Zone 5/6a Vinyl Residing – Double Blueboard, Wrap?
Dow SIS is not available in this area, so we will insulate the walls as they are:
kraft faced fiberglass insulation (very, very thin)
two 1/2″ layers of fiberboard as sheathing
one 1/2″ layer of blueboard
My thought is to dense pack cellulose in the walls, tape the existing blueboard, add a second 1/2″ layer of taped blueboard, possibly wrap, then side.
Once concern is the age of the fiberboard – the home was built in 1960. Will it last for the life of the vinyl siding?
Does it make sense to tape the existing blueboard?
Any problems adding a second layer? This will add 1/2″ to the exterior. Trim will be redone at the same time.
To wrap or not to wrap?
Many thanks in advance.
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