You can withdraw up to $10K from your tIRA, or any IRA, exactly once in your lifetime; but it must be for a "first time homebuyer", which can either mean that it is actually the first home you have ever bought, or you haven't owned any real estate property in the past 2+ tax years; depending upon who you ask (IANAL). Either way, if you have owned a home in the past 2 years and you try to do this, you will end up with a 10% penalty. If you ever try to do this again, in order to get the other $8K, you will end up paying a 10% penalty.
Don't do this.