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High Performance Membrane
What is it and how does it work??
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High performance membrane is composed of a selected SBS modified bitumen applied to a non-woven polyester reinforcement (Soprema Sopralene flam antirock)
Sometime manufacturers also use selected glass strands for extra strength (IKO armour bridge)
All manufacturers uses a grey colored granule surface to protect top side of membrane from abrasion and work traffic
Eliminator & Firestone are also approved
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It looks very similar to ice and water shield or rubber roofing
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The process to apply High Performance Membrane
Bead blast deck (around drains, joints)
Check moisture content with moisture meter
Apply primer
Apply membrane by machine or hand
Roll membrane before paving with rubber tire roller to remove and bubbles and assure better adhesion
Pave at a minimum of 290 F to 320 F per manufacturers recommendation
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High Performance Membrane application continued
The reason for the temperature specification is to have the pavement melt into the high performance membrane for a better sealing
When paving on bridge we cannot use vibratory roller, must us an oscillation roller
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Shot blast the deck to remove foreign materials and sharp
protrusions
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Sand blast by hand areas the machine can’t reach
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Check with moisture meter
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Standard Specifications
Standard Specification 508.04 General states temps must be above 40 degrees F and moisture is at or below 6%
When rapid set patching materials have been used, must be cured a minimum of 72 hours before applying primer
If deck area is greater than 8073 ft² then membrane must be machine applied
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Apply primer. Deck must be clean and dry before applying.
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Apply primer and allow to dry
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Be sure to get all areas, drains, bridge joints, edges etc.
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Applying the High Performance Membrane
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Machine applied
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Changing rolls of Membrane
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Torch applied at ends of roll and around areas machine can’t go
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Torch applied
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Notice overlap pattern from low to high
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Completed deck
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Issues that can arise
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Bubble in the membrane showing up after paving
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Moisture under membrane in several areas
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This is what it looks like after pavement is removed and
membrane cut to let out air/steam
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Another picture of a bubble that formed while paving
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Common issues with high performance membrane
on a rehab job
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Surfaced milled to rough usually caused by not enough teeth on milling drum
Edge along gutter line can’t be done with mill machine. Usually try to leave but contractor should be made to remove because the lip causes an area where membrane can tear and also causes a dam which will cause freeze thaw issues
Moisture under membrane causes bubbles. They must be popped then a patch that goes at least 6” around all areas of the tear
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You can chain drag membrane like concrete and it will make a distinctive sound where it is not bonded
Often contractor wants to remove membrane completely with mill machine to save work of scraping off old membrane. This can be an issue because every bit of concrete taken off of deck means there is that much less concrete coverage over the rebar
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Things to know
The primer is very volatile. No smoking should be allowed anywhere near deck while primer being applied. It can and will ignite causing serious issues
A rep of the membrane manufacturer should be on site during install. Recently the spec has been changed to all allow a member of the install company to be the rep if they attend the training from the manufacturer. This has its own inherent issues