"R-19 batts are quite air permeable, and on extended unobstructed rafter bays you may have quite a stack impact. It won't take a enormous amount of air leakage to offer some drying there. Also, In the event the batts are unfaced or kraft-confronted, the drying towards the inside can be considerable.
I are convinced you'll want to article a sketch. I am unable to visualize what you are talking about from your description. If you need to install an HRV with your attic, How come you must set up a water-resistant stucco roof over some sort of EPS box? Just isn't your attic now dry? Most attics have roofs.
On the subject of fluffy insulation, are there any resources you'll be able to refer me to which handle the discrepancies involving small, medium and superior density fiberglass batt insulation with the standpoint of loss of R-Worth as a result of wind-wash (irrespective of whether because of air infiltration or convection because of significant temperature variations entrance to back)?
When you are a GBA member, you presently are aware that GBA has a huge selection of architectural particulars in its detail library so that you can study and down load.
I think that most contractors would worry about the buildability of your solution. The Photograph reveals a lower-slope roof above a flat ceiling; This enables workers to face about the ceiling joists.
The key reason why to put the additional insulation in connection with the underside with the roof is the fact that find out here It is hard to confirm you have productively shut off all vents into the attic. But if you really do reach carrying out that, there should be no problem. With have a peek here a blower doorway is possible, while challenging.
Your plan to setup eight inches of rigid foam is an effective a single, however, you might be able to put in thinner foam if there is a persuasive motive to take action. Obviously, eight inches of rigid foam has the next R-value, and can perform greater, than a thinner layer.
Thanks for locating the thread over...note that in publish #seventeen, Robert Riversong talks concerning the "vented more than roof". I agree with you that this method deserves some consideration for cathedral ceilings.
A vented cathedral ceiling only is smart Should the geometry of one's roof is simple. You need a straight shot within the soffits to the ridge. That’s comparatively effortless over a gable roof with no dormers or skylights, but If your geometry of the roof is intricate — with attributes like hips, valleys, and dormers — it’s not possible to assure air movement via all of your current rafter bays.
Confident the example proven is for just a low pitch (not flat) roof. But transform it into a pitched roof under six-twelve and the main points remain a good technique (I feel).
In addition to inquiring you readers for an assessment of my strategy, I've A different concern introduced about by considerations expressed by a neighborhood builder. He is anxious that after the AC ducts are inside the conditioned Area which the ducts will likely be susceptible click for more info to sweat and will drip throughout my furniture.
A. I agree. In light-weight of your odor situation, I don't believe my suggestion to make use of Ice & H2o Shield was an excellent one -- so I withdraw it.
Suppliers of soffit vents and ridge vents normally specify The web free of charge vent spot in their solutions on product or service packaging or in technical specs accessible online.
Whether you decide to really make it vented or unvented, get the small print right — for the reason that each individual cathedral ceiling delivers possibilities to create significant issues