Second Layer Of Roof Shingles

In fact the extra layer can reduce your roof s lifespan by up to 40.

Second layer of roof shingles.

This 1 2 tab has to be cut off where it hangs off the left edge of the gable roof. Flashing around roof penetrations and sidewalls can be compromised. Roofing second layer of shingles roofing. Attach with nails along the top edge of the strip.

Rip cut the starter strip or starter pieces so that they butt up against the second course of existing shingles and are even with the front edge of the existing roofing. Use a starter strip or cut pieces for a starter course. You could be adding weight to your roof with a second layer that your house cannot handle. The additional layers trap extra heat which causes damage to the roof.

How to shingle over existing shingles and how to shingle a roof how to install roof shingles shingle layout lines h. Plus depending upon the size of your roof you ve added multiple tons of weight which could pose a big problem if there is significant snow accumulation. Another issue is that when you add in the second layer it can add extra weight to your roof. Set the first shingle of the second row back a half tab 6 inches 17 centimeters from the edge of first shingle on the first row and so that the bottom of its tabs just touches the tops of the cutout slots on the shingle below.

The second layer of shingles will trap heat which can result in the decomposition of both roof layers. Add a layer of shingles over the newly repaired area before you install your second layer of shingles. This is especially true if there is huge snowfall. Shingles laid over an existing roof do not last as long as their typical lifespan.

Lay the second row of shingles. Water travels between the layers often coming through another spot meaning patch jobs and even identifying the source of the leak is difficult at best. That second layer of shingles won t last as long. Advantages of reroofing most building codes allow two layers of organic or fiberglass asphalt shingles on roofs with a 4 12 pitch or less and three layers on steeper roofs.

This will force you to replace your roof earlier than expected. That in itself eats away at the savings. The second layer is also more difficult to install properly compared to new shingles.