{"id":8018,"date":"2022-07-07T10:56:07","date_gmt":"2022-07-07T08:56:07","guid":{"rendered":"https:\/\/era.archi\/window-frame-in-a-positive-house\/"},"modified":"2023-03-03T07:35:33","modified_gmt":"2023-03-03T06:35:33","slug":"marc-de-finestres-en-una-casa-positiva","status":"publish","type":"post","link":"https:\/\/era.archi\/ca\/marc-de-finestres-en-una-casa-positiva\/","title":{"rendered":"Marc de finestres en una casa positiva"},"content":{"rendered":"

\u00bfPer qu\u00e8 \u00e9s important el marc de la finestra en una casa positiva?<\/span><\/p>\n

Els 2 fonaments dels marcs de finestra a una casa positiva<\/span>.<\/p>\n

\n

Si encara no ens coneixem, fem una introducci\u00f3 r\u00e0pida: som ERA arquitectes<\/span>.
\nEn realitat, soy Esther Rovira, arquitecta i dissenyadora de cases passives a Barcelona, \u200b\u200bCatalunya i Andorra tant per a cases pasives, cases eficients i cases positives<\/span>.
\nEn aquest post ‘Marc de finestres en una casa positiva’<\/em>, trobareu la nostra recomanaci\u00f3 professiona<\/span>l.
\n\u00a1Espero que et sirva d’ajuda<\/span>!<\/p>\n

Los marcs de las ventanas de una casa positiva tienen que conseguir dos cosas: estanqueidad a l’aire, aislamiento y evitar puentes t\u00e9rmicos<\/span>.
\nLa primera dep\u00e8n de diferents agents. Les altres dos estan estrictament lligades al material del marc<\/span>.
\nVeamos com se aconsegueixn les dues coses<\/span>:<\/p>\n

 <\/p>\n<\/div>\n

1) Com aconseguir l’estanquitat dels marcs<\/strong><\/p>\n

L’hermeticitat dels marcs dep\u00e8n del seu correcte disseny arquitect\u00f2nic detallat i de la seva instal\u00b7laci\u00f3<\/span>.
\nPer tant, en primer lloc, \u00e9s obligaci\u00f3 de l’arquitecte<\/span>.
\nL’arquitecte dissenya el detall constructiu situant l’armaz\u00f3n al pla de planta i especificant on va la l\u00ednia cont\u00ednua d’estanqueitat a l’aire (el que s’anomena comprovaci\u00f3 amb llapis vermell)<\/span>.<\/p>\n

A continuaci\u00f3, especifica quin material s’utilitzar\u00e0 per aconseguir l’estanqueitat a l’aire des de l’exterior i des de l’interior<\/span>.
\nEspecialment a les connexions, com marcs-parets, i tamb\u00e9 marcs-s\u00f2l i, si \u00e9s necessari, marcs-sostre<\/span>.
\nAix\u00f2 se sol aconseguir amb productes especials que es dilaten amb els canvis de temperatura<\/span>.
\nV\u00e9nen en diferents formats, b\u00e0sicament en cinta o escumes expansibles. (Tingueu en compte que els escumes probablement tindr\u00e0 una base de pol\u00edmer)<\/span>.<\/p>\n

Una an\u00e8cdota r\u00e0pida:
\n<\/strong>A la majoria de les construccions de baixa qualitat, la causa principal de la p\u00e8rdua de confort s\u00f3n les finestres de baixa qualitat instal\u00b7lades. Tinc un amic arquitecte que sempre m’explica com recorda estar estudiant el nen davant de la taula de la finestra amb molts papers a sobre. Pot captar perfectament la imatge dels seus papers sent lleugerament movits per la corrent d’aire que entrava per la finestra en un dia de vent, per la qual cosa havia de col\u00b7locar el seu estoig de llapis sobre els papers per aconseguir una mica de concentraci\u00f3. Segur que tamb\u00e9 et posar\u00e0s una bufanda!<\/span><\/p>\n

 <\/p>\n

2) Com aconseguir marcs a\u00efllants i evitar ponts t\u00e8rmics<\/strong><\/p>\n

El que tamb\u00e9 significa que, depenent dels materials de l’estructura, acabar\u00e0 tenint un material naturalment a\u00efllant o un pont t\u00e8rmic amb el fred hivernal exterior (consulteu el nostre post \u00bfQue es un pont t\u00e8rmic?<\/a><\/em><\/strong><\/span> Per obtenir informaci\u00f3 m\u00e9s detallada).<\/span><\/p>\n

Aleshores repassarem els diferents materials que hi ha al mercat per cases passives per veure com es comporten<\/span>.
\n(Tingues en compte que es tracta d’una llista de l’oferta del mercat. La majoria no estan fets de materials naturals. Si nom\u00e9s vols materials naturals, llavors reconeixer\u00e0s la fusta en aquesta llista)<\/span>.<\/p>\n

Alumini
\n<\/strong>Tot i que existeix una gran varietat de finestres d’alumini amb trencament de pont t\u00e8rmic certificades per l’institut Passive House; personalment aquesta opci\u00f3 no em conven\u00e7 (per ara<\/span>).
\nL’alumini \u00e9s un material amb alta transmit\u00e0ncia t\u00e8rmica (aix\u00f2 significa que transmet molt la temperatura de l’exterior a l’interior i viceversa)<\/span>.
\nPer a les fusteries d’alumini s’acomplisquen amb els nivells d’a\u00efllament que necessiten una casa passiva, aquestes fusteries tenen m\u00faltiples c\u00e0meres a\u00efllants amb escumes a\u00efllants afegides<\/span>.
\nAix\u00f2 augmenta les dimensions de la fusteria fins a un m\u00ednim de 110-119 mm<\/span>.<\/p>\n

