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# Most asked 20 thumb rule based Interview Questions

1. Minimum Room Dimensions for Residential Building.

2. Stair Riser in residential building = 130 mm to 190 mm.

3. Stair Riser in office building = 125 mm to 150 mm.

4. Going â€“ 275 mm to 350 mm for public buildings.

5. Going 250 mm to 300 mm for residential buildings.

6. For selecting the rise and tread of a building, the following thumb rules are followed:

2T X R = 550 to 650

T x R = 39000 to 48000

7. The width of steps is 900 mm for residential buildings and is 1000 mm for public buildings.

8. Number of Riser = (Total Height of floor / Height of riser)

9. Number of treads = Number of riser â€“ 1

10. Thickness of R.C.C. I lintel beam 100 mm to 250 mm and 150 mm is more common.

11. Thickness of R.C.C. roof slab is 100 mm to 150 mm (100 Â mm is more common) and that of sunshades is 25 mm to 50 mm.

12. Sunshade projection length in cm: sunshade projection through 450 mm or 500 mm beyond the facing of external wall.

13. Width of verandah is from 1.8 m to 3 m and width of passage is 0.8m to 1.2 m in residential houses.

Â 14. The height of parapet wall should not be less than 0.60 m and not more than 1.2 m above the finished floor level.

15.

16.Main entrance door of a residential building should be of 1000 mm x 2100 mm in size. Other doors should have a minimum width of 900 mm and a height of 2000 mm. Doors for the garage are 2500 mm x 2300 mm and for W.C. and bathrooms are 600 mm to 750 mm x 1800 mm with the single-leaf shutter

17. Thickness of the damp proof courses 20 mm to 25 mm.

18.Thickness of the cement concrete floor is a minimum of100 mm plus floor finish over it. Floor finishes are generally with 10 mm to 20 mm thick cement mortar or tiles.

19. Ceiling height (i.e., headroom) for main rooms of the residential building should be 3000 mm to 3600 mm. For bath and W.C. the ceiling height may be 2000 mm to 2750 mm. (maximum height of the building depends upon types of structure)

20. The carpet area should be 50 to 65% of the floor area.