Deck sagging


Old 04-18-04, 07:37 AM
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Unhappy Deck sagging

Recently purchased house has large deck in rear that is not connected to house frame, but is a freestanding structure. The portion of decking closest to house wall is therefore sagging severely due to lack of support directly underneath. How do I put supports under an already sagging structure? How much support is needed? Must the supports be cemented in place? Can I do this job alone? Please help!!
Old 04-18-04, 11:16 AM
Join Date: Mar 2000
Location: Arlington, WA
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Welcome to and the Deck forum.

It has sagged because:

A.) The joists and/or beams were overspanned; or

B.) Footings under the posts were too small; or

C.) Both of the above.

You can probably take the sag out of it by starting at both outside edges and working towards the middle. Pour new footings if needed, let that concrete cure for a few days, then use a hydraulic jack to lift the beam back to level. Once you have the beam level, install new posts.

You can do this without help, but having a couple of friends there to assist you will make the job easier.

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