I got an inspection on a dry chemical fire suppression system in a paint booth. My work passed w/o a problem.
The building inspector required 2 layers of 5/8 sheet rock installed on the roof trusses. The rock is facing the exhaust and intake ducts. There is also 2 layers on the inside of the metal roof. There is a thin layer of plastic faced insulation between the sheet rock and the metal roof. Unfortunatly, there is not 18" of clearance between the sheet rock and the duct.
The inspector is now requiring insulation wrapped around the duct. Except he does not know what/where the code requiring the sheet rock or insulation is, nor can he tell the owner what the specs are for the insulation. The BO did give the owner a copy of page 12, but page 12 is not from the 2010 Oregon Mechanical Specialty Code or the 2010 Oregon Fire Code.
from page 12
"(i) Protect exhaust ducts against mechanical damage and maintain a clearance of at least 18 inches from unprotected combustable construction or other combustable material.
(ii) If combustable contruction is provided with the following protection applied to all surfaces within 18" of the exhaust duct, clearances may be reduced to the distances indicated:
(a) 28 gage sheet metal on 1/4" insulating millboard..........12 inches
(b) 28 gage sheet metal on 1/8 inch rookwool insulating millboard spaced out 1 inch on non-combustable spacers.... 9 inches
© 22 gage sheet metal on 1 inch rockwooll bats reinforced with wire mesh or the equivalent.....3 inches
I think I upset the BO last week when I set up the appointment for the inspection. I asked what his qualification were to inspect the booth. He told me that he was certified. Today he asked the State FM where the smoke detectors were in the booth. I knew I forgot something.
Are the requirements for the sheet rock, clearnances and insulation found any place in the IMC or NFPA? Does any one know where page 12 came from?
The building inspector required 2 layers of 5/8 sheet rock installed on the roof trusses. The rock is facing the exhaust and intake ducts. There is also 2 layers on the inside of the metal roof. There is a thin layer of plastic faced insulation between the sheet rock and the metal roof. Unfortunatly, there is not 18" of clearance between the sheet rock and the duct.
The inspector is now requiring insulation wrapped around the duct. Except he does not know what/where the code requiring the sheet rock or insulation is, nor can he tell the owner what the specs are for the insulation. The BO did give the owner a copy of page 12, but page 12 is not from the 2010 Oregon Mechanical Specialty Code or the 2010 Oregon Fire Code.
from page 12
"(i) Protect exhaust ducts against mechanical damage and maintain a clearance of at least 18 inches from unprotected combustable construction or other combustable material.
(ii) If combustable contruction is provided with the following protection applied to all surfaces within 18" of the exhaust duct, clearances may be reduced to the distances indicated:
(a) 28 gage sheet metal on 1/4" insulating millboard..........12 inches
(b) 28 gage sheet metal on 1/8 inch rookwool insulating millboard spaced out 1 inch on non-combustable spacers.... 9 inches
© 22 gage sheet metal on 1 inch rockwooll bats reinforced with wire mesh or the equivalent.....3 inches
I think I upset the BO last week when I set up the appointment for the inspection. I asked what his qualification were to inspect the booth. He told me that he was certified. Today he asked the State FM where the smoke detectors were in the booth. I knew I forgot something.
Are the requirements for the sheet rock, clearnances and insulation found any place in the IMC or NFPA? Does any one know where page 12 came from?
