The Piggy-Back is a combination of two mortgages: home-equity loan and a primary mortgage. One will provide for the 80% and the other for 15%. The remaining balance which is 5% as downpayment will be shouldered by you, the buyer, of course. It's a breakdown of 80/15/5. You get the tiniest slice of cake which is bearable for your financial reins. Sometimes, they may also increase your cut to 10% to lessen the risk of a money down.