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- Johansson, Sanne, et al.
(författare)
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Biologisk påväxt på mineraliska fasader
- 2005
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Ingår i: Bygg & teknik. - 0281-658X. ; :8, s. 12-14
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- I maj 2004 påbörjades ett nytt projekt vid Lunds Tekniska Högskola som handlar om biologisk påväxt på mineraliska fasader. Projektet finansieras av FORMAS. Bakgrunden till projektet var att flera fall av nybyggda putsade fasader fick kraftig påväxt inom bara några år efter putsningen. Flera pilotförsök blev genomförda för att undersöka problemet i detalj och en sammanfattning av dessa redovisades i Bygg & Teknik 8/2002. Syftet med det nya projektet är att undersöka ovanstående problem genom att kombinera byggnadsteknisk kunskap med biologisk kunskap om de organismer vi finner på fasader.
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- Johansson, Sanne, et al.
(författare)
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Biologisk påväxt på putsade fasader
- 2007
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Ingår i: Bygg & teknik. - 0281-658X. ; :8, s. 42-43
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Vid Byggnadsmaterial LTH studerar vi biologisk påväxt på putsade fasader. Förutom mögel och bakterier som inte gör fotosyntes, så är samtliga andra organismer som växer på fasader fotosyntetiskt aktiva: alger, lavar och mossor. Vårt huvudintresse ligger i att beskriva samspelet mellan klimatet (främst temperatur och fukt) på fasaden, typ av fasad (isolering, putstjocklek, ytskikt, färgtyp etc.) och den biologiska aktiviteten.
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- Johansson, Sanne, et al.
(författare)
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Estimation of mould growth levels on rendered facades based on surface RH and surface temperature measurements
- 2010
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Ingår i: Building and Environment. - : Elsevier BV. - 1873-684X .- 0360-1323. ; 45, s. 1153-1160
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Tidskriftsartikel (refereegranskat)abstract
- Many façades made with thin rendering on thermal insulation have problems with biological growth. In this study surface temperature and surface RH were monitored over a 20 month period on test house façades with different constructions (thermal inertia), surface color and compass directions. This data were used to test three theoretical indices of biological growth with the aim of indicating the potential of mould growth on different types of rendered façades. The result show that thin renderings on thermal insulation have significantly higher surface humidities compared to façade constructions with higher thermal inertia and therefore have a higher potential for mould growth. The color is the most important factor for the surface humidity levels on south facing façades (on the northern hemisphere) as darker surfaces absorb more solar radiation and therefore have a higher average temperature. On a north facing façade the heat storage capability of the façade and its effect on the surface temperature is most import
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- Johansson, Sanne, et al.
(författare)
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Why do we often get biological growth on thin rendering on thermal insulation constructions?
- 2008
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Ingår i: Proceedings of the 8th Symposium on Building Physics in the Nordic Contries. - 9788778772657 ; 2, s. 919-926
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Konferensbidrag (refereegranskat)abstract
- If one takes a closer look at almost any building facade one will find biological growth. Although this can be seen as an integral part of an antique building, for modern buildings it is in most cases seen as an aesthetical problem. All building facades will most likely be discolored by biological growth by time, but in Sweden we have had many cases of newly built rendered facades that have been discolored much more rapidly than usual. The problem is believed to occur mainly on thin rendering applied on thermal insulation -which is a common building facade construction in Sweden -but apart from this, it is difficult to find clear indications of which facades that will be affected. As it is well known that different biological organisms has different requirements in physical factors (especially temperature and relative humidity) for germination and growth on any substrate, it is important to define which conditions the organisms needs to grow on a building fasade. We have studied the temperature and relative humidity conditions on the surfaces of different rendered facade constructions. We find that the surface temperature on a facade of thin rendering on thermal insulation drops quickly during nights, as these constructions have low heat capacity in the rendering layer. This leads to high relative humidity and even condensation, during clear nights. Other abiotic factors that seem also to influence the risk for growth are surface color and rendering structure. From the temperature and relative humidity measurements in this study, we aim at giving insight of the surface climate on a building façade in order to fully understand the rendered façade as a biological habitat.
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