peipako

Hihi, I am new here and desperately need help for my parquet flooring installation : I hv gotten a quote from Hau Hau to install Burmese Teak Parquet 11mmX50mmX12", and they recommended an independent installer. However, the installer told me if I want to use 12" strips, they need to add wood at the bottom, so that the ends will not pop up. If I do not want to add wood, I will have to use 10" I am trying to stick to our budget, and really do not want to add additional wood. I consulted Hauhau, they said it is not necessary to add wood even with 12" strips. I dont mind to use shorter 10" strip, but HauHau only hv 10" in indonesian, which might not be as nice as Burmese in terms of color. Can anyone advice if it is ok to install 12" directly on cement screed without adding wood? Thanks!!