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A roof expansion joint, RoofJoint is a patented dual-seal, double-flanged, extruded thermoplastic rubber system for sealing expansion joints in roofs, plaza assemblies, green and vegetative roofs. 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.
The waterproofing element of most other bellows roof expansion joints is a looped membrane. The loop either hangs down into the joint or is humped up by means of a foam backing. Either way, looped bellows membranes don’t work well at the transition from the roof joint to wall joints and suffer from having only one layer of sealing.
Unique to RoofJoint is the double-level flange. This flange allows multi-layered, watertight integration with the roofing membrane. The lower flange is welded or adhered to the roof membrane alongside the joint opening. Termination bar and anchors mechanically lock the flange to the roof decking or blocking. The upper flange counterflashes the termination bar and underlying membrane ensuring that penetrations made by the attachment of the termination bar are completely sealed. The upper flange is further flashed to the roofing membrane by means of the roofing manufacturers’ standard flashing tape or by over-welding a strip of roofing.
Movement at the joint is accommodated by the folding design of the gland. The double-cell configuration provides two levels of sealing. The geometric shape is purpose-designed for the lowest strain during movement to ensure longevity.
In addition to flat roof applications, RoofJoint can be effectively used for softscape plazas, green or garden roofs, and blue roofs. RoofJoint can be used in split-slab and hardscaped decks when drainage or other construction may be impeded by the expansion joint protruding above the structural deck elevation. In these cases an additional expansion joint seal would be needed at the wearing course. (See SJS, DSM and DSM-DS.) As with roof applications where a fire-rated seal is also required, Emshield DFR can be installed directly below the RoofJoint.
Most importantly, wherever RoofJoint is used, you can transition from roof to wall using Sika Emseal’s unique RoofJoint Closure to marry RoofJoint to Seismic Colorseal in the vertical wall expansion joints.
Available in TPV (reflective white) and NPVC (reflective white or black), RoofJoint is compatible with most roofing membranes, features two levels of joint sealing, two levels of membrane integration, and two methods of fastening (bonded and mechanical).
RoofJoint and RoofJoint Closures provide the first purpose-designed transition from roof expansion joints to wall expansion joints. US Patent: 9,739,050
In this mock-up, Seismic Colorseal comes up the wall, is connected to the underside of RoofJoint with a factory-fabricated Seismic Colorseal RoofJoint Closure. The reflective-white RoofJoint features a factory-welded, reinforced, leak-tested outside 90 downturn that marries to the RoofJoint Closure. On the roof deck, the RoofJoint features a deck-to-wall flashing sheet on the vertical plane surface that has been welded into a vertical “boot” to receive the intersecting Seismic Colorseal in the adjacent wall.
Fully welded into the TPO roof membrane RoofJoint ensures watertightness across the joint while preserving the reflective membrane design intent across the entire roof.
Continuity of seal in changes in direction and at terminations is achieved with factory-fabricated direction changes that are field-welded to straight runs.
We ship to you in the longest lengths possible and with field-measured, factory-fabricated transitions already attached. This maximizes productivity while minimizing leak risk.
Factory-fabricated downturn termination installed over edge of roof.
Lower mounting flange welded to roof membrane with hot air gun.
Lower mounting flange secured with termination bar and screws.
Upper mounting flange welded to roof membrane to encapsulate and protect termination bar and anchors and to add second level of roof membrane integration.
Roof Expansion Joint Termination over roof edge RoofJoint from EMSEAL
EMSEAL RoofJoint roof expansion joint factory fabricated transition dry-fit to field condition.
EMSEAL RoofJoint roof expansion joint factory fabricated curb transition dry-fit and butt-welded to straight runs.
RoofJoint lower mounting flange embedded into roof membrane mastic.
RoofJoint lower flange secured to deck with termination bar and concrete anchors.
The roof expansion joint to wall expansion is properly addressed with RoofJoint and a RoofJoint Wall Closure. The interface can be concealed with appropriately detailed flashing.
Solid-Wall RoofJoint Closure provides a transition from the underside of RoofJoint to Seismic Colorseal to seal the wall to roof interface in solid wall construction.
