What is the minimum requirement for slab thickness? Comments Off on What is the minimum requirement for slab thickness? 18 Jan 2016 Vote Up 0 Vote Down Answered Public Public Private Underfloor Heating Anonymous asked January 18, 2016 Hi, what is the minimum requirement for slab thickness? 1 answer Vote Up 0 Vote Down Public ⋅ January 19, 2016 If in mesh the minimum thickness required is 100mm with 25mm minimum required above pipes, 30mm being optimal, #1 Please login or Register to Submit Answer