Why Two Layered Shingles are Ineffective
Challenge
This existing roof had two layers of shingles stacked on top of one another. While some roofing companies may do this to save themselves and their customers time and money, it is not worth the investment. When you stack shingles on top of one another, it leads to moisture entrapment issues. Shingles are designed to be able to "breathe" and when you stack them, it destroys this purpose. This results in moisture soaked and soggy decking and attics. Two layers also causes heat entrapment, which can swelter the shingles and decking. It is also extremely difficult to keep the top layer of shingles from falling away, as the nails aren't capable of keeping them there.
Solution
We set out to replace this roof The Klaus Roofing Way, the right way. We started by demoing the existing roof, making sure to set up our tarps over the front and back porches of the home, as this was going to get messy with so many shingles. Once we got to the wet decking, we made sure to replace any sheaths that were not up to code. After making sure we have a strong and dry structure to work with, we then installed our underlayments. We prep the underlayments by sealing all seams of the decking with our waterproof tape. Then our first underlayment goes six feet up from all edges of the roof. It is called the KRS Sealoron Ice & Water Shield. This underlayment is an adhesive and is great at making sure water and ice stay away from under the shingles. Because of this, we place it where water is most likely to run rampant. The other underlayment is a felt synthetic and is called the KRS Velora One. This underlayment is super strong as well, and goes everywhere else over the decking. After the underlayments, we then were able to install IKO Dynasty shingles in the Cornerstone shade. We carefully install all shingles with galvanized nails, which prevents rust. Something neat to add is that when we nail shingles over the adhesive Ice & Water underlayment, the glue wraps around the nails, further preventing water intrusion. The result is a beautiful, breathable, strong new roof.
