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After sewing the structural seam of a facing, it must also be under-stitched to prevent it rolling to the outside. Under-stitching is done close to the seam line, attaching the facing to the seam allowance. A facing can also be used decoratively by applying it from the inside, allowing it to be turned to the outside as a contrasting piece.
Seam sealants are sprayed or extruded over the joined edges of these overlaps, and they then either cure to a flexible waterproof "seal" by drying (dehydrating) in the case of water borne compositions, or thermoset irreversibly to a flexible adherent seam seal by going through an oven bake in the case of plasticized polyvinylchloride compositions.
Seam allowance (sometimes called inlays) is the area between the fabric edge and the stitching line on two (or more) pieces of material being sewn together. Seam allowances can range from 1 ⁄ 4 inch (6.4 mm) wide to as much as several inches. [1] Commercial patterns for home sewers have seam allowances ranging from 1 ⁄ 4 to 5 ⁄ 8 inch (6. ...
A plain seam is the most common type of machine-sewn seam. It joins two pieces of fabric together face-to-face by sewing through both pieces, leaving a seam allowance with raw edges inside the work. The seam allowance usually requires some sort of seam finish, usually an overlock in ready to wear or bias tape in couture sewing, to prevent ...
A garment described as waterproof will have a water-repellent coating, with the seams also taped to prevent water ingress there. Better waterproof garments have a membrane lining designed to keep water out but allow trapped moisture to escape (" breathability ")—a totally waterproof garment would retain body sweat and become clammy.
Waterproof fabrics are fabrics that are, inherently, or have been treated to become, resistant to penetration by water and wetting. The term "waterproof" refers to conformance to a governing specification [ 1 ] and specific conditions of a laboratory test method .
Durable water repellents are commonly used in conjunction with waterproof breathable fabrics such as Gore-Tex to prevent the outer layer of fabric from becoming saturated with water. This saturation, called 'wetting out,' can reduce the garment's breathability (moisture transport through the breathable membrane) and let water through.
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