I are actually making use of rigid breadboard type expanded polystyrene from the rim joists and imagined precisely the same may be set beneath the sheathing among the rafter bays, and with any gaps sealed by using a urethane spray foam which include Fill and Seal. Is there a top quality which makes spray foam acceptable and rigid foam unacceptable?
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So a hybrid strategy must be investigated. Dense packed cathedrals with warmside ridged foam to add R, taped, no recessed lighting or other air paths after which belt and suspenders... Incorporate venting Although there is absolutely no regular 1" vent route.
Your home is at about four,500 ft. We only get about three' of snow a year and it seldom stays within the roof for a lot more than week a few occasions a year. I'm on an exceedingly restricted funds, just trying to make the position livable. Any recommendations are welcome.
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Q. "If I execute the unvented roof as developed and put four inches of polysio within the roof deck, am i able to then use open-cell foam between the rafters?"
You are not the only real person using this type of concern. For those who (like you) are concerned about The problem, there are two alternatives:
I don’t Assume I'm able to meet most of the suggestions which i’ve Keep reading this Site, specified current building constraints and reluctance of my contractor to implement insulation above the sheathing and foam for The brand new cavity.
Magic bullet status is not attained. It is a design and style for your very low slope roof. It is really very much alongside the lines of Doug McEvers utilization of significant perm fibre board to create vent channels previously mentioned dense packed cellulose.
Besides inquiring you visitors for a review of my approach, I have another concern introduced about by problems expressed by an area builder. He is concerned that after the AC ducts are Within the conditioned House which the ducts might be vulnerable to sweat and can drip around my home furniture.
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I've loads of walls to re-insulate, and as soon as the roof is addressed I'll have rafter bays to insulate, and It might be beneficial to acquire some Perception into which type of fiberglass provides what profit for its Price tag.
I am like a photograph of the solution: spray foam held down in the top rated fringe of the rafters in order that air is usually drawn up from soffit vents to here gable vents from the truncated attic cavity.
A vented cathedral ceiling only is smart When the geometry of the roof is simple. You'll need a straight shot from your soffits to the ridge. That’s somewhat easy with a gable roof without any dormers or skylights, but If your geometry of your roof is complicated — with characteristics like hips, valleys, and dormers — it’s not possible to assure air movement through your entire rafter bays.