WDR Roofing Company Austin - Roof Repair & Replacement
Austin, TX, USA
Your plan to make use of two-inch-thick EPS as your ventilation baffle will do the job. The EPS is somewhat vapor-permeable, so it enables a little bit of outward drying. (In any circumstance, in the event you Make a reasonably airtight ceiling, there will not be any dampness in this assembly that really should escape.)
Like most mansard roofs, your roof is unvented. Your mansard roof has various sections -- the steep sections on the perimeter, along with the low-slope part in the center. All these sections need to be insulated in an identical way, mainly because all of these roof assemblies are unvented.
Here's the typical respond to for many who must comply with most creating codes (the answer arises from an short article by Mike Guertin):
Q. "For an unvented building with no insulation above the sheathing, how about using wood fibreboard among the rafters immediately beneath and in contact with the sheathing?"
If you prefer, it is possible to locate your ventilation channels along with the roof sheathing as an alternative to beneath the roof sheathing. If you decide to do that, make sure that any roofing underlayment that you install earlier mentioned the roof sheathing is vapor-permeable — by way of example, #15 asphalt felt, VaproShield SlopeShield, or Solitex Mento — and that your local developing Division accepts this approach to roof venting.
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The GBA website does not offer custom made information. That's what an architect or an engineer is for; I suggest that you use just one.
If you'd like to use rigid foam, the best place to place it's along with your roof sheathing, not beneath your roof sheathing.
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However, I believe you're wrong about your asphalt felt; I question if the felt is impermeable to water vapor. Most different types of asphalt felt are considerably permeable -- commonly 5 perms when dry and nearly 60 perms when wet.
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Thanks roofing company corpus christi for that enter. I see a visit with a structural engineer and 35 sq. of polyiso in my near long run.
I've created log properties in the Yukon Territory in northern Canada for thirty yrs. Most log buildings have cathedral look at this website ceilings. The majority of the roofs We have now constructed are as follows (from the bottom up): log purloins, nominal 2" (2x6) t&g decking, 6mil poly, one one/2" extruded polystyrene foam, 2x10 rafters on 24" facilities, seven" fiberglass, 2x4 strapping, seven/16 OSB, underlayment (15 lb paper, 30lb felt, or now we might even use ice and h2o protect). There can be about an inch of air Place down below the strapping for the two vertical and horizontal air move. All roofs are vented with strip vents in the eaves and vents inside the soffit (2x6 t&g) at the height at each finishes. I might disagree that venting will not be desired when you end the airflow on The nice and cozy facet, for two explanations. To start with it really is very hard to stop all airflow, Primarily with common standard tactics (ie chimney and plumbing vent penetrations through the roof) We've quite a few methods created through the years to seal the vb in the eaves and gables, but there remain nail penetrations with the vb. Over-all I think we had really restricted seals but one particular could under no circumstances say airtight.