So I'm installing my stove in my workshop and going up through my attic and the attic is unfinished and has no insulation. I have insulation panels as the ceiling. I have a ceiling support for going up to the attic, then Class A Chimney from there....do I need the Attic insulation shield since there is no insulation and there won't be. I'm planning to build a box around the Chimney in the attic since I do use the attic for storage.