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:: Low Grade Waterproofing ::
Curtis-McKinley Roofing and Sheet Metal has extensive experience in waterproofing. As
a facet of our holistic approach  to preventative maintenance services, we consider all
building envelope issues key to successfully managing building integrity, from the roof to the

The concept of waterproofing or protecting buildings against the damaging action of water
derives from the need to avoid water and humidity related elements that act negatively upon
constructions. This negative effect can present itself in several ways, creating health
problems, structure deterioration, facility damage and others. Not to mention, that repairing a
building damaged by water can be very expensive!

Permeability most frequent causes are: porous or flawed material, badly sealed splices,
crack existence, building defects and inadequate surface pendant.

However, we can find different kinds of humidity: the one that gets in from the outside
(because of rain, different kind of water infiltrations, ground humidity or underground water),
building’s own humidity (permanent or because of the construction) and the one produced
gradually by the building (because of its service as well as due to condensation and water

Basic conditions for waterproofing involve the surface’s fitness for treatment and its
cleanness. Building waterproofing can be done in a surface with/without the presence of
water and with/without previous treatment.

Building Waterproofing Systems

Based on water’s origin and effects on buildings and concrete, waterproofing systems have
been classified:

  • Surface waterproofing: done with coating plates, bituminous emulsions, vinyl pastes,
    resins and sealants.

  • Integral waterproofing: integrated to the mass of concrete, affecting its permeability.

  • Hydrophanous waterproofing: integrated to the mixing water or used as curing
    systems, allow the improvement of concrete’s characteristics such as workability,
    compression resistance, decrease of reinforcement steel corrosion, decrease of
    fissures and cracks, and extended durability.

Kinds of Waterproofing

  • Rigid waterproofing is meant to seal filtrations, make waterproof concrete structures
    or waterproof coatings. Treatments for rigid waterproofing generally are: concrete and
    cement integral additives, and cement, epoxic, plastic, or metallic coatings.

  • Flexible Waterproofing is intended for structures affected by temperature changes
    and water settlements. This kind of waterproofing is a protection capable of absorbing
    movements without suffering damages that could allow water access. Flexible
    treatments are membranes, hot asphalts, cold asphalts (based in water or solvent),
    polymer emulsions, vinyl emulsions, and acrylic emulsions.

To fit your particular needs, you will probably need to use one or a combination of the above
kinds and systems of building waterproofing.
Curtis-McKinley can assist you to find the
best solution for your building.