Working on the roof It may not be possible to replace a tile immediately. In order to minimise any water damage, weather proof the tile temporarily. Prop up the tiles that overlap the cracked one with wooden wedges, and use a wire brush to clean the surface round the crack.
Use flashing strip primer to coat the cracked area. The primer will ensure a good bond once the flashing strip is in position. Make sure you use enough to cover the width of the strip to be used. Use a section of flashing strip long enough to cover the crack completely. Push the strip into place and check it is well seated. Use a small roller over the strip to firmly push the strip down into position.
Use an applicator gun to inject the bituminous sealant along the crack.
Working in the loft spaceUse an applicator gun to inject adhesive expanding foam along cracks or gaps from inside the loft.
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