Thermal Bridges in new Dwellings..... Accredited details – Designing & detailing for Compliance Danny Kearney Main changes to Part F for dwellings

Regulations Part F 2012 – Compliance Fabric Solutions & Thermal Bridging 2 31 st Jan 2013 Lisburn and Castlereagh City Council Xtratherm – Expect More

Presentation - Danny Kearney Group Technical Manager Contact - 3 Xtratherm – Expect More

1.Explain the 3 components to fabric performance – how do they compare? U-values Air tightness Thermal Bridging 2.Take a semi and look at compliance specifications 3.Calculating your Y value. 4.Where is it likely to end up? 5.(Zero Carbon Standard & FEEs) Xtratherm – Expect More

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Criteria 1 – Achieving the TER Design stage Calculate CO 2 emissions for the proposed building – using SAP Criteria 2 – Minimum Acceptable Stds Design Stage Keep within Design limits set in Document Criteria 3 – Limit Overheating Design Stage Limit Solar Gains in Summer (Over Heating) Criteria 4 – Const Quality & Commis. Post Construction Check Quality of Construction and commissioning of building services Criteria 5 – Instruction for operation Post Construction Provide Information to the home owner 7 Xtratherm – Expect More

Criteria 4 – Const Quality & Commis. Post Construction Evidence As stated in paragraph 2.21, a recalculation of the DER is required to be given to the district council not more than 5 days after completion of the dwelling taking into account any changes in performance between design and construction and the achieved air permeability and to demonstrate that the DER for the dwelling as constructed meets its TER. Building envelope 2.43 The building envelope should be constructed to a reasonable standard such that the insulation is reasonably continuous over the whole building envelope and the actual air permeability is within the set limits. Party Walls Sealing must be effective – Robust (Sound Detailing) must be taken into account. Thermal bridges 2.51 The building fabric should be constructed so that there are no reasonably avoidable thermal bridges in the insulation layers caused by gaps within the various elements, at joints between elements, and at the edges of elements such as those around window and door openings. Criteria 4 Quality & Commisioning The TER and DER for the dwelling should be included with the operating and maintenance instructions together with the data used to calculate them. This should include an electronic copy of the TER/DER data input file for the dwelling to facilitate any future analysis that may be required by the owner when altering or improving the dwelling.

Pressure testing – Penalties Added (i) where the dwelling has been pressure tested, the assessed air permeability is the measure air permeability; or (ii) where the dwelling has not been pressure tested, the assessed air permeability is the average result obtained from pressure tests on other dwellings of the same type on the development increased by a margin of +2 m 3 /(h.m 2 ) at 50 Pa; or (iii) on small developments, where the person carrying out the work has opted to avoid testing the assessed air permeability is 15 m 3 /(h.m 2 ) at 50 Pa. Accredited Detailing - Penalties Added If not calculated – PSI values MUST be taken from SAP 2009 Table Either Default or Accredited 9 Criteria 4 Quality - PENALTIES NO EVIDENCE? - Penalties Will Be Added Xtratherm – Expect More

So how to comply? U-values Airtightness Thermal Bridging Xtratherm – Expect More

Code for Sustainable Homes? 11 F1 same as Code 3 FEES introduced FEES will lead Regulations Eng & Wales Xtratherm – Expect More

Compliance with Part F 2012 using SAP So – What needs done? Xtratherm – Expect More

How to achieve compliance – the 25% 13 RESULTSTERDER ElementSpecResult Wall100mm CavityTherm 0.20 Floor100mm Hyfloor0.16 Ceiling300mm Fibre0.15 GlazingDouble1.6 DoorsDouble % EE Lighting – 90% Combi Gas Boiler – Full TT Zoning - Other BlockDense Mech VentilationNone RenewablesNone Permeability5 Bridging Y value Xtra Details 0.04 Compliance 1 Good detailing Xtratherm – Expect More

Partial Fill Cavity Wall using foiled faced PIR 14 Meeting the U-values: Walls - Partial Fill Xtratherm – Expect More

Full Fill Cavity Wall PIR Meeting the U-values: Walls - Full Fill Built in Xtratherm – Expect More

Floors using foiled faced PIR 16 Meeting the U-values: Floors Xtratherm – Expect More

Roof – Slope using foiled faced PIR 17 Meeting the U-values: Roofs - Slope Xtratherm – Expect More

Roof - Ceiling using foiled faced PIR 18 Meeting the U-values: Ceilings Xtratherm – Expect More

