{"id":1277,"date":"2026-01-09T08:35:18","date_gmt":"2026-01-09T13:35:18","guid":{"rendered":"https:\/\/dwwindows.com\/windows-blog\/?p=1277"},"modified":"2026-04-09T08:36:10","modified_gmt":"2026-04-09T13:36:10","slug":"fiberglass-vs-steel-entry-doors-which-wins-after-five-michigan-winters","status":"publish","type":"post","link":"https:\/\/dwwindows.com\/windows-blog\/fiberglass-vs-steel-entry-doors-which-wins-after-five-michigan-winters\/","title":{"rendered":"Fiberglass vs. Steel Entry Doors \u2014 Which Wins After Five Michigan Winters?"},"content":{"rendered":"

Michigan winters put every part of your home to the test, especially your front door. A freezing January morning can create a 75-degree temperature difference between the outside and inside of your entryway. Over time, that constant stress can lead to warping, drafts, rust, and higher energy bills.<\/p>\n

While steel entry doors are often chosen for their lower upfront cost, fiberglass doors typically perform much better after years of exposure to Michigan’s cold, moisture, and road salt.<\/p>\n

Why Steel Doors Stick in Winter<\/h3>\n

If your front door is harder to lock in January than it is in July, thermal bowing may be the reason. Steel expands and contracts significantly when temperatures change.<\/p>\n

During winter, the exterior side of a steel door is exposed to bitter cold while the interior remains warm. This causes the metal to bend slightly, making the door harder to close and reducing the effectiveness of the weatherstripping.<\/p>\n

Fiberglass doors remain much more stable because they are built with a reinforced shell and insulated core. They resist warping and continue to seal properly even during extreme cold.<\/p>\n

5-Year Wear-and-Tear Comparison<\/h3>\n

Surface Durability:<\/strong> Steel doors can dent, chip, and scratch over time, especially from boots, shovels, and daily use. Fiberglass is much more resistant to dents and keeps its finish longer.<\/p>\n

Corrosion Resistance:<\/strong> Steel doors can develop rust, especially near the bottom where snow and slush collect. Fiberglass will not rust, even after years of exposure to moisture and salt.<\/p>\n

Energy Efficiency:<\/strong> Steel transfers cold easily, which can make your entryway feel drafty. Fiberglass provides better insulation and helps keep indoor temperatures more consistent.<\/p>\n

The Problem With Road Salt<\/h3>\n

Michigan road salt is one of the biggest threats to a steel entry door. Even small scratches in the paint can expose the metal underneath. Once moisture and salt reach the surface, rust begins to form.<\/p>\n

Over time, paint may bubble, peel, and flake, especially along the bottom edge of the door.<\/p>\n

Fiberglass does not corrode, making it a much better choice for homes exposed to slush, humidity, and changing weather conditions.<\/p>\n

Which Door Is More Energy Efficient?<\/h3>\n

Entry doors are one of the largest openings in your home’s exterior, so insulation matters. Standard steel doors often have lower insulating values and allow more heat to escape.<\/p>\n

Fiberglass doors usually include a thick polyurethane core with a higher R-value. That means they do a better job of keeping cold air out and warm air in.<\/p>\n

Over several Michigan winters, the added efficiency of a fiberglass door can help reduce heating costs and improve comfort.<\/p>\n

Signs It May Be Time to Replace Your Steel Door<\/h3>\n