SIDE WALLS

During the MONSOON it is found that there is severe leakage through side walls of buildings. Lack of rounding at the wall end of window weathershed can lead to seepage through the crack at the wall junction.

• Correct the waterproofing on all weathersheds as per sketch provided in the section below for Chajjas .

For damp patch on the wall refer to sketch 1.

• Chip off loose plaster at the brick wall. Before chipping mark the plaster patch with chalk and run a tile cutter 6” away from the outer edge of the marked patch. This helps to isolate the patch from the rest of the sound plaster. Then replaster with waterproofing material.

For beam/wall, column/wall junction type problem refer to Sketch 2 & 3.

• Fix a galvanised expanded mesh ½" x 1" diamond shape of 6" wide strip ( 3" on either side) on wall and beam with plumber nails.

• Replaster the patch with 1:3 cement sand mortar with 1% Superplasticizer. Provide a 6mm x 10mm deep groove around the repaired portion. After completing repair plaster, provide a flexible sealant in the groove to prevent the crack from reappearing.

If the leakage is between the joint of beam / brickwork or column / brickwork, the plaster in shaded portion should be removed. As seen in the picture a galvanized expanded mesh is fixed on either side of beam / column and brickwall.

Finally, apply waterproof acrylic coating to match the present colour of the building.

CHAJJAS (WEATHERSHEDS / SUNSHEDS)

SUNSHEDS / WEATHERSHEDS show corrosion damage due to seepage of water from top through the junction between the brickwall and sunshed. Sometimes the construction is faulty with inverted pardi at the edge of the sunshed.

The accumulation of leaves, dirt and dust causes accumulation of water for days together and this leads to corrosion damage.

Repair Procedure

1. Remove inverted pardi if possible. Otherwise provide at least 3” dia PVC pipe outlet.

2. Repair soffit (bottom side of the chajja) with same procedure as for the procedure for repairs to concrete damaged by corrosion.

3. Redo waterproofing using brickbat coba method. The thickness of the coba can be 75mm near wall end and 40mm at the outer edge.

4. During the making of watta, there is a tendency to complete the work only with cement mortar. Small brick bats (pebble shaped) should be inserted in the watta slope to prevent shrinkage cracks.

5. Provide expanded mesh as shown in the figure and redo plaster. Mesh can be used when excessive damage is observed.