PRC was retained by Forest Grove School District to design and provide services for the second phase of a roof replacement project. Phase two of a four phase roof replacement plan to be executed over a four year period on approximately 184,000 total square feet of roof area covering thirty six (36) distinct roof sections on the Forest Grove High School located in Forest Grove, Oregon. Phase two consisted of removal and replacement of an existing 19 year old roof system over thirteen (13) roof areas totaling approximately 83,000 square feet. This replacement project included:
- Removal of the existing roof system including above deck rigid insulation and related sheet metal flashings.
- Installation of a rigid thermal barrier / substrate board over the existing structural steel decking.
- A fully adhered vapor barrier / temporary roof membrane.
- Improving roof drainage capabilities by increasing positive water flow through the addition of above deck tapered insulation and primary / secondary roof drain systems.
- Above deck polyisocyanurate rigid insulation and coverboard to increase the building’s thermal performance to a minimum R-20.
- 2-ply SBS modified bitumen roof system.
- Construction of cold formed metal framed perimeter and divider walls to accommodate the increased roof height created by the addition of above deck rigid insulation.
- Modification of existing metal panel siding at perimeter high walls to accommodate the increased roof height created by the addition of above deck rigid insulation.
- All new 24-gauge pre-coated galvanized steel sheet metal flashings at wall perimeters, curbs and penetrations. New stainless steel flashing installed where soldered seams are required.
- New paint finish at existing concrete walls and metal siding panels to match colors at adjacent new construction areas.