How to Stop Designing Mouldy Buildings (and mainstream the thermal bridge) Simon McGuinness, MRIAI

Transcription

1 How to Stop Designing Mouldy Buildings (and mainstream the thermal bridge) Simon McGuinness, MRIAI

2 TGD - D.2 Mould growth & surface condensation The key factor used in assessing the risk of mould growth or surface condensation in the vicinity of thermal bridges is the temperature factor (frsi). For dwellings, the value of frsi should be greater than or equal to 0.75, so as to avoid the risk of mould growth and surface condensation.

3 TGD - D.2 Mould growth & surface condensation The key factor used in assessing the risk of mould growth or surface condensation in the vicinity of thermal bridges is the temperature factor (frsi). For dwellings, the value of frsi should be greater than or equal to 0.75, so as to avoid the risk of mould growth and surface condensation. For f Rsi > 0.75 T si > 15degC

4 TGD - D.4 Calculation procedures The calculation procedure to establish temperature factor (frsi) is outlined in BRE IP 1/06. Details should be assessed in accordance with the methods described in I.S. EN ISO: Which in turn references I.S. EN ISO:13788 as indispensable for the application of this document.

5 TGD - D.4 Calculation procedures The calculation procedure to establish temperature factor (frsi) is outlined in BRE IP 1/06. Details should be assessed in accordance with the methods described in I.S. EN ISO: Which in turn references I.S. hen ISO:13788 as indispensable for the application of this document.

6 ISO hen 13788: 2012 (December 2013) Walls, Floors, Ceilings frsi calculation 0.25 m2k/w surface resistance 0.25 m2k/w surface resistance 0.25 m2k/w surface resistance

7 ISO hen 13788: 2012 (December 2013) 0.10 ^ 0.13 > 0.25 ^ 0.25 >

8 ISO hen 13788: 2012 (December 2013) 0.10 ^ 0.13 > 0.25 ^ 0.25 >

9 Gable/Eaves cavity wall example ACD 1.09 ACD 1.15

10 Gable/Eaves cavity wall example ACD 1.09 (Eaves) and ACD 1.15 (Gable) Under construction In Dublin in 2015

11 Gable/Eaves cavity wall 3D model

12 3-D Thermal Modelling Fails frsi

13 Add 2.5 thermal blocks & mineral wool

14 Thermal Modelling barely passes frsi

15 What does the responsible educator do? Double-checked the standards Revised the syllabus Warned previous Thermal Modeller graduates Advised the regulators Advised the RIAI Issued three blog postings on BRegsForum Tweeted on social media Asked for clarification from the Minister

16 Minister of State for the Environment, Community and Local Government (Deputy Paudie Coffey) I refer to the reply to Question No. 788 of 15 April 2015 which addressed the approach to calculating the temperature factor in the vicinity of thermal bridges at junctions and around openings in accordance with Appendix D of Technical Guidance Document L

17 Minister of State for the Environment, Community and Local Government (Deputy Paudie Coffey) I refer A surface to the reply resistance to Question value of No is only of 15 used April in very 2015 specific which addressed situations as the outlined approach in section to 4.4 calculating of the EN ISO the temperature standard factor in which the vicinity is of rather of thermal limited bridges relevance at junctions in this context and around and, for openings that reason, in accordance it has not been with referenced Appendix at D of Technical Appendix Guidance D of TGD Document L 2011 or L referred. to in the reply to Question No. 788 of 15 April 2015.

18 Minister of State for the Environment, Community and Local Government (Deputy Paudie Coffey) I refer A surface to the reply resistance to Question value of No is only of 15 used April in very 2015 specific which addressed situations as the outlined approach in section to 4.4 calculating of the EN ISO the temperature standard factor in which the vicinity is of rather of thermal limited bridges relevance at junctions in this context and around and, for openings that reason, in accordance it has not been with referenced Appendix at D of Technical Appendix Guidance D of TGD Document L 2011 or L referred. to in the reply to Question No. 788 of 15 April 2015.

19 Minister of State for the Environment, Community and Local Government (Deputy Paudie Coffey) I refer A surface to the reply resistance to Question value of No is only of 15 used April in very 2015 specific which addressed situations as the outlined approach in section to 4.4 calculating of the EN ISO the temperature standard factor in which the vicinity is of rather of thermal limited bridges relevance at junctions in this context and around and, for openings that reason, in accordance it has not been with referenced Appendix at D of Technical Appendix Guidance D of TGD Document L 2011 or L referred. to in the reply to Question No. 788 of 15 April 2015.

20 Minister of State for the Environment, Community and Local Government (Deputy Paudie Coffey) I refer A surface to the reply resistance to Question value of No is only of 15 used April in very 2015 specific which addressed situations as the outlined approach in section to 4.4 calculating of the EN ISO the temperature standard factor in which the vicinity is of rather of thermal limited bridges relevance at junctions in this context and around and, for openings that reason, in accordance it has not been with referenced Appendix at D of Technical Appendix Guidance D of TGD Document L 2011 or L referred. to in the reply to Question No. 788 of 15 April 2015.?

21 Can the Design Certifier Rely on the ACDs to deliver a Mould-free Compliant Design? On the basis of our work in the last 12 months, it is significantly less than certain that he or she can.

22 Can the Design Certifier Rely on the ACDs to deliver a Mould-free Compliant Design? On the basis of our work in the last 12 months, it is significantly less than certain that he or she can.

23 How did it impact on the DIT nzeb Retrofit Project 2015? Current BER: 363 kwh/m2a Target: 45 kwh/m2a Saving Per Unit: 318 kwh/m2a Cabra alone: 3,800 similar houses Total Savings: 1,208, 400 kwh/m2a Money Saved: 9million per year Would fund 200 retrofits per year In 19 years it would be complete

24 How did it impact on the DIT nzeb Retrofit Project 2015? Current BER: 363 kwh/m2a Target: 45 kwh/m2a Saving Per Unit: 318 kwh/m2a Cabra alone: 3,800 similar houses Total Savings: 1,208, 400 kwh/m2a Money Saved: 9million per year Would fund 200 retrofits per year In 19 years it would be complete

25 Thermal Modelling used to check for frsi

26 Thermal Modelling used to check for frsi

27 Thermal Modelling used to check for frsi

28 How to reduce the cost of retrofit 560 per ACD x 178 ACDs x 2 U-values = 100,000 Would take 3 months and employ 5 researchers, or 10,332 cost per home x 1.3 Million homes = 13,431,600,000

29 How to reduce the cost of retrofit 560 per ACD x 178 ACDs x 2 U-values = 100,000 Would take 3 months and employ 5 researchers, or One of these is cost optimal 10,332 cost per home x 1.3 Million homes = 13,431,600,000

30 The Dublin School of Architecture and Building looks forward to working with Government and the construction industry to resolve all the technical issues necessary to achieve nzeb Retrofit safely, cost effectively and speedily. By working together, we are confident we can achieve our national targets.