Torch down roofing is a torch-applied asphalt membrane used for flat and low-slope roofs. Pricing for a roll depends on membrane type, thickness, and size, along with labor, preparation, and regional factors. This guide breaks down typical costs, roll sizes, and the variables that influence total project price, helping homeowners and contractors estimate expenses accurately.
What Is Torch Down Roofing
Torch down roofing, also called torch-down membrane, is a bitumen roofing system applied with a propane torch. It creates a seamless, waterproof layer suitable for flat or low-slope roofs. Common variants include APP (atactic polypropylene) and SBS (styrene-butadiene-styrene) modified bitumen, with surfaces that may be smooth, granulated, or coated for UV resistance. The membrane usually comes in wide rolls, typically around 3 feet (36 inches) wide, allowing rapid coverage when properly installed.
Material Types And Roll Sizes
Roll sizes commonly come in 36-inch widths, with lengths ranging from 75 to 100 feet, yielding coverage of about 225 to 450 square feet per roll depending on exact dimensions. The material thickness is described in mils or by the asphalt reinforcement; common thicknesse ranges are 45 to 60 mils, with SBS and APP variants offering different performance characteristics. The choice between smooth, granulated, or reflective surfaces can affect installation complexity and long-term durability.
Cost Factors To Consider
- Material Type—APP and SBS membranes vary in price and performance, with SBS generally offering greater flexibility and wind uplift resistance.
- Thickness And Surface—Thicker membranes and granulated surfaces cost more but can improve longevity and UV protection.
- Roll Size And Coverage—A standard 36-inch by 100-foot roll covers about 300 square feet; shorter rolls reduce waste but may require more joints.
- Roof Condition—Existing insulation, deck integrity, and drainage influence preparation time and material waste.
- Labor Rates—Regional wage differences, crew experience, and permit requirements affect total installed price.
- Ventilation, Flashing, And Detailing—Corners, penetrations, and flashing details add complexity and cost.
Typical Price Ranges
Prices vary widely by region and supplier, but ballpark ranges help in budgeting. Material costs for torch-down membranes generally fall in the following ranges per roll, before labor:
- Standard APP or SBS membrane: approximately $80 to $180 per roll, depending on thickness and surface finish.
- Higher-end or specialty membranes (e.g., reflective or premium granulated surfaces): roughly $150 to $250 per roll.
Installed price often reflects both material and labor, and typical ranges are as follows:
- Low-to-mid-range installed cost: about $3.00 to $5.50 per square foot.
- Mid-range installed cost: about $5.50 to $8.50 per square foot.
- High-end installations (thicker membranes, complex detailing): $8.50 per square foot and above.
To convert, one standard roll (36 inches by 100 feet) covers about 300 square feet. If a roof is 1,000 square feet, roughly 4 rolls would be needed, with additional rolls for waste and overlaps, pushing the project closer to 4.5 to 5 rolls in many cases.
What Affects The Installed Price
- Roof Size And Shape—Complex shapes, multiple levels, or extensive detailing increase labor and waste.
- Deck Condition—Cracks, rot, or damp insulation require prep work that adds cost.
- Flashing And Penetrations—Vent pipes, skylights, and edging require careful torch-down detailing.
- Weather And Timing—Extreme heat or cold and wet conditions can slow work and raise costs.
- Safety And Permits—Compliance with local codes and safety protocols influences total expense.
Tips For Accurate Budgeting
- Get multiple written quotes that itemize materials, labor, and disposal.
- Ask about roll waste and whether the contractor includes overlaps and flashings in the price.
- Request a breakdown by square foot as well as by roll to compare efficiency.
- Check for warranties on both membrane and workmanship, including duration and coverage specifics.