Can I attach my deck to a hollow block concrete foundation?
Yes, there are products available for anchoring a ledger board to hollow concrete block foundations (concrete masonry unit, CMU). There are a handful of manufacturers that produce epoxy and other adhesive anchors that are tested for use in hollow CMU. These adhesive fasteners must be installed in strict compliance with the manufacturer’s installation instructions. Generally, these fasteners will provide much lower-load resistance than those connecting to solid concrete. Be careful to install a sufficient amount of fasteners based on the loads generated by the deck design. The fasteners must be approved for a wet-use, exterior environment and must provide appropriate corrosion protection.
Most builders prefer to build a freestanding deck rather than attach to a hollow concrete block house foundation wall.
Attaching the Ledger Board to the House Rim
Learn how to properly install a waterproof ledger board using flashing and fasteners. Check out our step-by-step video and detail drawings.
Attaching the Ledger Board to a Concrete Wall
Step-by-step instructions on how to install a ledger board to a concrete house foundation wall using expansion anchors.
Installing A Ledger Board Around A Corner
Follow our tips to properly install a deck ledger board around the corner of a house to keep water out.
How to Seal Your Deck & Best Deck Sealers
Once you clean or stain a deck, it is ready to be sealed. Learn how to properly seal your deck in order to protect it from damage caused by harsh climates and weather at Decks.com.
How to Prepare & Protect Your Deck for Winter
Preparing and protecting your deck for the cold weather is important to ensure the longevity of your deck, especially in cold climates. Learn how to prepare your deck for winter at Decks.com.
More Helpful Resources
Explore Articles by Topic
Footings
Information related to installing frost footings for decks
Framing
Learn structural framing methods
Decking
Learn about wood and composite decking materials
Stairs
An in-depth look at the complex issue of how to build stairs
Railings
How to install guardrails and handrails to meet IRC code
Features
An overview on water drainage, benches, planters and lights
Design
The basics of deck design
Planning
Learn about permits and working with contractors
Porches & Patios
Build a covered deck to enjoy all seasons
Ledger
Proper attachment techniques
Care
Maintain your deck to maintain your investment
Materials
An overview on water drainage, benches, planters and lights
Ledger to engineered floor joists
Explore your options for building a deck onto a house with engineered floor joists.
Vents, Pipes and Spigots
How do you install a deck ledger board around vents, pipes and spigots? We offer two solutions that can solve your problem.
Layout Of The Ledger
Learn how to plan ahead to avoid problems when installing your deck ledger board to the house wall.
How to Remove Scuffs and Scratches from Composite Decking
Removing scuffs and scratches can help make your composite deck look like new. Learn how to fix and prevent your composite deck from future scratches.
How to Sand a Wood Deck
Sanding a deck is important to prevent any wood slivers and imperfections. Use these instructions to properly sand and refinish your deck.
Deck Post Repair: How to Fill Cracks in Deck Posts
The right kind of wood can resist rot, mold, and insects, but they can still split or crack. You can repair the posts before the problem causes structural issues. Read our guide on deck post repair to help your outdoor space last as long as it possibly can.
Explore Articles by Topic
Footings
Information related to installing frost footings for decks
Framing
Learn structural framing methods
Decking
Learn about wood and composite decking materials
Stairs
An in-depth look at the complex issue of how to build stairs
Railings
How to install guardrails and handrails to meet IRC code
Features
An overview on water drainage, benches, planters and lights
Design
The basics of deck design
Planning
Learn about permits and working with contractors
Porches & Patios
Build a covered deck to enjoy all seasons
Ledger
Proper attachment techniques
Care
Maintain your deck to maintain your investment
Materials
An overview on water drainage, benches, planters and lights