The invention is a roof, floor and wall rigid foam insulating and supporting manufactured form that is placed on and between a rafter, joist, or on wall stud support members. Raised support ridges on either side of the rigid foam form are placed on the rafter, joist or stud, and has recessed sections that lie between the support ridges. Overlapping sections on the support ridges allow for uneven spaced support members. The rigid foam form has the flexural strength to hold concrete, cementous or other protective composition material applied upon the surface of the rigid foam form. Roof or floor sheathing or covering can be placed upon the ridge line and fastened into the rafter or joist. Alternatively, spacer studs, that give height adjustment and a solid placement surface, can be placed into the support ridge spacer stud slots before sheathing or covering is placed.