S.D. Carruthers Sons, Inc.

Scope Of Work

Existing Roof

Smooth-Surfaced Built-Up Roof System

Problem

Being one of the largest turned parts companies in North America, Manth-Brownell’s 128,000 square foot complex houses millions of dollars of computerized machining equipment.  This high-tech equipment was at increased risk due to more frequent roof leaks, especially at tie-ins to numerous buildings constructed over the years.  Furthermore, a decision was made to remove the fiberglass batt insulation on the underside of the roof deck, leaving the roof structure inadequately insulated.

Solution

Seamless Spray-Applied Polyurethane Foam (SPF) Roofing System.

Application

After evaluating various single-ply and spray-applied systems, management selected a seamless spray-applied polyurethane/silicone system to be installed by S. D. Carruthers.  Particularly appealing was the seamless, self-flashing feature of the SPF system in dealing with difficult tie-in details, which would have been problematic with alternative systems. Other benefits included the superior insulating properties of the closed-cell polyurethane foam and the ability to custom taper the foam insulation during application for improved drainage.

Application of the  SPF system included the following:

Removal and replacement of isolated areas of wet insulation.

Cutting and fastening of blisters in the built-up roof membrane and securing of loose felts.

Priming the built-up membrane to assure proper adhesion.

Spray-applying two layers of seamless polyurethane foam insulation, with a minimum compressive strength of 40 PSI.

Field tapering of the foam insulation for improved drainage.

Spray-applying two layers of silicone protective membrane coating.

Applying ceramic granules into the top coating layer, providing increased durability and a non-skid surface.

Providing a full-system labor and materials warranty, with manufacturer’s follow-up inspection program.