Shingling Second Story Off A First Floor Roof

The goal is to create a level surface for the first course of new shingles.

Shingling second story off a first floor roof. Apply the starter shingle so that the top edge butts up against the bottom edge of the 2nd row of shingles and the bottom edge is flush with the edge of the roof. Apply this starter shingle along the entire length of the lowest edge of all roof planes. How to shingle over existing shingles and how to shingle a roof how to install roof shingles shingle layout lines h. The second layer of shingles will trap heat which can result in the decomposition of both roof layers.

Another issue is that when you add in the second layer it can add extra weight to your roof. After snow melts it drips down from the roof onto the deck and freezes making an icy deck. Chances are your roof structure was designed for a dead load of one layer of shingles plus extra for snow and a safety margin. Beveled wood pieces called horsefeathers must be laid along the thick edges of the shakes to make a fairly flat surface.

There is a doorway to the deck in the middle of the back of the house. The metal flashing is formed with a hook edge and cleated on 12 centers. I m looking for a maintenance free solution to the icy. In fact the extra layer can reduce your roof s lifespan by up to 40.

Lay the second row of shingles. The flashing needs to be installed before installing the roof shingles. I have a two story house in new england with basically a flat back but the second story overhanging the first story by 16. Good quality composite shingles can weigh 350 to 450 pounds per square 100 square feet of roofing installed.

Roofing second layer of shingles roofing. The flashing extends up the wall at least 4 the flashing extends onto the roof a minimum of 2 inches 4 inches is preferable in more severe climate areas. If you don t tear off the old layer you can t examine the decking. This 1 2 tab has to be cut off where it hangs off the left edge of the gable roof.

This will force you to replace your roof earlier than expected. Before you reshingle a roof read our step by step guide for adding new shingles over old ones.