Open Cell Sprayed Roof Insulation Against Masonry Chimney

[jar546]

What are your thoughts on this? This is an absolute violation in my opinion. The framing was existing, the new foam insulation against the roof deck and masonry chimney are new.

 

[steveray]

100% agree....I don't generally chase the "existing violation" of the framing as I have seen it thousands of times and only twice (during our October storm with no power for 2 weeks) was it a problem with people running their fireplaces flat out for days on end and fires starting...

 

[jar546]

There is more to the story. There is a ceiling in this single family home that will not have 1/2" gypsum board and instead will use wood T&G as a finish. Is this compliant with R316.4?

 

[Wooly]

Is the flue listed for direct contact? I doubt it. Should always have an air gap of some sort. I have been on too many fire jobs where the builder said "but the insulation was non combustible!" And they were right, the insulation didn't burn

 

[jar546]

Is the flue listed for direct contact?

I doubt it but the contractor will have to find out and report it.

 

[steveray]

There are a couple exceptions and I guess they could possibly line it...

R1003.18​

Any portion of a masonry chimney located in the interior of the building or within the exterior wall of the building shall have a minimum airspace clearance to combustibles of 2 inches (51 mm). Chimneys located entirely outside the exterior walls of the building, including chimneys that pass through the soffit or cornice, shall have a minimum airspace clearance of 1 inch (25 mm). The airspace shall not be filled, except to provide fire blocking in accordance with Section R1003.19.

Exceptions:

1. 1.Masonry chimneys equipped with a chimney lining system listed and labeled for use in chimneys in contact with combustibles in accordance with UL 1777 and installed in accordance with the manufacturer’s instructions are permitted to have combustible material in contact with their exterior surfaces.

 

[jar546]

There are a couple exceptions and I guess they could possibly line it...

R1003.18​

Any portion of a masonry chimney located in the interior of the building or within the exterior wall of the building shall have a minimum airspace clearance to combustibles of 2 inches (51 mm). Chimneys located entirely outside the exterior walls of the building, including chimneys that pass through the soffit or cornice, shall have a minimum airspace clearance of 1 inch (25 mm). The airspace shall not be filled, except to provide fire blocking in accordance with Section R1003.19.

Exceptions:

1. 1.Masonry chimneys equipped with a chimney lining system listed and labeled for use in chimneys in contact with combustibles in accordance with UL 1777 and installed in accordance with the manufacturer’s instructions are permitted to have combustible material in contact with their exterior surfaces.

Yes, agree. Waiting on the contractor to prove whether or not the exception applies. There is nothing visible that would lead me to believe it is lined with anything other than a typical flue from the 1960's.