Roof Movement Joints

It is ideal for applications where exterior seals are used in walls and watertight transitions are critical.

Roof movement joints.

The waterproofing element of most other roof expansion joints is a looped membrane. Watertightness is achieved through positive integration with the roofing membrane and a purpose designed system for transitioning between the joint in the roof and joints in walls. 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.

A roof expansion joint emseal roofjoint is a patented dual seal double flanged extruded thermoplastic rubber system for sealing expansion joints in roofs. This aluminum roof cover is comprised of extruded aluminum components injection molded turn bar duroflex gaskets and a polyethylene vapor barrier. In general the top surface of the curbs should be sloped away from the joint to shed condensation and moisture onto the roof. When properly designed and applied expansion joints will allow for movement in three destinations.

The gable trim can be fixed to the supporting structure and the roof float over it via clip attachment as shown in movement at gable a or the gable trim can be affixed to and float with the roof system an be attached to the wall via clips as shown in movement at gable b. 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.