Meson Detector Building Roof Repairs

Meson Detector Building Roof Repairs

Prior to the Start of 2007 Repair Activities

MDB Roof After 2007 Repairs Completed

Damage to Membrane as a Result of Snow & Ice June 2009

Torn and Delaminated Coating

Delaminated Flexible Flashing

Water Intrusion & Corrosion at Bands

Causes Relating to Failure of Roof Complete failure of the roof membrane, as stated by GAF consultant from Trinity ERD Elastomeric roof material did not completely adhere to roof deck causing it to pull apart during rain and snow/ice melt Roof deck not completely cleaned Multiple substrates for the roof membrane to adhere to (foam/concrete/metal) Roof corrugations caused ponding of water and ice creating ice and snow slabs up to 1 ton Roof membrane not evenly applied on roof surface Open transition points at top flutes

Present State of the MDB Roof GAF & Riddiford completed a roof inspection Intermediate repairs completed that will take us through the winter & spring Hand application (brush on) of top coat sealant in all twelve flutes Scope of the intermediate repairs Repairs to the flexible flashing Repairs to the blistered and delaminated areas 125 gallons of GAF top coat material used Reduced the roof leaks by approximately 70% Roof will develop more leaks

Tentative Long Term Repair Plan Remove roof presently damaged roof membrane & substrate materials Remove corrugations with 2 layers foam insulation Install knife plate snow & ice breakers Treat foam to metal deck transitions with flash grade topcoat Install base & finish coats of GAF Elastomeric membrane roofing Complete work in two phases Phase 1 complete repairs in 1-3 flutes during 4-5 weeks shutdown summer 2010 Phase 2 complete repairs to remaining flutes during long shutdown 2012

Foam and Coating Application

Foam Application Area

Water Intrusion at

Conclusion GAF standing behind the roof warranty GAF hired Roof Consultant Trinity ERD to evaluate and identify repair solutions including laboratory testing of materials GAF, Riddiford, & Trinity ERD has met with the lab to start development of a repair plan Repair plan due from GAF within the next couple of weeks