Degree of boiler floor level?

Rincon

Hi folks -

I'm in the middle of a new WM steam boiler installation. Contractor is a respected outfit for steam heat, skilled crew, but they mentioned something about the pad level looking a little off. They'll be back tomorrow to finish the installation including the near piping but going down to check it out in detail this evening there's a 5/8" tilt towards the water feeder side. Is there a rule of thumb on how level this needs to be?

For all I know, they plan to remedy it in the morning, but I'd really like to have an idea of whether this tilt is within reason or if I need to fall on my sword for this since this is a (hopefully) one-in-several-decade process. And, if it's too much tilt, I'd sure like to nip it in the bud before the installation is finished. Similarly, what's the consensus on [metal] shimming it?

Steamhead

The boiler should be level. Shim it as needed.

BobC

Use aluminum shims so rust won't be an issue.

Bob

New England SteamWorks

I use plastic shims from Amazon, but shims will do. When you install steam boilers, -a level surface is a real luxury.

Dirt with rocks is kind of normal....

EBEBRATT-Ed

4" square electrical box covers make good shims cheap and readily available at the hardware store