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Whats the max. room size for rcc flat roof without beams?

Thu Nov 05, 2015Total posts : 6
Techman
Techman
Join date: Nov 2015
Topic: Whats the max. room size for rcc flat roof without beams?

What is maximum room size that support rcc roof without beam in between and load bearing walls. I've also seen that in some places of rcc roof steel bars are provided in box form instead of mesh...will it act as small beam without projections? If yes, up to what room size we can use it instead of actual beam?
Fri Nov 06, 2015Post  #1
JAI PRAKASH
JAI PRAKASH

Join date: May 2014
Any extension more than 100 Sq.ft. needs and extra beam in the lantel. So the room size more than 10x10 needs an extra beam in the centre.

 
 
Sat Nov 07, 2015Post  #2
Techman
Techman

Join date: Nov 2015
Sir, I see a lot of houses with bedroom/living room sizes 12ftx13ft,13ftx14ft etc. without any visible beams. In my present house plan the bedroom size is 12ftx13ft but engineer is suggesting more steel rods through the centre within same 4" thickness ie. Not visible beam. Is it right?
 
Sat Nov 07, 2015Post  #3
JAI PRAKASH
JAI PRAKASH

Join date: May 2014
Yes you are correct. That beam is not visible as that has to be inside the lintel.
 
 
Mon Nov 09, 2015Post  #4
S L Gupta (Civil Engg)
S L Gupta (Civil Engg)

Join date: Mar 2008
Dear Tack man
         You should use 12''x 5'' beam in middle with 6 to 8 bars of 16mm with rings of 8mm dia @ 6'' c/c.
 
Wed May 17, 2017Post  #5
Ganesh Jadhav
Ganesh Jadhav

Join date: May 2017
Actually sir ,
If i want my living room 18ft*14ft
Is this possible with invisible beam if yes then give size and specifications of beam

 
Thu May 18, 2017Post  #6
S L Gupta (Civil Engg)
S L Gupta (Civil Engg)

Join date: Mar 2008
Dear Jadav,
          You can lay consolidate beam on 14' side, the size of beam is 18''x7''. 7'' thickness of beam portion 5'' will be in RCC roof and remaining 2'' up side will be covered in concrete below flooring. use 8 nos MS Steel bars of 20 mm dia 4nos on top and 4 nos on bottom with 8mm dia ring 4'' center to center.
 

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