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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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Create a free account and get instant & exclusive access to all that Decks.com has to offer:

Checkmark 1,000+ How-To articles
Checkmark 80+ Free Deck Plans
Checkmark Deck Planning Calculators
Checkmark Free & Simple Deck Design Tool
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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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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Learn a technique for framing around a cantilevered house bay to properly support your deck.

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