Radiant Question

EJW

What would you do if you are laying out your tubing for in slab and you dont have enough room for the last circuit? Do you leave it out?

Ken_8

At the manifold?

Or in the floor?

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DaveGateway

Assuming........

it's in the floor, you tube it short and note it. If I have varying loop lengths at pour time I note it as best as I can to assist in initial start up balancing. Leave no square foot unheated unless it's unnecessary to heat the space. If you don't have enough room in the slab for the last loop you either over(maybe)extended your loop lengths or missed on overall sf. If you are comfy with the loop lengths and covered the space you can get a smaller manifold or cap it.

EJW

My concern was having the last loop much shorter than all the rest. I should have been more clear at first, this will be a finished basement w/bath. I just have never heard an answer for this. Say I put down 4-200ft. circuits and start to lay the last one and find I only have room for say 125ft, then what? Sorry for the stupid question. Thanx

Robert O'Connor_7

Radiant ?

Why not use the extra tubing under the bathtub or in the wall of the compartment?? ..Robert O'Connor/NJ

Floyd_5

There are NO stupid questions....

What I would do is crowd the other loops together more to give me the room to get all of the pipe for the last loop in.
More tube is always better than less....
I usually don't finish tying the frist loops till I know how things are going to come out, espec. on a smaller job. On a big floor you can fudge a bit when you see how things are going and not have it matter. on those joba I usually run the outsides first and make the runs plenty close together then if I need too I can stretch things on the inside runs and no one will ever notice it because it's on the inside of the floor.
I even ran out of tubing in the middle of a 50 x 75 slab and left a hole in the middle with no tubing.....no one will ever know it but me.....heats just fine....

Hope that gets you close to what you wanted to know.

Floyd

Mike Kraft_2

Hind sight being 20/20

I'm guessing the tube is in,hence the no room for the extra.If not then use 230' loops X 4.Increase your centers on the exterior walls to 6" centers.I am assuming it's 1/2" tubing.

cheese

Ted_5

Did you do a heatloss ?

What does the design tell you? How much tube should be in the bath? There is no problem having a shorter loop off of the same manifold if you have a good flow balance valve on the manifold! You should be looping each room off of the manifold and have the right amount of tube and flow to properly heat that room, not equal loop length. Do the math ahead of time, not when you are installing!
> 90% preperation and 10% perspiration!!!

Ted

hr

You really

need to pack in all the tube the design calls for. I rearrange the spacing to make sure the loop fits. Cut it short at a last resort

hot rod

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Jed_2

Basement?

You mentioned this is a basement. Is it a daylight basement, backfilled on four concrete walls, split level with partial wall exposure? It depends. Is there a boiler room partitioned off in the finished basement floor plan? Where, in the floor plan layout, is that last loop runing? Was there a tubing layout done? If just for "the record", I would recommend one. Basements below grade in many cases are a waste of tubing, or are over-tubed.

Jed

Bill Nye

EJ

Most manifolds these days have a valve on the supply outlet . You can set your flow rate by the number of turns you open the valve. If you get a heatloss done with the stadler viega or wirsbo programs it will tell you the number of turns to open your valve.

So, just run your tube in the "short" loop and then adjust the flow with the valve. Like they say. "ain't no big deal"

Unknown

hopefully

Your manifold has individual loop balancing valves, like all good manifolds do. If so you should have an instruction manual that explains how to set the valves for loops of different lengths.
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