Non-Invasive Anchoring

Non-invasive anchoring refers to the attachment of an expansion joint system to the joint faces or substrates to be sealed without the use of any fasteners that are required to be screwed into or embedded in the substrate.

Invasive anchoring on EMSEAL’s joint systems is eliminated in favor of the use of the mechanical backpressure of precompressed, foam combined with a pressure-sensitive adhesive impregnation and in some case a field application of a high-bond epoxy adhesive.  The result is that the substrates are not violated be they window mullions, bricks, masonry, historic materials, or even jumbotrons or other sensitive equipment.

non-invasive anchoring can prevent spalled substrates

Back of mounting rail of strip seal shows brick spalled by anchoring screw

Screws and expansion anchors are commonly used to fasten rails, plates, and other systems offered for expansion joint sealing and bridging.  By nature, screws are either self-tapping or require holes to be drilled and then the screws tapped into the holes.  On brittle substrates like concrete, masonry or brick, drilling often results in spalling of the substrates and improper grip.  Usually installed at an angle to the face of the joint substrate, the act of screwing is often imprecise resulting in further substrate damage, shearing of the fasteners and loose attachment of the joint system.

non invasively anchored precompressed sealants install properly at inside corners where strip seals cannot

In corner where adjacent wall prevents drilling and screwing, contractor must rely on adhesive instead of screws to hold strip seal in place.

At inside corner applications common in additions or building plane changes, it is impossible to position a drill or driver to install anchors in the substrate opposite the inside corner.  This often-overlooked condition results in the joint system being installed into an unreliable adhesive or not anchored at all.

Non-invasively anchored precompressed sealant at urtainwall to brick insde corner plane change

Non-invasively anchored precompressed sealant at urtainwall to brick insde corner plane change

In window or curtain wall mullions, screws violate the mullions and can compromise the waterproofing principles inherent in the mullion design.  In any substrate metal fasteners introduce thermal bridges that lower or compromise the insulation value of the wall.  EMSEAL systems for wall expansion joints that feature non-invasive anchoring include: Seismic Colorseal, and Seismic Colorseal-DS.

In horizontal plane deck applications, anchors into concrete to secure cover plates are rapidly deteriorated by impact shocks of traffic.  They are also stressed by differential vertical deflection across expansion joints as the result of transient traffic loads.  Finally, anchors into the edges of concrete decks can induce a fault-line of pressure that weakens the concrete’s strength and can result in spalling of the joint edge.  EMSEAL systems for deck expansion joints that feature non-invasive anchoring include:  SJS System, SJS-FRDSM System, Emsheild DFR2, DFR3, SecuritySeal SSF2, SSF3, and Horizontal Colorseal.

 

 

NOTE: The definitions of terms and terminology herein are rooted in the context of use in the field of construction-related joint sealing in EMSEAL’s experience. They are provided with the intent of offering a fuller understanding of the context of their usage. Any suggestions or questions regarding interpretation are welcome and should be directed to content@emseal.com. Thank you.