The so called “ByggaF-method” is a relatively new Swedish method to stop moisture from being built into a building. The method should prevent damages on buildings as a result of mould growth and moisture. The purpose of the method is to include moisture control in the entire construction process, from the projecting phase and all the way to the management phase. Up until now, there is no proof if the method is profitable or not and no studies have been made on the topic. Therefore the rationale of this study is to show if a part of the method is in fact profitable from a financial point of view. The study is based on a renovation project of a building from the 1960 s in the outskirts of Stockholm. The building went through a major renovation 2006 which was poorly executed and led to major indoor environment problems. The current property owner consequently wanted the new renovation to be executed in a highly secure way from a moisture control point of view. One part of the method is that there is a full time moisture safety inspector at the construction site who ensures that the moisture control plan, which has been established during the projecting phase, is followed. Any deviation from this plan is documented and a deviation report is made. The study is based on these deviation reports. The reports have been analysed and calculations have been carried out to estimate the cost of the potential damages that could have occurred if the deviations had not been detected. This has led to a figure on how profitable the method really is.

The purpose of this study is to investigate what is crucial for the use of weather protection and its effects when building with CLT (cross-laminated timber). The study was conducted through literature review, site visits, and interviews with representatives from various organizations, including weather protection suppliers, CLT producers, installers, and Skanska Sverige AB. These were chosen to highlight perceptions in the field and the effects of identified factors. The authors used a qualitative approach with semi-structured and written interviews. Effective moisture management in CLT constructions is necessary for the building's durability. Weather protection improves the working environment and productivity but requires careful planning for cost-effectiveness. The decision to use weather protection is influenced by cost, client requirements, and climate conditions. The future development of CLT focuses on making the material more efficient and finding standardized solutions. To decide on weather protection, factors such as moisture issues, working environment, time, cost, climate, project location and scope, and client requirements need to be considered. Collaboration is required to develop adaptable weather protection and more reliable methods to detect microbial growth. Quality and well-being should be prioritized as highly as cost, although cost will always be a significant part of the decision. By following up on reference projects, decisions can be based on facts and experience to achieve more sustainable construction projects.