Just like most projects, roofing requires you to have a clean surface to work on. The sheathing also has to be perfectly flat, so if you see any warping, replace it. Lastly, every last nail has to be removed to ensure it doesn't affect the new roof once installed, causing problems.
When meeting with a professional roofer, ask to see a copy of their liability insurance. Any trustworthy roofer should have copies readily available. If they have a hard time providing you with their papers, they're probably not someone you want to work with. When you're trusting someone with your roof, you want all your bases covered.
Carefully check the written estimate that you are given by a professional roofer. Make sure to document when your project starts, the estimation of when it's to be completed, and what payments are made. Avoid paying in full up front. Make sure the warranty is clear and that you understand what voids it.
When inspecting your roof for leaks, it is important that you inspect the whole roof, not just one section. If you find a troublesome area of your roof, you should still check all areas, as there could be more problems elsewhere. It will be cheaper for you to have all fixes done at the same time, rather than waiting.
If your home needs a whole new roof, you may want to consider going with a green roof. Becoming more and more popular, green roofs allow for green growth, from materials like wildflowers and grass. Having these materials on your http://www.doityourself.com/scat/roofing/ roof saves you tons of money each year and is great for the environment.
Repairing or replacing your roof is not something that you can easily delay or just do by yourself. You need professional help to have it done right. This is why it is important to educate yourself about roofing before it is too late. Remember the information you have read here the next time you need work done on your roof.
