two. Put in strong web site-created ventilation baffles in each rafter bay before you spray the foam. That way you end up getting a vented cathedral ceiling.
I thank you for this impeccably timed weblog, as I am currently framing my semi-fundamental cathedral ceiling hip roof (with quick ridge). I would want to explain my depth and take a look at to be aware of wherever I am on the correct observe and even more importantly, in which I can have failures. Hope I am able to amuse some of you...I come to feel like the far more I try to deal with a priority, the greater of a concern it gets, and I certainly don't desire to acquire great time, care, and detail to facilitate the demise of my roof.
If you wish to develop a conditioned attic, this informative article tells you what you need to know. To learn more on The subject, see Making a Conditioned Attic.
I've many partitions to re-insulate, and once the roof is addressed I'll have rafter bays to insulate, and it would be useful to have some insight into which sort of fiberglass will give you what advantage for its Price tag.
If We will place some insulation previously mentioned the ceiling, then I would like to set All of the insulation previously mentioned the ceiling, and stay away from the Value and trouble of a fresh decreased ceiling. That means a Develop-up of eight", making use of XPS. If we build up the roof line over the cathedral ceiling in the family members place by 8", we presumably have to have to create up the remainder of the adjoining gable roof as well.
Make sure to set up insulation that provides no less than the minimal code necessity for ceiling R-worth. Insulation that exceeds the least code requirement is even better.
Confident It is really many difficulty. It appears like significantly less issues the element posted as case in point within the blog above and utilizes no foam... Which is a "biggie" for me.
Perhaps the technique to go is to accept four" right here of froth around the cathedral ceiling, rather than eight" of foam, and NOT continue on the foam over the vented attic. There'll certainly be a Odd jog in the roof line where the foam commences, but it will largely only be seen from the back again of your house, not from look at here the street.
Thanks for locating the thread above...Take note that in publish #17, Robert Riversong talks in regards to the "vented more than roof". I agree along with you that this technique deserves some consideration for cathedral ceilings.
Yesterday we blew the insulation and put in the SIGA Majcoat about the CAPACES Leadership Institute. There was over 8,000 Cubic toes of insulation to setup, so our insulators experienced two in their blower trucks and a superb crew on web-site. They have been blowing cellulose as quick as they could as well as the the rain was heading our direction. A lot less than 45 minutes once the insulation was concluded we experienced finished the Majcoat and ended up fast paced taping seams.
I've a partial cathedral ceiling while in the concluded attic of my house in zone 4 (TN). Every single slope with the roof is split about in thirds by 3 distinctive conditions: knee walls in the outer thirds, "cathedral" ceiling in the middle thirds, plus a vented "attic" in the middle 3rd using a ridge vent - a standard circumstance with finished attics, at the very least around in this article. I have a huge difficulty in the summer with overheating. The insulation is visit this web-site just not Doing the job nicely mainly because it was improperly insulated with just R-19 fiberglass batts concerning the rafters with no ventilation baffle or sufficient soffit venting and only r-19 blown to the "attic Place". Also, my upstairs HVAC ducts are operate during the actually hot "attic" Area under the ridge. Determined by what i haved discovered from several articles or blog posts right here, my planned Answer would be to cathedralize all the roof, eave to ridge: set up continous air-restricted web-site-crafted 2" vent channels making use of foil-faced polyiso board (as prompt in ), setting up continuous soffit vents to greatly Enhance the airflow from soffit to ridge, producing an air-limited ceiling below the rafters, and, most significantly, deliver the ductwork In the conditioned envelope.
Also, wouldn't the site-crafted plywood baffles among the rafters contain the similar issue; sluggish drying by means of diffusion? ( I suppose I could use fiberboard for baffles)
I do not believe that the burden of plywood or OSB is going to be a difficulty, but If you're worried about the additional body weight, you are able to generally seek advice from an engineer.
The aged Canadian guideline -- at least two/3 of the full R-worth on the outside facet of the vapor barrier -- is usually a tough-and-ready way to address this issue; It is also doable to tactic the problem by undertaking a dew-position Evaluation or possibly a WUFI Investigation.