Upon casting and complete curing of roof slab, ROOF CARE’s engineer shall visit the site to inspect the roof and accept the roof for waterproofing and heat insulation works. A preliminary site inspection shall be carried out and any further preparation work if required shall be brought to the attention of the main contractor
Upon completion of cleaning, spray application of the 1st shall commence where a combination of Polyol & MDI is sprayed onto the roof slab including up stands using Gusmer’s combination equipment. The spray applied foam in liquid state hits the slab at a high pressure and penetrates into every crack and pin holes that exist on the slab. In minute it expands 30 times its volume and solidifies thereby sealing the entire substrate. The foam creates an impermeable waterproofing cum insulation layer with high thermal resistance, closing all pores and cracks that exists in the roof slab.
UV Protection Coating
On completion of polyurethane foam application, POLY TEX acrylic liquid UV protection coating shall be applied over entire foam to protect it from UV rays till the water test procedure is completed.
Flood Testing the Roof
Once acrylic UV coating is completely dried (minimum 24 hours), Our Engineer will visit the site to inspect the works completed and give clearance for flood test (minimum 24 hours), On successful completion of flood test a test report shall be prepared and maintained for records.
Panelling and Screed Laying
Upon successful completion of flood test, water shall be removed and POLYFAB geo-textile (120gsm) membrane shall be laid as a protection layer over the entire roof area and our crew will do the paneling work using POLYBOARD expansion joint filler board and pre-mixed cementitious adhesive mortar to attain the desired slope levels prior to commencement of screeding works.
Protective screed of 300 OPC 10 mm aggregate, 25 N/mm2 strength screed will be laid in panels. Minimum thickness of the screed will be 45 mm and average thickness will be 80 mm. The screed will be finished manually by our trained masons and cured as per standard procedures. The screed is added with plasticizers and micro fibres to avoid crack.
Angle Fillets and Joint Treatments
Angle fillets are done after application of POLY BOND PVA bonding agent to the corners of size 100×100 mm. Once screed is completely cured, all construction joints shall be opened and treated using heavy duty POLY SEAL 1 PU Polyurethane sealant and backing rod for accommodating movement of the concrete during expansion and contraction.
Once sealant applied is completely cured, POLYFLEX – COMBO acrylic cementitious coating shall be applied over entire screed including upstands to form a uniform coating of maximum thickness 1000 microns. This coating provide aesthetic look to the roof.