Ideally the foil should be closest to your roof deck for the primary defense of blocking radiant heat but it can still work inside the attic after foam the question is how big of a difference it will make.
Attic vapor barrier home depot.
And that is harder to quantify.
If your current insulation is a cellulose product similar to the greenfiber natural insulation your existing 6 is equal to about a r 19.
Get free shipping on qualified vapor barrier insulation insulation accessories or buy online pick up in store today in the building materials department.
Make sure you don t block any ventilation areas.
When installing your batts make sure to fit them tightly end to end as gaps in the insulation can greatly reduce your r value.
Attic insulation and vapor barrier it is not necessary to have a vapor barrier for either greenfiber natural blow in or owens propink blow in insulation except if your local building codes require it.
For an uninsulated attic it s important to install a vapour barrier on the interior side of your roof before filling it with insulation.
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Radiant barrier blocks 97 of radiant heat meaning it stops it from entering the home.