Is it okay to cut the stove boards from tractor supply/Lowes?

[SpAmSoNiTe]

So after doing some research here I am pretty sure that against my father-in-law's insistance, my 3-4 inch thick stone hearth over framing is not gonna cut it for the 1.5 r-value needed for the NC-30, except where the old millboard is at(too far right of where I would like the new one), I'm considering a piece of stove board. Wanted to know if it is possible to cut the imperial brand type 2(I can only find instructions for their type 1 online)? I am sure that this will void the warranty but do you guys think it would affect the actual thermal protection(other than the smaller area)? Don't really wanna do a raised platform if I can get around it.

 

[DanCorcoran]

Mine is Micore. I can't imagine it would affect thermal properties, but I'd wear a dusk mask.

 

[begreen]

Can you post a picture of the full hearth that illustrates the issue? I'm not following why the board needs to be cut.

 

[Grisu]

The problem you may have is the thin metal cover that is on top of the micore. That will leave a sharp edge or you need to pry it off first, cut it separately and then wrap it around the cut micore again. I hope you know that those boards come in different sizes? Also, it does not hurt to exceed the minimum clearances.

 

[Highbeam]

When you take a manufactured hearth pad that was tested and listed to perform a certain thing and then cut it, you lose the listing. It is possible that the manufactured hearth pad was rated for a higher R value than its individual components. You've altered the pad and so you lose the rating.

 

[Grisu]

When you take a manufactured hearth pad that was tested and listed to perform a certain thing and then cut it, you lose the listing. It is possible that the manufactured hearth pad was rated for a higher R value than its individual components. You've altered the pad and so you lose the rating.

Yep, you would probably need to assume it is your own self-made hearth and add up the individual r-values: (broken link removed)
Looking at it, you would probably fall short as I doubt the micore is thicker than 1/2 inch.

 

[stoveguy2esw]

When you take a manufactured hearth pad that was tested and listed to perform a certain thing and then cut it, you lose the listing. It is possible that the manufactured hearth pad was rated for a higher R value than its individual components. You've altered the pad and so you lose the rating.

this is exactly correct, any alteration whether it changes performance or not voids the listing on any UL approved product.

 

[SpAmSoNiTe]

Well, after some careful thought I think I've decided to build a raised platform from 2 1/2" metal studs on at least 8(probably 7)" centers, with two layers of 1/2" durock and tile over it. The reason I was looking to find something I could cut was because the stone hearth(I'll try to snap a pic soon) is 42" x 12ft. long, with same stone behind as an entire wall. It's already raised about 8 inches from the rest of the floor(built on 2x4's, then ply, then the stones). I'm gonna make a removable extension out of similar material to get the 52" in front of the door I need.
This was never a problem because the two previous stoves on the hearth were side loader circulators and there was old school(asbestos) millboard underneath the 3" thick stone. I don't know if either of the old units needed a high R-value underneath them or if my father in law thought the stone would insulate good enough but I have since learned here that that stone provides virtually no R-value..

All in all, a lot of extra work, but I'de rather do it right vs. burning down the house(although on second thought... ).

 

[bobdog2o02]

burning down the house(although on second thought... ).

Not even remotely funny.

https://www.hearth.com/talk/threads/boom-house-burned-down.128097/#post-1725432

 

[SpAmSoNiTe]

Not even remotely funny.

https://www.hearth.com/talk/threads/boom-house-burned-down.128097/#post-1725432

Didn't mean to offend bobdog.. A fire is nothing to scoff at. I have known several people who have had their homes burned to the ground(one girl I went to school with that this happen TWICE!). I was just making a small jest at the state of my 1860's farmhouse, where my frustrations come to fruition when I run into the issue mating modern day construction materials to an old farmhouse where "straight and level" and "on center" didn't seem to matter to the original builders..

 

[SpAmSoNiTe]

Can you post a picture of the full hearth that illustrates the issue? I'm not following why the board needs to be cut.

Here is a (bad) pic of "the stone wall" as we call it for obvious reasons. Ignore the clutter; we just got new furniture and had to get the excercise stuff off the carpet to clean.

 

[ddahlgren]

Thinking outside of the box what about some sort of wrought iron platform under the stove with enough air space so easy to clean under it?

 

[SpAmSoNiTe]

Thinking outside of the box what about some sort of wrought iron platform under the stove with enough air space so easy to clean under it?

ddahgren,
That would def. Look pretty cool but I think it would get a lot more pricey than I wanna do to make it weight bearing enough.