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Exposed flat roof - Double layer

A system of Dr. Fixit Torchshield plain and mineral finish membrane is used for durable waterproofing for roofs.

  • Excellent ability to bridge cracks.
  • System life expectancy of 10 years.

Method Statement


• Clean the surface thoroughly to get rid of all contaminants. Remove all surface imperfections and repair with polymer modified mortar using Dr. Fixit Pidicrete URP.

• Prime the surface with Dr. Fixit Torchshield Primer. Allow it to dry for 8 to 10 hours.


• Start the application of Dr. Fixit Torchshield AP 4160 (plain finish APP based) from the outlet, going towards the centre of the roof area.

• Lay the second layer of Dr. Fixit Torchshield AM 4160 in a perpendicular direction to the first membrane, starting from 150 to 200 mm on the parapet wall. This is a mineral-finished APP based membrane of 4 mm thickness.

• Terminate with a flashing strip 20 cm above the slab.Finish the top edge of the membrane with aluminium flashing.

• Provide Dr. Fixit roofing accessories such as roof drains, flashing strips, etc. as per standard roofing practices.

Technical data Sheet

Dr. Fixit Torchshield APP membrane

Dr. Fixit Torchshield SBS membrane


 Q. What is a Polymer Bitumen Based waterproofing membrane?

A. Waterproofing membranes manufactured from bitumen modified with the addition of elastomers (SBS) or plastomers (APP) called Polymer Bitumen Waterproofing Membranes. They generally have fiberglass or polyester as reinforcement

Q. How long is the lifetime of bitumen based waterproofing membranes?

A. The bitumen based waterproofing membranes continuously maintain their performance throughout the useful lifetime of the building if they are selected, detailed, and installed properly. However, low quality bitumen based waterproofing membranes have shorter lifetime

Q. Where can I use bitumen based waterproofing membranes?

A. The bitumen based waterproofing membranes are used almost everywhere in buildings where there is water contact. Particularly the walls, foundations and ground floors contacting soil as well as foundation walls, balconies, terraces and pitched roofs where the water may accumulate or flood outside the building, and wet spaces such as bathroom, washing basin, WC are general fields of application of bitumen based waterproofing membranes.

Q. Are bitumen based waterproofing membranes resistant to sunlight?

A. The granule or aluminum foil surfaced bitumen based waterproofing membranes are resistant to UV rays. All other bitumen based waterproofing membranes are not affected by UV rays as long as they are topped with a protective layer (screed, concrete, concrete tiles, gravel etc.).

Q. Are the bitumen based waterproofing membranes applied only on concrete surfaces?

A. Generally, they are applied on concrete and wooden surfaces. It can also provide a perfect bond on other surfaces.