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� <br /> Wrinkles may form 'rf the hot-air welding machine drags the membrane at an angle to the seam. Such � <br /> dragging can be caused by a machine that is out of alignment by the welding of seams along, up, or <br /> down too great a slope, or by the improper unrolling of the membrane, so that it does not lie flat and/or � <br /> parallel to the seam direction. <br /> Wrinkles and other distortions may also occur in hand welding operations because of inconsistent � <br /> hand-rolling and welder movement. The operator should strive for smooth, consistent progress. Use a <br /> low enough heat setting to permit smooth work, especially with non-reinforced sheet. <br /> Hand welding for field seams may be necessary on steep slopes, although some contractors fund that ;� <br /> the hot-air welder machine can be "held back" by the operator (possible with a helper) when welding <br /> DOWN slopes. This practice increases the difficulty of "staying on course," and is not recommended <br /> for the novice operator. � <br /> Repairing Punctures and Holes in Membranes <br /> Occasionally, punctures and holes may occur in the Mule-Hide Heat-Weld Membrane. Punctures and � <br /> holes are frequently the result of other trades working on the roof, which should be kept to a minimum <br /> by the building owner/manager or project general contractor. ;B" <br /> l� <br /> To repair punctures and holes in the Heat-Weld Membrane follow this procedure for hand welding a <br /> patch: � <br /> 1. Clean the surface to be patched. Clean an area a minimum of 4 inches in all directions around the <br /> puncture or hole thoroughly with Fantastik or other similar general cleaner. Rinse thoroughly. � <br /> Wipe with clean, damp rags and dry well. Surface must be cleaned until it is white. <br /> 2. Wipe the cleaned area of the field sheet membrane with Mule-Hide Membrane Cleaner, following (� <br /> all directions and precautions on the label. Final cleaning with the Mule-Hide Membrane Cleaner 4� <br /> will help ensure the removal of any remaining dirt or soap film. <br /> 3. Cut out patch. Cut a round or rectangular patch with rounded corners from field sheet membrane. � <br /> The patch must be 3 inches larger in all directions than the puncture or hole. <br /> NOTE: All patches must be cut from scrim-reinforced membrane. � <br /> 4. Position patch over the puncture or hole. Take care to allow for even laps on all sides. <br /> 5. Hot-air weld the patch. Using the hand-held hot-air welder and hand roller, hot-air weld the patch � <br /> over the puncture or hole. <br /> 6. Caulk the cut edges. Caulk all edges of the patch with Mule-Hide Edge Sealant. � <br /> Making a Temporary Tie-In � <br /> While the roofing job is underway, it is vital to keep insulation, roofing board, and/or other substrate and <br /> deck dry. Moisture that is present under the Mule-Hide Heat-Weld Membrane will have a difficult time � <br /> escaping once the membrane is hot-air welded. <br /> Therefore, a"night seal," or temporary waterstop, should be applied whenever storms threaten and at <br /> the end of every workday. The time needed to apply a night seal is well invested. The resulting �� <br /> protection can prevent the need for costly and time-consuming tear-off of wet substrate materials! <br /> IMPORTANT! The membrane used to make a night seal must be trimmed back prior to work. ;� <br /> Asphaltic products used to make a night seal are not compatible with Heat-Weld Membranes. <br /> �:�� <br /> II <br />