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Extending my RCC roof.

Wed Jul 11, 2012Total posts : 6
Ashok Vashisht
Ashok Vashisht
Join date: Jul 2012
Topic: Extending my RCC roof.

I was forced to partially (900 sq feet) complete my ground floor in March 2012 due to time constraints arising out of a HUDA inspection. Now I plan to plan to add the balance area of ground floor (1100 sq feet). This requires joining the old RCC roof to the new one.The details are :-

1.The frontage is about 80 feet accross, the wall at the edge is 9 inch thick.
2.The construction uses RCC pillars.
3.There will be the 1st floor constructed above - so water leakage may not be a big issue.
4.I have used branded (TATA) steel in construction. 

How can I do this successfully ? Any now techniques which will help me successfully join the RCC slabs ?

Thanks!
Wed Jul 11, 2012Post  #1
S L Gupta (Civil Engg)
S L Gupta (Civil Engg)

Join date: Mar 2008

Dear Ashok

       I think that you have left the steel bars from old slab for new slab. If this is the case than overlap the steel bars of old slab and new slab and the over lap length should not be less than 50d. In case you have not left the steel bars than give bearing of the new slab atleast 4'' on the wall and the surface of the old slab should be cleaned and cured before laying the new slab. For more instruction about RCC please visit the website gharexpert. com conc subsection in construction section.

 
Wed Jul 11, 2012Post  #2
Ashok Vashisht
Ashok Vashisht

Join date: Jul 2012
Dear mr.Gupta,

Yes, I have left Steel Bars (as an overhang) about 2 feet from the walls edge. Should I weld the overlapping bars for better strength as opposed to tying them with wire ?
 
Thu Jul 12, 2012Post  #3
S L Gupta (Civil Engg)
S L Gupta (Civil Engg)

Join date: Mar 2008

Dear Ashok

         It is not necessary to weld the bars, tye them with binding wires. If you want to weld these bars than care should be taken that the new bar must overlap in 2 feet length and welded at least on three to four points, avoid neck to neck welding i.e. end to end welding which is harmfull.

 
Fri Jul 13, 2012Post  #4
Ashok Vashisht
Ashok Vashisht

Join date: Jul 2012
Thanks, Mr.Gupta. That information really helped as I had to decide in case of welding whether I would go for end to end v/s neck to neck.
 
Tue Jul 17, 2012Post  #5
Ashok Vashisht
Ashok Vashisht

Join date: Jul 2012
In this context one more question - when the new concrete mix is being laid -

Q1 - Any chemical need be applied to the old concrete edge for better jointing ?

 
Wed Jul 18, 2012Post  #6
S L Gupta (Civil Engg)
S L Gupta (Civil Engg)

Join date: Mar 2008

Dear Ashok

         There is no need of any chemical to be applied on the old concrete. you should clean the old surface by brush or broom and roughend it by chiseling and wash throughly. Then cure the old concrete and kept it wet by wrping with wet gunny bags well before 2 -3 days before laying the new slab. At the time of laying the slab put shullury of cement and water on the old surface and proceed further laying the RCC slab of your dream home.

 

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