Evan Field

We use british standard BS 5975 code of practice for temporary works as it contains a much more comprehensive list of friction co-efficients

For typical conventional slab formwork, you would allow for an additional 25% to the centre leg of a triple frame setup with a 2 span bearer (eg. located under slab beams) to account for the increased internal support load due to a 2 span beam. Typically under flat slabs, you would design bearers based on a min 3 span bearer which results in an additional 10% to the 1st internal support.