Random spacing method for 3Tab shingles
In the next paragraphes, you'll be more informated about spacing shingles.
For Superglass 3Tab shingles use galvanized 25 mm long roofing nails.
The nail position is shown here. >>>
Prepare the starter by cutting off the tabs from a Superglass 3Tab shingle.
Cut half a tab from the 1st starter and nail down to the drip edge. Starters must be overhanged about 1 cm over the drip edge and sealed with mastic.
Random spacing can be achieved by removing different amounts from the rake tab of succeeding courses compared to classic installation method where there is removed ½ a tab.
You have to follow these general rules:
1. The width of any rake tab should be at least ¼ a tab.
2. Cutout centerlines of any course should be located at least ¼ a tab laterally from the cutout centre line in both the course above and the course below.
3. The rake tab widths should not repeat closely enough to cause the eye to follow a cutout alignment.
