Dear K. Kunwadee,
We would like to report for post tension slab Eastin lakeside.
1. Post tension direction y space 0.60 -0.80 m. We can make new shaft between tendon by coring to install new sanitary pipe.
2. Size for shaft should be length 0.50-0.70 m. x 0.50 m width . it should be enough for sanitary riser.
3. AC system should be split type to install CDU at balcony. It is no need new shaft.
If K.Kunwadee would like to stand by for attend the meeting with ACCOR . Please inform to me