Imperial Ceiling Domes
Install Suggestions for Installing GRG Ceiling Dome
Always use a professional for Installation of
RECEIVING THE PRODUCT:
Treat the segments of the GRG dome with care as they can break if
struck or dropped.
They are re-enforced with fiber and resins and are very
sturdy but can chip.
Pay special attention to the overlap flanges. You can
always patch any parts with plaster. GRG is a non-combustible
Framing within and above a Ceiling Rafter
This type of
installation impacts on the structural integrity of the ceiling rafters or in
modern construction the roof trusses. Cutting out a rafter requires the
advise of a structural engineer. They will instruct
you on how to compensate for the loss of the structure of the ceiling roof
joists that get cut away. For smaller domes, one installs them similar to
that of a skylight. For larger domes, one would involve side wall supports
so that the roof won't split apart. If the rafter is cut you can consider
raising the rafter to be a collar tie with the compensating side wall supports.
Always keep within the building code and take the advise of you own structural
engineer seriously and have the framing inspected by a local building inspector
or certified structural engineer.
Create a wood cage-frame for the dome to sit in. This open
framed box allows the dome to be accessible from all sides. The cage should be
made slightly larger than the dome itself using shims and blocking to do micro
adjustments. The segments of the dome are attached to the frame. For
multipart domes attached one piece then build the dome in segments. At
first use only a few screws (enough to hold the piece) to allow you to micro adjust the position. The
gaps between pieces can be taped and mudded after installation. Once the
dome is positioned do the final screwing to the frame. Some domes come
with exterior hooks, attached chain to these hooks for additional support.
Chains and other integration hardware are included with the domes. Domes
are sold as components.
On the outside of the cage-frame (ie. the
attic side) cover the cage-frame with plywood after the dome is installed. Use
screws not nails in case you ever have to dismantle the box to get to the dome. On the outside of the plywood glue Styrofoam SM to provide approximately 7.5
insulation value. On all seams cover them with red Tuck tape to seal the
vapor barrier. Join up the vapor barrier of the rest of the ceiling to
this new vapor barrier box that surrounds the dome. Over the SM
covered box, cover it with your fiberglass batt or foam spray insulation to join up with the
rest of the attic insulation.
with a Suspended Ceiling
This type of installation
reduces your ceiling height. Although it will not impact on the structural
integrity of the roof truss, it does put weight on certain rafter members that
were not intended to take additional loads. Always get the advise of a
structural engineer before installing. They will instruct you how to
compensate for the increased weight of the dome by adding extra rafters or a
steel support that will reside on the outside support walls. After framing is
complete, create a dropped ceiling beneath the rafters with wood or metal load
bearing studs for the dome to be surrounded by. As the dome is below the vapor
barrier, insulation is not necessary. One can create a framed box for the dome
to sit in or just attach it to the framing.
c) Framing & a Chandelier
The domes are sold as decorative products only and are not load
bearing. Any ceiling fixture must be supported above the dome with the
adequate framing. You can cut a hole in the top of the dome for the
electrical receptacle and fixture attachments fixed to the framing not the dome.
All electrical work should be done prior to installing the dome by a licensed
electrician and inspected.
The geometric shape of all domes acts like a amplifier for sound.
This is the natural order of convex shapes. In order to dampen sound, we
might suggest insulating the backside of the dome with sound insulation.
This creates a thicker medium to absorb sound, although there will always be
THE DOME TO THE FRAMING
Most larger domes are supplied in segments that join together. Usually
they are numbered. Unpack the dome
from the wood create and pay special attention to the number on the segment as
they are to be installed in that sequence. You need to support and position the
initial segment marked piece #1. This is done in two ways. 1) The flanges
are embedded with plywood and are created to take fastening screws. 2) on some
segments have suspension hooks on the outside which will allow a "chain" to be
attached to the framing. Once the initial piece is installed, add the
subsequent pieces. Remember that for the first phase of the install do not put
in too many screws in case you need to micro adjust the placement. Once all
segments are in place, add more screws and more chains to firm up the support.
Use a level on the bottom of the dome to make sure that it is in line with the
drywall around the dome. You might consider using a string line to ensure
a level placement. The ceiling drywall butts up to the edge of the flange
of the dome. There is a small reveal on the face of the flange so you can tape
and mud the dome to create a continuous flow to the ceiling. Always
use an experienced contractor to install domes. Integration products are
not included in dome components.
Optional Light Valences:
They are attached after the dome has been installed. The
advantage of the valence is that it provides a professional finish and upward
indirect lighting. Light
fixtures are not included. We suggest that you purchase low voltage rope lighting or upward mini
flood lights that attach to flexible track. You might also consider a dimmer for these lights.
Remember to have your licensed electrician install the wiring before the dome
and valence are installed. Most electrical code require that junction
boxes are accessible at all times.
FINISHING BY YOUR INSTALLER:
Tape and mud (drywall compound) the reveal of the dome and
valence to the surrounding drywall. Put on your tape then do a skim coat, build up the
plaster and sand between skim coats. Finally, prime the drywall and
the dome. Paint or faux finish with a high quality paint.
The above install notes
are suggestions only. Consult and use a professional before installing
any dome product. Consult
your local building codes before installation.
Consult with a structural
engineer before cutting any load bearing structure.
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Feb 2018 all rights