Construction cores are cylindrical paper forms used in the building industry to concrete columns and supports, or to lighten monolithic structures such as bridge bodies, ceilings, dams, or to form designed cavities in such structures so as to house piping and cable distributions.

The cylindrical paper form comprises a spiral wound paper core, inside and outside coated for protection, whereby increased surface smoothness and water resistance are attained.

The paper form is produced with inner diameters from 200 to 600 mm and lengths from 500 to 6000 mm.