The Attic Hatch Is Part of Your Roof Inspection

Most homeowners picture a roof inspection as a walk across the shingles and a look at the gutters. The attic gets a glance if anyone thinks of it at all. In St. Louis that is a gap, because the attic is where a roof shows how it handles winter. Warm air leaking up from the house melts snow on the roof deck, the meltwater runs down to the cold eave, and it freezes there. The attic hatch is a common place for that warm air to get in, and it is small enough that many people never think to check it.

This page is for the homeowner who has an inspection booked, or is deciding whether to book one, and wants to know what the attic side of the visit should cover. It does not replace the roof surface check. It adds one more thing the inspector should look at before anyone tells you the roof is fine for another winter.

Why the hatch matters

An attic hatch is a square of drywall or plywood, often with weatherstripping that has been compressed flat for years. Around it there may be a gap where the frame meets the ceiling joists. Above the living space, the hatch is the lid on a box of warm, humid air. Every time someone goes into the attic, opens the hatch, and closes it again, the seal shifts a little. Pull-down stair hatches are often worse, because the frame is usually unsealed and the door is pushed up against a rough opening.

When warm, moist air gets into a cold attic, it does two things. It raises the temperature of the roof deck directly under the shingles, which can be enough to melt snow on a sunny afternoon even when the air outside is well below freezing. It also adds moisture, which condenses on the cold underside of the sheathing and the nails. Over a winter that can leave frost on the nail tips, then staining on the boards, then soft spots in the sheathing that show up as wavy shingles the following spring.

The hatch is not the only leak point, but it is a useful test. If the attic is cold and dry on a winter morning, the roof is probably being ventilated and insulated the way it was designed. If there is frost on the decking near the hatch, warm air is finding its way up.

Inspection

When your inspector goes into the attic, ask them to check four things before they leave the space.

1. The hatch itself. Is there weatherstripping, and is it still springy when pressed? Does the lid sit flat in its frame? Is there daylight at the edges when the attic light is on?
2. The hatch frame and the ceiling joists around it. Look for dark staining on the drywall edge below the hatch, which is a sign that moisture has been moving through the opening for a long time.
3. The underside of the roof deck near the hatch. Frost, white crystals on nails, or dark damp wood are all signs of warm air getting in. Ask the inspector to point to the exact boards.
4. The insulation next to the hatch. Insulation that is compressed, dirty, or pulled back from the joists lets more heat leak through, and dirty insulation often marks where air has been moving.

The inspector should be able to tell you in plain words what they found. If they say the attic looks fine without saying what they looked at, ask them to show you the deck near the hatch on their phone or on a sheet of paper. A written note with photos is what you want to keep.

Keys documents what we see in the attic the same way we document the roof surface: photos, measurements, and a written note you can keep. If you want to ask about the attic visit before booking, call our office at (314) 220-2333.

What it costs

Checking the attic hatch is normally part of the roof inspection visit, so it does not usually add a separate line to the bill. Sealing a hatch is a different matter. Weatherstripping kits are inexpensive, but fitting them takes an hour or two on a ladder, and a hatch with a warped frame may need a new lid or a new frame. Insulation work above the hatch can add cost if the insulation is old, wet, or compressed. Ask for those items to be listed separately, so you can decide each one on its own.

Be wary of a quote that bundles the hatch sealing into a large lump sum with no description. You should be able to see what is being done to the hatch, what material is used, and where the insulation will go. If the work is not written down, it is hard to check later.

What to ask

Before the attic visit, ask the following questions. The answers will tell you whether the inspector is looking at the attic as part of the roof or only walking through it.

• Will you check the attic hatch and the deck directly under the shingles near it?
• Will you photograph any frost, staining, or wet wood you find, and will I receive those photos?
• Will you check the insulation near the hatch and tell me whether it is compressed, wet, or missing?
• If the hatch is leaking air, what is the fix, and is it listed separately in the written scope?
• Will the written scope show the attic findings next to the roof findings, so I can see how they connect?

Listen for whether each answer names a specific part of the attic. A general statement that the attic is fine is not the same as a note saying the hatch seal was checked and found intact.

Timing before the freeze

St. Louis winters are not steady. A mild week in December can be followed by a hard freeze in January, and the freeze thaw cycle that comes with it is what stresses the roof deck and the eave. If an attic hatch has not been checked in several years, a fall visit is a sensible time to have it looked at, before the first long cold spell. A hatch sealed in October is easier to fix than one that is already producing frost on the nails in January.