The following are attic furnace installation requirements based on 2009 irc and 2009 imc the codes refer to it as appliances in attics.
Decking under attic furnace.
Verdict on having a furnace in the attic pros and cons.
Not only will it interfere with the efficiency ratings of your equipment but it can also cause damage to your unit that may go undiscovered for some time.
Mcyr marcel cyr cmi july 5 2010 6 18pm 9.
High efficiency furnaces aren t usually recommended for an attic.
Most of the issues that furnace might experience in an attic are due to extremely cold weather in this poorly insulated space.
Attic furnace access passageway and platform.
The pros and cons of placing a furnace in the attic indicate that this idea is not a good one under most circumstances.
Gain access to the attic to inspect the plywood or roof decking.
The decking material can be half inch plywood.
Be sure to cut the ripped pieces to the proper length before taking them up into the attic.
Attic furnace installation must comply with you local mechanical code or imc international mechanical code if such was adopted in your area.
Decking in front of the hvac equipment must be at least 30x30 inches.
The presence of mold inside your home even if it.
If your attic joists won t bear the weight necessary to finish out a living space but the engineer cleared them to support floor decking for light storage you can install inch plywood or.
Look up at the roof area.
I call it out when there is no decking on the passageway.
Attic furnace passageway and service area electrical requirement.
Mold growing on the sheathing in your attic is a serious problem that shouldn t be ignored.
However since very few attics have an opening that s wide enough to pass a full sheet of plywood through the four by eight sheets should be ripped lengthwise.
There must be a passageway at least 30 inches high and 22 inches wide and not more than 20 feet in length.
Does mold on attic sheathing have to be removed.
Locate the rotted roof decking.