The waterproofing element of most other roof expansion joints is a looped membrane.
Roof movement joints.
Nystrom s roof bellows system is an effective flexible joint closure for a wide variety of standard and special applications.
The curbs should extend at least 8 or 10 if a cant is used above the adjacent roof.
Joint sizes range from 1 to 2.
It is ideal for applications where exterior seals are used in walls and watertight transitions are critical.
When properly designed and applied expansion joints will allow for movement in three destinations.
The eej cover is 60 mil thick reinforced epdm bellows widely used in roof to roof and roof to wall cant applications.
This aluminum roof cover is comprised of extruded aluminum components injection molded turn bar duroflex gaskets and a polyethylene vapor barrier.
Expansion joints in roofs require wood curbs around each roof area.
Perpendicular and parallel to the joint in the horizontal roof plane and perpendicular to the roof in the vertical plane.
The roof system movement at the gable ends of the roof plane can accomplished by one of two methods.
In general the top surface of the curbs should be sloped away from the joint to shed condensation and moisture onto the roof.