WDR Roofing Company Austin - Roof Repair & Replacement
Austin, TX, USA
Very handy (5*) thread. So, if you will need to use fiberglass insulation batts, and you dont have usage of spray foam or shut mobile boards, what do you need to do? I suppose The true secret is to make it unvented and increase in other air-impermeable layers. I'm about to insulate a different all-steel cathedral pitched gable roof inside the Caribean. The plan should be to fill the cavity concerning the 4" Z-purlins with R-11 batting (vapor side facing the dwelling Place). For extra heat conduction resistance we plan to roll A further thinner (filleted?) layer of the batting excessive from the purlins (ie in between the purlins and the sheeting).
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I have a 50 year-aged seasonal cottage within a northern local climate. The simple 6/12 gable roof is made up of genuine 2x6 rafters (24" oc), sheathed with 1/2" plywood and included with asphalt shingles. There is not any insulation while in the ceiling and I think little to no successful insulation inside the 2x4 partitions. In the summertime the heat obtain inside of would make living Just about unbearable. I believe that the biggest bang to the buck would be to address the ceiling insulation concern first, but would like to retain the inside visual appearance.
I by now sprayed and Minimize cobbled 4 inch of shut mobile. I'll redo the roof upcoming yr, but I assume now it is just too late to Assume about eps/iso along with roof considering the fact that i now unvented the attic.
We really don't know if these roofs have suitable vent channels, or what type of vent baffles (if any) were utilized to keep up the air flow hole concerning the top from the fiberglass insulation along with the underside in the roof sheathing.
Does it make sense to spray and cut and cobble 4 inch shut cell foam/board on underside of sheathing followed by fiberglass In the bays and one inch of eps/iso under the rafter (to prevent thermal bridging) in advance of finishing with drywall? Will I create a vapor sandwich and greater depart the final EPS and take the thermal bridging?
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A. It is sensible to you because it fulfills your preferences. As you are informed, it is not a super way to insulate your roof assembly. But you might have explained it as a temporary halt-hole measure.
As for my Electrical power auditor recommending blowing cellulose in to the mansard sides, Additionally you endorse versus that? I was beneath the impression blown cellulose helps prevent moisture migration.
Thanks - This is certainly new development, I am the designer / builder, and the greater I have a look at it, I'm liking all rigid - significantly less fussy. The highest layer of rigid more than fluffy can make my eave as well thick in any case. The air barrier to the T&G ceiling is actually the sandwich check my reference of felt and taped 3/8" CDX.
An additional difficulty that comes up in that state of affairs is whether or not that could endorse condensation over the underside on the one" XPS when it really is chilly enough outside the house because the underside of the XPS can be below the dew level? Q-3: How to proceed whenever we re-roof.
sips are excellent but inside the coldest of climates they may have encountered issues. google difficulty applications in alaska - seemingly a bunch of households there were built but not view it now enough awareness to element for the plumbing and roof vents were taken into account (Totally air restricted foamed in penetrations), mated panel seams and fastener punctures caused the highest amount osb to rot. Of course The complete roofs required alternative.
The best Alternative is to deal with your situation from earlier mentioned, by incorporating a big volume of rigid foam previously mentioned your existing roof sheathing. You'll be able to Construct up the layers oneself, of you can buy SIPs or nailbase panels.
Set up shut-mobile spray foam versus the underside on the roof sheathing, and no other type of insulation. Ensure that the thickness in the spray foam is adequate to satisfy minimum amount code requirements. Recall that open-mobile spray foam is dangerous in all local weather zones, and if open up-cell spray foam is installed With this location in a chilly local weather, the underside of your roofing company near me cured foam need to be included with gypsum drywall that has become painted with vapor-retarder paint. Vapor-retarder paint is ineffective if it is sprayed specifically about the cured foam.