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HiRTH CONSTRUCTION
The hearth will need some insulating qualities. In Australia the minimum requirement
is a 5mm fibre cement sheet placed directly on the floor. If there is no intention of
lifting and moving the hearth, it is usually fastened directly to the floor. In New
Zealand, the insulation can be provided by two layers of MICORE 160 (each 16mm
thick), or one layer of WOODTEX (35mm thick), and both these materials give
adequate protection for solid timber or particle board flooring. In both countries, a
durable top surface will be needed to resist damage from dropped embers. Obvious
choices are slate, bricks and ceramic tiles. Gaps between the pieces of the top surfacing
material should be grouted to prevent embers from penetrating. A trim moulding can be
fitted around the edges to provide a neat finish.
Constructions which are NOT suitable as insulating hearths are bricks and concrete
when they are in contact with the flooring material.
(ceramic tiles)
Australia - One sheet 5mm Fibre Cement
New Zealand - Two sheets of MICORE 160 or
One sheet of WOODTEX (35 thick) or
Two sheets of ROCBOARD (each 15 thick).
Trim Moulding
INSTALLING THE FLUE
You MUST use a flue system which is approved by MASPORT and which complies
with AS 2918 - 1990 or NZS - 7421 1990 as appropriate. The flues and flue heat shields
recommended in Australia are detailed in the table on page 5. In Australia, flue heat
shielding must be fitted unless all heat sensitive material is at least 450mm away from
the flue surface.
In New Zealand we recommend the use of genuine Masport flue kits. The flue MUST
be installed in accordance with the detailed instructions accompanying it. A polished
180° stainless steel heat deflector, 1200mm long, (Part No 551337) must be fitted at the
back of the flue, directly above the stove, unless all heat sensitive material nearby is
separated from the woodfire by at least the distances shown in the right hand half of the
table on page 6.
In New Zealand, all Masport LE models must have a cap fitted at the top of the flue
heat deflector to control ceiling temperatures. This cap is an integral part of Masport
Flue Heat Deflector Part No 551337. If an earlier Masport Flue Heat Deflector (Part No
584665) is used, it must be fitted with a separate cap, Part No 584842.
FIXING THE WOODFIRE IN POSITION
Once the flue shielding system has been installed through the ceiling and roof, the
woodfire can be placed in its approximate position on the hearth, and the flue pipes
installed. Finally adjust the stove position making sure the flue is vertical and that the
necessary minimum woodfire-to-wall distances are being achieved. In New Zealand,
NZS 7421 requires that the woodfire and hearth be secured to prevent shifting in the
event of an earthquake. With the style of insulating hearth suggested, this is best done
by fastening the woodfire right through the hearth to the floor, using at least two 10
gauge screws or the equivalent sizes of coach bolts or spring toggle fasteners. Use the
two holes in the outwardly facing flange of the rear pedestal panel unless a fan is to be
fitted. In that case, use the two holes inside the pedestal at the rear.
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