A climatic study indicates that Swedish attics should be ventilated. Klimatstudie ger besked:stodbensvind bor ventileras.

The `Swedish Attic' has the ceiling to the upper floor self-supporting with a rafter roof supported by posts which rest on the upper ceiling. The system is commonly used in one and a half storey houses in which the upper floor is restricted to the area enclosed by the posts.< This study has been performed at the Royal College of Technology in Stockholm using a climate-simulator. It shows that the attic must be ventilated with continuous slots at the eaves and along the ridge.