In strip-head firing, a series of lines of fire are set progressively upwind of a firebreak in such a manner that no individual line of fire can develop to a high energy level before it reaches either a firebreak or another line of fire. A backing fire is generally used to secure the base line and the remainder of the area then treated with strip-heading fires. Strips are often set I to 3 chains apart. The distance between ignition lines is determined by the desired flame length. This distance can be varied within a fire to adjust for slight changes in topography, stand density, weather, or the type, amount or distribution of fuel. Compensation for minor wind direction changes can be made by altering the angle of . strip fire with the base line. Treat major changes in fuel type separately. An effective method of reducing fire intensity is to use a series of spots or short 1 to 2 foot-long strips instead of a solid line of fire. An added advantage of these short strips or spots is that drip torches will not have to be filled as often. Strip-heading fires permit quick ignition and burnout, and provide for smoke dispersal under optimum conditions. However, higher intensities will occur wherever lines of fire burn together, increasing the likelihood of crown scorch.
Occasionally, on areas with light and even fuel distribution, a heading fire may be allowed to move over the entire area without stripping to better accomplish the objective(s). This method reduces the number of areas of increased fire intensity that occur each time two fires burn together. Caution: Be sure the fire will not escape control. First set a backing fire along the downwind control line and allow it to burn out a strip wide enough to control the heading fire.
Factors Associated with Strip-heading Fires