A blue-painted steel mezzanine provides space for additional bedrooms beneath the original timber roof of this narrow terraced house in Vallès, Spain, which was modernised by Vallribera Arquitectes. More
A black box built from oriented strand board houses the kitchen and bathrooms of this converted barn home in Portugal, and also integrates a staircase leading to the mezzanine floor above (+ slideshow). More
Oriented strand board panels can slide back and forth to create a flexible floor plan whilst concealing utilities in this family apartment remodelled for a single inhabitant in Madrid by TallerDE2 Architects (+ movie). More
A national park in the Netherlands is the setting for this old water tower, which Dutch firm Zecc Architecten has transformed into an observation point by twisting staircases through its middle (+ slideshow). More
A combined bookshelf and staircase creates a small library with interchangeable shelving at this apartment in the Ukraine by architect Alex Bykov (+ slideshow). More
Dezeen archive: yesterday we featured a music school covered in oriented strand board (OSB) with furniture to match, so here are lots more projects from the Dezeen archives that use the same rough, timber-strand material.