Duct tape and string help to align the saddle caps. The pieces of the ridge cap or hip cap (shown here) are bedded in silicone and fastened with two nails each into the wood strips the author attaches to all hips and ridges. To keep the caps straight, he sights along a string that runs from the eaves to the peak. Strips of duct tape hold the two pieces of the caps together while the silicone dries. Back to Roofing With Slate