[header] How to install torch down roofing [title] Remove any old roofing, debris, or other objects from the surface that is to be roofed. [substeps] Removing old roofing is not always necessary; check with local building codes. Often, torch down roofing can be installed directly on top of old roofing. 
[title] Secure metal flashing to the edges of the roof area. [title] Apply primer to the metal flashing to allow the torch down roofing to adhere to it more easily.