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Roof / Slope and Drainage

Many building structures are designed with adequate slope toward roof drains, gutters, or drain scuppers.  But often with existing buildings, we find that either the structure didn’t provide adequate slope or the structure has settled or shifted to the point that the original designed slope has changed.

‘Standing’ water on a roof:

  • Adds additional weight on the structure

  • Promotes damaging vegetation growth on the roof

  • Can increase the severity of a roof leak

  • Hinders roof leak investigation

  • Could affect your roof warranty.

A few solutions are the use of manufactured tapered rigid insulation boards, the installation of Elastizell insulating light weight cellular concrete, or the installation of additional roof drains or scuppers.

Tapered insulation boards typically come in manufactured slopes of 1/8”, ¼”, and ½” although some materials can be manufactured to provide a semi-custom slope.  The use of the tapered insulation boards will generally eliminate the problem of ‘standing’ water on a roof, but sometimes an irregular or significant deflection in the structure cannot easily be corrected with a pre-manufactured product.  When this is the case, an Elastizell insulating tapered lightweight cellular concrete deck is the answer.

Elastizell - Positive Slope - Fire Rated Systems

Elastizell insulating lightweight cellular concrete has the advantage of providing a custom slope for the entire roof area, often using compound slopes to solve the inadequate slope in the structure.  Elastizell pours a lightweight cellular concrete on top of a ‘stair stepping’ flat insulation board to provide a new, smooth deck surface ready to receive the new roof membrane.  

Almost any slope and insulating ‘R’ value can be achieved using the Elastizell system.  Although the Elastizell system is most often used to correct inadequate slope, it can also be used solely for the purpose to provide a new deck surface on top of an existing roof system that already provides adequate slope.  Either way, the Elastizell system can often be installed directly on top of an existing roof system, eliminating the expense of tear-off and disposal of the existing roof system.

Installation of additional roof drains or scuppers is also a popular method of eliminating ‘standing’ water on a roof.  When there is access to the bottom of the roof deck, we can often install a new roof drain and connect the new drainpipe to an existing drainpipe of a nearby roof drain.  This allows us to install additional roof drains in the areas of poor drainage.

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