I am building rustic coffee tables out of SPF lumber. I start building the rustic coffee tables immediately after purchasing the lumber from the home depot. When the project is finished I am having them sit on my garage floor, while I wait for a customer to come and purchase the table. Sometimes they are sitting for 2 or 3 weeks.
I have noticed that when I bring the tables to the customers house the coffee tables are not sitting flush when on hardwood flooring, luckily the customers have all wanted the coffee table in their living rooms that have carpet or rugs, so the table has some cushioning and end up sitting flush with the floor.
What I am wondering is how to I ensure that the coffee tables are level no matter what? Should I wait for the wood to acclimatize to my garage? If so, how long should I wait? Also how do I prevent the wood from warping if I have the wood sit in the garage for long periods of time. The reason that I build the projects immediately after being purchased from HD is because I buy the lumber relatively straight.