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Ceramic tiles are normally laid on a cement base. If the floor has any flexibility at all, the tiles will wind up cracking. But if you do have to install tiles on top of wood, then yes, the wood has to be sealed because the grout is mixed with water, which can damage unsealed wood.
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Is it necessary to lay backer board before you lay ceramic tile on the floor?
Yes on wood, no on smooth solid concrete
What should I know before installing hardwood floors?
Before installing hardwood floors, you should know the size and costs of this project. YOu can find tips at http://www.hometips.com/diy-how-to/installing-hardwood-floors.html The most important thing to know before installing hardwood floors is the amount of flooring you will need. Make sure you pick out a floor that is durable and will last for a long time. Also, low maintenance floors are great!
Is it necessary to dry clean the conical flask before use?
yes
Why is comparing examples necessary before making a generalization?
you need to include all of the details in making your generalization
Do you need to prime floor before screeding over ceramic tiles?
Might try to rough up the surface with a power sander & emory cloth but a primer wont do much good, wouldn't waste my time or $$
