- Q.When installing a
zero-clearance metal fireplace, are there any
requirements for fire stops or draft stops? Does the
inside of the chase need to be drywalled?
mason and venting system specialist, responds:
If there is one situation where you need to follow
the manufacturer’s installation
instructions, it is with metal fireplaces. They are
sold as a system, with brand-specific chimneys. The
components required will vary from manufacturer to
When the chimney is enclosed in a chase, some
manufacturers require that the chase be equipped
with two vents, one at the floor level and one near
the ceiling, to help dissipate heat inside the
chase. You need to install firestops at floor
penetrations, where specified. Because the outside
diameters of metal chimneys vary, the firestops are
manufactured components specific to the type of
fireplace you are installing.
Although each system varies, in many cases the
installation instructions will specify requirements
for wall bands to support the chimney and attic
insulation shields, where applicable. Instructions
should include a chart for calculating lateral
distances when installing offsets and offset
supports in the chimney.
Get a copy of the installation instructions
before you start. This will give you the required
clearances for the system, as well as information
on what accessory components to order.