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<br /> <br />DETAILS OF HOT WEDGE WELDING SYSTEM <br />I. FiVIL Preparation <br />A. Note that this document assumes that the proper FVIL has been brought to <br />its exact plan position for final installation and seaming. <br />B. The nvo FVILs to be joined must be properly positioned such that <br />approximately three inches of overlap exists. <br />C. It the overlap is sufficient, lift the FML up to air beneath it and "float" it <br />into proper position. Avoid dragging FML sheets, particulazly when they <br />are on rough soil subgrades since scratches in the material can create <br />various stress points of different depths and orientations. <br />D. There can be no excessive undulations (waves) along the seams during the <br />seaming operation due to problems in slack adjustment. When this occurs, <br />with the upper sheet having more slack than the lower one, it often leads to <br />the undesirable formation of "fishmouths" which must be trimmed, laid <br />flat, and reseamed via a patch. <br />E. There generally will be excessive slack in the FMLs depending on the <br />ambient temperature, length of time the Fiv1L will be exposed, ect. <br />F. The sheets which are overlapping for seaming must be clean. <br />G. The sheets which aze overlapped for seaming must be completely free of <br />moisture in the azea of the seam. Air blowers aze usually preferred over <br />rags because sufficient dry rags are usually not available to keep the FML <br />dry enough to be suitable for seaming. <br />H. No seaming is allowed during rain or snow, unless the seam is covered <br />with an enclosure. <br />The soil surface beneath the FMLs cannot be saturated because the heat of <br />seaming will draw the water into the region to be joined. Ponded water on <br />the soil's surface beneath the FML is never allowed. <br />The soil beneath the FMLs cannot be frozen, for the heat of seaming will <br />thaw the frost allowing water to be drawn into the region to be joined. <br />The seaming, however, can be accomplished with rub sheets directly under <br />seam edges. <br />4l <br />