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Hearth Pad Requirement
A non-combustible hearth protector with a thermal insulation rating of R-1 is required when installing this fireplace directly on
the floor and must extend a minimum of 12" in front of this fireplace.
For every 1" the fireplace is raised off the floor, the depth of the required R-1 hearth protector may be
reduced by 2". If the fireplace is raised off the floor 6" or more, no R-1 hearth protector is required for fire
protection.
Raising the fireplace only removes the requirement for a R-1 rated hearth protector. The floor in front of
the fireplace will still get hot up to 200 °F. The higher the fireplace is raised the lower the temperatures on
the floor will be. Materials used on the floor in front of the fireplace must be appropriate for elevated
temperatures.
Flooring materials such as carpet, vinyl and laminated floors may warp or be damaged if installed in front of
this fireplace. If these materials are used it is recommended that the fireplace is raised at least 12" above
the floor.
Mendota does not guarantee any materials used around the fireplace. Mendota disclaims any and all
liability for any damage to finishing materials including warping, discoloring, cracking, peeling or flaking.
This also includes any off-gassing or unpleasant smells from materials when they are heated.
3.2.4.2.1
Hearth Pad Materials
A hearth pad with an R-Value of at least 1 is required unless the fireplace is raised off the floor 6" or more. A list of common
finishing materials and their R-Values is included in the "R-Values of Common Finishing Materials" section of this manual. Many
finishing materials have a low R-Value. For example, 1" thick granite has a R-Value of only .05. When building a conforming
hearth pad it may be necessary to use an insulating underlayment board with a high R-Value. A list of some possible
underlayment boards is given below. These boards are not structural they can be easily dented and damaged. They must only
be used as an insulator under other non-combustible finishing material.
The fireplace can sit on a wood or cement floor. An R-1 rating is not required under the fireplace.
Material
Mineral Fiber Board ( Micore 160, 300, SB)
Cearmic Board (Rescor 360)
Cearmic Board (Fiberfrax Duraboard LD)
85-03-01115
R-Values of Hearth Pad Boards
Thickness
R-Value
1/2"
1.27 – 1.47
1/2"
1.11
1/2"
1.10
DXV35 TIMBERFIRE
Application
Hearth Pad Insulator
Hearth Pad Insulator
Hearth Pad Insulator
Page 23
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