Ditto to Michaels answer, two years after install and the windows are leaking. Guess what they told me? The install is only guaranteed for one year. My homeowners insurance company sent a structural engineer out, removed the drywall to discover the windows were to small for the opening. Window World installed their mis-measured windows and slapped a piece of plastic around the exterior with calk to cover the gap...which gave way and allowed water entry. Also, the gap between the window and framing was much larger than code allows.
Good luck, worst company I ever dealt with. Follow up terrible and owners don't care. Installers not well trained and if a difficult install they're lost as what to do. Contacting county building dept.was of very little help. Ended up contacting manufacturer for parts and finishing job myself.
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