Mansfield Hearth requirments Vs.other hearthstone stoves

[wendar]

I am wondering why the Mansfield has a non combustible floor pad requirement and all the other hearthstones need so much more .We have been told that ours being cement board (not sure if durock ect) tile is enough .But the heat we get from the underside is extreme and even under the floor in our crawlspace .and we haven't even cranked it yet .....
So why s it that the Mansfield requires no r value while the rest do???and should I be concerned .....I think I would feel better havng more protection ??thanks for your answers ....Confusing thing???

 

[DanCorcoran]

My Shelburne has a heat shield underneath. I can put my hand on the floor beneath the stove and it's not very hot at all. If I try to touch the hearth 6" in front of the stove, I'll get burned. The heat on mine evidently radiates out from the front glass and cast iron of the stove. Same way from the sides. The heat radiates to the sides, but not from the back because I have a rear heat shield and blower. See if you can find a heat shield on your Mansfield.

 

[wendar]

Thanks ,
From what I understand ,they don't make one for that model of stove ,we have the heat shield but the underside gets to be so hot and can feel it underneath floor in in the crawl space .they tell me its safe as is ..bt am having a tuff time with it all..No r protection required and we have some cement board (not sure if its durorock)but seems as it doesnt need any.....strange i think ...
anyways deciding if I can handle it as is or ,may have to get another pad ,just to feel safe .... ??

 

[DanCorcoran]

Under the circumstances, why not get a piece of rigid insulating material which will fit under the stove, but without putting it underneath the legs (so you don't need to raise the stove). Then put a few metal spacers underneath the insulating material to create airspace between it and the cement board. That should get you a much higher "r" value than you have now.

I hope someone with more experience than I have will jump in and say whether this would help...

 

[wendar]

Thanks Dan ..definatly something to think about ..Maybe someone else has one and has had the same thing happen,,,Apparently and I just found this out ,Is that there old manual called for 1.0 hearth protectiion ..so my Question is what did they do to change the stove to make it only need non combustionable hearth pad now ...

I was wondering how a blower would be ?as it would give both more heat pushing out while keeping things from getting to hot ....2 in1???but more r value sounds like a good plan ....Would love to hear from others who have this stove if they have had the same issues or other....thanks Zooter

 

[wendar]

Hoping for some more input from those who have the knowledge .....i have heard much about Micore and am thinking it would be awesome to get the R value I would like ,though am told not needed...Still am not sold on the amount of heat transfer from under the stove to the floor..regardless I cannot find any in our area So someone has mentioned a product called NRG GREENBOARD and it looks good but can't seem to find what the R value is per different thicknesses .Has Anyone heard of it and know the R values?????Thanks Zooter

 

[heatwise]

we have our pad oversized for the phoenix and it does heat up . its 48'' W and 55'' L or so. pete

 

[wendar]

Thanks for the reply
Do you get concerned ??Yours needs 1.00 r value seems crazy because the mansfield is a bigger model and just says non combustible flooring and I have talked to Hearthstone and there distrubuters and told them I think thats insane the amount of heat for having that ..We did make a heat shield of 20 gauge galvinized metal and its working but as you know not alot of room under there...but am finding now the underside of stove is really hot as is the ash pan ...Will it over heat?? and the cast is hotter now.....The heat shield has no heat on it so must be reflecting it back up and out the sides ....

I found info on the( nrg green board) which says *Oh I'm Impressed * and found at the local Timber mart (Maglios building center and is a new product...

as I looked all day The R values on this stuff are incredible ....
40mm 1.04 60mm 1.56 75 mm1.95 100mm 2.60 here is the website if interested (broken link removed to http://nrggreenboard.com/NRG_Greenboard_Technical_Specification_Booklet_Version_6.pdf)
I would be keen to hear more of your stove and how it is working at high heat times Thank you Zooter

 

[struggle]

AS for insulating the floor I do not know. But I can say this ours sets on a concrete ceramic tiled floor and the floor after burnign 24-7 can get so hot that you cannot stand on it in front of the stove for any lenght in time so I think your concern is valid that you might need to add something for in front of the stove. On the sides it is not as bad but right in front man is it hot

 

[Highbeam]

So did you read in the manual that no hearth R-value is required? Or was it what the installer told you? Seems that some of the installers out there will ignore the manual. If the manual requires nothing but ember protection then just run your stove. Forget about it. There is a fire in a box so the ground under the box will heat up.

 

[dwaynecornhauler]

If installed in an alcove at reduced clearances
with NFPA 211 wall protection, the area in front of the
unit must have an additional insulative R-value of .8, or a
listed floor protection must be used.

Maybe .8 is the least you need for not positioning in an alcove.

 

[johnstra]

The way I read the manual, .8 R-value is needed for the Mansfield. I think it's 1.2 for my Heritage.
-john

 

[Highbeam]

I just read the mansfield manual and only in an alcove is the R of 0.8 required. Otherwise, ember protection only.

Many (most even) stoves require nothing more than ember protection. Some goofballs like the heritage require significant R value in the hearth.