Mortex Products F4 Weatherstrip Caulking Cord 45 Ft

Product Description

The MORTEX PRODUCTS F4 is a pliable weatherstrip and caulking cord designed to seal gaps around windows, doors, and other building envelope penetrations. Sold in a 45-foot roll and weighing 0.672 pounds, this gray cord applies by hand without tools or cartridge guns. Installers press it directly into gaps and seams where it conforms to irregular surfaces and holds without adhesives. Beyond window sealing, it functions as a gasketing material, sound deadener, insect barrier, crack filler, and general gap filler in residential and light commercial applications.

The F4 caulking cord is suited for residential weatherization work on single- and double-hung windows, casement windows, sliding doors, and similar framed openings. It is commonly applied during seasonal weatherproofing to reduce air infiltration. The gray color blends with standard window frames and sill finishes. Because it is removable and leaves minimal residue, it is also used in temporary or seasonal installations where a permanent sealant is not required.

Key Features

• 45-foot roll provides sufficient coverage for multiple windows or door frames in a single package
• Hand-applied without caulking gun, cartridge, or special tools
• Pliable cord conforms to irregular gaps and uneven surfaces
• Functions as weatherstrip seal, gasketing material, sound deadener, and insect barrier
• Removable and repositionable — suitable for seasonal or temporary applications
• Gray color blends with standard window frame and sill finishes

Compatibility

Designed as a general-purpose weatherstrip and caulking cord for use on residential windows, doors, and framed building openings where a hand-applied, removable gap sealant is appropriate.

Installation Notes

Installation requires no special trade license, but is commonly performed by weatherization contractors, general contractors, and knowledgeable property maintenance staff. Clean the surface of dust, oil, and loose material before applying the cord to improve adhesion and sealing performance. Press the cord firmly into the gap using fingertip pressure, working in continuous runs to avoid gaps in coverage. Do not paint over the cord, as this may affect removability and surface condition.

Technical Specifications

• Length: 45 feet
• Color: Gray
• Weight: 0.672 pounds
• Unit of Measure: Each
• UPC: 00038092810948

Standard Information

• Brand: MORTEX PRODUCTS
• Manufacturer Part Number: F4