Because the trusses of the center were not properly reinforced when they were constructed, the entire roof structure almost collapsed during the reroofing. Granted, keeping costs down are important for churches. And volunteer labor is one way to save money on roofing. Some types of roofing, such as a three-tab shingle or clay tile may be installed by a volunteer crew that's supervised by an experienced roofer. However, it may be best to leave most roofing jobs to professional installers because of safety issues.
Metal sheets are awkward and slippery.
Roof heights and slopes require specialized experience and equipment. And some roofing tasks, such as joint preparation and flashing detail, are especially critical to create watertight barriers. Roofing is a dangerous and highly skilled profession. Click here for reprint information on Your Church.