Air sealing and ventilation that keep attic heat from melting snow on a Moscow roof and feeding ice dams at the eave.
Fastest: call (833) 751-2102. Or send this and we call you back.
Attic ventilation and air sealing reduce the heat that reaches the underside of the roof, so snow does not melt from below and refreeze at the eave. An ice dam is an attic heat-loss problem before it is a roofing problem. A technician checks the attic floor, the vents and the air leaks, then recommends the work that cuts the heat.
Most of the snow that forms an ice dam melts from underneath, and the heat that does the melting comes from the house. Warm air from the living space rises through gaps around light fixtures, pipes, hatches and the top plate of the walls, fills the attic and warms the underside of the roof.
The fix starts in the attic. Air sealing closes the gaps that let warm air rise, insulation holds the heat in the living space, and ventilation moves any remaining moisture out before it can damage the boards.
A local roofer looks at the attic before recommending a roof repair. The phone line at (833) 751-2102 is answered around the clock, and a visit the same day is possible when a technician is free.
Do not walk in an attic except on the joists or a solid walkway, because the ceiling below will not hold your weight. Keep insulation away from light fixtures, flues and any heat source, and do not seal a bath fan or a vent without checking that it still exits the building. Wear a mask and gloves when working in old insulation, since dust and debris can irritate the lungs and skin. Call a professional for wiring, flue or electrical work, because a mistake in those areas is a fire risk rather than a leak.
Soffit vents at the eave and a ridge vent at the top let air move through the attic and carry away moisture. A blocked soffit or a missing ridge vent holds humid air in the attic and warms the roof boards. This work suits an attic where the boards are damp or frosted and the path for air is interrupted. The vents are cleared and the path is checked, and new vents are added only where the path is missing.
Warm air leaks through the gaps around light fixtures, bath fans, plumbing stacks and the attic hatch. Those gaps are sealed with materials suited to each penetration, so that the warm air from the living space does not rise into the attic. This work often reduces the melt on the upper roof more than adding insulation alone, and it is one of the first steps in a proper ice-dam plan.
Insulation that is thin, compressed or pushed aside by storage is topped up to keep the heat in the living space. The new insulation is kept clear of the soffit vents and the eave so that the air path is not blocked. This work suits an attic where the insulation is visibly thin, and it is planned together with air sealing so the gaps are closed before the insulation is added.
If it's an emergency, call now. For non-urgent attic ventilation and air sealing, send the form and we'll call you back.
An ice dam needs snow on the upper roof to melt and the eave to stay below freezing. The melt comes from heat that rises from the house into the attic, so the attic controls whether the snow melts at all. The roof covering only decides where the water goes after it has melted.
The University of Minnesota Extension describes the mechanism as upper roof surfaces above 32 degrees Fahrenheit while lower surfaces are below it. The upper roof becomes warm because heat from the house warms the underside of the boards.
More insulation helps, but it does not solve the problem alone if air is still leaking from the living space into the attic. Warm moist air moves through gaps even when the insulation is thick, and it warms the boards where the leaks are. Air sealing comes first, then insulation, then ventilation, in the order that makes each step work.
A thick blanket of insulation laid over open gaps still lets warm air rise through the holes around fixtures and hatches. The air carries moisture from the house, and the moisture condenses on the cold boards and can frost them.
The price depends on the size of the attic, the number and type of air leaks, how much insulation is needed, and whether the vents are blocked or missing. Access through the hatch, the height of the eave and the condition of the framing also change the work. The price is explained and approved before any work starts.
A small attic with a few leaks and open vents is a short job, while a large attic with many penetrations and blocked eaves takes longer. The number of fixtures, bath fans and plumbing stacks drives the air-sealing work, and each needs its own detail.
The first sign is less frost and damp on the underside of the boards after the next cold spell. The snow on the upper roof should melt less unevenly, and the icicles at the eave should be smaller or absent. A technician can check the attic and the eave after a winter and tell you what has changed.
Look at the snow on the roof after a snowfall. A roof that is melting unevenly, with bare patches above the living space and snow still lying over the eave, is still losing heat from below.
Some attic work, such as clearing a blocked soffit vent or checking for frost, can be done safely by a homeowner. Air sealing and insulation work near wiring, fixtures and the hatch is best done by someone who understands how the gaps and the heat move. A technician can show you what to check and do the parts that need specialist care.
