Door frames are typically fixed to walls using metal fasteners called holdfasts (or wall ties) embedded in the masonry and then covered with trim.
Here's a breakdown of the process:
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Holdfasts (Wall Ties): These are metal straps or anchors attached to the door frame during installation. They are strategically placed on each side of the frame, typically with around three holdfasts per side.
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Installation: When the door frame is positioned within the wall opening, the holdfasts extend outwards and are embedded into the surrounding wall structure (brick, concrete, or stud).
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Securing the Holdfasts: The holdfasts are physically anchored within the wall. In masonry walls (brick or concrete), this often involves embedding the holdfasts in mortar between bricks or within poured concrete. In stud walls, they might be nailed or screwed directly to the wooden studs.
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Mortar/Fixing Compound: Mortar (for brick/concrete walls) or appropriate screws/nails (for stud walls) are used to firmly set the holdfasts and, consequently, the door frame in place.
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Shimming and Leveling: Shims (thin pieces of wood or plastic) are used to ensure the door frame is perfectly level and plumb before the holdfasts are permanently secured. This ensures the door will open and close smoothly.
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Finishing: Once the frame is secure, any gaps between the frame and the wall are filled with expanding foam or mortar. Finally, trim or molding is applied to cover the holdfasts and create a finished, aesthetically pleasing appearance.
