What Is Torch-Down Waterproofing for Parapet Walls?

Torch-Down Material

• The term “torch-down” refers to any material that you apply with a torch. Usually known as torch-down membranes, this material comes in a roll. As you unroll a torch-down membrane across a surface, you use a torch to adhere the material to that surface. Torch-down membranes usually contain asphalt and other ingredients, like minerals and copper. The heat from the torch causes the asphalt to soften – as it hardens, it forms a durable and incredibly strong bond with a surface.

Benefits of Torch-Down Material

• Torch-down membranes most commonly appear on flat surfaces that receive a high degree of rainfall or moisture. This material provides excellent waterproofing – so much so that it can withstand standing water in areas like flat, poorly drained roofs. Because of this, torch-down membranes often show up in flat roof systems and on decks, balconies and other areas with high exposure, underneath tiles or other flooring material. According to the book “The Complete Guide to Building Affordable Earth-Sheltered Homes,” torch-down material is relatively inexpensive and widely available.

Parapet Wall Torch-Down Waterproofing

• Parapet walls, often know simply as parapets, consist of small walls that extend from the top of a roof. These walls almost invariable exist on flat-roofed buildings and basically work to provide a barrier around the edge of a flat roof. Torch-down waterproofing on parapet walls constitutes any torch-down material used to create a waterproof layer on a parapet wall. On flat roofs with torch-down waterproofing, builders may extend the waterproofing up the side of a parapet wall to provide protection at the juncture where the roof and wall meet.

Installation

• You can install torch-down waterproofing on parapet walls yourself, or hire a professional installer. You should avoid doing a job like this yourself unless you have previous experience -- doing the job wrong can cause more problems than not doing it at all. If you install your own torch-down waterproofing, make sure you use the right type of torch with the material. When you purchase torch-down material, get information on the type of torch and temperature range it works best with and stick to this. If you worry about the cost of professional installation, you can get quotes from multiple companies to find the best deal.