clamp for pipe through floor

jrkeat

I have a 1/2" iron pipe for a hydronic system that is going up through a floor. The floor is ~2" of wood layers, so it's good for mounting. I'd like to find a clamp that surrounds the pipe that I can screw into the underside of the floor to hold the pipe in place. McMaster part 9578T29, shown below, is pretty close, but is the wrong diameter and is super expensive. Ideally, I'd like something I can put on after the pipe is installed, but am willing to settle for something like what's pictured.

Alan (California Radiant) Forbes

Pipe riser clamps are usually used above the floor, but under the floor would work just as well. You'd have use some strapping to secure the clamp to the underside of the floor.

jrkeat

That could work. I could use a pair of flat surface brackets to hold it up pretty firmly. They're pretty long--like 8".

EBEBRATT-Ed

With the above riser clamps if they are too long you can shorten the wings by cutting them off up to the bolts

Then you can use screws with washers through the wings to secure it to the floor

pecmsg

Before clamping it in place can I ask why?

Generally the radiator above holds it in place or a saddle below. Clamping under the floor does not allow expansion and contraction.

jrkeat

pecmsg said:

Before clamping it in place can I ask why?

It kind of seemed like the right thing to do, but I'm happy to be talked out of it. Below the floor, I'm connecting it to some pex. So if you disconnect it from the radiator, the pipe can move easily up and down through the hole. The radiator is hung (Runtal), and immobilizing the pipe prevents you from lifting the radiator off. Maybe that's not a problem at all.

mattmia2

You can get copper stubs with a mounting plate and a pex fitting.

JUGHNE

Below the floor if you add a 90 and 6" nipple, the nipple could be held up with a cross block 2X4 secured between joists.
You could always raise the riser as needed as the weight is on the lower wood block. The pipe can expand and contract vertically as long as the holes are large enough to allow easy movement.

jrkeat

I can use a conventional split ring pipe clamp and mount it on a threaded rod to the joist 6" away.