What kind of roof shingles can you put on as a second layer?

Most building codes will allow you to put a second layer of organic or fiberglass asphalt shingles on your roof. Before starting such a project, it is important to have your roof inspected to make sure it is able to withstand the added weight and subsequent moisture retention of a second shingle layer. It is recommended that you arrange for a professional roofing specialist conduct this inspection. If you would prefer to assess the damage on your roof before calling a professional, you can find some helpful tips <a class="url" target="_blank" rel="nofollow noreferrer" href="/to/?target=http://www.centuryspouting.com/home-improvement/annual-roof-inspection/">here</a>.