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Fiberglass
Fiberglass is as strong as steel and can be as attractive as wood and has better insulation than both. A fiberglass door is slightly more costly, but they are becoming more popular because they are the easiest to maintain. They are ideal for any type of climate condition since they don’t expand or contract in response to changing weather. This material offers the most design versatility since it can be painted to match outside exterior trims or include customized finishes, which can make the door look like other materials such as wood. Fiberglass doors are durable, energy efficient and low maintenance. Many people think steel doors are more secure but fiberglass doors can have interior steel frames that provide the same support. They are compatible with most locking systems on the market.
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I too, prefer steel, but as pointed out above, a fiberglass door with a steel inserted frame would give you the best of both worlds.