Need some thoughts on roof venting for the following situation.
Home is in Alaska with snow fall regularly exceeding 3 ft per season and not unheard of to get up to 2 feet in one 24 hour period.
Roof is very low pitch, dont know the actual number but high point in attic is 3.5 feet and the spread from eave/soffit vent to ridge is 20 ft for a total distance eave/soffit vent to eave/soffit vent of 40 ft. The length from gable end to gable end is 44 ft.
I will be blowing in insulation to increase r-factor by 12 on top of original bat insulation of 6 inches.
House has a ridge vent, gable vents and eave/soffit vents. When I add the additional insulation it will be above the bottom of the gables vents so I was planing on building a box inside the attic around the gables vents open at the top thus keeping the air flow unimpeded(or at least not as impeded if I did nothing or if I blocked them completely) from the gables.
I have added durovent baffles from soffit openings to well above the height of where the blown insulation will be. 10 feet of baffle in between each rafter.
There is a lot of conflicting info out there regarding the use of gable vents in conjunction with an eave and ridge vent system, thus my question.
Should I block the gable vents in this situation?
I am inclined to keep them flowing as described with the boxing around the gable inside the attic because of the possibility that snow may for some unknowable time completely block the ridge vent.