Spantherm loading

Design Specification

Spantherm units are designed to BS EN 1992-1-1:2004 Eurocode 2 and BS EN 13224:2011 Precast Concrete Products – Ribbed Floor Elements.


Can be built off the floor providing these have been allowed for in the design. Generally 6kN/m blockwork walls run parallel to span (load shared between ribs of adjacent units). Walls that can be built off the floor will be indicated on layout drawings.


Domestic garages are designed to carry a distributed load of 2.5kN/m 2 or a concentrated load of 9.0kN. Finishes minimum: 50mm concrete screed with a minimum compressive strength of 25N/mm 2 reinforced with A142 steel mesh applied directly.


All service holes are formed during the manufacture of the slabs, our standard service notch is 200mm x 200mm. Please contact the Spantherm Technical Team if larger openings are required.

Building Regulations

Spantherm will provide insulation levels which comply with Part L of Building Regulations England and Wales; Part F, NI and Section 6 for Scotland. Each floor’s thermal performance needs to be assessed individually in accordance with EN ISO 6946:2007 and EN ISO 13370:2007 to comply with the 2010 edition of Part L of the Building Regulations.

Standard Dimensions

1200mm wide x 375mm deep; 900mm wide x 375mm deep; 400mm wide x 375mm deep; 600mm wide x 375mm deep. Grout - 30N concrete with an aggregate size of not more than 10mm.


Spantherm requires a bearing of 100mm on masonry. Slabs can be supported by the inner skin of the cavity walls to provide side bearing where this has been allowed for in the design.


Floor mass excluding infill to joints

Width (m) Floor Mass (Kg/m²) Floor Mass (Kg/m)
1.2 225 270
0.9 250 225
0.6 310 185
0.4 335 135