I am about to start a large project (for me anyway) and I need some advice. I will be vaulting a ceiling in a kitchen extension (12’ x 12’, 6/12 roof slope, 3 foot soffits on both sides, 2x6 framing of existing roof). The current ceiling height is 8’ and the space above the ceiling (at the ridge) is approximately 4’.
- I will place 2x6 collar ties at the upper third of the rafters (or lower) – will this keep the walls from bowing – we are in NY’s Long Island – not a heavy snow area – but I don’t want to take any chances. Are the collar ties sufficient to prevent bowing of the walls?
- I am not sure if the ridge is structural or not - how can I determine if I even need to install collar ties?
- I have researched closed cell poly urethane sprayed on insulation, but at $1,500 it seems pricey. There are no soffit vents and there is no ridge vent – do I need to provide a 2” gap for air flow when there is no venting anyway? If I use regular fiberglass do you suspect I will have any issue with moisture – I intend on installing either pendent or track lighting to keep the integrity of the vapor barrier. Will this be sufficient “R” value – this is an extension over an unheated crawl space.
The ceiling will be covered in sheetrock and the collar ties will be enclosed, wiring and HVAC will go through the collar tie area and be covered by the sheet rock.
I have attached a few pics.
Is there anything I’m missing or anything else I need to know?