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

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

Causes Relating to Failure of 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

Present State of the MDB Roof

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

Tentative Long Term Repair Plan

Foam and Coating Application

Foam Application Area

Water Intrusion at

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

Conclusion