Old Gable Louvers and a New Ridge Vent in Skaneateles
Two openings high up on a roof will talk to each other and ignore the eaves, which is how an attic can gain a vent and lose its ventilation.
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What a gable louver does to a ridge vent
In Skaneateles village the median year of construction is 1938. Of 1,353 housing units, 54.3 percent were built in 1939 or earlier, 61.2 percent before 1950, 82.5 percent before 1980 and 17.5 percent in 1980 or later. 73.0 percent are single-family detached and 75.5 percent of occupied units are owner occupied.
Source: US Census Bureau, American Community Survey 2020-2024 5-year estimates, tables B25034 year structure built, B25035 median year structure built, B25024 units in structure and B25003 tenure, accessed 2026-09-14
The Department of Energy guide states that gable end vents should not be used together with ridge or off-ridge vents, because the gable vents are likely to short-circuit attic air flow and can render soffit venting ineffective.
Source: US Department of Energy, Building America Solution Center, Pacific Northwest National Laboratory, accessed 2026-09-14
Skaneateles village has 1,353 housing units, 73.0 percent single-family detached and 9.8 percent in three and four unit buildings, with 75.5 percent owner occupancy and a median build year of 1938. The Town of Skaneateles around it has 3,492 units with a median of 1956, 36.6 percent pre-1940 and 83.1 percent detached.
Source: US Census Bureau, American Community Survey 2020-2024 5-year estimates, tables B25034 year structure built, B25035 median year structure built, B25024 units in structure and B25003 tenure, accessed 2026-09-14
Why two high openings leave a Skaneateles attic still
Adding a vent can subtract ventilation, and this is the way it happens. The Department of Energy's guidance states plainly that gable end vents should not be used together with ridge or off-ridge vents, because the gable openings are likely to short-circuit the airflow and can render soffit venting ineffective. Air takes the short path between the two high openings, the eave bays stop moving air at all and frost accordingly, and the ridge looks perfect from the street. In Skaneateles village the ingredients are everywhere: 54.3 percent of the housing was standing in 1939 or earlier, an era of gable louvers, and most of those roofs have been recovered at least once since ridge vents became standard.
Deciding what to close and what to open
This one is usually cheap to correct and it does need deciding rather than guessing. Where a continuous ridge vent has been fitted and the soffits are open, closing the old gable louvers restores the intended path from eave to ridge. Where the soffits are blocked or were never vented, closing the louvers first would leave the attic with exhaust and no intake, which is worse, so the intake has to be opened in the same visit. On a village house with 73.0 percent of units detached and a 1938 median, the soffits are frequently the original boarded construction with no opening in them at all, so the sequence matters.
Check the soffits before closing the louvers
Removing a high opening only helps if there is intake at the eaves to replace it. Closing both ends of the path is the way to make things worse.
Look for frost near the eaves
A short-circuited attic frosts at the bottom of the roof while the ridge area looks clean. That pattern is the signature of this fault.
Treat it as one piece of work
Opening intake and closing the gable louvers belong in the same visit, so the attic is never left with exhaust and nothing feeding it.
Tell us what is on the gables and the ridge
Louvers, a ridge vent, or both. We arrange an insured contractor who fixes the path rather than adding to it.
Related attic and roof work in Skaneateles
Ventilation questions from Skaneateles homeowners
The gable louvers are original. Should they really be blocked up?
If the roof now has a continuous ridge vent and the eaves are open, then yes, functionally, and it can be done in a way that leaves the exterior appearance intact. Blocking the opening from inside keeps the louver visible on the gable while stopping it short-circuiting the airflow. That matters on an older house where the detail is part of the building.
How do I know if my soffits are vented at all?
Look up at the underside of the eaves from outside for slots or perforations, then confirm from inside the attic that the bays behind them are clear. Original boarded soffits on a prewar house often have no opening whatever, and in that case the intake has to be created before anything at the top of the roof is changed.
Get the airflow going the right way
Send the Skaneateles address and a photo of the gable end. No obligation, and this is often an inexpensive correction.