Winter Roof Checklist: 10 Steps to Prep Your Colorado Mountain Home

How Do You Prepare Your Roof for Winter in the Mountains?

Short answer: To prepare your roof for winter, inspect the roof surface, clean gutters and downspouts, check flashing around chimneys, skylights and vents, install or inspect snow guards, set up ice dam protection, and make sure your attic is insulated and ventilated. In Colorado's mountains, finish winter roof prep by early November, before lasting snow makes roof work harder and less safe.

Mountain winters are hard on roofs. Deep snow, ice dams, sliding snow, freeze-thaw cycles and strong wind all test every shingle, panel, seam and gutter. A small problem in October, like a loose piece of flashing or a clogged downspout, can turn into a ceiling leak or a torn-off gutter by January.

RMG Roofing & Metal has prepared roofs for Roaring Fork Valley winters since 1990. Here's the 10-step winter roof checklist we recommend for homes in Aspen, Snowmass, Basalt, Carbondale, Glenwood Springs and across the Western Slope.

The 10-Step Winter Roof Checklist

1. Inspect your roof for damage
2. Clean gutters and downspouts
3. Check flashing, chimneys, skylights and vents
4. Install or inspect snow guards
5. Set up ice dam protection
6. Check attic insulation and ventilation
7. Trim trees and clear roof debris
8. Know your roof's snow load and make a snow removal plan
9. Protect meters, vents and entrances
10. Schedule repairs and document your roof's condition

Step 1: Inspect Your Roof for Damage

A pre-winter roof inspection catches small problems before snow and ice make them worse. Look for missing, cracked or curling shingles, heavy granule loss, loose or backed-out metal roof screws, lifted panels, and damaged ridge caps. Inspect from the ground with binoculars or hire a professional; never walk on a steep or wet roof.

What to look for during a winter roof inspection:

• Asphalt shingle roofs: missing, cracked, curling or blistered shingles, and granules collecting in gutters
• Metal roofs: loose fasteners, worn washers, lifted seams, scratches that expose bare metal, and loose trim
• All roofs: sagging areas, damaged ridge caps, and signs of past leaks on ceilings or in the attic

If your roof is near the end of its life, fall is the time to plan a replacement. See our comparison of metal roof vs. shingles for mountain homes.

Step 2: Clean Gutters and Downspouts

Clean gutters and downspouts in late fall, after most leaves and needles drop. Clogged gutters hold water that freezes, adds weight, pulls gutters off the fascia, and helps form ice dams. Flush downspouts, check that gutters slope toward the outlets, and tighten loose hangers.

Mountain homes under pine, spruce and aspen often need extra attention. Fine-mesh metal gutter guards help keep needles out, and heavy-duty hangers help gutters carry snow and ice. Learn more about our gutter cleaning service.

Step 3: Check Flashing, Chimneys, Skylights and Vents

Flashing failures cause many winter roof leaks. Check the metal flashing around chimneys, skylights, plumbing vents and roof-to-wall joints for rust, gaps, lifted edges and cracked sealant. Make sure every chimney has a cap and that large chimneys have a cricket on the uphill side to divert snow and water.

Replacing worn flashing with properly fitted custom metal stops leaks at the source. Our Glenwood Springs metal shop fabricates custom flashing, chimney caps, crickets and vent boots. See custom metal fabrication for more.

Step 4: Install or Inspect Snow Guards

If you have a metal roof, snow guards are one of the most important winter safety upgrades. Snow guards and snow fences hold snow in place so it melts gradually instead of sliding off in a roof avalanche. Before winter, check existing snow guards for bent, loose or missing pieces, and add snow retention above doors, decks, driveways, walkways and gas meters.

Fall is the best time to install snow guards because the roof is dry and safe to work on. Read our guide to snow guards for metal roofs to learn about types and layouts.

Step 5: Set Up Ice Dam Protection

Ice dams form when heat melts snow on the upper roof and the meltwater refreezes at the colder eaves. To prevent ice dams, keep gutters clear, seal attic air leaks, and protect problem eaves before the first big storm. On roofs with a history of ice dams, consider an engineered roof edge system.

Ice dam protection options for mountain homes:

• Clean gutters and clear downspouts so meltwater has somewhere to go
• Ice and water shield at the eaves and valleys during any roof replacement
• Engineered roof edge panels. RMG is an authorized Thermaline installer, a roof edge system designed to stop ice dams at the eave.
• Heated gutters and downspouts on shaded, north-facing eaves

If you already have a roof heating system, test it before snow arrives. Learn more in our guide to ice dams in the Roaring Fork Valley.

Step 6: Check Attic Insulation and Ventilation

A cold roof deck is the best defense against ice dams. Warm air leaking into the attic heats the underside of the roof and melts snow from below. Before winter, check that attic insulation is even and deep enough, that soffit and ridge vents aren't blocked, and that gaps around light fixtures, attic hatches, chimneys and plumbing stacks are sealed.

Signs of attic problems include frost on the underside of the roof sheathing, damp insulation, and a roof that melts bare in patches while the rest stays snow-covered.

Step 7: Trim Trees and Clear Roof Debris

Trim branches that hang over or touch the roof before winter. Heavy snow and ice can snap limbs onto the roof, and branches drop needles and leaves that clog gutters and trap moisture. Clear pine needles and debris from roof valleys, behind chimneys and around skylights, where they hold water and speed up wear.

