Concealed membranes

Impeccable installation is critical – accessing for repairs later can be very expensive, if not impossible.

The unsung hero of waterproofing.

The proper application of concealed membranes is extremely crucial, as it is often cost-prohibitive to remediate after the fact.  A multilevel parking structure, or a skyscraper, for example, have parking levels and storage areas that are underground.  Moisture typically comes into contact the concrete or cinderblock walls through the soil or dirt, and if the existing waterproof membrane has a failure, or if no membrane was installed in the first place, these walls can crack and blister.

For walls that can be exposed through excavation, a new waterproofing system can be installed. This usually consists of a synthetic rubber membrane either rolled, sprayed or simply attached to the wall, then a drainage mat, which acts as an initial barrier to the soil.

In cases where excavation is not possible or practical, foam or epoxy material can be injected into holes drilled into the wall in a grid pattern. When this foam material comes into contact with water, it expands to ten times its original size, and hardens, creating a waterproof barrier.

Urban Waterproofing uses Aquafin, Xypex, DeNeef, Sika, Bituthene, and CIM products for its below grade waterproofing projects.

Keys to a successful project…

As with almost all other waterproofing solutions, good surface preparation is essential for the application of a lasting waterproofing membrane.  Whether it is a sheet product, or fluid applied – the same rules apply: the new system is only as good as the substrate to which it is applied.

Pipe stubs, electrical conduit, drains and other penetrations need careful detailing with both sheet and fluid applied membranes.  These areas are especially vulnerable, so proper detailing/lapping at these locations is critical. Terminations are also crucial.  Upward-facing edges need to be protected with termination bars and/or flashing.  Right angles should be eased with a cove bead of compatible material.

With the variety of types of waterproof membranes, it is important to consider some key factors to make sure the best membrane is chosen for the conditions.  Will it be exposed to UV rays?  Will it be exposed to ponding water? What type of topping will go above?  These should all be thoroughly researched and resolved well in advance, as it is oftentimes very expensive, if not impossible to revisit these waterproof membranes and replace once they are installed and covered.

A concealed membrane installation is not complete without a water test to confirm performance.  There is NEVER a better time than immediately following the membrane application to correct any problem, if there is one.  A successful water test gives the whole project team assurance that the membrane will perform as expected.

While very durable in their own way, these membranes are not impervious to puncture and damage, so protecting the new waterproof membranes after installation is an important step.  In most cases, the combination of protection board and a drain assembly will suffice.  Any work, such as topping slabs, pavers, or paving that occurs on top of the membrane after installation must be conducted carefully to avoid damaging the membrane.

Services we provide include…

  • Plaza / Podium Membranes

  • Pool Deck Membranes

  • Planter Membranes

  • Rubberized Asphalt Fluid-Applied Membranes

  • Self-Adhered Sheet Membranes

  • PMMA Coatings

“It is without hesitation that I recommend Urban Waterproofing for any job they set out to do. Their attitude of placing safety and customer satisfaction as their highest priorities makes working with them a real pleasure…”

Jack Herbert, Senior Project Manager, McClier