589\">Different house types used slightly different construction details.\u003Cbr data-start=\"6656\" data-end=\"6659\">How ATSPACE helped: We standardised PSI calculation assumptions to ensure consistent compliance across all dwellings.\u003C\u002Fp>\n\u003Cp data-start=\"6780\" data-end=\"6988\">Issue B: reliance on default thermal bridging values\u003Cbr data-start=\"6832\" data-end=\"6835\">Early energy models used generic PSI values.\u003Cbr data-start=\"6879\" data-end=\"6882\">How ATSPACE helped: We replaced default assumptions with project-specific thermal bridging calculations.\u003C\u002Fp>\n\u003Cp data-start=\"6990\" data-end=\"7206\">Issue C: risk of SAP performance failure\u003Cbr data-start=\"7030\" data-end=\"7033\">Initial modelling showed borderline energy performance results.\u003Cbr data-start=\"7096\" data-end=\"7099\">How ATSPACE helped: We refined PSI inputs to improve SAP outcomes without changing design specifications.\u003C\u002Fp>\n\u003Cp data-start=\"7208\" data-end=\"7448\">Issue D: fast-track programme requirements\u003Cbr data-start=\"7250\" data-end=\"7253\">The project required rapid submission for Building Control approval.\u003Cbr data-start=\"7321\" data-end=\"7324\">How ATSPACE helped: We prioritised delivery of thermal bridging calculations to meet programme deadlines and avoid delays.\u003C\u002Fp>\n\u003Ch3 data-section-id=\"1j6c1zw\" data-start=\"7450\" data-end=\"7463\">Results\u003C\u002Fh3>\n\u003Cp data-start=\"7464\" data-end=\"7759\">Thermal bridging calculations completed for all 28 homes\u003Cbr data-start=\"7520\" data-end=\"7523\">Part L compliance achieved first time\u003Cbr data-start=\"7560\" data-end=\"7563\">No redesign required\u003Cbr data-start=\"7583\" data-end=\"7586\">SAP inputs validated and improved\u003Cbr data-start=\"7619\" data-end=\"7622\">Building Regulations approval supported successfully\u003Cbr data-start=\"7674\" data-end=\"7677\">No delay to construction programme\u003Cbr data-start=\"7711\" data-end=\"7714\">Consistent compliance across housing scheme\u003C\u002Fp>\n\u003Ch3 data-section-id=\"1bmn0eq\" data-start=\"7761\" data-end=\"7791\">What this project proves\u003C\u002Fh3>\n\u003Cp data-start=\"7792\" data-end=\"7929\">This project demonstrates that thermal bridging calculations are essential for achieving reliable Part L compliance in housing schemes.\u003C\u002Fp>\n\u003Cp data-start=\"7931\" data-end=\"8156\">When completed early and accurately, they ensure SAP assessments reflect real construction performance, reduce compliance risk across multiple dwelling types, and support smooth Building Regulations approval without delays.\u003C\u002Fp>\n\u003Cp data-start=\"8158\" data-end=\"8291\">Thermal bridging calculations are a critical part of delivering energy-efficient housing developments efficiently and consistently.\u003C\u002Fp>\n\u003Ch3 data-section-id=\"icdteb\" data-start=\"8293\" data-end=\"8307\">Mini FAQ\u003C\u002Fh3>\n\u003Cp data-start=\"8308\" data-end=\"8452\">What are thermal bridging calculations?\u003Cbr data-start=\"8347\" data-end=\"8350\">They are assessments that measure heat loss at junctions between building elements using PSI values.\u003C\u002Fp>\n\u003Cp data-start=\"8454\" data-end=\"8604\">Why are thermal bridging calculations required?\u003Cbr data-start=\"8501\" data-end=\"8504\">They are required under Part L to ensure accurate energy performance modelling in SAP assessments.\u003C\u002Fp>\n\u003Cp data-start=\"8606\" data-end=\"8756\">Do all housing schemes need PSI value calculations?\u003Cbr data-start=\"8657\" data-end=\"8660\">Yes, most new build housing developments require thermal bridging calculations for compliance.\u003C\u002Fp>\n\u003Cp data-start=\"8758\" data-end=\"8906\">What happens if thermal bridging is not assessed?\u003Cbr data-start=\"8807\" data-end=\"8810\">SAP calculations may be inaccurate, leading to potential non-compliance or delays in approval.\u003C\u002Fp>\n\u003Cp data-start=\"8908\" data-end=\"9059\">Can thermal bridging issues be fixed without redesign?\u003Cbr data-start=\"8962\" data-end=\"8965\">Yes, in many cases performance can be improved through detailing or calculation adjustments.\u003C\u002Fp>\n\u003Cp data-start=\"9061\" data-end=\"9222\">When should thermal bridging calculations be completed?\u003Cbr data-start=\"9116\" data-end=\"9119\">They should be completed during the design stage before SAP submission and Building Control approval.\u003C\u002Fp>\n\u003Ch3 data-section-id=\"gdtiox\" data-start=\"9224\" data-end=\"9244\">Call to action\u003C\u002Fh3>\n\u003Cp data-start=\"9245\" data-end=\"9306\">Need thermal bridging calculations for your housing scheme?\u003C\u002Fp>\n\u003Cp data-start=\"9308\" data-end=\"9544\" data-is-last-node=\"\" data-is-only-node=\"\">ATSPACE helps developers, architects and contractors achieve fast, reliable Part L compliance with accurate PSI value calculations and clear technical reporting. 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