Second Layer Of Roof Shingles

You could be adding weight to your roof with a second layer that your house cannot handle.

Second layer of roof shingles. Use a starter strip or cut pieces for a starter course. If the structure can support the added weight a typical 20 square 2 000 square foot reroof will cost at least 1 000 less than a tear off job. 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. How to shingle over existing shingles and how to shingle a roof how to install roof shingles shingle layout lines h.

This 1 2 tab has to be cut off where it hangs off the left edge of the gable roof. Another issue is that when you add in the second layer it can add extra weight to your roof. This step is important because it brings the underlying surface back to a level height consistent with the rest of the roof plane. Flashing around roof penetrations and sidewalls can be compromised.

This will force you to replace your roof earlier than expected. 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. Shingles laid over an existing roof do not last as long as their typical lifespan. That second layer of shingles won t last as long.

That in itself eats away at the savings. In fact the extra layer can reduce your roof s lifespan by up to 40. Add a layer of shingles over the newly repaired area before you install your second layer of shingles. The second layer of shingles will trap heat which can result in the decomposition of both roof layers.

Roofing second layer of shingles roofing. 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. That helps your final layer of shingles look flat with a proper installation. 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.

Attach with nails along the top edge of the strip. Lay the second row of shingles. The additional layers trap extra heat which causes damage to the roof.