How Torch-Down Roofing Works with Different Roof Materials in South Florida

Torch-down roofing is a waterproof roofing system that uses a heat torch to bond modified bitumen membranes to a roof surface. It is commonly installed on flat or low-slope roofs and works best over compatible substrates like concrete, insulation boards, and certain roofing base sheets. In South Florida, torch-down systems are widely used for commercial buildings, flat residential roofs, and roof additions because of their strong waterproofing performance.

Torch-down roofing is a modified bitumen roofing system applied by heating the underside of the membrane with a roofing torch. As the material melts, it bonds tightly to the roof surface, creating a seamless waterproof barrier.

This system is commonly used on:

Because South Florida experiences heavy rain, humidity, and hurricane conditions, torch-down roofing is popular due to its durability and water resistance.

The installation process typically includes several layers that work together to protect the roof.

The existing roof surface must be cleaned, dried, and prepared before installation. Contractors may remove old roofing material or install a base sheet depending on the structure.

A base sheet is installed to create a stable foundation for the modified bitumen membrane.

Roofing professionals use a propane torch to heat the underside of the membrane.