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.
Lateral Load Device
Learn about your options for providing lateral load support for your deck. We explain recent code changes affecting deck building.
Attaching the Ledger Board to Brick Siding
Do you have brick siding? You should never attach to just the brick. This is very dangerous.
How to Bug-Proof Your Deck & Floorboards
Prevent bug infestations below and above your deck using mesh, screens, and more. Learn how you can have a bug-free deck this summer with Decks.com.
Can You Paint or Stain Composite Decking?
Most composites don’t require painting or staining. However, if you are considering staining or painting your deck, you can learn how to do so and what you’ll need 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.
Types of Deck Flashing
Compare stainless steel, copper and vinyl flashing materials for waterproofing your deck ledger board.
Lateral Load Device
Learn about your options for providing lateral load support for your deck. We explain recent code changes affecting deck building.
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 Remove Moss & Algae from Your Deck
Moss and algae growth can be detrimental to the integrity of your deck if left untreated.
What is Wet Rot and How Do You Treat It?
Wet rot occurs when water or high moisture levels cause wood to decay. Learn how to recognize the signs and causes of wet rot and how to treat it.
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