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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.


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Deck Ledger Board

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.


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Learn how to properly install a waterproof ledger board using flashing and fasteners. Check out our step-by-step video and detail drawings.

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Make sure your house frame is solid and in good condition before installing a deck ledger board. We list some problem areas to look for before building.

Deck Ledger Board

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.

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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!

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Rotted deck joists can cause homeowners headaches. Learn more about how to avoid, prevent and repair deck joist rot at Decks.com.

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