Wood is a traditional door material. This is because not only will this material boost the value of your home, but it will also offer a touch of elegance and sophistication. Despite these advantages, wood doors have one drawback: they can expand and swell. But why do doors swell in the first place?

Causes Doors to Swell


Metal roofing expert Burr Roofing, Siding, & Windows shares what causes door swelling as well as tips to prevent and repair it.


Causes of Door Swelling


  1. Temperature variations cause solid wood doors to expand and compress naturally.

  2. The door’s age and usage

  3. Humidity or moisture exposure can be caused by a variety of factors.

  4. Low-quality raw materials were employed in the construction of the door.

  5. The door’s surface isn’t polished enough.

  6. The door frames were misaligned during the installation process.

  7. Door hinges that are loose or dangling


What Is the Best Way to Repair a Swollen Door?


If you’re wondering how to repair a bloated exterior or interior door, remember that it’s not a simple task. If a door has very little swelling that is rubbing against its frame, you may be able to remove it and use a sander to level down the swollen area. 


However, anything more than the tiniest amount of swelling is difficult to treat. Some doors are impossible to repair, and any attempts to do so can exacerbate the problem. Similar to when you call for a contractor to replace a vinyl siding, it’s usually a good idea to get professional advice.


Preventive Measures

Apply Sealer

  • Prior to installation, apply a sealant to the edges of a wooden door to prevent water damage. 

  • Do not rely on the manufacturer’s protective coating as it is insufficient. 

  • Apply external sealer to the door’s corners and underside, avoiding the door’s edges and face. Follow the manufacturer’s instructions for application. 

  • To maximize your protection, perform this preventive precaution at least once every year.


Use Dehumidifier

  • Since the door absorbs so much moisture from the air in your home, a dehumidifier can help. This will keep it from absorbing moisture and bulging out of its regular place. 

  • When utilizing the gadget, make sure your home’s external doors and windows are closed. 

  • When wood is exposed to the heat and cold air of the summer months, it is common for it to swell.


Burr Roofing, Siding, & Windows has been making the remodeling process as easy and fun as possible for Connecticut homeowners for over 50 years. Is it time for roof replacement? You can reach us at (203) 660-2009 or by filling out our contact form.