You can treat a home under construction as a qualified home for a period of up to 24 months, but only if it becomes your qualified home at the time it is ready for occupancy.  The 24-month period can start any time on or after the day construction begins. As a qualified home, the interest paid within certain limitations may qualify as deductible mortgage interest.

You may deduct home equity debt interest as an itemized deduction, if all the following conditions apply:

A loan that is secured by your personal residence but is taken out for reasons other than to buy, build, or substantially improve your home, such as to pay off personal debts, may still qualify as home equity debt.  Home equity debt is limited to the fair market value of the home reduced by home acquisition debt, up to a total of $100,000 ($50,000 if married filing separately). You may deduct the interest paid during the year on home equity debt as an itemized deduction on Schedule A (Form 1040) (PDF), Itemized Deductions, generally on line 10.

Casualty losses not compensated for by insurance or otherwise are generally deductible only in the year the casualty occurred, however, special rules apply to casualties occurring in a federally declared disaster area. Consider the following:

For more information on disaster area losses (including flood losses), refer to:

The mortgage interest on a second home which you use as a residence for some portion of the taxable year is generally deductible if the interest satisfies the same requirements for deductibility as interest on a primary residence.
 

No, while you have to deduct the points over the life of the loan (amortize) you don't divide the points by 30.  Instead you divide the points by the number of payments over the term of the loan and deduct points for each year according to the number of payments made in that year.