Fibra de vidre
\n<\/strong>Aquest material t\u00e9 molt poc \u00fas<\/span>.
\nLa ra\u00f3 per la qual est\u00e0 en aquesta llista \u00e9s perqu\u00e8 hi ha fabricants que han certificat marcs d’aquest material<\/span>.
\nAix\u00ed, aquest material \u00e9s t\u00e8rmicament millor que l’alumini, per\u00f2 ni tan sols s’acosta al rendiment t\u00e8rmic del PVC. Aquest material \u00e9s gaireb\u00e9 deu vegades m\u00e9s resistent que el PVC i molt m\u00e9s estable (amb menys dilataci\u00f3 i contracci\u00f3 amb els canvis de temperatura)<\/span>.
\nSolen ser amples (105 mm al carril inferior) i tenen una durabilitat molt alta<\/span>.
\nNom\u00e9s hi ha 8 fabricants d’aquest tipus de fusteria al m\u00f3n i 6 es troben a la Xina<\/span>.
\n(Nota: Mai he sentit a parlar de ning\u00fa que utilitzi aquest material per als marcs a Espanya)<\/span>.<\/p>\n

PVC
\n<\/strong>En aquests moments, el material amb millor rendiment t\u00e8rmic i relaci\u00f3 qualitat-preu s\u00f3n les finestres de PVC<\/span>.
\nEn altres paraules, \u00e9s la teva opci\u00f3 m\u00e9s econ\u00f2mica i a\u00efllant t\u00e8rmicament<\/span>.
\nTot i aix\u00ed, has de saber que s\u00f3n una mica lletges, amb marcs massissos que no permeten grans obertures (101mm al travesser inferior)<\/span>.
\nTamb\u00e9 \u00e9s important destacar que el PVC \u00e9s Policlorur de Vinil i que, com tots els pol\u00edmers, la seva base \u00e9s el petroli (normalment m\u00e9s del 40%!)<\/span>.<\/p>\n

Fusta
\n<\/strong>\u00c9s l’opci\u00f3 m\u00e9s consistent perqu\u00e8 la fusta \u00e9s naturalment a\u00efllant<\/span>.
\nTot i que solen tenir m\u00e9s gruix (117-121mm al batent inferior), avui dia es poden trobar models de fusteria m\u00ednima (98mm al batent inferior)<\/span>.
\nEls dos \u00fanics inconvenients s\u00f3n: el preu i el manteniment<\/span>.
\nPodeu evitar el manteniment amb fusteries mixtes de fusta amb una pe\u00e7a d’alumini a l’exterior. Per descomptat, s\u00f3n les m\u00e9s cares de totes<\/span>.
\n(Nota: Al districte de l’Eixample de la ciutat de Barcelona, \u200b\u200best\u00e0s obligat a utilitzar fusta als teus marcs. Fins i tot de vegades a utilitzar un determinat tipus de color. Aix\u00f2 \u00e9s per protegir el paisatge urb\u00e0 d’aquest barri centenari)<\/span>.<\/p>\n

 <\/p>\n

 <\/p>\n

La nostra recomanaci\u00f3 professional:<\/strong>
\nDemana al teu arquitecte que faciliti el valor U dels marcs de les finestres<\/span>.
\nAix\u00ed podr\u00e0s saber si sap dissenyar una casa positiva o no<\/span>.<\/p>\n

Tamb\u00e9 pots estar interessat en:
\n<\/strong>En el nostre post: ‘Envidrament en una casa positiva’<\/a><\/strong><\/em><\/span><\/p>\n

 <\/p>\n

Espero que aquesta publicaci\u00f3 \u2018Marc de finestres en una casa positiva\u2019<\/em> sigui \u00fatil!<\/p>\n

Molta sort en aquesta aventura.
\nEns veiem a la propera publicaci\u00f3,<\/p>\n

\n

\"architectBarcelona\"<\/p>\n

Esther Rovira Raurell<\/a><\/span><\/strong><\/div>\n
\n
Arquitecta col.legiada a Barcelona<\/a>\u00a0#44234-8<\/div>\n
Passive House Designer<\/a><\/div>\n
Afiliada a la\u00a0International Passive House Association<\/a><\/div>\n
Fundadora d\u2019ERA architects<\/a><\/div>\n
<\/div>\n

P.S. Vols rebre consells sostenibles GRATIS?\u00a0S\u00ed, vull!<\/span><\/a>\u00a0<\/strong>o segueix-nos a\u00a0Instagram<\/a>,\u00a0Pinterest<\/a>,\u00a0Twitter<\/a>\u00a0y\u00a0Facebook<\/a><\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

\u00bfPer qu\u00e8 \u00e9s important el marc de la finestra en […]<\/p>\n","protected":false},"author":1,"featured_media":7758,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[599],"tags":[636,637,638,639,640,641,642,644],"class_list":["post-8018","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-arquitecte-casa-pasiva","tag-architect-barcelona-ca","tag-architect-passive-house-barcelona-ca","tag-clt-house-ca","tag-english-speaking-architect-barcelona-ca","tag-passive-house-en-ca","tag-passive-house-barcelona-ca","tag-positive-house-ca","tag-wood-house-ca"],"yoast_head":"\nMarc de finestres en una casa positiva - ERA architects<\/title>\n<meta name=\"description\" content=\"A 'el marc d'una finestra en una casa positiva' t'explico quins materials funcionen millor per als marcs de les teves finestres\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/era.archi\/ca\/marc-de-finestres-en-una-casa-positiva\/\" \/>\n<meta property=\"og:locale\" content=\"ca_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Marc de finestres en una casa positiva - 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