Timeline for Can I put insulation under roof between joists
Current License: CC BY-SA 3.0
3 events
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| Feb 17, 2018 at 20:18 | comment | added | Lee Sam | @JimStewart Interesting...where I live it’s mild but moist. We worry about moisture and venting. We would never consider not having an air space and providing cross ventilation. Soffit vents in each joist space with a ridge vent is common. Directly applying spray-on insulation to wood roof joists could cause dryrot...I think. However, I suppose in drier environments it could be effective. Walls and floors are different. Spray-on insulation is common there. The main issue we have is proper mixing, installation and adequate curing (out gassing). | |
| Feb 17, 2018 at 18:46 | comment | added | Jim Stewart | The details of how this 1" air space is accomplished would be very interesting. One of the original 1-story houses in our 1970 tract development has just been demolished (including slab) and a 2-story is being constructed on the lot. The builder told me that the insulation (blow "on" cellulose with binder) would be under the roof. I wonder how the 1" air gap will be provided. I suppose there will be a continuous soffit vent to vent each rafter bay? | |
| Feb 16, 2018 at 2:10 | history | answered | Lee Sam | CC BY-SA 3.0 |