last modified: July 8, 1996

Install ceiling slabs. Use a helper, and set up adequate staging (foot planks). Be careful handling them, as the insulating board is fragile.	Install ceiling slab extension piece by siliconing in place. Using GE clear silicone, carefully seal all ceiling slab joints, particularly the shiplap joint between the two slab halves. If gap between slab and top of side channels is greater than 3/16", stuff with ceramic fiber first. Next, check firebricks for full joints. Next, check side channel gaskets and use silicone to tighten where needed.
Next comes a double wrap of fiberglass matt to act as an expansion and slip joint. Quickly dab silicone approximately 4" - 6" o.c. over entire area indicated. Start at top of ceiling slab and go 38" down. Carefully unfold fiberglass mat and, with a helper, wrap around heater. Make sure mat goes all the way to top of ceiling slab. Have helper hold in ends in place, and go around heater, patting the mat onto the silicone. The mat is somewhat fragile. Trim to give approx. 4" overlap, and secure end with silicone dabs and several 3" pieces of duct tape.	Second wrap of fiberglass mat starts at top of first channel and goes 38" up. Use same procedure as before. Trim around firebox and use offcuts to cover exposed firebricks at front.
Add two additional pieces as shown.	Note location of firebrick split heat shields.