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Explanation: Common products used in window-door installations.
Materials and shapes vary depending on individual circumstances but are typically round or flat made out of EVA and PVC Foams - Fluoroelastomer or Viton™ Sponge Rubber - Silicone Sponge - Nitrile-Vinyl-Neoprene and many more
Standard routine is typically a number of steps starting out with:
Outside - waterproof membrane followed by flashing.
Inside - Sponge stripping or expanding polyurethane foam in the gap between the window and framing followed by insulation and sealed with membrane. When gap is too small to allow for the above steps caulk can be used.