The Flat Roof Estimating Calculator is used to calculate the Labour, Materials and Plant costs associated with typical flat roofs. All of the items required for a flat roof are specified from the Specification.

The Flat Roof Estimating Calculator calculates the following items:

  • Roof joists and wall plates
  • Fascias and guttering
  • Roof waterproofing and perimeter flashings and drips
  • Guttering and down pipes
  • Plastering and insulation
  • Internal and external decorating
  • Plus all labour associated with the above


  • Flat roofs can be constructed in several different ways with insulation positioned at various levels and utilising a wide variety of insulation and water proofing systems. It is therefore essential that each of these items are carefully examined within the Specification and/or the Calculated Resources tab and adjusted to accommodate the methods you are using.