syarn
Silver Member
existing shell building; 1 story; 6000 sf; climate zone 4 (NJ); type IIB; no sprinklers.
existing exterior shell wall assembly - 8" CMU, 2" airpace, 4" brick veneer, no insulation in airspace or CMU cores as far as we know...
interior fit-up scope plan review is requiring exterior wall insulation.
since the wall is existing; insulation is most easily added on the interior side which unfortunately begins to move the dew point towards the interior....with the new 2007 ashrae 90.1 the need for CI (continuous insulation) is introduced....
so what is the detail to apply R-9.5 (CI) over the masonry exterior wall and OR if it is considered steel frame R-13 cavity + R-7.5 (CI)?....this seems like new territory....never seen 2" rigid foamular for example attached to inside face of CMU..???
we were thinking of going with 1-1/2" of foamular glued or anchored to the interior CMU and than set 3-1/2" metal studs with faced batt.....
this energy code seems to not account for this scenario as opposed to building new and putting the CI in the exterior side air space......keeping the dew point closer to the exterior side.
any comments or thoughts?
existing exterior shell wall assembly - 8" CMU, 2" airpace, 4" brick veneer, no insulation in airspace or CMU cores as far as we know...
interior fit-up scope plan review is requiring exterior wall insulation.
since the wall is existing; insulation is most easily added on the interior side which unfortunately begins to move the dew point towards the interior....with the new 2007 ashrae 90.1 the need for CI (continuous insulation) is introduced....
so what is the detail to apply R-9.5 (CI) over the masonry exterior wall and OR if it is considered steel frame R-13 cavity + R-7.5 (CI)?....this seems like new territory....never seen 2" rigid foamular for example attached to inside face of CMU..???
we were thinking of going with 1-1/2" of foamular glued or anchored to the interior CMU and than set 3-1/2" metal studs with faced batt.....
this energy code seems to not account for this scenario as opposed to building new and putting the CI in the exterior side air space......keeping the dew point closer to the exterior side.
any comments or thoughts?