I-J
OIS
TS
Installing the Gas Fireplace
Anchorage of fireplace to wood floor construction is required.
Refer to Fig. 9-2 for anchorage locations. Four anchors are
required to attach to the sub-flooring framing.
Crawl Space or Upper Floor:
Fig. 10-1
I-Joist
Anchoring
bottom view
Anchor
Example only
brackets
For installation of firebox over combustible crawl spaces or
upper floors, anchorage of the firebox is required. Illustrations
of examples of possible anchorage methods are shown in Fig.
9-2 thru 10-2 depending upon the type of floor framing. Final
method of anchorage to be determined by licensed design
professional.
For conventional framing where the floor joists are parallel
with the sides of the firebox, the addition of floor joists to align
with the anchor brackets allows the brackets to be directly
connected to the floor joists. Note that additional floor joists
may be required to support the weight of the firebox and
Fig. 10-2 Typical anchorage layout
48-3/4
”
2
” min
Fireplace
chimney. Where the floor joists run parallel to the front of the
firebox, anchorage can be accomplished in like manner as
shown in Fig. 10-1 using blocking between the floor joist.
For floors supported by I-Joists, the method of anchorage is
illustrated in Fig. 9-3 and 10-1. Fig. 10-2 illustrates the general
arrangement of anchorage to floor framing.
It is important to take into consideration that the load for the
Mason-Lite Fireplace must be considered as additional dead
load that will have to be supported by the floor framing.
Additional floor joists or I-joists may be required as determined by
the licensed design professional.
The weights are noted in Table I for each MASON-LITE
unit model. It is the task and responsibility of the general
contractor/installer to see that the proper reinforcement for
weight loads are made by a licensed design professional
prior to the fireplace installation.
As stated above, it is desirable to place additional framing for
alignment of anchor rods. Refer to Fig. 10-2 for anchor rod
dimensions.
Attach the firebox side wall anchors to steel support frame by
inserting all-thread rods through holes on the bottom
flange on the steel support frame as shown in Fig. 10-2.
Secure with two Ø 2
” o.d. x Ø 9/16” i.d. x 0.10” Washers and
two 1/2-13 UNC Nuts.
MASON-LITE Weight Determination
The following are dead load weight estimates for the
Mason-Lite
™ Fireplace.
Table I
MFPST43
Fireplace
845 lbs.
clearance
outline
Damper/Anchor
Plate, Firebrick &
350 lbs.
12
”
Mortar
Floor Area
53
” x 28”
(10.3 ft²)
Other Weight Considerations:
1) Fireplace finished facing
(surround): This information
needs to be obtained from the contractor.
Example only
2) Weight of metal flue: See chimney manufacturer
’s weight
specifications. Some chimney systems can weigh up to
50 lbs per lineal foot.
Note that MASON-LITE cannot accept responsibility for
structural floor support details. All drawings are presented as
mere illustrations to indicate the presence of the underlying
SECTION VIEW
floor system. It is the responsibility of the general contractor/
ROTATED 90CW
installer to consult with a local licensed design professional
for guidance in building a proper floor support system.
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