New Castle Building Products employs its own, in-house tapered estimating department. New Castle’s Tapered Department can assist you with all of your tapered needs from the start of the bidding process, until the final piece is laid in place. We can turn your rough drawing into a full size drawing usually within 48 hours. Our goal is to provide simple and efficient tapered design to accommodate the roofing professionals. We work with the contractor to assure that all requirements are met, as per the architect’s specs.

Although design theory, job conditions and budget constraints may vary, one factor remains constant, a properly designed and installed tapered insulation system can add years of satisfactory performance to any roof.

Please contact our estimating department for more information on this FREE service.


Tapered Estimator

Catherine Arancibia -


Why Choose Tapered Roof Insulation?

The goal of tapered roof insulation systems is to reduce or eliminate the amount of ponding/standing water on the membrane when the roof deck does not provide adequate slope. Draining water in a timely and efficient manner minimizes the adverse effects that ponding/standing water can have on completed roof membranes. A properly designed tapered roof insulation system not only provides the positive drainage needed but also helps extend the life of the roof membrane.

Ponding water can be the greatest threat to a roofing membrane. It not only shortens the expected life of the membrane, potentially voiding the membrane warranty, but can also lead to more serious problems such as structural deflections of the roof deck and bacterial or unwanted vegetative growth on the roof.

There are numerous ways to design a tapered insulation system for even the simplest of roof plans; however, moving the water most effectively to the specified drainage point is the primary goal.

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