Installing solar panels on your roof to generate clean, free energy is smart. Drilling holes in your roof to install those panels, not so much. Solar Stack (previously DOUBLE DOWN), created a patented roofing technology that uses a super-strong, code-approved adhesive, in conjunction with specially designed pedestals, to hold roof-mounted solar panels in place, without causing leaks or voiding roof warrantees. Even better, it cuts installation time in half.