To secure themselves, lenders charge a higher interest rate on such mortgages if they are being offered as a second mortgage. (syndicatemortgages.com)
This is because when you get approved for such a mortgage, you will receive a lump sum, which you can use for expenses like roof repairs and home renovations. (syndicatemortgages.com)
Some investors try to find banks that do offer such mortgages in order to get deals done. (biggerpockets.com)