Identify the specified sealing product.
Ask the installer which material is intended for the actual frame and opening. A can described broadly as expanding insulation does not identify compatibility with the selected window.
Windows · Hamilton, Washington
Window replacement in Hamilton should include a question about the material used around the new frame. Expanding foam is not interchangeable: an unsuitable product can push on a frame and interfere with window operation.
Ask the qualified installer to identify the air-sealing materials appropriate to the selected window and installation. Include a demonstration of opening, closing and locking the completed unit in the handover.

Window replacement
Have the provider select compatible perimeter materials using the actual window and sealant instructions. The homeowner’s role is to request that specification and observe the finished operation, rather than choose a generic foam or attempt to correct a tight sash by adjusting the installation.
Ask the installer which material is intended for the actual frame and opening. A can described broadly as expanding insulation does not identify compatibility with the selected window.
Have the provider check the window and sealing-product directions together. Low-expansion wording alone does not approve every product or every application.
Ask the installer to demonstrate the sash and lock after completion. Report binding or a changed operating feel for assessment instead of assuming it proves one particular cause.
Before work begins
Ask the Town which current residential requirements apply to the replacement and any associated wall or opening changes. Describing the air-sealing product does not replace a clear account of the construction work.
A difficult sash can have several causes. Have the qualified provider assess the installed window; this guide does not diagnose frame distortion or provide a foam-removal or adjustment procedure.
Have the installer verify the actual material against the window and sealing-product requirements.
Report the symptom and have the installed assembly assessed; operating difficulty alone does not identify its cause.
A demonstration of normal opening, closing and locking, with the installed product information retained.
Share the opening list and existing operating concerns so compatible installation materials and the handover can be addressed.