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Roof first, then foundation. (not saying that just because I'm a roofer :)
Gutters are likely involved too.
Fixing the foundation should not undo any efforts spent on the roof and gutters.
Do your roof first and stop water entry. As a general contractor we see these all the time. In almost all cases the foundation repair can be done at any point even if it means lifting the house and replacing the foundation. But water entry will continue to do damage if unchecked. So do your roof first.
We agree with everyone that notes to fix your roof first, including any gutters and downspouts. Remember to be sure to run the water AWAY from the home. Water coming down around the drip zone of the foundation is a big problem and can be addressed with those initial steps. Then, you can and should address the foundation with a reputable foundation contractor. Water kills a home. Use the top down rationale and control it. But definitely fix that foundation but after everything above is corrected. Good luck.
We suggest addressing your foundation issues first. Everything rests on your foundation. Even the slightest movement may affect everything above. Before you invest in a new roof, be sure your foundation is corrected.
Agreeing with most of the other comments here, we would suggest fixing the roof first to correct any water issues that may stem from it (i.e. ponding water near foundation, etc.) as well as gutter repair or install to run the water from the roof away from the foundation and home . In addition, its a good idea to look at the ground around the home to ensure that during rain or precipitation events, the ground runoff water is flowing away from the home or at least divert it away from the home if possible (i.e. adding drainage, etc.) before addressing the foundation. If you hire foundation professionals that take the time and care to properly raise the home and replace or repair foundation correctly, there should be no issues with the roof or any other aspects of the home. Hire a fully insured and licensed company always! Hope this helps!
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