Clearing dry needles and leaves also reduces wildfire fuel at the roofline. See our WUI home hardening guide for more.

Step 8: Know Your Roof's Snow Load and Make a Snow Removal Plan

Every roof is designed to carry a specific snow load, and mountain roofs are built for far more snow than roofs at lower elevations. Know the warning signs of too much snow, and decide before winter who will remove snow if it builds up.

Warning signs of excessive roof snow load:

• Sagging roof lines or ceilings
• New cracks in drywall or plaster
• Interior doors that suddenly stick
• Creaking or popping sounds from the roof
• Water leaks during heavy snow

If you see these signs, stay out from under the affected area and call a professional. Roof snow removal is dangerous work, and shovels can damage shingles and metal panels. Use a roof rake from the ground for the lowest few feet of roof, and leave the rest to a pro.

Step 9: Protect Meters, Vents and Entrances

Snow and ice falling from the roof can damage gas meters, block exhaust vents and bury entrances. Before winter, make sure gas meters, furnace and water heater vents, and dryer vents are protected by snow guards or a roof overhang and stay clear all season. Blocked exhaust vents can create a carbon monoxide hazard.

Also check that entrances, walkways and decks are protected from sliding snow and gutter overflow that can freeze into dangerous ice.

Step 10: Schedule Repairs and Document Your Roof's Condition

Fix roof problems before the first lasting snow, when roofing crews can still work safely. Fall is the busiest season for roofers in mountain towns, so book repairs early.

Take dated photos of your roof, gutters, flashing and attic before winter. Keep records of inspections, gutter cleaning and repairs. If snow, ice or wind damages your roof this winter, that documentation can help support an insurance claim.

Which Winter Roof Tasks Can You DIY?

Homeowners can safely handle ground-level tasks like checking for interior leaks, looking at the roof with binoculars and checking attic insulation. Anything that requires a ladder on a tall mountain home or walking on the roof is best left to a professional.

Winter Roof Safety Tips

• Never climb onto a wet, frosty, snowy or icy roof
• Keep ladders on firm, level ground and have a spotter
• Stay clear of the eaves when snow is sliding off a metal roof
• Keep people and pets away from large icicles
• Call a pro if you see sagging or hear cracking during heavy snow

Winter Roof Prep for Commercial Buildings, Condos and HOAs

For property managers, HOA boards and business owners, winter roof prep protects shared property and reduces liability from leaks, falling ice and icy walkways. A commercial winter roof checklist adds a few items to the 10 steps above:

• Clear roof drains, scuppers and internal gutters on flat and low-slope roofs
• Check roof membranes and seams for splits, punctures and ponding areas
• Confirm snow load limits and set a snow removal plan for flat roofs
• Add snow retention above entrances, walkways and parking areas
• Inspect rooftop equipment, curbs and penetrations
• Keep written inspection records for boards, owners and insurers

RMG serves commercial, condo and HOA properties across Aspen, Snowmass, Glenwood Springs, Carbondale and Rifle. Learn more on our commercial roofing page.

Winter Roof Checklist FAQ

When should I prepare my roof for winter in Colorado?

In the Colorado mountains, aim to finish winter roof prep between mid-September and early November, before lasting snow arrives. Late fall is ideal for gutter cleaning, after most leaves and needles drop.

How do I winterize my roof?

Inspect the roof, clean gutters, check flashing and chimney caps, inspect or add snow guards, set up ice dam protection, improve attic insulation and ventilation, and schedule any repairs before the snow flies.

Should I get a roof inspection before winter?

Yes, especially if your roof is more than 10 years old, had leaks last winter, or went through hail or wind storms this year. A pre-winter roof inspection catches small issues before snow and ice turn them into leaks.

Can a roof be repaired in winter?

Some roof repairs can be done in winter during dry, mild stretches, but cold, snow and ice make most roof work harder and less safe. It's best to finish repairs in the fall.

How do I prevent ice dams this winter?

Keep gutters clean, seal attic air leaks, add insulation, keep vents clear, and protect problem eaves with an engineered roof edge system or heated gutters.

How much snow is too much for my roof?

It depends on your roof's design snow load, the snow's density and roof pitch. Wet, heavy snow weighs far more than light powder. Watch for sagging, cracks and sticking doors, and call a professional if you see them.

Do I need snow guards on my roof?

If you have a metal roof above doors, decks, driveways, walkways or gas meters, snow guards are strongly recommended in the mountains.

Book Your Pre-Winter Roof Inspection

A little prep now saves a lot of trouble later. Working through this winter roof checklist before the snow flies helps prevent leaks, ice dams, roof avalanches and costly emergency repairs.

Schedule your free, no-obligation pre-winter roof inspection and estimate today. Call RMG Roofing & Metal at 970-945-8048, visit us at 318 20th St in Glenwood Springs, or request a free estimate online. We serve Aspen, Snowmass, Basalt, Carbondale, Glenwood Springs, New Castle, Silt, Rifle, Eagle, Vail and the Western Slope.

Related reading: Metal Roof vs. Shingles · Ice Dams in the Roaring Fork Valley · Snow Guards for Metal Roofs · Custom Metal Fabrication in Glenwood Springs & Aspen

This article is for general education. Never climb onto a wet, snowy or icy roof. Snow load limits vary by roof design and local building code.