I have study that the usage of rock wool is typical in Canada and Europe, where it is typically mounted on the exterior side of your drinking water-resistant barrier (WRB). Additionally it is utilized as batt insulation and in some cases being a blown-in product within just masonry veneer air spaces.
However I am able to’t visualize corporation like roxwool with all their income and exploration would endorse something which would create a problem. But who is aware of ?!? I’ll Speak to their science Division and report again right here .
They must have similar R values for a similar thickness, at least that’s what I’ve often witnessed. Rockwool is a little bit considerably less dusty than thermafiber to setup, but In addition to that, You can find minimal difference between the two goods.
Over a associated observe up Notice to the air sealing challenge normally, New England has become hammered by a number of snow storms & a steady arctic chill over the last thirty day period - 9 away from ten residences on most residential blocks are scuffling with large icicles and rising ice dams...... there is not a single icicle increasing on this making!
Low-energy properties constantly demand arduous air sealing, but this job was noteworthy for The bizarre making enclosure components and the recognition that exterior rock wool is a superb Answer for “vapor-out” assemblies.
We renovated 2 rooms and insulated the outside partitions with Rockwool Comfortbatt R15s. I actually just like the rigidity and density with the Comfortbatt goods and am attempting to system the most effective system for an attic install. The rafters and joists are 2×6 lumber spaced sixteen″. I understand we have to make it possible for air flow although the soffit and will insert made or Do it yourself soffit baffles.
You may get blown mineral wool insulation. I’ve under no circumstances applied, or simply viewed, the things, nonetheless it’s to choose from. When you don’t need to use cellulose (which is frequently the preferred selection for blown in insulation within an attic), you’d almost certainly be finest off making use of blown mineral wool as opposed to batts. Blown insulation is basically most effective for an attic floor, and it’s surely the simplest to use. You furthermore may get the benefit of no problems with thermal bridging since you bury the ground joists in the insulation. Monthly bill
Roxul, in particular, likes to generate these entire "rooms" fabricated from rigid Secure'N'Audio batts at trade demonstrates in order to show how nicely they perform... but not surprisingly, you would never leave the batts like that in the real entire world.
You didn’t mention nearly anything concerning the ailments of your roof, so we’ll suppose your roof is in fantastic condition and no ice dams have formed with your roof. (Ice frozen over the roof above your exterior wall, as a result of snow melting on your own roof then refreezing nearer the sting of your respective roof, developing a “dam” which can keep h2o on your roof.). Water occasionally can leak in, and transfer by means of challenging paths to end up in surprising spots. Ideally no difficulty with your situation.
That's solidly in the course of Class-III vapor retardency, comparable to that of ordinary interior latex paint. The housewrap also could be providing not less than some number of capillary split to Restrict the amount of wicking of floor moisture into your fiber.
Exactly what is the air exchanges per hour (ACH) and/or what is the volume of the home for this air leakage consequence?
Just read through in the textual content again and desired to incorporate two or three corrections - the textual content listed our rock wool sandwich backwards - for what it really is value, we put in the four" Cavity Rock DD as our internal layer & the 2" Cavity Rock MD as our outer layer, not another way all around.
You Evidently know a great deal concerning this insulation/vapor barrier issue, and I Plainly know not a great deal. But I’ve now looked into your polyiso reference, and Consider it might be ruled out for this certain challenge. The provider for your Rockwool insulation I am investigating tells me it does not are available in a “faced” Model.
2) Stairwell Isolation Partitions: You will find now four 2X6 quasi-knee partitions that, together with an insulated stable Main door, will isolate the attic from your unheated garage below. I have begun to assume these partitions as vertical variations of the attic’s more info roof, with “breathable residence wrap” and “good vapor retarder like Membrane” similarly sandwiched within the Rockwool insulation.