All Hollowcore planks are designed to the requirements of BS 8110. Standard Hollowcore planks have a minimum fire resistance of 1 hour. Units are manufactured to the following nominal depths 150mm, 200mm, 250mm, 300mm, 400mm and 500mm. Hollowcore planks are ideal for use in upper floors, being lightweight and easy to install.

Longley Concrete will provide layout drawings for the Hollowcore plank details prior to manufacture. These drawings show the structure supporting the precast units, position of service entries etc., typical sections and the loads for which the floor is designed.

Quality is the prime concern of designers, developers, builders and ultimately homeowners. The robustness of a concrete floor adds to the quality of a house. Concrete floors act as a thermal store, this can reduce heating costs especially when under-floor heating systems are used.

This hollowcore span table is to be used for preliminary purposes only. Other factors may affect slab performance.

Maximum spans may improve with the addition of a structural screed.