Mule-Hide Blog

Can Helix® Max Low-Rise Adhesive be applied to aluminum-coated BUR Systems?

Posted: 5/4/2020

No. To ensure a tight bond between the built-up roofing (BUR) system and the new single-ply system, the aluminum coating must be removed before Helix Max Low-Rise Adhesive is applied. Removal of aluminum coating is difficult, but can be accomplished by cleaning and power-washing or by physical abrasion. An adhesion test must then be performed to confirm that the coating has been completely removed and the substrate is properly prepared for application of the adhesive.

Why is this necessary? Over time, aluminum coatings lose their bond with the substrate and begin to flake off. If the coating is not removed prior to application of Helix Max, this blistering and bubbling will weaken the adhesive’s bond and leave the new roofing system susceptible to wind damage.

If removal of the aluminum coating is not feasible, insulation or a cover board should be mechanically attached to the BUR system as a separator. Helix Max can then be used to install the new single-ply membrane.

Also note that Helix Max is designed for use with fleece-back single-ply membranes (TPO, PVC or PVC KEE) and should not be used with standard single-ply membranes.

 

Helix Max Low-Rise Adhesive

Helix Max is a two-component, construction-grade polyurethane foam adhesive designed to bond approved roof insulations, thermal barriers, cover boards and fleece-back single-ply membranes to a wide variety of roofing substrates. It delivers quick, VOC-compliant application with strong adhesion, exceptional elongation and tensile strength, and the ability to be applied in colder weather. It goes on in one easy step, saving crews time and hassle.

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