An existing roof can sometimes remain beneath a new assembly, but recover suitability must be established first. The archived project illustrates an approach used on one roof; it is not permission to cover wet insulation or damaged decking.

What to check first

  • Assess moisture and structural condition.
  • Check the number of existing roof layers and applicable requirements.
  • Review flashing heights and drainage before adding thickness.

Evaluate the complete roof assembly

  1. Inspect what is beneath the surface

    Wet insulation, damaged decking, unsuitable attachment, and trapped moisture can change the scope of work. A new top layer cannot restore deteriorated supporting components.

  2. Plan the transitions and drainage

    Coordinate edges, parapets, penetrations, drains, and overflow routes with the selected system. These connections are part of the roof, not finishing details to improvise later.

  3. Use a building-specific specification

    Follow the selected manufacturer’s assembly requirements and appropriate professional review. Torch application, structural changes, and concealed damage need qualified personnel rather than a general DIY recipe.

Watch the field examples

These archive demonstrations show individual projects. Use the current guidance above and Bergstrom’s published instructions if an older video shows a different product or method. Torch work shown in installation videos is professional work.

From the project archive

Flat-Roof-Installation
Historical project photo · Flat Roof Doctor
Preparing the surface for installing a new rubber roof. Use leave blower
Historical project photo · Flat Roof Doctor
Remove old a/c units prior to the Installation of a new roof
Historical project photo · Flat Roof Doctor

Product reference: Bergstrom Industries’ published knowledge catalog. Follow the latest product label and safety information. Historical project examples are educational and are not a specification for every roof.