When first gate or the questions the first floor debate for a long time, small think best is to install the back door. Several claims for everyone as a reference: 
1. gate precisely to ensure that after the first floor doors and gaps between the floor size. If gate flooring will have one question, is the gap between the door and floor remain larger than small, unsuitable to do? Although for skilled of installation workers can first through advance told floor of thickness to reserved scale, but any engineering are is has errors has variables of (to flat errors led floor errors, and door errors), door big has will ugly and noise role also poor, door small has, a has can door and floor will conflict, II has can due to future wood floor bulge Alice song or door slightly sinking on mutual conflict. 
2. loading the back gate to avoid loading door and flooring often floor between the door frame and a variety of special angle and scale installation difficulties, avoiding the cartridge door floor floors combined with difficulties between the frames. 
3. first ensures the door frame on the floor after floor, door frames and floor gap between glass glue will form on elastic contact, ensure that moisture does not enter from the fracture surfaces of the door frame to door deformation. 
of course, if the gate after the first floor will also have several questions: 
1. relatively heavy, are able to hit the floor, walked up and down and workers are able to scratch the floor. 
2. gate with a certain amount of glue and wood ashes, soiled floor. 
3. no gate, skirting the floor well shut. 
but this is not a large problem, solution is as follows: 
1. mounted around the front door with cardboard and other information covering the floor protected. 
2. can require workers to corridor or terrace, cleaned local cutting saws information, to avoid dust. 
3. baseboard will not load, loading door again to put door or the door a kick line to leave a little length, do not nail, after installing your door gate workers according to the actual situation of the kick line cut and fitted.