Sometimes we see roofs that have two layers of shingles. Not completely a huge deal other than tearing off two layers of shingles will raise a new roof price, but having four or maybe even more layers is just plain crazy. Some building codes do not allow more than one layer of shingles and some allow up to two, contact your local building code office for requirements in your area. When you put extra protection for the underlayment like doing 30# felt instead of 15#, there is really no need for another layer. There are many reasons why it is not a good idea to keep adding layers.
Often buyers and sellers are negotiating price, especially when it comes to repairs that need tending to. Whether you are the buyer or seller you need to ensure the roof is intact and in good condition. Sometimes the buyer will offer to repair or replace the roof and sometimes its up to the seller to do. So what should you do and look for as a buyer or seller?
Trying to choose a contractor can be exhausting sometimes. There is so much you have consider like licensing and insurance. When you contact a roofing contractor to get an estimate, there are some costs that are included or should be included when the contractor does his estimate. You should ask questions to see if you are getting what you paid for.