Work in an attic is done on joists, since insulation hides the ceiling and a foot placed on the drywall will break through. Keep to the path, wear a dust mask and avoid disturbing wiring or fixtures.
The technician goes into the attic and looks at the underside of the roof, the insulation, the framing around the hatch and the top plates. Frost, damp and staining on the boards are noted, and the points where warm air is most likely to rise are marked. The check is made from a safe path on the joists, since insulation hides the ceiling below.
Gaps at the light fixtures, bath fans, plumbing penetrations, the attic hatch and the top plates of the walls are the usual routes for warm air. A technician uses the visible signs of frost and staining to find the most important leaks, and checks those first. The aim is to cut the largest flows of warm air before adding more insulation.
Air needs a path from the soffit vents at the eave to the ridge or a roof vent above, so that it can carry moisture out of the attic. Blocked soffits and vents covered with insulation break that path. The technician checks that each vent is open and that air can move from the eave to the top of the attic.
Air leaks are sealed with materials suited to the gap, and insulation is topped up where it is thin or pushed aside. Insulation is kept clear of the soffit vents so that the air path is not blocked. The work is planned so that the living space keeps its heat and the attic stays cold enough to stop melting the snow above.
Once the attic work is done, the technician looks at the eave and the roof above it for signs that the dam is still forming. The results are explained, and any remaining work on the roof covering or the gutters is listed separately. Because the cause is now partly in the attic, the roof repair can be planned to last through the next winter.
Moscow's winters are cold enough that heat from a house will melt snow on a roof, and the snow that sits on the upper roof of a Palouse house is often the first sign of an attic that is losing heat.
Moscow has many older houses, and the historic districts on the north-west side of the town contain century-old buildings with attics that were not built for modern insulation. The Fort Russell and Downtown districts are National Register areas, and listing on that register does not by itself set any design review.
The town also has many rental houses, and an attic in a rental is often shared between tenants or hard to reach without notice. Pullman, across the line in Washington, has its own building permit system and publishes its own design criteria, and the rules for an attic repair there are set by that state.
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Stopping eave ice dams on Palouse roofs through attic insulation, air sealing and ventilation, and safe removal when water is already getting in.
A look at the roof, gutters and attic before the first snow, to find the loose flashing and blocked gutter that cause winter leaks.
Gutter repair and new runs, planned so meltwater leaves the eave instead of freezing at it.
How snow weight, drifting and roof shape affect a Palouse roof, and who confirms the design figure for an address.
An ice dam forms when snow on the roof melts from heat escaping through the attic, then refreezes at the colder eave, where meltwater has nowhere to go.
Ventilation helps by moving moisture out of the attic and keeping the roof boards cold, but it does not stop warm air from leaking into the attic. Air sealing reduces the heat that reaches the roof, and insulation holds it in the living space. The combination of the three is what usually stops the cycle that feeds a dam.
A warm attic usually means heat from the living space is leaking up through gaps, or that the insulation is thin in places. Warm air carries moisture that condenses on the boards and can frost them. A technician can find the likely leaks and check the insulation depth, then recommend what to fix first.
More insulation helps, but it should come after the air leaks are sealed and the vents are checked. Insulation laid over open gaps does not stop warm air from rising through them. Insulation also needs to be kept clear of the soffit vents so the air path is not blocked. Ask the technician whether the attic is ready for more insulation.
Soffit vents sit under the eave and let cold air enter the attic at the bottom. Air moves up through the attic and leaves through a ridge or roof vent at the top, carrying moisture with it. A blocked soffit breaks that path and lets moisture build up. The technician checks that each soffit vent is open and clear.
Some attic work can be done in winter, provided the attic is safe to enter and the weather does not interfere with the materials. Air sealing and insulation are often easier in cold weather, since the attic is cold and the gaps are visible. A technician will say whether the work can be scheduled now or should wait for the thaw.
Attic work reduces the heat that causes new dams and melt, but it does not repair damage that has already happened. Wet insulation and damp boards need to dry, and any damaged decking or ceiling needs its own repair. A roof repair may still be needed at the eave. The technician will sort out which damage is from the attic and which is from the roof.