Whenever you begin in a building project you must get a permit from your local government. This will require a building plan. After you have your building plan and have received a permit you are ready to begin building. In the past it was necessary to build trusses by hand, however today most are pre-made and can be special ordered at a lumberyard or building supply store. This is the cheapest and easiest route for a do-it-yourselfer.
Roofing is a dangerous job. Before you begin make sure you have safe tools that you are familiar with. Also be sure to read any safety warnings on your supplies. Always wear gloves and goggles to protect your body.
To begin installation, start with the end trusses. After these are installed you may move on to the side trusses. These will be difficult to lift and you will need to hire a crane. Next it is time to place the sheathing. On top of the sheathing you should place builder's felt this will help to protect your new roof. Depending on the type of roof you build you may need to install soffits. Your building plan should detail whether this is necessary or not.
If the roof you are installing is part of an addition you must follow all of these guidelines however there is an additional step. After installing the trusses but before installing the sheathing you must install valley jacks were the new roof and old roof join.
The final step to building your roof is adding shingles and/or other topical agents such as fire barrier coating or leak barrier coating. There are many kinds of shingles available. Durability and style are both important. You want your home to look nice, but you also want a product that is affordable and will last.
While building a roof on your own is difficult, the money you save can be well worth it. Just remember with this and any other building project you do make sure you have the proper permit.