Installing a modified bitumen roof

If you have a flat roof or a low-sloped one, then you will need to have a modified bitumen roof. The bitumen sheets are made from asphalt based materials. This material is very resistant to cold.

The bitumen can be adjusted for different seasons, making it elastic at high temperatures. It’s advisable to install a moisture membrane on the roof before applying the bitumen material.

Here are the materials needed:

  • Tape measure
  • Propane torch
  • Hook blade (check if your utility knife has this feature)
  • Spark ignitor
  • Hammer
  • Chalk line
  • Ladder
  • Bucket
  • Water
  • Soap
  • Brush
  • Roofing felt
  • Cap nails
  • Drip-end flashings
  • Primer
  • Protective clothing


First of all you will need to clean the roof. Scrub the dirt off the roof with soapy water and a brush. Check if the texture of the roof is smooth, otherwise you will need help fixing that. You should do this 30 days before you start assembling the bitumen roof.

You should talk to a local contractor if you are not certain about some things.

Roofing felt

After you have cleaned the roof, install the roofing felt. Use cap nails to do this. They will need to be nailed at a distance of 6 to 8 inches.


Use a primer to prepare the roof. You will need one for sealing the concrete roof. Now get a sheet of bitumen and roll it out. Allow it to extend beyond the perimeter of the roof. Cut the sheets, but at a larger size than the roof.

Heat and bitumen sheets

Roll the roofing materials and then turn on the propane torch. If you are a beginner, then you should call someone with some experience to help you. After switching the torch on, wait until its flame turns blue. Use the flame to heat up the rolled roofing. Use your foot to more the roofing material until it reaches the edge.

applying bitumen on your roof, bitumen, bitumen roofing, cleaning the roof, flat bitumen roof, flat modified bitumen roof, flat roof, flat roof bitumen sheets, flat roof coating, modified bitumen roof, preparing the roof for applying bitumen sheets, priming the roof, roofing, roofing felt, using a propane torch to apply bitumen sheets