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Posted by Leon Baker on July 17, 2006, 5:12 pm
you want the easy mat http://www.custombuildingproducts.com/welcome.aspx
> 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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