Hello!
I live in a villa from the 1920s in Skåne (clay ground) with a 55 m2 basement with a ceiling height of 187 cm. The house was drained 20 years ago and is equipped with a Platon mat. We have decided to break up the existing concrete floor (3-4 cm) in the basement and dig out as much as the outer walls allow (maximum 30 cm). The purpose is to increase the ceiling height by 10-12 cm and reduce humidity to use the basement as a guest room with a toilet and bath.
I am now considering the choices we should make when laying the new insulation, with regard to reverse moisture migration. My aim is not to have to lay a thicker layer of insulation than necessary to get as much increase in ceiling height as possible. I would prefer to avoid macadam to avoid something that builds height without contributing to insulation. I'm considering between foam plastic and Isodrän. Foam plastic requires macadam but seems better in terms of reverse moisture migration. Isodrän is a poorer option regarding reverse moisture migration, but I can avoid macadam.
Which solution seems most sensible from the suggestions below? I am, of course, open to other solutions!
Option 1 Contractor's suggestion, cheapest and simplest, but risk of reverse moisture migration?
CONCRETE 6-8 cm with water-based underfloor heating
ISODRÄN 10 cm
GEOTEXTILE
CLAY GROUND
Option 2 My idea to reduce the risk of reverse moisture migration
CONCRETE 6-8 cm with water-based underfloor heating
ISODRÄN 5 cm (offset relative to the lower Isodrän boards)
VAPOR BARRIER/PLASTIC SHEETING
ISODRÄN 5 cm
GEOTEXTILE
CLAY GROUND
Option 3 My idea to further reduce the risk of reverse moisture migration
CONCRETE 6-8 cm with water-based underfloor heating
FOAM PLASTIC XPS300 5 cm
VAPOR BARRIER/PLASTIC SHEETING
ISODRÄN 5 cm
GEOTEXTILE
CLAY GROUND
Very grateful for any feedback!
Best regards, Pernilla
I live in a villa from the 1920s in Skåne (clay ground) with a 55 m2 basement with a ceiling height of 187 cm. The house was drained 20 years ago and is equipped with a Platon mat. We have decided to break up the existing concrete floor (3-4 cm) in the basement and dig out as much as the outer walls allow (maximum 30 cm). The purpose is to increase the ceiling height by 10-12 cm and reduce humidity to use the basement as a guest room with a toilet and bath.
I am now considering the choices we should make when laying the new insulation, with regard to reverse moisture migration. My aim is not to have to lay a thicker layer of insulation than necessary to get as much increase in ceiling height as possible. I would prefer to avoid macadam to avoid something that builds height without contributing to insulation. I'm considering between foam plastic and Isodrän. Foam plastic requires macadam but seems better in terms of reverse moisture migration. Isodrän is a poorer option regarding reverse moisture migration, but I can avoid macadam.
Which solution seems most sensible from the suggestions below? I am, of course, open to other solutions!
Option 1 Contractor's suggestion, cheapest and simplest, but risk of reverse moisture migration?
CONCRETE 6-8 cm with water-based underfloor heating
ISODRÄN 10 cm
GEOTEXTILE
CLAY GROUND
Option 2 My idea to reduce the risk of reverse moisture migration
CONCRETE 6-8 cm with water-based underfloor heating
ISODRÄN 5 cm (offset relative to the lower Isodrän boards)
VAPOR BARRIER/PLASTIC SHEETING
ISODRÄN 5 cm
GEOTEXTILE
CLAY GROUND
Option 3 My idea to further reduce the risk of reverse moisture migration
CONCRETE 6-8 cm with water-based underfloor heating
FOAM PLASTIC XPS300 5 cm
VAPOR BARRIER/PLASTIC SHEETING
ISODRÄN 5 cm
GEOTEXTILE
CLAY GROUND
Very grateful for any feedback!
Best regards, Pernilla