Cavity-Wall RoofJoint Closure provides a transition from the underside of RoofJoint to Seismic Colorseal to seal the wall to roof interface in cavity-wall wall construction. The silicone-coated side panels bridge the cavity.
With factory-fabricated downturn transitions married to a RoofJoint Wall Closure, the roof to wall expansion joint interface is properly sealed.
Roof expansion joint details produced from field measurements guide the work of Sika EMSEAL's weld team. For this project, RoofJoint was factory welded to transition at a 3-way intersection of a roof scupper, a flat parapet roof, and a corner roof parapet. A factory 90 downturn is also incorporated to transition to the exterior wall and sealed with a Seismic Colorseal closure piece.
RoofJoint factory welded and installed to account for the 3 different conditions all intersecting each other. At the end of the roof, a factory-fabricated RoofJoint closure creates a seamless and watertight transition down the exterior wall to Seismic Colorseal.
A waterproof roof to wall expansion joint transition into an exterior wall where the roof turns down the wall, and transitions back to a roof. Continuity of seal is ensured by incorporating factory-welded transitions at both locations. A RoofJoint closure is utilized at the 90 downturn to the wall, and a "boot" termination at the bottom of the wall keeps this joint watertight in both locations. Seismic Colorseal is married into each of these pre-welded pieces to bridge both roofs.
A roof to wall expansion joint cover transition with Seismic Colorseal and RoofJoint closure piece at a 90 downturn. Notice a roof scupper detail needed to be accounted for in the factory-welded RoofJoint flanges to wrap the corners of this transition.
Roof to wall expansion joint transition - RoofJoint runs along top of a flat parapet, then hits a wall at a corner and jogs horizontally alongside the wall. The transitions continue and wrap the corner of the wall, and then downturn to Seismic Colorseal at the vertical exterior façade. A Seismic Colorseal closure piece is incorporated at the downturn to ensure continuity of seal. All of these transitions, of course, being factory-welded by our weld team.
Roof expansion joints are adjoined by a vertical wall and all tied together with factory-fabricated transitions. At the top, RoofJoint downturns to Seismic Colorseal with a factory-welded RoofJoint Closure piece. Seismic Colorseal then continues down the metal panel façade and transitions under the soffit with a Universal 90 Transition , then back down the wall where it terminates into a RoofJoint "boot". With all of these dissimilar materials and changes in direction, continuity of seal is maintained to ensure watertight, trouble-free expansion joints.
(Click to Enlarge) RoofJoint expansion joint detail with tie-in to Sika Sarnafil roofing system membrane.
(Click to Enlarge) Expansion joint detail with tie-in to Hydrotech MM6125 hot-rubberized-asphalt waterproofing membrane.
Factory welded RoofJoint RJ-0800 8-inch roofing system shown on Sika Emseal's shop floor. This custom welded watertight transition is designed to ensure a sealed building envelope from a white PVC roofing membrane to a black exterior vertical wall joint with Seismic Colorseal.
The RoofJoint RJ-0800 factory welded and leak checked underside. This further displays the intricate welds to ensure a watertight transition to the wall joint.
Zoomed in view of the underside of the RoofJoint RJ-0800 factory welded reinforcing straps.
RoofJoint RJ-0800 vertical transition on the shop floor and ready to ship to the job site.
Double-level roof-membrane integration flanges
Redundant fastening—adhesion or welding & termination bar
Factory heat welded transitions at tees, crosses, roof-to-wall, etc.
RoofJoint is available in two formulations: Nitrile-Rubber-Plasticized NPVC alloy or TPV (Thermoplastic Vulcanizate).
Nitrile-Rubber-Plasticized NPVC Used for: – direct welding to PVC-based roof membranes; – adhesion into hot or cold-applied rubberized asphalt systems; – adhesion to thermoset-rubber roof membranes (EPDM, Neoprene, etc.) – adhesion to SBS membranes – adhesion into torch-applied mod-bit membranes
The PVC version of RoofJoint is extruded from a Nitrile-Rubber-Plasticized PVC alloy. A Nitrile-Rubber-Plasticized NPVC blend was chosen for this product for its broad compatibility with most roofing systems.
