Radiant heat improvement?
I have an ongoing renovation of my own house but any info will certainly apply to other projects that fall into this same scenario or possibly another job that I or others may encounter.
The current conditions are:
1. Hydronic radiant heat installed under existing 3/4" board sheathing which is under two layers of wood flooring for half of the area, the second half is tile underway, same build-up thickness.
2. 5 loops cover 925 s.f of first floor area, fairly equally sized loops.
3. The insulation under the loops is 2" polyiso cut to fit between the joists and meticulously foamed in place with a 2" gap between tubing and top of polyios...give or take.
To improve performance:
1. I will eventually remove all wood flooring but will have to build back up to the same thickness but the next version of the wood areas will be rips of (Advantech?) or some other 3/4" material to replace the current full area 3/4" material to allow more heat to transfer and then the final 3/4" hardwood. Currently, the heat moves through pretty good, but not as good as in other installations where it doesn't have to fight so hard...and waste energy.
2. The tile area: This is the tough one. In order to maintain the same floor elevation AND properly install tile, I have full coverage 1/4" fiber rock as a tile underlayment for my tile to flush up with the final 3/4" hardwood. (above 1-1/2" of wood substrate. This weekend I began the floor leveling process and ended up adding about 3/4" of floor leveler to a 10' x 10' area to make the world flat after underlayment. In that area, I noticed a significant difference in the "feel" of the radiant in the areas of fiber rock and leveler....well duh.
So, in the hardwood areas, I can resolve the subfloor issues with providing "slots" in my new underlayment, that's a no brainer. In the tile areas.....I thought about drilling through the entire assembly that will be below the tile (1/2" diameter holes, every 12" or so) to allow the heat to move upwards to the bottom of the tile to allow yhe heat to get to where it belongs...to the room. The are where the leveler is is noticeably cooler than the wood flooring
As a gauge tonight (23 degrees in Portland) I tested how it would react to forcing the loops to raise the temperature quickly. The first floor started at 68 degrees and I set the temperature to 72. After an 1-1/2 hours it was there.
I may be over thinking this (heat recovery was not really that bad) but thought I would put it out there.
Any thoughts are appreciated.
Posted Mon, 03/24/2014 - 21:25
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