Can You Put A New Roof Over An Old One?

Posted on: 30 July 2018

If the roof on your house is no longer protecting your house like it should be, it might be time to get a new roof. When you begin thinking about this, you might realize what a big job it is to replace a roof, and you might consider putting a new roof right over your old one. This is something that people do often, but it is not always the best idea. Here are several things to understand about covering a shingled roof with a new shingled roof.

Why People Choose This Method

The first thing to understand is that the most common reason people choose to put a shingled roof over the top of an existing roof is to avoid having to do the work of removing the old roof. Removing an old shingled roof is a huge job, and it will typically require scraping every last piece of the old roof off before putting the new roof on.

If you remove a roof, not only must you clean off every single piece of it, but you will also need to have a place to put the debris. This typically means that you must rent a dumpster, as this is the best way to dispose of an entire old roof. While there are times when placing a new roof over an old one will work, there are more times when it is better to remove the old roof first.

Times When You Can Put a New Roof Over an Old One

The main situation where placing a new roof over an old one would work is when the roof you currently have is still all in place and has no missing shingles. If the roof is in this condition, you might be able to go right over it without hurting anything. If you can do this, you will save money, because you will not have to pay to remove the old roof, and it will be easier and faster. The other benefit of doing it this way is that your roof might actually be better protected, as it will have two layers of shingles on it.

Times When You Should Not Do This

There are also a lot of situations where this is not a good idea. The first thing to find out is how many layers of shingles your house currently has. If it already has two layers, you cannot safely add another layer of shingles. Your house is not constructed to support the weight of three roofs, but most homes are built in a way that they can support two. If you have two layers already, you will need to rip them off before putting a new roof on.

Secondly, you will need to find out what condition the wood is in that is found under the shingles. If the roof has wood on it that is warped or rotten, these sheets will need to be replaced, and you cannot replace them without removing the existing roof. If you do not examine the wood and simply place a new roof over the old one, you could end up with major problems in the future. This is one of the top reasons why roofing companies generally suggest removing an old roof before putting a new one on.

If you would like to find out your options for replacing your old roof, you should contact a roofing company. A roofing company like Shamrock Roofing Services can fully inspect your roof to see what the best option would be, and they can also give you a quote for repairing or replacing the roof on your home. Contact a roofing contractor today to learn more.