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{"id":3489,"date":"2023-02-17T10:45:16","date_gmt":"2023-02-17T09:45:16","guid":{"rendered":"https:\/\/costruireinqualita.it\/verona\/?p=3489"},"modified":"2023-02-17T10:46:41","modified_gmt":"2023-02-17T09:46:41","slug":"ponti-termici-e-muffa","status":"publish","type":"post","link":"https:\/\/cqwp.demoaddsolution.it\/verona\/ponti-termici-e-muffa\/","title":{"rendered":"Ponti termici e muffa: una storia infinit\u00e0?"},"content":{"rendered":"

Prosegue la nuova rubrica<\/strong>\u00a0“da Domande a Sapere”.<\/p>\n

Serie di articoli pensati per raccogliere e rispondere alle domande che abbiamo ricevuto da tuoi colleghi, professionisti e costruttori, che incontriamo nei corsi e convegni.<\/p>\n


\n

In questo articolo parleremo di:<\/strong><\/p>\n

In particolare approfondiremo interrogativi come:<\/p>\n

\u2013 Cosa sono i ponti termici?<\/p>\n

\u2013 Perch\u00e9 le muffe si formano negli angoli?<\/p>\n

\u2013 Risolvere i ponti termici. Alcune soluzioni.<\/p>\n

 <\/p>\n

 <\/p>\n

La domanda di oggi:\u00a0<\/strong><\/h3>\n

Un ponte termico pu\u00f2 essere geometrico, ovvero un angolo con muratura uniforme senza pilastro? Perch\u00e9 le muffe si riscontrano in maggioranza negli angoli?<\/em><\/p><\/blockquote>\n

\"\"<\/p>\n

Formazione di muffe interne ad un appartamento.<\/em><\/p>\n

 <\/p>\n

 <\/p>\n

La progettazione dell\u2019involucro \u00e8 determinate per evitare queste conseguenze, e non solo. Nello scorso articolo abbiamo anticipato un tema molto importante: la necessariet\u00e0 della progettazione esecutiva.<\/p>\n

Ma torniamo a noi\u2026<\/p>\n

Cosa sono i ponti termici?<\/strong><\/h2>\n

I ponti termici sono zone dell\u2019edificio dove varia\u00a0la resistenza termica<\/span>*<\/strong>\u00a0dell\u2019involucro. Questa variazione tipicamente \u00e8 in diminuzione ovvero:\u00a0minore resistenza termica \u00e0 maggiori dispersioni di calore<\/span><\/strong>.<\/p>\n

*<\/strong>Resistenza termica: possiamo immaginarla come il contrasto che il nostro involucro esercita per evitare che il calore lo attraversi. Valori bassi poca resistenza, valori alti elevata resistenza.<\/span><\/em><\/p>\n

Possiamo riconoscere tre diverse tipologie di ponte termico:<\/strong><\/p>\n

\u2013 Ponte termico geometrico<\/strong>. La variazione della trasmissione di calore \u00e8 data dalla differenza tra superficie interna ed esterna. Per esempio gli angoli di un fabbricato.<\/p>\n

\u2013 Ponte termico strutturale.<\/strong> La variazione della resistenza termica deriva da una diversit\u00e0 di materiale, di stratigrafia. Per esempio in prossimit\u00e0 di pilastri in calcestruzzo in strutture a telaio.<\/p>\n

\u2013 Ponte termico geometrico e strutturale<\/strong>. Il pi\u00f9 ostico; la somma di entrambe le tipologie. Per esempio il pilastro in angolo.<\/p>\n

\"\"<\/p>\n

 <\/p>\n

 <\/p>\n

Capire cosa sono i ponti termici e identificarli \u00e8 solo il primo passo.<\/p>\n

Per risolverli, o per mitigarne gli effetti, \u00e8 importante progettare in modo integrato l\u2019edificio, coordinandosi con le diverse figure coinvolte, per individuare le soluzioni migliori.<\/p>\n

Tipicamente gli angoli, gli attacchi a terra, gli sbalzi, ecc. sono i punti maggiormente critici.<\/p>\n

Dalla maggiore dispersione di calore che si verifica in questi punti\u00a0ne consegue una minore temperatura superficiale<\/strong>.<\/p>\n

Temperature superficiali basse e umidit\u00e0 interna alta sono i fattori che, una volta combinati, possono portare alla formazione delle muffe.\u00a0Ad incentivare il fenomeno delle muffe spesso una ventilazione scarsa, perch\u00e9 l\u2019utente magari \u00e8 solito ad aprire poco o per nulla le finestre<\/span><\/strong>.<\/p>\n


\n

Alcuni accorgimenti per risolvere, o mitigare, i ponti termici.<\/strong><\/h2>\n

L\u2019unica soluzione per eliminare l\u2019impatto e le possibili conseguenze dei ponti termici \u00e8 isolare il fabbricato.<\/p>\n

In questo modo aumenter\u00e0 la resistenza termica, si ridurr\u00e0 la dispersione del calore e le temperature interne in queste zone saranno fuori dalla \u201czona di pericolo\u201d formazione muffa.<\/p>\n

Attenzione per\u00f2: anche un edificio isolato correttamente necessita di una corretta ventilazione dei locali, in modo manuale o meccanico, per smaltire l\u2019umidit\u00e0.<\/strong><\/p>\n

Diverse sono le tecniche di isolamento, principalmente possiamo isolare dall\u2019esterno o dall\u2019interno.<\/p>\n

Isolamento a cappotto esterno<\/span><\/strong>. Utilizzato sia per le nuove costruzioni sia per le ristrutturazioni. Nel primo caso sar\u00e0 pi\u00f9 facile eliminare i ponti termici grazie a possibili soluzioni tecniche sviluppate da aziende e costruttori e consolidate negli, si pensi per esempio ai disgiuntori strutturali degli aggetti.<\/p>\n

