Wallbarn Protecto-joint is a tough, highly flexible butyl rubber membrane used for waterproofing and protecting preformed expansion joints on roofs, car parks and podium decks.

It has an elongation of 1,000%, far higher than many other expansion joint systems on the market, and can tolerate direct contact with hot materials such as mastic asphalt and hot rubber solutions.

Protecto-joint is ideal for buried expansion joints, roof decks and upstand flashings. It is used for trafficked surfaces and sealing joints in decks where continuous movement in the structure occurs. It can even be permanently immersed in water.

Wallbarn Protecto-joint is vulcanized and cannot be welded or heat bonded. It can be used in horizontal-to-vertical applications, or where the joints are irregular or misaligned, extremely effectively. Because it is so flexible, it can be folded and shaped around even complicated details in one seamless layer. Therefore, no weak spots are exposed in the areas where leaks most often appear.

Since installers do not need to continually fix different sections of the material or install pre-cast shapes and shape the rubber bandage, strength and seal are not compromised.

Wallbarn Protecto-joint can also be folded into C or S bends inside the joint if required due to its flexible nature.

Wallbarn Protecto-joint bonds to good concrete, fully cured asphalt, rubber, steel, aluminium and even fibreglass.

Wallbarn Protecto-joint is manufactured as standard items in 2mm or 3mm thick pre-formed sheet; 200mm
or 400mm wide.

At 200mm wide we produce Protecto-joint with a punched edge, which creates an “over-and-under” bond. At other widths it is a plain bandage.

Because Wallbarn Protecto-joint is vulcanized, it cannot be welded or heat bonded.

Application
Preparation of the substrate is crucially important. Ensure that the area is fully cured, sound and free from debris. All nibs and spots on the surface beneath should be removed and the area sanded to ensure a textured, smooth surface.

• Concrete should be grit blasted or rigorously brushed. Any crumbling concrete must be repaired and cured.
• Mastic asphalt surfaces should be fully cured, and no grease or oil can be present on the surface
• Steel is best prepared by grit-blasting
• The area should be dry and frost-free
• A vacuum cleaner is recommended to remove all dust and dirt from area
• The cavity should be packed with a suitable joint filler

Prime the substrate USING ONLY WALLBARN APPROVED PRIMER.

• For concrete use Wallbarn Pro-coat epoxy primer
• For asphalt, rubber, metal and wood use Pro-coat metal primer.
• Primer should be applied at least 24 hours before installation of Protecto-joint

Protecto-joint MUST be wiped with a solvent such as Xylene or MEK to remove all traces of grease or oil on the rubber surface.This is to ensure that the bond to the adhesive is not affected in any way.

Pour the two part Pro-coat into a suitable vessel remembering not to scrape the tins out as this might affect the adhesion properties. Mix the compound with a low speed paddle drill for at least 2 minutes.

FOR FULL MIXING GUIDELINES PLEASE REFER TO THE WALLBARN INSTRUCTION MANUAL

Do not mix more than 3kg of adhesive at a time since curing times are very fast. The longer the adhesive remains in the pot the faster it will cure. If the mixture hardens in the pot or starts to smoke it cannot be used.

Spread the Pro-coat each side of the joint 50-100mm wide and 1 to 2mm thick with a trowel or spatula. The
mixture will cure at a slower rate when it is spread thinly as the hardening process acts in a volume and heat
process.

Avoid the use of paintbrushes as hairs can become stuck in the adhesive and affect the bond.

Roll the primed Protecto-joint strip out into the adhesive and press into the mixture, allowing it to ooze
through the holes at each side of the bandage.

Press and scrape the adhesive through and around the rubber strip to achieve and over and under bond. Ensure that no bumps or air bubbles are present under the surface.

Allow 2 hours for the adhesive to cure. The adhesive will be cured “to touch” after 90 minutes and ready for traffic after approximately 3 hours (depending on the thickness applied and the surrounding
temperature).

For faster curing times, heaters and UV lamps can be used. FOR FULL CURING INFORMATION PLEASE SEE THE INSTRUCTION MANUAL.

The waterproofing membrane can then be installed across the surface up to the joint. For asphalt surfaces, the second layer can be laid on top of the rubber strip allowing for the expansion joint cavity, with a second layer of Protecto-join bonded on top. Alternatively, finishes such as paving or car park toppings can be installed.

Joint sealants for vertical and horizontal applications are recommended. Only Wallbarn approved adhesive, joint sealants, primers and waterstops should be used with Protecto-joint.

FULL INSTALLATION INSTRUCTIONS ARE GIVEN IN THE OFFICIAL WALLBARN MANUALS. PLEASE SPEAK TO US FOR FURTHER DETAILS.

Wallbarn offers the solution for fully waterproofing and protecting buried expansion joints, bonding to most surfaces and membranes effectively.