REPAIRS TO MANGLORE PATTERN TILES GALVALIUM SHEET ROOF OVER ROOF PUF SHEET ROOF AND RCC ROOF IN ZONE C UNDER AGE BR 1 AT INS SHIVAJI LONAVLA

Completely removing existing water proofing treatment of any descriptions and any type including top layer of plaster / china mosiac wherever occurs over roof and chhajja surfaces scrubbing the surface with wire brush and cleaning wash down with water to receive new cement plaster / PCC layer and removing the waste material / debris to a distance exc. 1500m n.exc. 2000m etc complete all as specified and directed by Engineer-in-Charge

M/L for rendering 15mm thick in cm 1:4 on concrete roof and chajja surface to get a uniform level surface for laying of membrane treatment

M/L for PCC 1:2:4 type B-1 (using 20mm graded agg) for PCC padding on RCC roof surface finished even and smoother using extra cement all as specified and directed by Engineer-in-Charge

M/L for applying oil based bituminous primer @ 0.10 Kg/Sqm providing and laying 4mm thick. APP modified water proofing membrane weighing not less than 4kg/sqm re-inforced with non woven polyester matt weighing not less than 160 gm/sqm having softening point not less than 140 degree centigrade longitudinal tensile strength not less than 650 N/Sqm, tearing strength of 180N and with thermal insulation with the mineral / graved finish on upper side and laying with torches application and with 10 cm minimum lap in both direction length wise and width wise all as specified and directed by Engineer-in-Charge.

M&L for Surface Preparation with complete removal of all loose and de-bonded concrete/ screed, loose particles, dirt & should be removed. Roof substrates must be pressure-washed with water with a minimum working pressure of 1,400 psi to be used to and/or remove all dirt, dust, chalking and waste products. Remove algae, mold by using bleach solution or biowash.

Complete removal of loose and damaged concrete roof screed in pockets with mechanical cutter. Clean the concrete screed with high pressure water jet to remove dirt and loose particles. Brush applies a bond coat of Dr. Fixit Pidicrete SBR mix in the ratio of 1:1 (URP 1: Cement 1) by volume to make it lump free slurry when applied on in the pre wet surface. Laid to fall roof screed in correct slope and gradient. Mix Dr. Fixit Pidicrete URP 10% by weight of cement in (M20) concrete in ratio of 1:1.5:3 i.e., one bag of 50kg cements: 1.5 times volume of sand: 3 times volume of aggregates: 25L water. Level the repair mortar and finish with trowel. Moist cure should be done for 7days. Air cure screed for 4-5 days, before application of roof topcoat coating system.

M & L for Crack Repair by cutting and widening all visible hairline cracks on concrete roof screed more than 0.50 mm and not giving hollow sound, should be cut and widen in V shape with mechanical cutter in the size (8mm W x 6mm D). Fill cracks with Dr. Fixit PU sealant / Hybrid Sealant with suitable gun and smoothed with a putty knife or trowel. Allow sealant to cure a minimum (72 Hrs.) 3 days.

M & L for Hacking and chipping the surface around the rainwater drain outlet up to 25mm in depth. Apply bond coat of Dr. Fixit Pidicrete URP in the ratio of 1:1 (URP 1: Cement 1) by volume over the corners and pipe insert outlet gaps. Filling the gaps around drain mouth with (PMM) polymer modified mortar mixed with Dr. Fixit Pidicrete URP 10% by weight of cement in the ratio of 1:3. Providing & fixing 100 mm width 225-gsm g/m2 Fiberglass Chopped Strand Mat around the periphery of drain mouth of rainwater outlet sandwiched with Dr. Fixit Wonderproof 100. Apply two thick coats of Dr. Fixit Wonderproof 100 waterproofing coating to completely cover the mesh/fabric and surrounding area.

M & L for Premix Dr. Fixit Wonderproof 100 Components A and B using an electric double-paddle mixer for 2–3 minutes at low speed. Apply the first coat of Dr. Fixit Wonderproof 100 at a rate of 0.80–0.90 kg/m² without dilution, using a lamb’s wool or cloth roller. While the coating is still wet, roll and embed a 225 gsm Fiberglass Chopped Strand Mat, ensuring full bonding without air bubbles or wrinkles. Allow the first coat to dry for 3–4 hours. Apply the second coat at a 90° angle to the first. Overlap the chopped strand mat by at least 5 cm at the joints, ensuring the overlaps are sufficiently wet to achieve proper bonding. Once the surface is dry enough to walk on, apply the second coat at 0.70–0.80 kg/m². Apply additional coats as needed to achieve a total dry film thickness of 900–1000 microns, with a total system material consumption of 1.50 - 1.60 kg/m² over 2–3 coats. Note – Coating should be terminated below the drip mould on the vertical surface. The material has followed technical properties: Attains a Tensile Strength ≥ 18 N/mm2 as per ASTM D 2370; Crack bridging ability, Tear Strength ≥ 160 N/mm as per ASTM D 624, Dynamic Crack bridging as per EN 13251:2016 - No Cracks after 20000 sinusoidal cycles, Dynamic Crack bridging as per ASTM C 1305-2016 - Pass, No Crack, Pass Low Temperature Flexibility (-20 after 1000 Hrs. UV as per ASTM D 1970-2021, Shore A as per ASTM D2240 – 85 , Peel Adhesion to Concrete under wet Condition -24 Hrs. – N As per ASTM C 794 – 11.4 , Abrasion resistance (CS 17 Wheel -1000 Cycle, 1.0 Kg) as per ASTM D 4060 - 7 mg , Depth of Water Permeability @ 10 Bar as per EN 12390-8-2019 – Nil , Water Migratlon Resistance as per ASTM D 7281,-2007 - No Leakage, Pass Spread of flame Class A. Complies with the requirements of EN 13251:2016 for a 25-year service life when used with a 225 gsm Fiberglass Chopped Strand Mat as fleece. The system comes with 10 Years’ waterproofing warranty from M/S Pidilite Industries LTD. For vertical surfaces and parapet walls should be enveloped & coated / painted with Dr. Fixit Raincoat Classic or Dr. Fixit Raincoat Select Waterproof coating system.

Disconnecting existing tanks of exc 500 n not exc 1000 capacity(in ltrs) , setting aside (or lowering if required) for repairs, cleaning, etc. and hoisting if required reconnecting and re-fixing in position after carrying out Roof treatment with all accessories all as specified and directed by Engineer-in-Charge