We're going to give it a check out. Current is usually a fourteen year previous roof with 2" of closed mobile roofing foam having an acrylic elastomeric coating.
Should you go ahead with all your prepare, it is best to incorporate a smart vapor retarder on the interior side of the assembly, to reduce the transportation of humidity from the inside towards the sheathing.
I have a number of inquiries that include many of the matters that you've protected in these posts, but I am seeking to implement them in a very retrofit situation. We're engaged on upgrading the Electrical power performance, like added/updating insulation, for our almost one hundred year outdated 2-1/2 story balloon body household (stucco above lathe exterior).
Q. "Should I bite the bullet and possibility of spray foam insulation, or send the builders back again up over the roof in December to chop ridge and soffit vents?"
It is best to check with an electrician about The obvious way to serve your ceiling electrical boxes. There are several doable methods -- some noticeable from the interior, and some concealed by The brand new foam.
As I explained during the write-up on this site, You can not use fluffy (air-permeable) insulation within an unvented roof assembly Unless of course you contain rigid foam or spray foam higher than the fluffy insulation.
Q. "I have already been using rigid breadboard design and style expanded polystyrene from the rim joists and imagined a similar may be set underneath the sheathing involving the rafter bays."
If you want to put in a combination of closed-cell spray-foam over the underside in the roof sheathing and air-permeable insulation between your rafters — an solution in some cases identified as “flash and batt†— the constructing code demands that spray foam (or, arguably, rigid foam insulation) be “applied in immediate contact with the underside in the structural roof sheathing†and that the foam insulation satisfy the necessities “specified in Table R806.
I don't have expertise developing in the Carribbean or constructing steel buildings, so I'm not the most effective person to comment. But here are some reflections:
Have room around garage Centre with closets on both sides concerning the closet kneewalls as well as eaves. Insulation more than the space segment is six inches of foam slabs sealed by "Excellent Stuff" spray-in foam. Earlier mentioned this ceiling foam and under the roof plywood, you will find one inch x twenty. inch unobstructed foam encased ducts involving the rafters for venting to the roof peak vent. The facet sections outside the house the knee partitions are insulated with rolled read this post here fiberglass fiber with durovent ducts between the insulation as well as the roof plywood. You can find considerable soffit vents at the base on the durovent ducts.
I suspect that Bill Rose is true: every one of these failures contain dampness that is certainly carried by transferring air. They are not diffusion failures. In the event the rafter bays really are properly dense-packed -- a major if -- the Continue prospect of air motion is incredibly lower.
Q. "You say 'You don't want an inside vapor barrier,' but You furthermore may claim that 'you need a explanation good air barrier on each side of your fiberglass batts.' The latter would change into an inside vapor barrier not so?"
Because a roof assembly won't Adhere to the rules set up from the setting up code or tips of making researchers doesn't mean the roof has
I'm not sure how to proceed with regard to the electrical for the existing enthusiast, and for that not-nevertheless-mounted but much wished-for observe lighting. Within the previous roof, the fan's electrical offer ran in addition to the T&G ceiling, and was covered by what appeared like electrical tape, then by a one/2" layer of sound insulation board, after which you can from the felt and shingles.