My ex is about to put some flooring down over existing wood floorboards, reason being cold rises from the cellar underneath (not habitable, low ceiling). Will be in the hall and small front room. Small house.
She's thinking tiles in hallway and wood flooring in front room, or wood in both.
What kinds of wood are reliable with underfloor heating? Is it only engineered wood squares, or are there some other clever options?
Experiences and advice, including wood and tile options?
Tiles of course are fine.
Some engineered wood flooring is fine - but check the manufacturer's
instructions. You might look at kahrs website - they do have detailed
instructions and a technical line you can phone.
tack down hardboard to kill draughts. Makes a huge difference
Then you will need to put better than old floorboards and hardboard -
suggest ripping up and using 3/4" ply or chip
Wood as in laminate?
Whoa - where did UFH come from?
If you are doing UFH and not using leccy mats then you need to start
from scratch and do the whole thing right.
The easy part. laminate is OK with UFH as is engineered wood but real
boards may well shrink a lot in winter.
IF this is a suspended ground floor, you MUST shove in as much
absolutely draughtproof insulation as you can, otherwise the UFH will
heat the underfloor space as well as the house.
That means (unless you have crawl space under the house) ripping up all
the floors and starting again.
If you can access from underneath, wedge 75mm kingspan or similar
between joists flush with base and foil tape over bottom.
If you cant access from below, screw little L shaped hangers to the
joists, and pop the insulation on that, and then go round the edges
with a mastic (decorators caulk works and is cheap) to completely seal
Put a piece of insulation along any outer walls as well, under the floor
You can then use pipe clips pushed into that to locate the UFH pipes.
Which you should lay at around 4" spacing in as many parallel circuits
as you need. That will give you about 100W/sq meter at 50C water temp
which is OK for a moderately well insulated house.
Put the pipe inflows at the edges and the outflows near the middle
For tile over, I'd lay 3/4" floor grade chip or ply over all that make
sure its dead flat by using packing over any low joists.. And use a
thick cement bed - at least 6mm - of flexible and quality tile cement.
That's about an inch in total, and if you want to match that with solid
wood that's easy enough with 3/4" boards on a 1/4" packing but beware of
For engineered wood us 3/4" chip flooring, a bit of foam underlay and
1/4" engineered wood. That works pretty well. Remember to leave an
expansion gap at the edge and cover that with skirting.
The main point is that you cant do half a job with wet UFH. You must
lift the lot and insulate properly, and the more insulation the better.
Everything you read in newspapers is absolutely true, except for the
rare story of which you happen to have first-hand knowledge. – Erwin Knoll
Heat does not rise. FACT.
Hot air rises, because it expands and is lighter.
Polyplumbs overlay U/F heating panels have such poor insulating
qualities that conduction into the ground or below-floor space makes it
expensive to run. Even B&Q stopped selling them.
Try googling basic physics.
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