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Paving Day

April 11, 2013 |

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We are DIYing our moms a Duplex in Alaska! Check out our progress so far as we owner build a home, step by step. Read the Momplex blog here.

posted by Ana White

No we haven't given up on the Momplex.

The Ram just may or may not have taken one comment about taking a fishing break a little too seriously.

But truly, it's a huge project, and we can't focus on how much there is to do, how much we've done, or anything like that. What works for us is to set small daily goals, and work toward completing it. One board at a time, one nail at a time, one piece of drywall at a time.

Or in this case, on loop at a time.

Paving Day

To put an above floor radiant heat system in the Momplex, we first layed strips of 3/4" plywood in pattern on top of the subfloor. There's 3/4" gaps in between for running tubing of hot water through the floor. Then we placed heat transfer plates (basically aluminum foil, just a little thicker) in the grooves. The heat transfer plates will draw the warmth out of the tubing and spread it across the floor.

Today, we'll be putting the tubing in the grooves and hooking up to manifolds.  If this was a road, today would be paving day!

Paving Day

Here's the manifolds we have purchased. We've been kicking ourselves for not just making up our own as we did for the water supply lines because with the off the shelf manifold, we have to modify it anyway to suit our needs. 

The manifold comes as one so that it can be pressure tested.

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We cut it apart into two manifolds, one for a supply and one for a return.

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And then mount to a board,

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We stagger so the supplies and returns are adjacent - meaning the first on the top row is the beginning of one loop and the first on the bottom row would be the end of the same loop.

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Then on the ends, the manifolds elbow off to the main supply and returns that run to the boiler.

Making sense to you?

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But we have one messy problem. It's kinda like a freeway system all ending at the same spot. The mother of all mergers ... only there's no overpasses. Tubing lines can't cross over each other.

The manifold is designed to sit inside the back closet. Eight lines need to be run to and from it. And they can't overlap.

We've been dreading cutting out plywood groves to manage all this ... even considered just laying plywood down and getting a 3/4" router bit and cutting channels out.

But the Ram had a brilliant idea.

What about an underpass?

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Why not fill the closet with plywood - it does not need to be heated.

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And then drill holes at the end of each water line

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Like this ...

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Here's from the underside ...

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And then end each loop by threading the pipe through the drilled hole ...

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And up to the manifold?

Pretty smart, eh?

I thought so!

The tubing doesn't bend super well - it's more rigid and you don't want to kink it and create a leak. This method was super smart because it put the water lines right up under the manifold at the right angle.

Paving Day

From the manifolds, we just start placing tubing in the grooves.

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This is the easy part - we've already built the road, it's just time to pave it!

It really helps to have one person hold the roll

And another person place the pipe in the grooves.  We are very thankful to Junior for helping us out with the heat system.

What started out as one line snaking down the hall

Quickly became entire rooms filled with tubing.

Here's the kitchen and hall area

And around the stairs.

Where the tubing bends, it tended to pop up out of the grooves.  So we took scrap pieces of heat transfer plates and stapled those suckers down.

For those void ends, we filled in with wood pieces, cut to pattern, following the natural curve of the pipe.  The scrap pieces are used to fill in the corner voids.

And then we loop it all back to the manifold in the closet

The Ram's underpass merger system worked like a dream!

Tubing lines get connected to manifolds,

And it all passes the pressure test!

I can hardly believe it, we've completed the upstairs heat system!

We'll still need to run supply and return lines to the boiler from the manifold - and of course install the boiler itself - before we start getting heat out of it, but it's an awesome feeling to know one more step is done!

Thanks for letting us share our Momplex story with you!  Have you installed radiant?  Would you?  We'd love to hear your story too!

clips

Wow ... Spaghetti time!

The "underpass" is a brilliant idea.

How do you keep what goes where straight?

posted by Tsu Dho Nimh | on Thu, 2013-04-11 19:30
clips
UlrikeDG's picture

Heat... just in time for

Heat... just in time for spring. :-D

posted by UlrikeDG | on Thu, 2013-04-11 23:09
clips

Radiant heat

We installed radiant in our floors, both upstairs and down. We didn't have to router out as we poured concrete floors over the top but managing all the tubing was NOT easy and making it curve, even harder. Then making sure it holds pressure was nerve wracking. When the guys came and poured the concrete floors and I just prayed they wouldn't pierce the tubing.

All went well and though we are still building so haven't tested it out, EVERYONE I talk to raves about radiant heat so I can't wait to have a toasty house and a warm toilet to sit on;-)

Hannah
38 posted by Bagelpower | on Fri, 2013-04-12 01:37
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birdsandsoap's picture

Phew!

Reading through the heating system posts has been exhausting (and I only had to follow along)! It looks like the most labor-intensive part of this entire building project.

Was it?

All that cutting, building an entire floor on top of a floor, cutting all the aluminum, running miles of hose...then hoping there are no holes- I am so relieved for you!

posted by birdsandsoap | on Sat, 2013-04-20 20:49

I looked up to photos and

I looked up to photos and have a correct idea of doing the same thing which must have sealing pavers first.

posted by hanselmoore | on Tue, 2013-08-20 02:14

That's best

The most common and important advantage of these plates is that they make the distribution of heat through the water is completely smooth. It is more appropriate, where the area to be heated so much more. For this reason, almost all very moderately places to use these kinds of plates.

Paving Hawaii

posted by Joseiesjo30 | on Sat, 2013-12-28 06:48

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