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.
Ledger Board Fasteners
Compare types of deck ledger board fasteners like lag bolts, through bolts & structural screws. Learn how to choose the right fastener for your ledger board.
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.
Pressure Washer Buying Guide
When it comes to cleaning your deck, it's important to choose the right pressure washer. Use this pressure washer buying guide from Decks.com to help with your decision!
Deck Maintenance Checklist
Wondering how to best care for your deck? Download our comprehensive deck maintenance checklist to ensure your deck is safe and lasts for years at Decks.com.
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.
More Helpful Resources
Explore Articles by Topic
Footings
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Framing
Learn structural framing methods
Decking
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An in-depth look at the complex issue of how to build stairs
Railings
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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
what if my deck has no flashing
Our inspector discusses what you should do if you deck ledger board isn't properly flashed.
Attaching the Ledger Board to Brick Siding
Do you have brick siding? You should never attach to just the brick. This is very dangerous.
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.
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.
Deck Maintenance Checklist
Wondering how to best care for your deck? Download our comprehensive deck maintenance checklist to ensure your deck is safe and lasts for years at Decks.com.
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