Alignable foam board

A single shaped insulating foam board for attachment to building studs having a vertical cross section, a horizontal cross section, a substantially flat front surface, a substantially flat back surface, and four flat edges extending from the front surface to the back surface, wherein

• the back surface forming a drainage panel, said drainage panel comprising a multitude of drainage areas, each drainage area being formed by vertical drainage ridges and drainage grooves, and each drainage area being separated from each other by an inner stud ridge, said vertical ridges and grooves running from an upper end of the back surface to a lower end of the back surface, wherein at least one inner stud ridge coincides with a building stud, and
• the substantially flat front surface comprising markings for attachments on the building studs, said markings coinciding with those inner stud ridges on the back surface that coincide with the building studs, and said markings being separated from each other by clearance ridges and wherein a height of the drainage ridges when measured as a distance from a bottom of a drainage groove to a top of an adjacent drainage ridge is smaller than a height of the inner stud ridges when measured as a distance from a bottom of a drainage groove to the top of an adjacent inner stud ridge.