Mason-Lite Masonry Firebox - Supporting Floor Systems

16
Supporting Floor Systems
It is the ultimate responsibility of the installer to ensure that
proper concrete slab supports are used.
WARNING to the licensed design professional and/or building
contractor: It is your responsibility to be certain that the
Mason-Lite can be properly supported by the combustible
oor system on which the replace will rest.
For replace support foundations installed on concrete refer
to Appendix I and II (pages 31 & 32) for specic instructions.
Rebar locations
Lay-out the position of the replace and drill holes where
the rebar will be located. Secure the #3 rebar 4 inches into
the concrete foundation with ITW Epoxy or Simpson Epoxy.
Follow manufacturer’s instructions for installation of rebar into
slab.
Wood Floor
Anchorage of replace to wood oor construction is required.
Refer to Figure 21 for anchorage dimensions. Four anchors
are required to attach to the sub-ooring framing.
Crawl Space or Upper Floor:
For installation of rebox over combustible crawl spaces or
upper oors, anchorage of the rebox is required. Illustrations
of examples of possible anchorage methods are shown in
Figures 18 thru 20 depending upon the type of oor framing.
Final method of anchorage is to be determined by licensed
design professional.
For conventional framing, where the oor joists are parallel
with the sides of the rebox, the addition of oor joists to align
with the anchor brackets allows the brackets to be directly
connected to the oor joists.
Note that additional oor joists may be required to support
the weight of the rebox and chimney. Where the oor joists
run parallel to the front of the rebox, anchorage can be
accomplished in like manner as shown in Figure 18 using
blocking between the oor joist.
For oors supported by I-Joists, the method of anchorage
is illustrated in Figures 19 and 20. Figure 23 illustrates the
general arrangement of anchorage to oor 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 oor framing.
Additional oor joists or I-joists may be required as determined
by the licensed design professional.
The dead weights for the replace are noted in Table I. 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 replace
installation.
As stated above, it is desirable to place additional framing
for alignment of anchor rods. Refer to Figure 21 for anchor rod
locations.
Attach the rebox side wall anchors to steel support frame
by inserting all-thread rods through holes on the bottom ange
on the steel support frame as shown in Figure 24 and 25.
Secure with two Ø 2” o.d. x Ø 9/16” i.d. x 0.10” Washers and
two 1/2”-13 UNC Nuts.
Figure 18
Floor Sheathing
not shown for
clarity
Metal Base
Assembly
EXAMPLE ONLY
2X FLOOR JOIST
2X FLOOR JOIST
A35 Brackets
(16 required)
I-JOISTS
Anchor
Brackets
Figure 20
I-Joist
Anchoring
Bottom
View
Example Only
I-Joist
Simpson
Strong-Tie
A-35 or
equivalent
Figure 19
I-Joist Anchoring
Top View
Example Only