Double-Hung Window Replacement in South San Francisco

Clarify whether the proposal replaces the sashes, installs an insert or removes the complete frame. Ask which balances, locks and other hardware are included and whether any existing components remain. Agree on the finishing scope and a completion check covering the operation of both sashes and the selected tilt features, where fitted.

Discuss double-hung frame, upper sash, lower sash, balances, meeting-rail lock, weather seals, installation trim. Ask the provider to distinguish existing parts to inspect, proposed replacements, and tools, materials or reports included in the service. Request a reason for any replacement and confirm compatibility with your equipment. A list of possible items does not mean that every item must be supplied or replaced.

A sticking panel can involve rollers, track damage, alignment or worn seals. Ask which condition was observed and whether compatible parts are available. A sound frame may remain in place for a targeted repair; deterioration at the sill or frame can change that scope. Compare the actual findings before choosing a complete replacement.

Moisture between the panes is different from condensation on a room-facing surface. A proposal may replace the sealed glass unit while retaining a suitable sash and frame. Ask which component has failed, how the replacement glass is specified and whether the existing frame can support the work.

An insert retains a suitable existing frame and places a replacement unit within it. Full-frame work removes more of the assembly and exposes the opening for assessment. Compare retained materials, flashing work, trim restoration and the resulting clear opening rather than treating both proposals as the same job.

Compare the ratings for the complete product and its suitability for the local climate and project. U-factor and solar heat gain coefficient describe different aspects of performance. Ask which specified unit the label describes; a generic brochure does not establish the rating of the product being supplied.

Describe the opening, how it moves and what changed. Note whether a concern is with glass, the moving panel, hardware or the surrounding wall. If available, gather product labels, earlier invoices and photographs taken without dismantling the assembly. Explain access restrictions and keep people away from broken glass.

Ask which units and components are included, what remains in place, how access and removal are handled, and who restores affected finishes. Confirm product specifications, disposal, weatherproofing and completion checks. Any concealed damage discovered during the work needs an explained change to the agreed scope.

Yes. Marvin describes double-hung windows with two operable sashes that move vertically. Have the proposed upper and lower sash operation demonstrated, including access to their controls at the intended location. A similar-looking product drawing does not replace confirmation of the actual window type and configuration.

No. Andersen’s parts catalog distinguishes non-tilting Narroline windows from Tilt-Wash models and identifies different cleaning features by product. Confirm the exact proposed model and its cleaning instructions. If tilt-in access matters, have that feature recorded and demonstrated for the supplied configuration rather than assuming it from the double-hung label.

Ask which components the proposal supplies or retains. Andersen describes balances as the mechanisms holding sashes in position. Have the cause of drifting assessed and the proposed balances, liners and hardware listed; the phrase sash replacement does not define those details.

Ask for both sashes to be operated and returned to their closed positions, with the meeting rails and supplied lock checked together. Have any uneven meeting point, sticking or remaining adjustment recorded for follow-up. Keep the instructions for operation and any fitted cleaning features with the product record.