Full Fill Pumped 19 Meeting the U-values: Walls - Full Fill Built in 175mm – 0.21 U-Value Y-value: Detailing? Cost Report available Xtratherm – Expect More

PARTIAL FILL SQUARE or T&G Meeting the U-values: Walls - Full Fill Built in Did you know – There a U-value penalty of 0.01 if your boards are not engineered jointed? Xtratherm – Expect More

21 Taking the same house – Calculating the actual Y-value using the: Length of each junction The PSI value of each junction The total area of heat loss (Envelope area) Thermal Bridging Taking advantage Xtratherm – Expect More

Non–Repeating Thermal Bridges. Account for 30% of heat loss from a well insulated house Cold spots cause condensation and mould growth MUST be measured under part F Account as a Y-factor in SAP 22 Xtratherm – Expect More

Each Junction has a PSI value – found in Table K of SAP 2009 Either DEFAULT or ACCREDITED Or Use measured performance from accredited source Xtratherm – Expect More

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Criteria 4 – Thermal Bridging – Accredited Details Bridging Calculation to BRE Report BR 497 Conventions for calculating linear thermal transmittance and temperature factors. ….no worse than (Default) in BRE IP 1/06 or Table K in SAP …….that an appropriate system of site inspection is in place Dwellings constructed to quality assured accredited construction details? Where quality assured accredited construction details the calculated linear thermal transmittance can be used …….. Schemes that provide such construction details also accredit and quality assure the calculation of the linear thermal transmittance, accredit the details in terms of buildability and have an associated quality assurance regime that inspects a sample of sites to confirm that the details are being used correctly. CURRENTLY NOT AVAILABLE ANYWHERE 26 Criteria 4 Quality & Commisioning Xtratherm – Expect More

Semi Detached House TER Total Envelope Area = Xtratherm – Expect More

How to achieve compliance – the 25% 28 RESULTSTERDER ElementSpecResult Wall100mm CavityTherm 0.20 Floor100mm Hyfloor0.16 Ceiling300mm Fibre0.15 GlazingDouble1.6 DoorsDouble % EE Lighting – 90% Combi Gas Boiler – Full TT Zoning - Other BlockDense Mech VentilationNone RenewablesYES2m 2 Solar HW Permeability5 Bridging Y value Accredited0.08 Compliance 2 Accredited detailing Xtratherm – Expect More

How to achieve compliance – the 25% 29 RESULTSTERDER ElementSpecResult Wall100mm CavityTherm 0.20 Floor100mm Hyfloor0.16 Ceiling300mm Fibre0.15 GlazingDouble1.6 DoorsDouble % EE Lighting – 90% Combi Gas Boiler – Full TT Zoning - Other BlockDense Mech Ventilation Required RenewablesYES 5m 2 Solar HW????? Permeability <4 Bridging Y valueDefault0.15 Compliance 3 Default detailing Xtratherm – Expect More

30 THERMAL BRIDGING – What are Accredited/Acceptable Details Thermal Bridging Taking advantage

31 Xtratherm Accredited Detailing Based on UK & NI Accredited and Acceptable Details – same inspection and reporting regime. Keep it simple. Xtratherm – Expect More

Where’s the end game? 32 Xtratherm – Expect More

Fabric Energy Efficiency Standard (FEES or ‘full FEES’). …..the Government has committed to introducing a fabric standard for zero carbon homes, but up until now has not stated when or how such a standard will start to be introduced …. 33 CSH Updated Oct 2010 ‘’The adoption of the Code for Sustainable Homes states the intended direction of future changes to Part L of the Building Regulations, which will make dramatic improvements in reducing CO2. Xtratherm – Expect More

New for 2010 CSH 34

35 The metric is kWh/m²/yr covering space heating and space cooling energy demand (modelled utilising a notional dwelling assuming natural ventilation and excluding any internal gains from the domestic hot water system) LOOK FOR FEEs SCORE ON YOUR SAP Xtratherm – Expect More

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37 Crest Nicholson - Epsom Barrett Const - Corby Xtratherm – Expect More

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39 Thermal Bridges – such as at stepped cavity trays have until now been ignored – they MUST now be accounted for. Insulate behind the line of trays – How does pumped insulation reach these areas? Xtratherm – Expect More

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41 Why Xtratherm? BBA U-value and Condensation risk analysis competency scheme x 4 ISO 9001 | Quality Management Systems ISO 14001| Environmental Management OHSAS | Occupational Health & Safety Technical Services Xtratherm – Expect More

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