Air sealing check
A check of the gaps that let warm air into the attic. Air sealing at the hatch, the light fixtures and the pipes is often the first change that helps.
Serving Nassau County
Attic Ventilation and Moisture Check in Hempstead, NY
A check of the attic's air sealing, insulation and ventilation, which decides how warm the roof gets in winter and how much moisture reaches the decking.
- Nor'easter and storm damage
- Nassau County roofs
- Roof repair and replacement
Get a fast quote
Fastest: call (833) 751-2102. Or send this and we call you back.
Attic Ventilation
Attic Ventilation and Moisture Check: what it covers
Quick answer
The attic decides how the roof behaves in winter. Warm, moist air from the house leaks into the attic, warms the roof and melts the snow that refreezes at the eave. A check in Hempstead looks at the air sealing, the insulation and the ventilation at the eave and the ridge, and the moisture on the decking that these conditions cause.
A roof often fails from the inside. Warm, moist air from the living space rises through gaps around the light fixtures, the pipes and the attic hatch, and it condenses on the cold underside of the roof boards. The damp rots the decking over time, and the warmth melts the snow that forms the ice dam at the eave.
Hempstead Roofing checks attic ventilation and moisture across Hempstead and Nassau County. Winter ice dams are a named roof risk for Long Island, and the attic is the part of the house that feeds them. A check finds the gaps and the missing ventilation, and sets out what would reduce the heat and the moisture.
The check is practical and does not require the attic to be rebuilt. The roofer looks at the air sealing, the insulation depth, the ventilation at the eave and the ridge, and the condition of the decking. The note says which changes would help and in what order.
- Service area
- Hempstead & Nassau County
- Availability
- Phones answered 24/7
- Phone
- (833) 751-2102
Warning signs
Signs you need attic ventilation and moisture check
Do not walk on the attic insulation or the ceiling joists, since the ceiling can give way. Use a stable light, keep the attic hatch clear and make sure the roofer has a safe way into the attic. Keep children and pets out of the attic during the check.
- Frost on the underside of the roof boards in the attic on a cold morning
- Damp or stained insulation, especially near the attic hatch or light fixtures
- Dark spotting or soft wood on the decking at the eave or along the rafters
- Ice dams at the eave each winter, with the snow melted off the upper roof
- A musty smell in the attic, or mould on the rafters
- Warm spots on the ceiling below the attic hatch during the winter
Our process
How our attic ventilation and moisture check visit works
Look at the attic air leaks
The attic is checked for gaps around the hatch, the light fixtures, the pipe penetrations and the top plates of the walls, where warm air escapes into the attic.
Check the insulation and the ventilation
The depth of the insulation is noted, along with the soffit vents at the eave and the ridge vent at the top, and any blockage that stops the air moving.
Check the decking for moisture
The decking is checked for damp, staining and soft wood, especially along the rafters and at the eave. The moisture is traced to its source where possible.
Write the note
The note lists the air leaks, the insulation and ventilation findings and the decking condition, with the changes that would help in order of priority.
How does the attic cause an ice dam?
Warm air from the house leaks into the attic, warms the underside of the roof and melts the snow above it. The meltwater runs to the cold eave and refreezes into a dam.
The attic is the link between the warm house and the cold roof. Heat that escapes through gaps in the ceiling warms the attic and the roof boards, and the snow above melts. The water runs down the roof to the eave, which is colder because it overhangs the wall, and refreezes there.
Reducing the heat that reaches the roof stops the melt. Air sealing, insulation and ventilation at the eave all contribute, and together they keep the roof at the same temperature as the outside air.
Why is the moisture on the decking a problem?
Because damp that condenses on cold decking rots the boards and weakens the fixings. Moisture in the attic is a slow form of roof damage that does not show from the ground.
Warm, moist air that reaches the cold underside of the decking condenses there, and the damp soaks into the boards. Over winters the wood darkens, softens and loses its grip on the nails. The shingles then fail, and a leak appears where the decking has rotted.
A check finds the damp before the decking rots, and the changes in air sealing and ventilation stop the moisture reaching the decking in the first place.
What is the right amount of ventilation?
Enough intake at the eave and exhaust at the ridge to keep the attic close to the outside temperature. The roofer checks the balance and the blockages, and says what would help.
Ventilation works by drawing cool air in at the eave and letting warm, moist air out at the ridge. The air must have a clear path, and insulation must not block the soffit vents. A blocked soffit or a missing ridge vent leaves the attic warm and damp.
The roofer checks the vents for blockage and notes whether the balance is right. The changes are recommended in the note, and the homeowner decides whether to have them done.
What can the homeowner do before the roofer comes?
Note the frost, the stains and the warm spots in the house, and photograph the attic from the hatch if it is safe. Clear the insulation away from the soffit vents if it is easy to reach.
Look at the ceilings below the attic hatch during the winter for warm spots, and check the attic on a cold morning for frost. Photograph anything you find, with the date and the time.
Do not disturb insulation or walk on it in the attic, since insulation that is compressed loses its value. Let the roofer do any work that involves the attic floor.
- Note frost and warm spots on cold mornings
- Photograph the attic from the hatch if safe
- Do not compress or walk on the insulation
- Report any musty smell or mould on the rafters
What is the difference between this check and a roof repair?
