This site is great! I could read these forums all day and never get bored. I want to quit my job.
I have a question.
I have a Morso 5660 installed with my fireplace face reworked. I printed off the manufacturer's installation manual months ago. At that time, the hearth width requirement was 18 inches in front of the door with no instructions about fire resistance.
I have not yet completed the hearth because of other priorities for this reno we just did.
Now, I rechecked with Morso on line and the installation requirements have changed and become much more stringent and detailed. If the bottom of the door glass is 12.5 inches or higher, the hearth must extend 25 inches in front of the door. The hearth material must be 1.5 inches thick with a K-value of 0.84 (BTU/IN FT2 HR F).
My hearth is solid concrete for 10 inches out then hardwood floor. I can remove the hardwood and subfloor down to the joists to rebuild the hearth with a plan for a tile surface. I have read about Micore and cement board from other posts but have a few questions.
1- If I need 1.5 inches of fiber board with a K value of 0.84, is 0.75 inches of fiber board with a K value of 0.43 just as good? This would save some height.
2- How do I calculate the R-value? Do I need to?
3- What is the order of installation? Micore- cement board-tile?
4- Who comes up with these scientific recommendations? I have checked with several fireplace distributors and everyone is mystified by these requirements. Especialy the K factor.
I don't want to burn my house down, but I don't want a hearth that sits 4 inches off the floor when the original intention was to be flush.
I have a question.
I have a Morso 5660 installed with my fireplace face reworked. I printed off the manufacturer's installation manual months ago. At that time, the hearth width requirement was 18 inches in front of the door with no instructions about fire resistance.
I have not yet completed the hearth because of other priorities for this reno we just did.
Now, I rechecked with Morso on line and the installation requirements have changed and become much more stringent and detailed. If the bottom of the door glass is 12.5 inches or higher, the hearth must extend 25 inches in front of the door. The hearth material must be 1.5 inches thick with a K-value of 0.84 (BTU/IN FT2 HR F).
My hearth is solid concrete for 10 inches out then hardwood floor. I can remove the hardwood and subfloor down to the joists to rebuild the hearth with a plan for a tile surface. I have read about Micore and cement board from other posts but have a few questions.
1- If I need 1.5 inches of fiber board with a K value of 0.84, is 0.75 inches of fiber board with a K value of 0.43 just as good? This would save some height.
2- How do I calculate the R-value? Do I need to?
3- What is the order of installation? Micore- cement board-tile?
4- Who comes up with these scientific recommendations? I have checked with several fireplace distributors and everyone is mystified by these requirements. Especialy the K factor.
I don't want to burn my house down, but I don't want a hearth that sits 4 inches off the floor when the original intention was to be flush.