FRAMES ON NEW BUILDINGS - NEW DEDUCTION LIMITS FROM 2010
fact with a January 2010, the thermal transmittance U of the "closure include transparent windows" drops by about 10% and more as required by Table 4a of Annex C of the Legislative Decree 192, as amended by Decree 311.Immutati when the values thermal transmittance of glazing that will change only by 1 January 2011, further down. The last variation for the values \u200b\u200bof thermal transmittance of the glass occurred on 1 January 2008 when in fact they were made mandatory in almost all the national territory of the thermal performance of insulating glass reinforced (low emission). remember that they are to be met both the coefficients for both windows and glass .
To clarify what is good for the "closure include transparent windows" thought for the most recent Fortune Presidential Decree 59/2009, which implements the legislative decree 192, which enters into force July 25, 2009. In fact, the Presidential Decree 59/09 states in paragraph c) of Art. 4 that "il valore massimo della trasmittanza (U) delle chiusure apribili ed assimilabili, quali porte, finestre e vetrine anche se non apribili, comprensive degli infissi, considerando le parti trasparenti e/o opache che le compongono, deve rispettare i limiti riportati nelle tabelle 4.a e 4.b al punto 4 dell'allegato C al decreto legislativo". Quindi finestre, vetrine, porte, apribili e non, trasparenti e/o opache devono rispettare le tabella 4a e 4b del dlgs.192 così come modificato dal dlgs. 311. Tra le chiusure trasparenti includiamo anche portoni di ingresso e porte basculanti.
PS: ci raccomandiamo di non confondere questa normativa con quella riguardante i limiti per accedere alle detrazioni del 55% per le quali valgono invece i limiti leggermente più restrittivi del DM 11/03/2008 . .
| Tabella 3. Valori limite della trasmittanza termica U delle chiusure trasparenti comprensive di infissi espressa in W/m2k imposti dal D.lgs. 192/05 e corretto dal D.lgs. 311/06 |
| Zone Climate
| From 1 January 2006
Uw (w/m2k) | From 1 January 2008
Uw (w/m2k) | From 1 January 2010
Uw (w/m2k) |
| A | 5.5 | 5.0 | 4.6 |
| B | 4.0 | 3.6 | 3.0 |
| C | 3.3 | 3.0 | 2.6 |
| D | 3.1 | 2.8 | 2.4 |
| E | 2.8 | 2.5 | 2.2 |
| F | 2.4 | 2.2 | 2.0 |
| Table 4. Limit values \u200b\u200bin U of U glass expressed W/m2k imposed by the Decree. And corrected by legislative decree 192/05. 311/06 |
| Zone Climate
| From 1 January 2006
Ug (w/m2k) | From 1 January 2008
Ug (w/m2k) | From 1 January 2011
Ug (w/m2k) |
| A | 5.0 | 4.5 | 3.7 |
| B | 4.0 | 3.4 | 2.7 |
| C | 3.0 | 2.3 | 2.1 |
| D | 2.6 | 2.1 | 1.9 |
| E | 2.4 | 1.9 | 1.7 |
| F | 2.3 | 1.7 | 1.3 |
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