The $12,000 Windows and the $4,500 Attic
The homeowner of a 2,200 ft² 1989 colonial has a $12,000 quote to replace all 14 double-pane vinyl windows, installed in 2004, and wants you to confirm that windows are why the living room is drafty and the second floor is cold. Your blower door reads 2,900 CFM50 (about 9.9 ACH50). Infrared scanning on a 28°F morning shows cold bands at the basement rim joist along the front wall, at the uninsulated plywood attic hatch, and at top plates in two second-floor bedrooms; the windows show edge-of-frame cooling but no failed seals except one fogged unit. The attic has R-19 and a bath fan discharging directly into it, with visible dark staining on the sheathing around the fan discharge. The budget is $12,000 total, one spouse has asthma, and the client says, 'I'd rather do it all at once - can you just tell me the windows are the problem?'
1. How do you open the conversation and answer honestly? Name the evidence you would put in front of the client and the language you would avoid.
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Open by validating the observation. The living room is drafty and the second floor is cold - that is real, and the windows are a visible suspect. Then move to what the measurements show, without disparaging the window contractor, who quoted what the client asked for.
Evidence to put on the table.
- The blower door: 2,900 CFM50, about 9.9 ACH50 - on the leaky side for a 1989 house, which means the shell, not the glass, is where the air is moving.
- IR images with temperatures: rim joist, hatch, top plates. Explain stack effect - in winter the house pulls air in low and pushes it out high, so the draft felt at a window is often air crossing the room toward a leak at the top plate.
- Window condition: 13 of 14 units have intact seals, and the frames show only normal edge cooling. One is fogged.
- A side-by-side estimate: air sealing plus attic insulation in the $4,000–5,000 range versus $12,000 for windows, stated as modeled ranges with assumptions, never as a guaranteed percentage.
Language to avoid: 'your windows are fine,' 'that contractor is wrong,' and any promised savings figure. Use: 'here is what the measurements say, and here is what I would do in what order.' Offer to price the one fogged unit as a line item - that honors the original request instead of dismissing it.
2. Build a prioritized scope inside the $12,000 budget, with rough costs and the reason for the order. Where do the asthma and the staining fit?
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Scope, in order.
- Bath fan to the exterior and mold treatment on the sheathing ($350–500 for the duct and termination; $600–1,200 for assessment and treatment by a qualified contractor). Not deferrable: the fan is dumping moisture into a cold attic, the staining is a moisture indicator, and one occupant has asthma. Do it before anything that changes attic pressure or buries the problem under new insulation.
- Air sealing plus attic insulation to about R-49 ($4,000–4,800): top plates, rim joist, wiring and plumbing penetrations, and a gasketed, insulated, latched hatch cover. This is the measure the blower door and the IR both point at, and sealing must precede insulating.
- Door weatherstripping and sweep, band joist sealing in the basement ($300–500). Cheap, quick, and consistent with the diagnostics.
- Replace the single fogged window unit or sash ($500–800). Meets the original concern without re-doing 13 sound units.
- Hold the remainder for the HVAC assessment or basement air sealing once the first four are done and re-tested.
Framing. Present it as a prioritized list rather than a complete package, ordered health and safety first, then what the diagnostics support, then cost-effectiveness. Give a written table with cost, expected effect, and confidence, and be explicit that the leftover budget exists.
3. The client says, 'Skip the fan work this year - I'll just keep the bathroom window open. Put the money into the windows.' How do you respond, and what goes in the report?
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Respond directly. The fan is not a comfort upgrade; it is the source of the moisture that is staining the sheathing, and mold in the attic is an asthma trigger for the person in the house. An open bathroom window in February is not a ventilation strategy - it does not dry sheathing that is already wet, and it makes the bathroom cold enough that the family will stop doing it by January.
Offer the low-cost interim. Re-route the existing fan to a gable or soffit termination with an insulated, backdraft-dampered duct and a proper cap - often a few hundred dollars - and schedule the mold treatment and the permanent roof termination. Put a date on it rather than leaving it open-ended. This keeps the project moving without leaving the moisture problem active.
In the report. Describe the condition, the blower door and IR results, and the recommendation in writing. Note explicitly which items the client declined and why, so the record shows the finding was reported and the decision was informed. Do not soften the finding to preserve the sale, and do not reclassify the fan as a comfort item to make it easier to defer. If the client still declines, document the unresolved moisture and IAQ condition and any program or contract obligation that follows from it.