In Sioux Falls, the attic decides how well a roof gets through winter. A cold, well-ventilated attic over good insulation keeps snow from melting unevenly and frost from forming under the deck. Most roof care here is about that, plus checking for storm damage.
Price ranges on this page are national figures published by HomeGuide for 2026. They are not our quotes. Local labor, material prices, the pitch of the roof and what we find under the old shingles move the number up or down. Last checked October 2026.
Why does roof ventilation matter?
Roof ventilation matters because it carries heat and moisture out of the attic. Air comes in at the soffits and leaves at the ridge. In winter that keeps the roof deck cold and dry. In summer it lowers attic heat that ages shingles. Blocked soffit vents are a common fault in older homes, often buried under insulation. A ridge vent costs $350 to $600 installed nationally.
What causes ice dams?
Ice dams form when heat leaking from the house melts snow on the upper roof. The water runs down to the cold eave and freezes. Ice builds into a ridge, and meltwater backs up behind it and under the shingles. They are common here, mostly on older homes and after heavy snow followed by cold. The cure is in the attic: seal air leaks, add insulation and open the ventilation. The ice barrier that the city code requires limits the damage but does not stop the ice. HomeGuide lists $200 to $300 for minor ice dam removal and $800 to $2,400 for major removal with steam.
Why is there moss, algae or black streaks on my roof?
Black streaks are algae, which feed on the filler in shingles and show mostly on shaded north slopes. They are a cosmetic issue. Moss is less common in our dry, cold climate, but it grows under trees and near the river. Moss holds water against the shingles and should come off. Zinc strips fixed near the ridge slow new moss and algae on the shingles just below them, as rain washes over the metal. They do not clear growth that is already there, and the effect fades lower on the slope. Few roofs in Sioux Falls need them.
Should I clean or pressure wash my roof?
Do not pressure wash a shingle roof. High pressure strips the granules and can force water under the tabs. If cleaning is needed, a low-pressure soft wash with a cleaner made for roofs is the method. Roof cleaning costs $250 to $600 on average nationally.
Do I need new gutters with a new roof?
You do not need new gutters with every new roof. Replace them if they are dented by hail, pulling off the fascia, leaking at the seams or too small for the roof. It is the easiest time to do it, because the roof edge is open. Sound gutters can stay.
Do gutter guards work?
Gutter guards work for leaves and seeds, but they are not maintenance-free. Fine debris and shingle granules still collect, and in winter ice can form on top of some guard types. Nationally they cost $15 to $45 per linear foot installed. They make the most sense under mature trees.
How do hail, wind and snow wear out a roof in Sioux Falls?
Hail, wind and snow wear a roof out here faster than sun does. Hail knocks off granules and bruises the mat. Wind breaks the seal between shingles, and once tabs lift they crease and tear. Snow and ice load the eaves and work water into gaps. Swings from deep cold to summer heat make every material expand and shrink, which loosens flashing, sealant and fasteners.
Why is there frost or condensation in my attic?
Frost and condensation in the attic come from warm, moist house air leaking upward and meeting the cold roof deck. In a cold snap it freezes on nails and sheathing. When the weather warms it melts and drips, and it can look like a roof leak. Common sources are bath fans that vent into the attic, leaky attic hatches and gaps around light fittings. Sealing those and improving ventilation fixes it.
Should snow be removed from my roof?
Most pitched house roofs do not need snow removed in a normal winter. Removal makes sense when ice dams are forming, when drifts are very deep, or on flat and low-slope roofs where snow piles against walls. Use a roof rake from the ground on the lower few feet and stay off the roof. HomeGuide lists $200 to $500 per visit for roof snow removal nationally. We remove heavy snow and ice from flat roofs.
How often should a roof be inspected?
A roof should be inspected once a year, and after any hail or strong wind. Spring is a good time, once the snow is gone. Flat and commercial roofs should be checked in spring and fall. Our inspections are free and come with photos.
How do I know if my attic has enough ventilation?
Your attic has enough ventilation if it stays close to the outdoor temperature and dry. Signs that it does not: frost on the nails in winter, damp or matted insulation, a hot stuffy attic in summer, ice dams, or dark stains on the decking. Look for open soffit vents low and a ridge vent or roof vents high, with a clear path between them. We check intake and exhaust during a roof inspection.
Do I need ridge vents or soffit vents with a new roof?
You need both intake and exhaust, and a new roof is the time to fix them. A ridge vent lets air out at the top only if soffit vents let air in at the bottom. A ridge vent with blocked soffits does very little. Mixing a ridge vent with box vents or a powered fan can short-circuit the airflow, so one exhaust type is best.
Do powered attic fans help?
Sometimes, but powered attic fans are rarely the best fix. A fan can pull heated or cooled air out of the house through ceiling gaps, which raises your bills and, in winter, draws moist air into the attic. Passive soffit and ridge vents with a sealed ceiling work all year with nothing to break. HomeGuide lists $300 to $900 for an attic fan installed nationally.
Why is there mold on the underside of my roof deck in the attic?
Mold on the underside of the roof deck almost always comes from moist house air, not a roof leak. Warm air rises through gaps in the ceiling and condenses on the cold wood all winter. A leak leaves one stained area. Condensation leaves spotting spread across the north side or the whole deck. The fix is to vent bath and dryer fans outdoors, seal the ceiling and open the ventilation. A remediation company treats the mold itself.
Are heat cables worth it?
Heat cables are worth it only as a last resort. They melt channels through an ice dam so water can drain, and they help on a problem valley or a stretch of eave that cannot be fixed from the attic. They do not remove the cause, they use electricity all winter and they wear out. HomeGuide lists roof heating cables at $5 to $15 per linear foot, or $500 to $1,500, as a national figure. Air sealing and insulation come first.
How much snow can my roof hold?
A house roof built to the Sioux Falls code is designed around a ground snow load of 40 pounds per square foot, which covers a normal winter with room to spare. There is no single safe depth, because light fresh snow weighs a fraction of what wet snow or ice weighs at the same depth. Older homes and garages may have been built to lower values. Warning signs are doors that start to stick, new cracks in ceilings, creaking and a visible sag. If you see them, leave the room below and call.
Should I rake or shovel snow off my roof?
Rake, do not shovel. A roof rake used from the ground clears the lower three or four feet, which is enough to relieve an ice dam. Leave a thin layer of snow so the rake does not scrape granules off. Do not climb onto a snowy roof and do not chip at ice with a shovel or hammer, since that breaks cold shingles. Watch for power lines and for snow sliding onto you.
How do I tell hail damage from normal wear?
Hail damage is random and wear is even. A hail hit is a round bruise where granules are crushed into the mat, soft to the touch like a bruise on an apple, scattered across slopes that faced the storm. Normal wear shows as even granule loss, blisters, or cracks that follow a pattern. Soft metal is the tell. If gutters, downspouts, vents and flashing are dented, hail was large enough to check the shingles closely, but dented metal alone does not prove the shingles are damaged. Hail can also bruise a roof with nothing visible from the ground.
Does every hailstorm mean I need a new roof?
No. Every hailstorm does not mean a new roof. Small hail often does nothing to a sound shingle roof. Have the roof inspected after a storm with large stones or dented metal, and keep the dated photos even if nothing is found. They show the roof's condition if a later storm does real damage. Be wary of anyone who says a roof is totalled without showing you the bruises.
A free roof inspection with photos and a written quote is the only way to get a real price for your roof. Call (605) 273-7260 or send the form on this page.