Answer / v.kannan

while joining of new roof slab to existing one you should
ensure whether existing roof having reinforcement projection
for joining or not to new reinforcement. if not you want to
remove the concrete up to 150-300 mm from the edge and clean
the surfaces and existing bar then connect the new one and
we can make the concrete through proper form work. and the
grade of the concrete should not less than M25

Answer / anup sharma

Old roof nd new roof are joined using hilty.
Hilty is the process in which a hole is made in the older
roof by drilling and hilty chemical is inserted inside the
holes and finally new reinforcement is inserted inside these
holes such that the older and the newer reinforcement stay
connected. after that form work is done and the new roof is
casted.

Answer / m.haseeb yaquobi

intering rabar to existin roof

Answer / mahendra mohan srivastava, acc

sorry my dear friends we could not joint New RCC to OLd
RCC, because cement and cement concrete has a property of
srink. but we can take care of that we can taper old joint
and then new rcc will cast.

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