It can be heat-welded to PVC roofs, and subject to the recommended procedures of the particular roofing membrane manufacture in respect to preparation, cleaning, priming, etc., adheres well to the accessories of all adhered (sheet-goods), asphaltic (hot or cold applied), and SBS modified systems.
TPV (Thermoplastic Vulcanizate) Used for direct integration through welding to TPO (Thermoplastic Olefin) based roof membranes.
RoofJoint includes necessary termination bar and fasteners required for installation.
Continuity of Seal
As with all EMSEAL expansion joint systems, continuity of seal is extended to crosses, tees, upturns, downturns, roof-to-wall, and other compound conditions typically found in construction projects.
Factory-fabricated transition pieces can be welded to straight lengths in our plant wherever field measurements are provided and can be butt-welded to straight lengths in the field using simple equipment and training available from EMSEAL. All welds are strengthened with reinforcing strips and leak-checked before shipment.
The silicone-coated top side of the closure is shaped to match the underside of the RoofJoint extrusion. The Solid-Wall RoofJoint Closure is installed before installing the RoofJoint. It is installed ¾” down from the roof deck or wood blocking surface. A sealant band of silicone is applied across the upper mating surface of the closure. The RoofJoint is then installed. The underside of the RoofJoint will mate with the top of the already installed closure.
Cavity-Wall RoofJoint Closure Like the solid-wall closure, the cavity-wall RoofJoint closure, is a factory-fabricated transition piece made from Seismic Colorseal. The difference is an extended, horizontal setback portion of coated foam to bridge the cavity from facade to structural backup wall. The sides of the “bridge” are additionally coated with silicone to seal them against moisture in the cavity and to constrain the lateral expansion of the foam into the cavity.
The underside of the RoofJoint marries to the top of the appropriate RoofJoint Closure. Seismic Colorseal in the wall joint is joined to the RoofJoint Closure. This creates a watertight continuity of seal from the structure’s vertical plane (wall) through the horizontal plane (roof).
RoofJoint is ideally suited for use in sealing the structural slabs beneath green, vegetative roof assemblies. Because the growing medium is loose, compressible and granular, movement that occurs at the structural slab can be absorbed without detrimental effect in the green roof overburden. The groove in the extrusion act as a reservoir for excess growing medium moisture while not prohibiting drainage across the joint when needed.
RoofJoint is ideal for roof, soft-scape plazas, vegetative roof and green roof expansion joint applications.
RoofJoint is also an excellent option for split-slab and hardscaped decks when drainage or other construction may be impeded by the expansion joint protruding above the structural deck elevation. In these cases, an additional expansion joint seal would be needed at the wearing course. See SJS, DSM and DSM-DS.
When the expansion joint requires a fire rating, DFR can be installed directly below the RoofJoint for a single source solution.
For split-slab, podium and other hardscaped decks without drainage or other imitations, see the FP (For Plaza) series of expansion joints from EMSEAL: Migutan FP Series, DSM-FP Series, SJS-FP series or SJS-FP-FR Fire Rated Series offers both with a single product.
Insulation in the joint opening beneath a roof expansion joint is critical in maintaining energy efficiency in the structure. Insulation under RoofJoint can be achieved in two ways:
The advantage of this solution is that in addition to insulating, the Horizontal Colorseal provides an additional watertight barrier beneath RoofJoint that ties into the RoofJoint Wall Closure transition piece and further ensures continuity of seal and insulation with the wall joint. The R-Value of Horizontal Colorseal is 2.15 per inch of depth. Therefore in a 4-inch joint, Horizontal Colorseal has a depth of 4.5 inches and an R-Value of 9.675. To increase the R-Value of any size of Horizontal Colorseal, specify an increased custom depth.
Insulation Method 2: Batt Insulation and Looped Membrane (by Others)
By installing a looped membrane of standard roofing material (by others) to support fiberglass or mineral wool insulation batts before installing EMSEAL’s RoofJoint. While commonly done, this solution provides no continuity of R-value with the wall expansion joint and is subject to insulation value loss through moisture retention due to condensation accumulation in the batt insulation as well as through compression during joint cycling.
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