The short answer
Common Causes
The most frequent reason a deck separates from the house is a loose or improperly attached ledger board. That board is the main connection between your deck and the wall of your home. If it was nailed instead of bolted, or if the fasteners have rusted, the deck can gradually pull away.
Water damage is another major cause. Rain and snow melt can seep behind the ledger board, soaking the wood and the wall structure behind it. Over time, that moisture rots the wood and corrodes metal connectors, making the connection weak. The deck then sags and pulls away from the house.
- Check the ledger board for gaps between it and the house wall
- Look for rusted or missing screws, nails, or bolts
- Inspect the area where the deck meets the house for soft, dark, or crumbly wood
- Look for visible rot or water stains on the wall behind the deck
- See if the deck sags or slopes away from the house
- Check the support posts for heaving or sinking
Water Damage Risks
Water is the hidden enemy of any deck attached to a house. When rain or snowmelt runs down the house wall, it can get behind the ledger board. That moisture soaks into the wood and the wall's framing, leading to rot that weakens the entire connection.
Even a small leak can cause big problems over time. The wood swells, the fasteners loosen, and the deck begins to move. If you notice the deck pulling away, you may already have water damage inside the wall. Acting quickly can prevent the damage from spreading to the house's structure.
- Look for water stains on the wall near the deck
- Check the flashing and sealant for gaps or cracks
- Feel the wood near the connection for softness or dampness
- Look for signs of mold or mildew on the wall or deck boards
- Inspect the area after a heavy rain for moisture buildup
Structural Concerns
A deck pulling away from the house is not just a cosmetic issue. It is a structural problem that can make the deck unsafe to walk on. The deck's weight is no longer properly supported by the house, so the deck can collapse if you put too much weight on it.
The wall of your house may also be damaged. The ledger board is usually attached to the rim joist or the wall studs. If water has rotted those structural members, the wall itself could be weakened. That is a serious concern that needs professional evaluation.
What to Do
Start by inspecting the connection yourself, but be careful. Look for obvious signs of rot, loose fasteners, or gaps. If you find any, you need to act. The longer you wait, the worse the damage becomes.
You may be able to reattach the deck if the damage is minor, but that can be tricky. The ledger board needs to be properly bolted to the house, and any rotted wood must be replaced. If the wood is soft or the gap is large, you likely need professional help.
A water damage inspection can reveal the extent of the problem. Pros can check for moisture behind the wall and assess the structural integrity. They can also help you understand what repairs are needed and what caused the issue in the first place.
- Do not use the deck until it is safe
- Take photos of the damage for your records
- Keep children and pets away from the area
- If you have a water leak, turn off your home's water supply if you can find the shutoff valve
- Contact your insurance company to ask about coverage for water damage
- Call a local water damage pro for an inspection
Preventing Future Issues
Prevention is easier than repair. Inspect your deck and its connection to the house at least once a year. Look for gaps, rust, and signs of water damage. Catching a problem early can save you from a costly repair.
Make sure the flashing and sealant where the deck meets the house are in good condition. Replace any cracked or missing sealant. Keep the area clear of debris that can trap water against the wall.
If you live in Layton, keep your shutoff valve location written down in case a leak ever occurs. Knowing where it is can help you stop water damage quickly. Also, consider having a professional inspect your deck if you are unsure about its condition.
Water damage does not wait
Phones are answered 24/7 for Layton and nearby communities.
Call Now (801) 383-0232Frequently asked questions
Can I fix a deck that is pulling away myself?
You can try if the damage is minor, such as a few loose screws. But if the ledger board is rotted or the wall is damaged, you need professional help. Improper repairs can make the problem worse and create safety hazards.
How do I know if the deck is unsafe?
If you see a large gap between the deck and the house, or if the deck sags or moves when you walk on it, it is unsafe. Also, if you notice soft, dark wood or rusted fasteners, keep off the deck until a pro inspects it.
Will my insurance cover deck damage?
Policies vary, and your insurer decides what is covered. Water damage from a sudden event, like a burst pipe, may be covered, but gradual damage from wear and tear often is not. Check your policy and talk to your insurance company.