Here are 7 common questions and answers in the category radon & moisture damage for the Swedish construction industry. Every answer is anchored in primary law (PBL, BBR, KTjL, AFS, ABS 18, AB 04) and authoritative guidance. The data is open and free to use with attribution.
The reference level for radon in dwellings and public premises is 200 Bq/m³ as an annual mean per the Swedish Radiation Safety Authority and the Public Health Agency's general advice FoHMFS 2014:16. Newly built houses must, per BBR 6:23, have radon levels below this value.
Sources: BBR 6:23 · FoHMFS 2014:16 · Strålsäkerhetsmyndigheten
Radon is measured with track-film detectors placed in at least two rooms for at least 60 days during the heating season (1 October–30 April). Measurement must be accredited per the Swedish Radiation Safety Authority's methodology. Zaragoza AB recommends accredited measurement companies.
Sources: Strålsäkerhetsmyndigheten · Boverket
Common measures are a radon suction under the slab, sealing of floors and pipe penetrations, increased ventilation, and — for soil radon — installing a radon well. With blue concrete, ventilation helps most. Any measure must be followed up with a new measurement to verify its effect.
Sources: Boverket · Strålsäkerhetsmyndigheten
BBR 6:52 states that buildings must be designed so moisture does not cause damage or inconvenience. Critical moisture condition is the highest moisture level a material can tolerate without risk of mould or decay. For wood, the guideline is normally 75% relative humidity.
Sources: BBR 6:52 · Boverket
The bostadsrätt holder is responsible for interior maintenance including surfaces and floors, while the association is responsible for risers, facade, roof and load-bearing structures. For moisture damage in bathrooms, the cause is assessed — a riser fault falls on the association, a waterproofing failure on the member per the Tenant-Ownership Act and the statutes.
Sources: Bostadsrättslagen 7 kap. 12 §
Symptoms include a musty smell, discolouration, stains and allergy problems among occupants. Moisture measurement with a capacitive meter or drilled holes is used to confirm. If suspected, engage a certified moisture inspector. Zaragoza AB performs moisture investigations per SBR methodology.
Sources: Boverket · SBR byggingenjörerna
Säker Vatten (Safe Water) is an industry standard that reduces the risk of water damage and legionella. The installation must be performed by a certified plumbing company per Säker Vatteninstallation 2021:1. Pipes must be routed so leaks can be detected and diverted to a floor drain or leak indicator.
Sources: Säker Vatteninstallation 2021:1 · BBR 6:62