floor heating in our attic

As you might already know the Austrian climate requires some serious heating systems for the long and cold winternights (and days). As a matter of prudence we thermally insulated our house (almost) from head to toe to cut down our energy costs and to be able to keep up with the high standards regarding thermal insulation in renovations in Austria.
For our attic we chose a floor heating system we saw for the first time at the fair visiting the Wolf Bavaria booth.

Its a slim and  lightweight solution, which is perfect for our timber construction floor. And it was supereasy to work with.
Let me show you what we did:

With all the materials you get a detailed plan from Wolf Bavaria telling you exactly where to start (red mark) and which of the panels need some cutting (green dots). The yellow panels are “blind” ones (without heating supply) to support our nursery wall.
The panels are made of cardboard with solid aluminium surface and slots for the tubes. For more detailed information visit the slimline website.
Againa, we had a lot of helping hands on the construction site this time. Ray gave us a helping hand as well as Schurl, my dad and Martin’s coworker who is also called Martin. Welcome on board/back and thanks for the help guys!
Surprise guest of the day was my dear friend Uli who didn’t came empty handed. She brought a beautiful basket filled with all sorts of delicious stuff she made/harvested from her appletrees! (look at the size of the apples! incredible!) such great and healthy on site catering! Thank you!

And while the ladies had a little chat downstairs the boys continued to work on the floor heating. You can work rather fast with this system the only thing that took a little more time was: placing and installing the floor sockets. But as the panels are easy to adjust and cut we had no problem in placing the sockets.
The crew worked their way through the room and following the provided plan. They cut the panels with a jigsaw and filed the edges a little to avoid injuries of the tube with the rather sharp edges.
The walls (for the nursery and a little storage room) are going to stand on solid panels also provided with the whole floor-heating package. They are the same height and width as the heating panels which again makes the system work perfectly!
After a few hours we had all 50 square meters covered and the next day my dad, Martin and I installed the heating tubes.
…Acutually, they installed the tubes and I covered the splice with some fancy looking alu-tape. (guess what I’ll use for wrapping the xmas presents this year… just kidding!)

Looking forward to some warm feet this winter!


floor heating – part 2

After lunch we thought it was about time to install the tubes.
Our plumber supplied us with all the materials and he also left a little helpful machine with us .. It works like a big stapler and you can easily avoid blisters from pinning the clips by hand into the styrofoam. (we needed almost 1100 clips for 450 meters of tube… that would have been a lot of nasty blisters on our fingers!)
We started at our “water-distributor-box”. That’s where the warm water (red cap) flows into the tube and returns back (blue cap) into the circular flow. It heats up again and get back into the next circular…
One circular of your floor heating system consists of one long piece of tube which lays in a big circle on the floor…. more or less. you’ll find some better explainations here.
Martin also demonstrated what you mustn’t do!
Kinks and sharp bends are a NO-GO within your floor heating systems! If that happens you need to cut the tube and leave it so that your plumber can set a joint!
The stapler in action..
It worked best for us as a team of three.
One is “stapler-man” and pins the clips into the boards. one just holds the tube in postion. and one is the spool-guy who holds the tube reel and unwinds it with every twist.
…The forth person can take some stunning pictures of installing a floor heating system! 
My Dad helped us as spool-guy and stapler-man!

For our futre staircase we left some space without tubes – so that we don’t get in trouble with mounting the stairs properly onto the floor.

Please note: we just layed the tubes. All the important installation work of setting joints and putting together the different circular flows was done by our plumber!


floor heating – part 1

A few days ago we started with the installation of our floor heating system. It’s going to be a under-floor heating system, where warm water flows through tubes under the screed and heats up the floor.
As simple as that.
We started in the early morning with our very special site-guest Gustav.
Martin and I had to insert a night shift the evening before. We’ve already unroled a polythene seperating membrane on the insulating levelling floor.
On this insulating fill floor (the grey stuff in the photo above), which is basically just shredded polystyrene recycle with some compound cement (this was also applied from our screed-contractor) we layed the green seperating membrane and sealed it with duct tape (=night shift work we did already).
After that we installed the foam strip which will separate the wall from the screed. This must be done pretty meticulously (a job for Martin Monk!), you don’t want any leakage with this step because the screed will find it’s way in your fill floor!
Codo and Schorsch where already there to give us a hand with that.
After that a second layer of insulating styrofoam-boards was installed. It got a grid printed on so you can lay your heating tubes easily within the same distance. Just make sure the grid-pattern continues more or less from board to board.
Again. Seal it meticulously!

To recap:
here is a rough draft of our floor structure with all the different layers:


Before we started with the real fun my friend Kari droped by and supported us with two additional helping hands and some cold drinks and homemade Tiramisu (the best you’ve ever tasted!).
mmmmmh! Thank you Kari! ♥
more to come in the next post. stay tuned.