Why Snow Slides Off Metal Roofs
Understanding why snow slides off metal roofs helps a Cool Creek homeowner. Here is the picture.
The Smooth Surface
Metal's smooth, slick surface lets snow slide off easily, since there is little to hold it in place compared to rougher roofing. The surface is smooth. It is slick. Snow slides off it. It holds snow poorly. It promotes sliding.
Snow Releasing in Sheets
Snow can build up and then release suddenly in sheets as it warms or loosens, sliding off the roof all at once rather than gradually. Snow can release suddenly. It comes off in sheets. It slides all at once. It can be abrupt. It is the concern.
A Benefit and a Concern
The shedding is partly a benefit, since snow does not accumulate heavily, but the sudden release can be a concern over areas below. It has two sides. Shedding sheds load. Sudden release is a concern. It is a trade off. It warrants management.
Where It Becomes a Problem
The sliding becomes a problem where the snow lands on something below, like an entry, walkway, or lower roof, which is where snow guards help. It matters at the landing spot. It affects areas below. It is a problem there. Snow guards address it. It is targeted.
Why It Slides, in Short
Metal's smooth surface lets snow slide off easily, and snow can build up and then release suddenly in sheets as it warms or loosens, which is partly a benefit since snow does not accumulate heavily but a concern where it lands on an entry, walkway, or lower roof below, which is where snow guards help.
One point worth making clear for Cool Creek homeowners in areas that see snow is that one of metal roofing's characteristics, the way snow tends to slide off it, is mostly a benefit but comes with a consideration worth managing, and snow guards are the way to manage it. The reason snow slides off a metal roof is simply that metal has a smooth, slick surface, which gives snow very little to hold onto compared to rougher roofing materials. For the most part this is a good thing, because it means snow does not accumulate as heavily on the roof, reducing the load it has to bear. The consideration is that snow on a metal roof can build up and then release suddenly, sliding off in sheets all at once as it warms or loosens, rather than melting away gradually in place. This sudden release is where the concern lies, because of where the snow lands. If a large mass of snow slides off the roof and comes down onto an entry or doorway where people come and go, a walkway where people pass, a lower roof, or property below such as landscaping or vehicles, it can be a genuine safety and property concern. This is precisely what snow guards are designed to address. Snow guards are devices installed on the roof that hold the snow in place, giving it something to catch on so that, instead of sliding off freely and suddenly, it melts and releases gradually in a controlled way. They come in different types and styles suited to different roofs, and they work together across the roof to retain the snow effectively, which keeps it from coming down all at once onto whatever is below.
One point worth making clear for Cool Creek homeowners in areas that see snow is that one of metal roofing's characteristics, the way snow tends to slide off it, is mostly a benefit but comes with a consideration worth managing, and snow guards are the way to manage it. The reason snow slides off a metal roof is simply that metal has a smooth, slick surface, which gives snow very little to hold onto compared to rougher roofing materials. For the most part this is a good thing, because it means snow does not accumulate as heavily on the roof, reducing the load it has to bear. The consideration is that snow on a metal roof can build up and then release suddenly, sliding off in sheets all at once as it warms or loosens, rather than melting away gradually in place. This sudden release is where the concern lies, because of where the snow lands. If a large mass of snow slides off the roof and comes down onto an entry or doorway where people come and go, a walkway where people pass, a lower roof, or property below such as landscaping or vehicles, it can be a genuine safety and property concern. This is precisely what snow guards are designed to address. Snow guards are devices installed on the roof that hold the snow in place, giving it something to catch on so that, instead of sliding off freely and suddenly, it melts and releases gradually in a controlled way. They come in different types and styles suited to different roofs, and they work together across the roof to retain the snow effectively, which keeps it from coming down all at once onto whatever is below.
It also helps Cool Creek homeowners to understand where snow guards are placed and why proper installation matters, because the value of snow retention comes from putting the guards in the right places and installing them soundly. On placement, snow guards are positioned where sliding snow would actually be a concern, which is why placement is based on the particular roof's layout and the spots where snow coming down would cause a problem. Common locations include above entries and doorways, so that snow does not slide down onto people coming and going, over walkways and paths where people pass below, above any lower roof that sliding snow could impact, and along eaves and other areas where sliding snow would be a concern. A contractor assesses the roof and determines the right spots and the right number of guards for effective retention. On installation, the key is that snow guards must be attached properly to the specific metal roof system, whether that is standing seam, exposed fastener, or another type, so that they hold the snow securely without compromising the roof or its water tightness. This is genuinely important, because guards that are not attached correctly could fail to hold the snow or could affect the roof, so the work is best done by a professional who knows how to select, place, and attach snow guards appropriately for the roof in question. In snowy areas, snow retention is really part of what makes a metal roof a complete, well considered installation, because it addresses the sliding snow that the smooth metal surface naturally produces, protecting the people and property below and giving the homeowner peace of mind through the winter.
Manage Sliding Snow With Us
Cool Creek Metal Roofing installs metal roofing and snow retention across Cool Creek and Hamilton County. Call (765) 676-3491 for a free consultation on managing sliding snow on your metal roof.