How to convert garage - garage door to remain in tact?

how do they seal off a garage door for a conversion without removing the garage? we would want to still have the appearance of a garage and the option to relatively easily go back to using the garage door if a new owner chose to do so. our garage does not form a tight seal along the sides so there is a big draft.... show more how do they seal off a garage door for a conversion without removing the garage? we would want to still have the appearance of a garage and the option to relatively easily go back to using the garage door if a new owner chose to do so. our garage does not form a tight seal along the sides so there is a big draft. it also does not form a seal along the bottom. i assume you add in framework, put insulation in and drywall it... but how is the framework protected from rot?
Update: is there a product made to seal the entire way around the garage for this purpose?
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