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How to Anchor Deck Stairs to Concrete

Stair stringers should always land on a level and well-drained surface. If you are landing on a concrete pad or a patio, this should not be a problem. However, if you are landing on the yard, you may want to install paver blocks or fill the area with compacted gravel to promote drainage. Make sure you are using .60 retention pressure-treated wood that is rated for ground contact.

You should install footings at the bases of the stringers to prevent frost heave. This is not always required, but we seriously recommend it. With frost footings in place, you can use a concrete anchor, base plate and short post in order to create a solid ground connection. A 3' x 3' level landing area is required at the base of all staircases. The ground may qualify if it meets the requirements. 

Below are steps to create a base, if needed:

Use your jigsaw.
Use your jigsaw.

Notch out the bottom front of the center stair stringers to accept a 2x4 base plate.

Make sure your stringers are level.
Make sure your stringers are level.

Fasten the base plate to the stair stringers with screws.

Locked in place.
Locked in place.

Use a hammer and drill to install 1/2" x 3" sleeve anchors through the base plate into the concrete pad.


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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
Staircases

How to Anchor Deck Stairs to Concrete

Stair stringers should always land on a level and well-drained surface. If you are landing on a concrete pad or a patio, this should not be a problem. However, if you are landing on the yard, you may want to install paver blocks or fill the area with compacted gravel to promote drainage. Make sure you are using .60 retention pressure-treated wood that is rated for ground contact.

You should install footings at the bases of the stringers to prevent frost heave. This is not always required, but we seriously recommend it. With frost footings in place, you can use a concrete anchor, base plate and short post in order to create a solid ground connection. A 3' x 3' level landing area is required at the base of all staircases. The ground may qualify if it meets the requirements. 

Below are steps to create a base, if needed:

Use your jigsaw.
Use your jigsaw.

Notch out the bottom front of the center stair stringers to accept a 2x4 base plate.

Make sure your stringers are level.
Make sure your stringers are level.

Fasten the base plate to the stair stringers with screws.

Locked in place.
Locked in place.

Use a hammer and drill to install 1/2" x 3" sleeve anchors through the base plate into the concrete pad.


Popular Stairs Articles
Staircases

Box Steps and Stairs

Learn how to build a set of box platforms to act as stairs for a low deck. You don't need to cut stair stringers.

Staircases

Support Long Stringers

Long stair stringers may need extra support from installing a brace at mid-span.

Staircases

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