The surface must be clean and free from dust, grease, loose material and any debris. On concrete and cement substrates, apply Penetrar as a primer before anything else. On clean, rust-free metal surfaces, no primer is needed. The surface just needs to be clean.
FILL ALL GAPS - Posi Screed is mixed to a plaster consistency and used to fill every gap in the ridge system. The overlapping sections between adjacent ridge tiles are filled. The open base sections where ridge tiles sit over the top row of roof tiles are filled. Every cavity, crack and open joint is packed until a completely solid, filled surface runs the length of the ridge. The goal is no gaps, no voids, no open sections — just a smooth, solid continuous surface for the waterproofing to follow.
STRENGTHEN AND SMOOTH - Penetrar is applied with a brush over all filled sections while still workable — or once cured if applying to hardened Posi Screed. Penetrar binds the filled surface, prevents dusting and creates the smooth, flat base the RidgeSeal Strip needs to lie flat against. It also promotes adhesion of the HydroSeal HF base coat above it.
BASE COAT — WET BED - Applied over the Penetrar-treated filled sections. This is the wet bed the RidgeSeal Strip is pressed into. Work section by section and don't let it skin before the strip goes on. HydroSeal HF is adhesion promoted — no primer needed on the prepared ridge surface.
EMBED STRIP - The pre-cut RidgeSeal Strip is laid into the wet HydroSeal HF and pressed firmly along its full length to embed it completely. It's sized specifically for tile roof ridges. Press from centre outward to remove air pockets. Full contact across the whole strip. Overlap adjacent strips by at least 5cm.
OVERCOAT - ENCAPSULATE - Applied over the embedded RidgeSeal Strip to fully encapsulate it within the HydroSeal HF membrane. Allow to dry completely before the final topcoat goes on. The strip is now locked inside the rubberised waterproof coating.
TOPCOAT - A final coat of HydroSeal HF applied over the full ridge system once the overcoat is completely dry. This completes the seamless rubberised waterproof membrane from end to end of the ridge. Allow to cure fully before overcoating with roof paint.
FINISHING TOP COAT - Once the HydroSeal HF system is fully cured, the ridges can be overcoated with a matching roof paint to blend with the tiles. The whole roof can also be painted at this stage for a uniform finish. HydroSeal HF is compatible with most acrylic roof paints.
A homeowner had been patching the same ridge sections for three years running. Every summer the cracks came back in the same places and water was getting through at the ridge base into the ceiling below. The RidgeSeal system was installed — all cracked cement raked out, every gap filled with Posi Screed, Penetrar applied, and RidgeSeal Strips embedded in HydroSeal HF across the full ridge. The ridges were finished with roof paint to match the existing tiles. That was two rainy seasons ago. The ceiling's been dry since.
A hospital facility had extensive ridge failure across several wings of a large cement tile roof. Water ingress through the ridges was causing ceiling damage in occupied areas. The RidgeSeal system was specified for all affected ridge runs. Each ridge was cleared, filled completely with Posi Screed and treated with Penetrar before RidgeSeal Strips were embedded in HydroSeal HF across the full length of every ridge. The work was completed wing by wing to minimise disruption to the facility. No water calls from the treated ridges have been recorded since.
A residential estate had multiple buildings with complex hip roof configurations — multiple ridge runs meeting at hips and valleys, all in various stages of cement failure. The variety of ridge angles and junction points made a standard coating approach impractical. The RidgeSeal system handled every section — Posi Screed filled all junctions and base sections, Penetrar treated the full ridge length and RidgeSeal Strips were embedded in HydroSeal HF across every run including all hip junctions. The full roofs were then painted with a matching roof paint. The estate maintenance manager reports zero ridge-related water calls across all buildings since the installation.
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