Emitterande byggnadsmaterial: En nulägesanalys av metoder för att minska emissioner från fuktpåverkat, kaseinhaltigt flytspackel
Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Most building materials produce more or less emissions. The concentrations decrease with time if the surface of the material is ventilated. Therefore are emissions from building materials rarely a problem outdoor. On the contrary can people sometimes get health problems like cough, headache or eye and throat irritation when staying indoors, especially in older buildings.Many new building materials which hadn’t been tried before were used in the 60s and 70s. Those unknown materials were widely used under the Million Programme in Sweden when the focus was on building quickly and efficiently and not on using safe and tested materials. An example of an untried material that was introduced in Sweden in 1977 is a self-leveling screed containing casein. In 1983 the use of that screed was prohibited because of the bad smell, the health concerns and the discoloration on the oak-parquet it was causing when it came into contact with the alkaline moisture in the concrete construction.Issues with screed containing casein exists even today in some buildings like hospitals, schools and residents and it is therefore interesting to study. There doesn’t seem to exist any regulations for how to solve the problem and neither any follow-up methods. That means that the survey of suitable methods is mostly based on experience from previous measures. So mainly people working with indoor environmental issues have that knowledge.The purpose of the report is to gather and analyze information on how screed with casein is handled within the industry today by interviewing experts. 14 people have been interviewed: 9 experts and 5 suppliers. The answers from the experts have been used to answer the research questions of the report and the answers from the suppliers for a study case of an apartment. In the study case a time and cost analysis is made on different floor products which are used to solve problems with emission.Thanks to the interviews can interesting implications be drawn. There are three common methods that are being used today: mechanically ventilated floor, removing of the screed and concrete and emission barriers. The use of a mechanically ventilated floor is recommended by the experts who describe it as a safe measurement that can be trusted. The method has existed a long time and is recommended even in books and literature from the 80s and 90s. To remove the screed is not strongly recommended anymore. In the books it seems to be an effective method but according to the experts today it is an expensive, noisy and not so safe method. New products have been developed the last years which have a great potential and are worth to be tested. Those products are functioning as barriers that are applied on the concrete and prevent the emissions from reaching the indoor air. According to the time and costs analysis the costs vary a lot depending on which measure you choose. The most expensive method is the mechanical ventilated floor because of the high material costs and the assembly work that takes a bit longer time. The second most expensive method is the removing of the screed and the concrete and the cheapest are the different emission barriers. The last method is also the quickest.
Place, publisher, year, edition, pages
2015. , 97 p.
Teknik, Byggnadsmaterial, emissioner, flytspackel, kasein, sjuka hus, alkalisk fukt, betongbjälklag, åtgärdsmetoder, avjämningsmassa
IdentifiersURN: urn:nbn:se:ltu:diva-57769Local ID: e659e816-f78a-4d1a-a4c6-d49d598fe768OAI: oai:DiVA.org:ltu-57769DiVA: diva2:1031157
Subject / course
Student thesis, at least 30 credits
Architectural Engineering, master's level
Validerat; 20150417 (global_studentproject_submitter)2016-10-042016-10-04Bibliographically approved