Can I Attach a Deck to My House Safely?

Safely Attaching a Deck to Your Home

The ledger board – the piece of lumber that attaches your deck to your house – is one of the most critical components of deck construction. Done correctly, it provides a solid, waterproof connection. Done poorly, it can lead to structural failure and water damage.

Why Ledger Attachment Matters

The ledger board:

• Transfers loads from the deck to the house structure
• Must be waterproof to prevent rot and moisture intrusion
• Requires proper fasteners to handle dynamic loads

Proper Ledger Installation

A code-compliant ledger installation includes:

1. Removing siding – The ledger must attach directly to the rim joist or wall framing
2. Flashing installation – Z-flashing or self-adhesive membrane prevents water infiltration
3. Lag bolts or structural screws – Sized and spaced per engineering requirements
4. Proper spacing – Allows for water drainage behind the ledger

Common Mistakes We See

When evaluating existing decks, we often find:

• Ledgers attached through vinyl siding
• Missing or improperly installed flashing
• Undersized or corroded fasteners
• Gaps that allow water penetration

When Ledger Attachment Isn't Recommended

Some situations call for a freestanding deck:

• Stucco or EIFS exteriors – Penetrations are problematic
• Cantilevered floors – May not provide adequate support
• Historic homes – Preservation concerns may apply

The Pegasus Approach

Our team follows manufacturer specifications and building codes precisely. Every ledger we install includes:

• Proper flashing and waterproofing
• Engineered fastener patterns
• Inspector-verified connections
• Written warranty coverage