The check looks at the attic and the conditions that feed the roof's problems. A roof repair fixes the covering or the flashing that has failed.
A repair fixes the parts of the roof that have failed. An attic check looks at the air leaks and the ventilation that cause the moisture and the ice, and it recommends the changes that stop the problem coming back.
Both are useful. A roof that has been repaired but not ventilated will see the dam and the damp return, and a ventilated attic on a roof with failed flashing will still leak.
What does a healthy attic look like in winter?
Cold, dry and close to the outside temperature, with frost-free roof boards and insulation that is dry and even. An attic that is warm, damp or frosted on the roof boards is not doing its job.
In winter a healthy attic is cold and dry. The roof boards are cold but free of frost, and the insulation is dry and in an even layer. The air moves freely from the soffit vents to the ridge vent, and the attic temperature stays close to the outside air. That is the condition that keeps the snow on the roof from melting unevenly.
An attic that is warm, damp or frosted on the roof boards shows that the warm air from the house is getting in, or that the ventilation is not moving the air. The check looks for the causes, and the note sets out the changes.
Options
Types and options for attic ventilation and moisture check
Insulation and ventilation review
A review of the insulation depth and the soffit and ridge ventilation, with the changes that would keep the roof cold in winter.
Decking moisture check
A check of the decking for moisture and rot, with the source of the damp traced where possible and the affected boards noted.
Nassau County
Why attic ventilation and moisture check is different in Long Island
The attic check in Hempstead and across Nassau County looks for the winter conditions the Long Island climate brings, and for the ice dam risk named for the area.
Attics in the Hempstead area are checked for air leaks at the hatch and the light fixtures, which are the common gaps in houses of any age.
Calls are answered 24/7. A check is booked for the next available slot, and the homeowner is asked to have the attic hatch clear and accessible.
Skip the guesswork. Call for a straight answer.
Tell us what's happening and we'll tell you honestly whether it's a quick fix, and what attic ventilation and moisture check should cost.
Where we work
Attic Ventilation and Moisture Check across Nassau County
- Attic Ventilation in Hempstead
- Attic Ventilation in Uniondale
- Attic Ventilation in Garden City
- Attic Ventilation in West Hempstead
- Attic Ventilation in Roosevelt
- Attic Ventilation in Franklin Square
- Attic Ventilation in Mineola
- Attic Ventilation in Carle Place
- Attic Ventilation in Rockville Centre
- Attic Ventilation in East Meadow
- Attic Ventilation in Baldwin
- Attic Ventilation in Malverne
- Attic Ventilation in New Hyde Park
- Attic Ventilation in Freeport
- Attic Ventilation in Lynbrook
- Attic Ventilation in Elmont
- Attic Ventilation in Floral Park
- Attic Ventilation in Bellmore
- Attic Ventilation in Oceanside
- Attic Ventilation in Levittown
- Attic Ventilation in Valley Stream
- Attic Ventilation in Wantagh
- Attic Ventilation in Hicksville
- Attic Ventilation in Seaford
- Attic Ventilation in Long Beach
- Attic Ventilation in Massapequa
- Attic Ventilation in Plainview
- Attic Ventilation in Farmingdale
Not sure if you're covered? Check your ZIP code.
Related
Related services
Ice Dam Roof Repair
Removing the ice that is backing water under the shingles, repairing the leak it caused and checking the attic ventilation that lets the roof edge freeze.
Roof Maintenance Plan
A seasonal check of the roof, the flashing, the gutters and the attic, timed before winter and after storms, with a written note of each visit.
Written Roof Inspection Report
A dated record of the roof's condition, with photographs and a plain list of what needs doing now and what should be watched, for the homeowner to keep.
Leak Diagnosis and Flashing Repair
Following the water from the stain to its real source, repairing the flashing or the shingle line that failed and writing down the cause.
Roof Repair
Finding the source of the leak or the damaged section, repairing it properly and writing down what was done so the next storm can be checked against it.
Guides
Read before you book
What Moves the Cost of a Roof Replacement in Hempstead
No honest price list exists for a roof replacement in Hempstead, because two roofs of the same size can need very different work.
Ice Dams on Hempstead Roofs: How They Form and How to Stop Them
An ice dam is a ridge of ice at the eave that holds back melting snow, so water backs up under the shingles and into the house.
FAQ
Attic Ventilation and Moisture Check FAQs
Will better ventilation stop ice dams completely?
It reduces the melt that forms them, and it is the most important part of the fix. Air sealing and insulation also help, and the note sets out the order.
Why is my attic damp?
Usually warm, moist air from the house is leaking into the cold attic, or the ventilation is blocked. The check finds the source.
Do I need to add insulation?
The roofer checks the depth and recommends a change if it is needed. The insulation should not be compressed or blocking the soffit vents.
Is a check in the attic expensive?
The phone team gives an estimate when the visit is booked. The price is confirmed on site before any work begins.
Will a bathroom fan affect the attic?
A bathroom fan that vents into the attic rather than outside adds moisture to the attic. The roofer checks where the fan exhausts, and the note records any fan that needs to be re-routed.