Weaving Basics: Frame Loom and Backstrap Loom

How Weaving Works

Picture a fence. The fence posts run vertically — those are the warp. The horizontal rails between the posts are the weft. Each weft rail passes in front of some posts and behind others in an alternating pattern. The fence holds together because of that alternation.

Cloth is a very fine fence. The warp threads are stretched on the loom under tension. Each pass of weft weaves over and under alternating warp threads. The next pass uses the opposite alternation. The interlocking creates a stable fabric.

The loom's job is to maintain warp tension and provide a mechanism to quickly open the shed — the gap between alternating warp threads that the weft passes through. The simplest shedding device is just your fingers. A heddle rod or a rigid heddle makes the process repeatable and fast.

Building a Frame Loom

A frame loom is a rigid rectangular frame with a series of pegs or nails at the top and bottom edges to anchor the warp.

Materials:

• Two pieces of 1x2 or 1x3 lumber, 24 inches long (the top and bottom beams)
• Two pieces of 1x2 lumber, 18 inches long (the side rails)
• 1-inch nails or commercial weaving pegs, spaced 1/4 inch apart (for 8 ends per inch, a common weave density)
• Corner brackets or pocket screws for assembly

Warping the Frame Loom

Warping is threading the warp. It must be even in tension and straight across the full width.

Basic Shed and Weft Insertion

Creating the shed manually:

Pass a smooth, flat stick (the shed stick) over alternate warp threads: over 1, under 2, over 3, under 4, across the full width. Slide the stick to the side rails and turn it on edge — this opens a clear gap (shed) between the raised and lowered warp threads.

Pass your weft (wound on a simple stick shuttle or a card shuttle) through this open shed from one side to the other. Leave a small loop of weft at the entry side (this prevents draw-in — the gradual narrowing of the fabric as weaving progresses).

Remove the shed stick, beat the weft toward the already-woven section using a wide-toothed comb or a purpose-made beater.

Opening the second shed:

Use a pickup stick or your fingers to lift the threads that were lowered in the first shed — the alternate set. Pass the weft from the opposite direction.

This over-under-over-under pattern is plain weave. Every second pick, the shedding repeats.

Using a rigid heddle:

A rigid heddle is a slotted sheet where alternate warp threads pass through holes (held) and slots (raised or lowered with the heddle). Tilting the heddle up opens one shed, down opens the other. This speeds weaving significantly over manual shed picking.

Rigid heddles can be cut from 1/4-inch plywood: drill evenly spaced holes at 1/4-inch intervals across the center line of the board, and cut a slot between every other hole from the top edge down to the hole level. Alternate holes and slots across the full width.

Maintaining Even Selvages

The selvage — the left and right edges of the cloth — is where beginners struggle most. The common problem: draw-in, where each weft pass pulls the edges inward, narrowing the cloth over time.

Preventing draw-in:

• Angle the weft into the shed at about 30-45 degrees before beating, rather than passing it straight across
• Leave a loop of excess weft at the entering edge before beating
• Beat consistently — same force, same angle, every time

Uneven edges: One side pulling more than the other indicates uneven tension in the warp, or that you are handling the shuttle differently on opposite directions. Slow down, use the same technique on both directions, and check that warp tension is consistent across the full width.

The Backstrap Loom

The backstrap loom has been used across the Americas, Asia, and Africa for thousands of years. One end of the warp attaches to a fixed point (a post, a tree, a door handle). The other end attaches to a strap worn across the weaver's back. The weaver's body provides warp tension, adjustable by leaning back or forward.

Advantages: Completely portable, requires no frame construction, easily adjusted tension, produces very fine fabric with practice.

Backstrap loom components:

• Warp beam: A smooth stick attached to the fixed anchor point. One end of the warp wraps around it.
• Breast beam: A smooth stick the weaver holds or attaches to the backstrap. The other end of the warp wraps around it.
• Heddle: A series of string loops or a wooden heddle that controls alternate warp threads for shed opening.
• Shed rod: A stick woven through alternate warp threads (the first shed is permanent with this stick in place).
• Backstrap: A wide leather, canvas, or woven strap connecting the breast beam to the weaver's lower back.

Warping a backstrap loom: Warp between the two beams in a figure-eight pattern, creating natural crossed sheds at the heddle position. The permanent shed rod maintains one shed constantly. The heddle rod (with string loops around alternating threads) opens the opposite shed when pulled forward.

Finishing Raw Cloth

Cloth straight off the loom is raw. The weave is loose, the individual threads are visible, and the fabric feels rough. Finishing changes this.

Washing and fulling wool cloth: Wash the finished panel in warm water with gentle agitation. The wool fibers will bloom slightly and the weave will tighten. This is called fulling — a mild version of the felting process. The degree of fulling changes the drape and density of the fabric significantly.

Pressing: Press finished cloth with a hot iron (appropriate to fiber content) and a damp pressing cloth between the iron and fabric. This sets the weave and produces a more finished, flat surface.

Hem finishing: Raw woven edges fray. Fold and sew a hem, or apply a woven edge after the fact. The simplest raw edge treatment: fold under twice and stitch with running stitch in matching thread.

Practical Applications

A 15-inch wide panel loom can produce:

• Bag fabric: Two panels seamed together. 12-15 hours to produce enough fabric for a simple tote.
• Belt and strap: Narrow warp (2-3 inches) produces strong, flat textile for belts, suspenders, and straps.
• Blanket strips: Individual panels seamed together produce a full blanket. Labor-intensive but historically how blankets were made.
• Bandaging material: Loosely woven plain cloth in cotton makes serviceable bandaging when commercial supply is unavailable.