Nelle ristrutturazioni \u00e8 pi\u00f9 complesso risolverli, in alcuni si pu\u00f2 arrivare ad una sola mitigazione.<\/p>\n

In questo caso si pu\u00f2 pensare di abbinare al cappotto esterno degli interventi interni, come risolvi di isolante ad \u201celle\u201d eseguiti con materiali igroscopici.<\/strong><\/p>\n

\"\"<\/p>\n

Mitigazione del ponte termico con un isolamento interno ad “elle” nel punto critico. Esternamente \u00e8 stato realizzato un cappotto, la criticit\u00e0 della zona era determinata dalla presenza di una soletta a sbalzo di un balcone.\u00a0<\/em><\/p>\n

 <\/p>\n

 <\/p>\n

Isolamento dall\u2019interno<\/span><\/strong>. Utilizzato molto spesso per le ristrutturazioni o in abbinata ad isolamenti dall\u2019esterno.<\/p>\n

Spostare l\u2019isolante all\u2019interno comporta una pi\u00f9 accurata valutazione del comportamento igrometrico della stratigrafia e delle operativit\u00e0 di can<\/strong>tiere<\/strong>.<\/p>\n

Isolando dall\u2019interno la porzione di muro prima dell\u2019isolante rimane fredda perch\u00e9 il calore viene trattenuto dall\u2019isolante. \u00c8 facile in queste condizioni la formazione di condensa interstiziale.<\/p>\n

In questi casi si pu\u00f2 optare per l\u2019utilizzo di materiali igroscopici oppure di stratigrafie che prevedono l\u2019installazione di una barriera a vapore sul lato caldo dell\u2019isolate.<\/p>\n

Attenzione per\u00f2 agli impianti!!<\/strong><\/p>\n

Quando si isola dall\u2019interno i ponti termici \u00e8 possibile risolverli o mitigarli ricorrendo al principio della sovrapposizione.<\/p>\n

\"\"<\/p>\n

Isolamento dall’interno con schiuma minerale. A soffitto \u00e8 stato risvoltato l’isolante per 1 metro circa per mitigare il ponte termico. (principio della sovrapposizione)<\/em><\/p>\n

 <\/p>\n

 <\/p>\n

Utilizzato molto spesso per le ristrutturazioni o in abbinata ad isolamenti dall\u2019esterno.<\/p>\n

Altra strada possibile \u00e8\u00a0l’isolamento\u00a0in intercapedine\u00a0<\/span><\/strong>\u00a0<\/strong>\u00a0che prevede l\u2019insuflagio di materiale isolante in questo un\u2019intercapedine di aria, tipicamente presente in alcune partizioni esterne di edifici datati.<\/p>\n

In questo caso da\u00a0valutare attentamente la presenza di eventuali interruzioni dell\u2019isolante dovute alla presenza di elementi strutturali interni al paramento murario<\/strong>.<\/p>\n

Riassumendo, i fattori principali che portano allo sviluppo di muffa quindi sono:<\/p>\n

    \n
  • l\u2019isolamento termico insufficiente,<\/li>\n
  • la presenza di un\u2019eccessiva umidit\u00e0<\/li>\n
  • una scarsa ventilazione dell\u2019ambiente.<\/li>\n<\/ul>\n

    In ultimo, in caso di punti critici o per una maggior tutela, pu\u00f2 essere interessante valutare l\u2019utilizzo di pitture antibatteriche e antibiotiche. Studiate appositamente con una composizione chimica che ostacola la formazione di alcune tipologie di muffe.<\/p>\n

     <\/p>\n


    \n

    Da Domande a Sapere<\/h3>\n

    La nuova rubrica che trascrive e risponde alle\u00a0domande di tuoi colleghi professionisti e costruttori.<\/p>\n

    Domande che possono essere anche le tue!<\/strong><\/p>\n

    Scrivici e mandaci tuoi dubbi o particolari su cui vorresti confrontarti!<\/p>\n","protected":false},"excerpt":{"rendered":"

    Prosegue la nuova rubrica\u00a0“da Domande a Sapere”. Serie di articoli pensati per raccogliere e rispondere alle domande che abbiamo ricevuto da tuoi colleghi, professionisti e costruttori, che incontriamo nei corsi e convegni. In questo articolo parleremo di: In particolare approfondiremo interrogativi come: \u2013 Cosa sono i ponti termici? \u2013 Perch\u00e9 le muffe si formano negli […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-3489","post","type-post","status-publish","format-standard","hentry","category-senza-categoria"],"_links":{"self":[{"href":"https:\/\/cqwp.demoaddsolution.it\/verona\/wp-json\/wp\/v2\/posts\/3489","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cqwp.demoaddsolution.it\/verona\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cqwp.demoaddsolution.it\/verona\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cqwp.demoaddsolution.it\/verona\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cqwp.demoaddsolution.it\/verona\/wp-json\/wp\/v2\/comments?post=3489"}],"version-history":[{"count":10,"href":"https:\/\/cqwp.demoaddsolution.it\/verona\/wp-json\/wp\/v2\/posts\/3489\/revisions"}],"predecessor-version":[{"id":3506,"href":"https:\/\/cqwp.demoaddsolution.it\/verona\/wp-json\/wp\/v2\/posts\/3489\/revisions\/3506"}],"wp:attachment":[{"href":"https:\/\/cqwp.demoaddsolution.it\/verona\/wp-json\/wp\/v2\/media?parent=3489"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cqwp.demoaddsolution.it\/verona\/wp-json\/wp\/v2\/categories?post=3489"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cqwp.demoaddsolution.it\/verona\/wp-json\/wp\/v2\/tags?post=3489"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}