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Document #800-0351-001 Rev B
Page 20
ZS COMP INSTALLATION MANUAL FOR COMPOSITION SHINGLE ROOFS - U.S.
4.4.3 Thermal Expansion Joints and Module Columns
When there is a continuous column of Interlocks all serving as a thermal expansion joint,
all
Interlocks must be tightened consistently going up the column
. In most cases, one side is
turned to Position 3, and the other side to Position 2, the exception being a staggered array. For
example, a North-South drop-in with thermal expansions that run East-West could be installed as
follows:
Figure 4.7 Thermal Expansion Joint: Interlock Tightening Positions, North-South Drop-In
Note that the Interlock Position 3 also locks in the Tongue side modules (up-roof side) as well.
4.4.4 Physical Gaps Between Sub-Arrays
Thermal Expansion Joints only work along the axis of the Interlock. Thermal expansions running
along the other axis (parallel to the module drop-in direction) require a physical break between the
sub-arrays. For example, a vertical North-South drop-in may require physical breaks between
rows.
At a minimum, the gap should be at least 4 inches or 100 mm. However, a gap of 12 inches or 300
mm is recommended for ease of servicing.
Ground Zep
Array Skirt
Interlock
Thermal Expansion
Joint
Ground Zep
Equipment
Grounding
Conductor (EGC)
Bond path
