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Posted by Mulan on July 17, 2006, 4:10 am
2.5" is a lot of height to lose and would mean a step into and out of
the room :-( Do you think the bubble wrap style of foil would have too
much "give" under cement board? That would give me air space?
Or maybe the roll of white polystyrene that you put under wood floors
then the foil on top and then the cement board. Would that thin poly
be enough air? I SO don't want to pull up the tongue and groove.
marson wrote:
> foil works by reflecting radiant heat, and i think it requires an
> airspace to have any value at all. so the answer is that the foil
> would have little value IMO. do you have the room to add a layer of
> rigid? if you did, you could even add a layer of 2" extruded
> polystyrene (dow blue or similar) with a layer of plywood over it.
> expensive, yes, but then pumping heat into a crawlspace isn't exacty
> cheap either. otherwise, i think you are going to regret not tearing up
> the subfloor and insulating between the joists.
>
>
> Mulan wrote:
> > I have a tongue and groove wood floor over a dirt filled crawl space
> > and I don't want to rip up the floor to insulate. I am going to put
> > cement baord down and tile the top with granite using an underfloor
> > heating mat since there's no heat in that part of the house.
> >
> > Can I put some kinds of foil between the wood and the cement board to
> > keep the heat in the house? Any ideas? I have seen 2 kinds of foil one
> > that looks like bubble wrap and another that's like think kitchen foil.
> > I was thinking the bubble wrap would cause too much give and make the
> > tile crack?
> >
> > Would the foil cause any kind of moisture problems that would rot out
> > the wood?
> >
> > Help!
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