26 September 2006
c. Staging of new materials when existing materials are being torn off;
d. Providing for material removal when dust management is used;
e. Removing surface dirt and loose aggregate on aggregate-surfaced
roofs prior to tear-off;
f. Providing protection of building interior and protection of exterior
g. Providing interior dust control; and
h. Evaluating potential impact of new work on deck underside
System and Site Safety Considerations.
Safety is of paramount importance. Protect occupants from fumes by
coordinating the shut down of air handling units. Protect occupants in areas
where roofing work is taking place directly overhead by directly cordoning off the
area, especially if deck repairs are taking place. Protect all occupants entering or
leaving the building from falling materials. Identify the location of underground
tanks and other sensitive, sub-surface items so that heavy vehicles do not
overload these areas.
If deck replacement is necessary, the operations directly beneath the deck being
replaced will require shut down for safety and leakage reasons. Additionally,
since it may be impossible to maintain HVAC services, humidity control, and air
exchange with the building roof being open, a more extensive shutdown may be
LIFE CYCLE COST CONSIDERATIONS.
It is unlikely that a re-cover will last as long as a total tear-off and replacement.
Since the military limits re-cover to one layer, eventually total roof replacement
must occur. Therefore, carefully weigh the life-cycle cost of re-cover versus
removal and replacement. The cost of replacement is greatly affected by ease of
access, the need for slope buildup, and the need to raise mechanical equipment
for access. Reroofing is an excellent time to remove obsolete equipment and
stacks from the roof.