Expansion Joints and Pre-Compressed Sealants
roof-membrane integration flanges
fastening—adhesion or welding & termination bar
• Heat welded
transitions at tees, crosses, roof-to-wall, etc.
SEISMIC COLORSEAL wall joints
addresses wall joint to roof joint interface
version available for welding compatibility with PVC membranes, as well as
as for adhering into asphaltic, SBS, mod-bit, or thermoset rubber roof membranes
• White TPV
version available for direct welding into TPO reflective roof membranes
Black or Reflective White
TPV: Reflective White
and Movement Capability
1-2 inches (25-50mm)
1-2 inches (25-50mm)
*Note: Movement as a
percent of joint size is affected by the joint-size into which
the RoofJoint installed. In general it is safe to assume
that the RoofJoint is capable of 100% movement of
mean-temperature joint size. Consult EMSEAL for specific
EMSEAL RoofJoint, roof expansion joint, is a dual-seal, double-flanged, extruded thermoplastic
rubber system for sealing expansion joints in 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 elements of roof expansion joints currently are looped
membranes. The loops either hang down into the joint in the case of
metal-cover systems, or are humped up by means of a foam backing. Either
way, while they look good in cross-section, looped membranes don’t work well
at the transition from the roof joint to wall joints.
EMSEAL’s decades of experience lies in sealing parking and plaza deck joints
with systems that sit in the joint.
As with the products used for these other critical waterproofing
applications, an extruded joint profile that incorporates redundant levels
of sealing, low-strain compression and extension capability, and a broad
cross-section that can be welded to ensure continuity of seal in changes in
plane and direction, are the hallmarks of EMSEAL’s RoofJoint system.
Unique to EMSEAL’s RoofJoint is the double-level flange. This flange
configuration facilitates multi-layered, watertight integration with the
The lower flange is welded or adhered to the roof membrane brought up to the
joint. A termination bar and anchors mechanically locks 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 ensures redundancy in sealing.
The geometric shape is purpose-designed for the lowest strain during
movement to ensure longevity.
RoofJoint Composition - PVC or TPV
RoofJoint is available in two formulations:a Nitrile-Rubber-Plasticized NPVC alloy or TPV (Thermoplastic Vulcanizate).
- direct welding to PVC-based roof membranes;
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
A Nitrile-Rubber-Plasticized NPVC blend was chosen for this product for its
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.
At least 100% (+50%; -50%) of nominal joint size at mean temperature for
joints from 2 to 4 inches (50 - 100mm) wide.
(NOTE: Movement is affected by the joint size into which it is designed.)
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 or 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.
As seen in the two illustrations below,
the top of the appropriate RoofJoint Closure is married to the underside of
the RoofJoint and the bottom is joined to the wall's
SEISMIC COLORSEAL. 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.
Limitations--Not for Hardscape Plazas
RoofJoint is for use in roof decks only. It is not intended for use in
split-slab, podium, or plaza deck design.
This is because there is no inherent capability within RoofJoint to
separate--topping slab, pavers or other rigid wear course materials from one
another at the deck surface to properly accommodate movement in the wear
For split-slab, podium and plaza deck design 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. If designed for installation into the
structural slab of a split-slab or plaza deck design, EMSEAL takes no
responsibility for buckling pavers or cracking or binding in topping slabs that will occur
as movement from the structural slab is referred through the wear course.
Insulation in the joint opening beneath a roof expansion joint is critical
in maintaining energy efficiency in the structure. Insulation under EMSEAL’s
RoofJoint can be achieved in two ways:
(Specify and Install
HORIZONTAL COLORSEAL Beneath the RoofJoint)
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 SEISMIC COLORSEAL RoofJoint
transition piece and further ensures continuity of seal and insulation with the wall
The R-Value of HORIZONTAL COLORSEAL is 2.15 per inch of depth.
Therefore in 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
commonly done, this solution provides no continuity of R-value with the
wall expansion joint and is additionally subject to insulation value
loss through moisture retention due to condensation accumulation in the