In 2010 VELUX developed an entirely new line of skylights that feature a No Leak Promise (visit www.thenoleakskylight.com for more information). These new from top to bottom skylights feature three layers of leak protection, an entirely new method of installation, pre-painted interior frames and insulated LoE3 glass that provides more daylight with superior heat control. Properly installed these skylights are warranted from the manufacture to be leak-free for the next ten years. And the new thermal-glass panels are warranted not to fail for the next twenty years.