Specific building code requirements apply to roof system
re-cover and replacement projects. But because a large number of
reroofing and re-cover projects are undertaken without a licensed
design professional's involvement, it is important you know
building code requirements that apply to such projects.
IBC 2012's Section 1510.1—General indicates materials and
application methods used for re-covering or replacing existing roof
systems must comply with the same requirements as new roof systems
except reroofing projects need not comply with the code's minimum
1/4:12 slope requirement for roofs that provide positive drainage.
The code defines positive drainage as a condition in which
consideration has been made for all loading deflections of a roof
deck and additional slope has been provided to ensure roof drainage
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