hearth build

https://www.hearth.com/econtent/index.php/articles/hearth_design

1/2" of durock board equals .26 R value.

R value is cumulative, so if you require an R value of 1, then you would need 4 layers of 1/2" durock to satisfy the requirement.

As far as I know you cannot count a combustible material like plywood into your total R value, you must meet your stove's requirement using non-combustibles.

According to the instructions the Englander 30 requires minimum of R value of 1.5.

Going by the list on the hearth.com link above, depending on cost comparison you may be better off to find some ceramic board, you would only need 2 layers of 1/2" ceramic vs. 6 layers of 1/2 durock.

Good luck.

FlagshipSweep said:

https://www.hearth.com/econtent/index.php/articles/hearth_design

1/2" of durock board equals .26 R value.

R value is cumulative, so if you require an R value of 1, then you would need 4 layers of 1/2" durock to satisfy the requirement.

As far as I know you cannot count a combustible material like plywood into your total R value, you must meet your stove's requirement using non-combustibles.

According to the instructions the Englander 30 requires minimum of R value of 1.5.

Going by the list on the hearth.com link above, depending on cost comparison you may be better off to find some ceramic board, you would only need 2 layers of 1/2" ceramic vs. 6 layers of 1/2 durock.

Good luck.

Click to expand...

Incorrect, Durock NexGen is R-value of 0.39 per 1/2" as seen here:
http://chimneysweeponline.com/horvalue.htm
The original Durock had R-value of 0.26 per 1/2".
Ray

For my hearth I built a 2x6 stud framed foundation and laid it on the floor, anchoring it to the subfloor (16" centers, just like you would frame a wall) Then I installed cement board on top of that, ran some long 2 1/2" screws into the studs but I let 1" of the screw above the cement board. I then took some expanded metal reinforcing and tack-welded it to all the screws, and built a two inch form all the way around the hearth. Last step was to pour the Sakrete high strength countertop concrete on top of the hearth, and trowel it off. You end up with an ultra strong 2 1/2" hearth to install your tile on, and you will never have to worry about being good for code on ANY woodstove, should you decide to install another model down the road.....they don't call me Overkill for nothing... ;-P Here's a link to some pics of my hearth install. Still waiting for milder weather to finish the interior stone and finish work...... :roll:

https://www.hearth.com/econtent/index.php/forums/viewthread/81873/

Scotty Overkill said:

For my hearth I built a 2x6 stud framed foundation and laid it on the floor, anchoring it to the subfloor (16" centers, just like you would frame a wall) Then I installed cement board on top of that, ran some long 2 1/2" screws into the studs but I let 1" of the screw above the cement board. I then took some expanded metal reinforcing and tack-welded it to all the screws, and built a two inch form all the way around the hearth. Last step was to pour the Sakrete high strength countertop concrete on top of the hearth, and trowel it off. You end up with an ultra strong 2 1/2" hearth to install your tile on, and you will never have to worry about being good for code on ANY woodstove, should you decide to install another model down the road.....they don't call me Overkill for nothing... ;-P

Click to expand...

Unless the new stove requires a larger hearth laterally because it is bigger. I hate when that happens! :lol:

Gary

Gary_602z said:

Unless the new stove requires a larger hearth laterally because it is bigger. I hate when that happens! :lol:

Gary

Click to expand...

Yeah that's something to think about before you build it, good point Gary! I guess the bottom line is you are better off going a little bigger on your hearth just in case you would change stoves down the road. Good point!!