Snow coming through roof vents.
Snow blowing in roof vents.
1500 300 5 times 144 720 2 360sq inches of exhaust and at least the same amount of intake.
We got a new roof 2 years ago and for the first time snow had blown in the roof vents and made a nice little pile that melted into water under each vent.
Failing vents cause rot mould insulation damage call backs thousands of dollars of repairs and disappointed customers.
The damage was minimal but i d like to stop this from happening again.
Fire protection vents and filters prevent fire embers wind driven rain dust debris and nesting animals and rodents from entering your home through the attic vent.
A well ventilated home is drier healthier and more comfortable.
I can tell you that when the snow is dry and light and the wind is high it will blow in through most if not all roof vents that i know of.
So there s a type of vent that s called a filter vent and it s made by certainteed.
When conditions permit i e.
We roofers never used to have a choice but now we do.
Roofers often complain that roof vents battered by storms can fail allowing blowing snow and rain to penetrate the attic.
Snow is off the roof and it is safe to go up there check every inch of the vent to make sure it is tightly secured to the roof.
As you can see in the pictures the vent is constructed correctly with screen and mesh but this fine snow can still make it s way into your attic.
It looks like the amount of exhaust is up to code for 1500 sf attic space.
By replacing your existing vents with an embers out vent your home will have an added layer of protection from the elements.
In a windy location such as wisconsin near lake michigan the fine snow that rests on the roof can get whipped up and blow about like a mini blizzard.
About california ventilation building codes.
Snow blowing in through roof vents.
And it s a good quality ridge vent but it has the added addition of a filter material that is in the baffle part of it in the porous part of it so that that stops the snow from doing exactly what it s doing in your case which is blowing in.
This snow usually evaporates my overkill was to put large aluminum tinfoil oven pans under each of my roof vents to catch and hold the snow that will form a small hill under each vents with the right conditions.
Well placed windows doors and other openings allow air to circulate without creating.
One was right above the attic door so there was water staining.
Ventilation is code btw so lose that roofer if you re really a gc.
