Insulation Protection question

[Trevor M]

Must you use a metal insulation protection device provided by the Big Corps to pass WETT cert. or can you make your own. The one that comes with the kit only about 20" high and I want it to be much higher. in fact I want it to reach the roof (36") (3-12 pitch) so that I can blow in as much insulation as possible. Can I cut the hole in the ceiling and build my own box out of OSB staying 4" away from the Class A pipe (7" pipe. 11-1/8 OD)

Thanks

 

[begreen]

Got a picture or two or a link to illustrate what this is?

 

[Trevor M]

12" across top. And the bottom is 13 across

 

[begreen]

Got it, looks like an attic insulation shield. It sounds like what you want to build is a chase surrounding the chimney. That should be ok, but the inspector needs to know the inside clearances are proper. Ask the inspector how to proceed. He may want you to just frame it so that he can check clearances before it is covered. Or he may be satisfied with good pictures that document construction and clearances.