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When looking for the studs to mount a boiler I found the studs are 18" on center. I even double checked my stud finder by using a magnet to find the nails in the drywall and they corroborate original findings. Now the mounting plate that came with the boiler is designed for 16" spacing, so it won't work as things are now.

My plan now is to mount two 2"x4"s, possibly a x6" on the top, across the studs I have and then mount the plate onto that.

Are there any codes or issues that could conflict with that?

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    This is a video about hanging kitchen cabinets on a cleat. The guy gives some good tips for ensuring you're getting the studs before fastening the cleat to the wall. Might be helpful since the wall's construction is unusual. youtu.be/QPyos9wwQso?t=313 – Jeff Wheeler Oct 14 '20 at 2:21
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Thanks for the clarifying edit.

Code is there to keep the structure safe. It doesn't care if the boiler falls off the wall. As long as you don't cut into structural components, like weakening studs, etc. any mounting solution should be fine on that front. Note that drilling into studs and attaching lag bolts is standard practice and should be fine.

As far as "issues" go, well…that's pretty open-ended. :) Sure, there could be issues if your solution isn't structurally sound. That said, a couple of boards spanning the distance which allow you to mount the plate to those shouldn't add much weight to the overall installation. So as long as you attach the boards using similar technique to what the mounting plate would have used (presumably lag bolts into studs), it should hold fine.

All that said, I'd recommend that you contact the manufacturer and ask them if they have a wider plate or other alternative mounting process. Adding boards to the wall is pretty easy, but it needlessly complicates the structure, and pushes everything an extra 1-1/2" from the wall. It'd be nicer to be able to put the plate right against the wall where it was intended to go. Manufacturers of wall-mount stuff often have optional components that they can provide to customers to allow installation in non-standard situations like this. It's always worth checking with them, in case they do.

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