Madhya Pradesh Power Generating Company Limited Tender

SOR Item No.-22.23- Providing water proofing treatment over Roof, Wall, Chhajjas, Balcony with Rubberized elastomeric cold applied liquid waterproofing membrane blend of special resin and rubber with more than 1300% elongation (confirming ASTM-D2370-98), at leakage/seepage area consisting of the following operation. (i) Removal of damaged waterproofing treatment if any like bituminous membrane / plaster/ brick bat koba/screeding etc. (ii) Surface preparation: Roughening of surface by scrubbing with steel wire/ Nylon brush/ Removing all dust particles and washing with adequate water to clean completely, opening of cracks in 'V' groove in size of 5mm x 10m (WxD), filling of cracks with elastomeric creak filler/PU sealent repair of potholes and holor making on roof surface by polymer mortar with adding SBR bonding agent. (iii) Providing and applying 1st coating of rubberized elastomeric liquid membrane as primer (ratio 1:2 1 part liquid membrane and 2 part water) by brush/ Roller/ Spray having minimum thickness of 70-80 micron. Allow the coating to set in natural air for minimum 2 hrs, then put reinforcement by laying 45gsm fibre glass mesh and applying 2nd coat of rubberized elastomeric liquid membrane (Ratio: 1 part membrane and 20% water) with minimum thickness 100-120 micron. Allow the coating to set in natural air for minimum 12 hrs. (iv) Providing and applying 3rd coat of rubberized elastomeric liquid membrane (Ratio: 1 part membrane and 10% water). Total DFT (Dry film thickness) thickness after 3rd coat must be 280-300 micron and consumption in three coats @ 6.5kg for 10sqm. (v) Providing and applying 4th and 5th coat of High quality waterproof membrane in white colour, single component special synthetic resin based flexible thixotropic white color coating with excellent UV resistance (SRI - 144) with more than 300% elongation (confirming ASTM D 412-98) in ratio: 1 part membrane and 10% water thickness of 200 micron DFT in two coats, with average consumption @ 5kg per 10 sqm. After application of fourth coat let it air dry for minimum 3 hrs before application of fifth coat. (vi) The treated area must be tested for water leakage/seepage by flooding with water for 48 hrs (vii) Application of membrane coating shall be got done by authorized applicator of manufacturer. (viii) 5 years of service guarantee to be provided. All above operations to be done in order as per direction on Engineer-in-Charge.