Roof vents and ridge vents can indeed get snowed over during a week or two or three each winter. That said, most folks experience a couple of factors which help clear those vents.
1.) Bright sunshine. The dark colors of the roof and the vent metal act in a way to absorb even winter sunlight and will eventually "self clear".
2.) The air rising or attempting to rise through the vents can be 10 degrees warmer than the ambient air and this also can help contribute to clearing.
3.) A thaw. Nature itself provides breaks. It is pretty rare that snow that falls in December is still up on your shed roof in March, just saying.
The over all benefit of having roof vents as opposed to not having roof vents is a positive trade-off. Far better to have them.
Yes, our barn was constructed so as to have ventilation that cannot be plugged or covered with snow. Those things were factored into the pre-build design.
1.) Bright sunshine. The dark colors of the roof and the vent metal act in a way to absorb even winter sunlight and will eventually "self clear".
2.) The air rising or attempting to rise through the vents can be 10 degrees warmer than the ambient air and this also can help contribute to clearing.
3.) A thaw. Nature itself provides breaks. It is pretty rare that snow that falls in December is still up on your shed roof in March, just saying.
The over all benefit of having roof vents as opposed to not having roof vents is a positive trade-off. Far better to have them.
Yes, our barn was constructed so as to have ventilation that cannot be plugged or covered with snow. Those things were factored into the pre-build design.