Hearth Pad Question

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DV

Feeling the Heat
Feb 6, 2012
264
Southern MD
So I am going to build my own hearth pad for my new pellet stove. Question is would a piece of 3/4 inch plywood with 2 5/8" thick concrete patio pavers installed onto the plywood work? It seems to be plenty thick as far as the specs go.
 
I'm new too but I think you have to figure out if those pavers will conduct heat to the wood below. You need something that won't conduct, like fire rated cement board or some such. There are lots of threads on here about that. Good luck!
 
I used two layers of Wonderboard, it's a fiberglass reinforced cement board. But regular cement board would work too.

Total cost was about $60, a far cry from the $300 they wanted at my local stove shop.

Dave
 
If the patio paver is one solid continuous piece over the whole surface area of the pad, it will work fine if 2 5/8" is greater than what the manufacturer calls for.

However, if you're putting multiple patio stones together, there will inevitably be gaps between them. This is not good if you have plywood underneath.
 
76brian said:
If the patio paver is one solid continuous piece over the whole surface area of the pad, it will work fine if 2 5/8" is greater than what the manufacturer calls for.

However, if you're putting multiple patio stones together, there will inevitably be gaps between them. This is not good if you have plywood underneath.
Good point. My plan was to get all the pavers in place and caulked done with high temp caulk. And then work the polymetric sand into all the cracks and then mist the sand to set it up. Just like i did on my outside patio only on plywood instead of sand. It will be a grout seal between all the pavers so it will be a continous solid piece. I dont want any heat getting down to that plywood.
 
sounds good we usally require that 4" wide 22 gauge steel strips are centered under every joint and then seal them up so that if it ever cracks on the joint it's not just plywood
 
This is an answer I gave a while ago.
My hearth was built for my last stove (An EF-2)
The M55 Cast now sits on it proudly.
I built it 4+ years ago and still looks great.




nailed_nailer said:
I wavered a bit about to tell the town when I built mine.
In the end I'm glad I did.
The Inspector came out....Collected his $25.00 fee. And we talked about the stove for 1/2 an hour.
I think he wanted to buy one when we were done. Great Guy.

Good news was that my insurance company did a "surprise" walk through about a year later. They asked about the stove.
I showed them the Fire inspection sheet and they were happy with that.

In my case I built a hearth that you could change out an engine on. Way overkill.
Still only cost me about $100.00

If you read your manual it will tell you clearance to combustibles.
On most pellet stoves all it says is " under stove must be a non-combustible material" Basically a sheet of tin would meet that requirement.
You can dress it up however you like. Most pellet stove manuals I have seen don't specify an "R" value.

Good Luck,
---Nailer---

This is my post about it way back in 2007


nailed_nailer said:
I just installed my Enviro EF-2 3 weeks ago on a hearth that we built.

Mine is in a corner location and we wanted a pentagon style hearth.

I cut 3/4" plywood to the size I wanted.
I then put a sheet of 24 gauge sheet metal over that.
Then I put a layer of 1/2" of Dura-Rock over that.
All of this was screwed to the existing floor.
Next we layed out a design in 4"X8" paving stones for a border.
Then we filled the border in with 6"x6" paving stones set in a running bond pattern from the front center.
The pave stones were buttered in with thin set.
For grout I used Polymeric sand http://www.groundtradesxchange.com/pavers/polymeric_sand.htm.
It hardens with water.
I didn't want to use regular grout due to the pave stones being so rough surfaced that I thought the grout would be hard to wash off the faces.

I then wrapped the hearth face in 3" of red oak trim.

We like it.
So far the sand has not moved. Even when vacuumed.

I built the pad about the same as you are describing.

Depending on your stove....all you may really need is a non-combustible material of sufficient dimensions.
That could be a sheet of tin.
Your stove manual will have what is required under it. Most pellet stove don't need much.
As always follow local codes.

Good Luck,
---Nailer---
 
maybe use hardy board instead of plywood? ive seen people pour their own concrete pads using dye to color the concrete. i have a plain black wood stove matt that i bought at farm and fleet for $40. matches the black stove.
 
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