Marco B36CF - Fireplace Flush with Wall; Hearth Extension; Common Materials and Their Factors

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The l~arh extemicn must be made 50m a non-sombesrible
Lf there Is a comli~~iblr floor conshuclion in front of 'be
inorgz& mattid w?& a therrn~l ccadizc5vity, IC, of .8$ &
f~eplzce, you are required te protect it with a 11earJi extm-
less. Tne thermal cmduc=ivky, K, nr thermal rcistance, R
cfmaterids c~?csually he obrsined 50- tbernmdacturer.
sion. Th: hezrth exmion, as shown in Fipre 56, must be
a minimum of 16" deep by 46" wide, and extend a rniair~ln
Thefzetors aerelaud by thtfomulsK= 1/8. thickness
ef 3" beyond eacli side of the fireplace o~ening.
reqired fcr vzdeus cornmonmab,ials &id their factors zs
sllown in 5gtlre 37.
HEARTH
EnEHSION
HE-36 (3PC.j
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!
NAILING
1U.S. ~hsurn Cap. 1 , -' 1 -1
WCOXE CVvO .43 52"
---
Jnst:Iadng Baud
(TC-F.4C 1 D) .n .91"
Lydall. LIC,
LYTW 140L -76"
SLrrnrLrd Oil
3LWOm