Excuse me: how to use the steel joist to build the attic and the I-beam to go deep into the load-bearing wall. How many centimeters? Do we need to weld the main reinforcement?
Use I-beam to build attic, I-beam should go deep into bearing wall, 8~10 cm, need not be welded with main steel bar.
Reinforced concrete cast-in-place. Reinforced cement belongs to the practice of civil procedure, but there are additional conditions, there is the original wall plate is connected with the interface structure of steel bar or other fasteners, otherwise the weight of reinforced concrete is not generally a support or fixing piece can be fixed, maybe there will be a security threat. The advantages of reinforced concrete floor is when people walk on it, generally do not shake what sense, nor what sound (unless the floor is very thin, the disadvantage is that the cement floor) is very time-consuming, pouring good, pure maintenance time will be more than a month, the construction time and in front of the 2 months.
Channel or I-beam construction. Under normal circumstances, the use of channel steel on the line, but with the bending strength of I-beam will be higher, of course, the cost will be higher, but also occupy more space I-beam height. The advantage of channel steel construction is that it is quick to use. It does not need to wait. The disadvantage is that the channel made attic, when people walk in the above, there will be a certain shaking sound, the smaller channel specifications, the greater the shaking. The adoption of channel steel is a recommended practice.
