Official build guide · 9 steps · 10–15 minute read

How to build
a Lok-N-Blok wall.

Everything a two-person crew needs to frame a wall — planning, starter block, horizontal & vertical interlock, corners, T-connections, interior chases for utilities, cuts, and the tension-rod precompression that lets the wall survive 250 mph winds. Source: Lok-N-Blok engineering drawings, verbatim.

Why Lok-N-Blok walls

  • Lightweight — ~6.2 lb per block, 90% lighter than concrete
  • Strong — over 10× stronger than concrete in compressive & tensile strength
  • Resistant — fire, water, UV, mold, termites
  • Field-modifiable — cuttable along grooves for halves / quarters / trims
  • Interlocking — snap-fit dovetail + post/receiver geometry
  • Reusable — disassemble and rebuild; nothing goes to landfill

Block dimensions at a glance

MeasurementNominalActual
Length12"12-3/32"
Width8"8-1/32"
Height6"6-1/16"
Weight~6.2 lb per block

When constructed, there is an additional 1/32" at each horizontal and vertical connection (the interlock tolerance). Design walls in multiples of 6-1/16" (height) and 8-1/16" (length) to minimize block cutting.

Steps
01 Plan your wall 02 Place the starter block 03 Connect horizontally 04 Complete a course 05 Stack vertically 06 Corners & T-connections 07 Route utilities (chases) 08 Block alterations 09 Tension the wall
01

Plan your wall

Before you place a block, sketch the plan view, elevations, and isometrics. The blocks align on a 4px-grid-of-masonry — every multiple of the base dimensions snaps together without cuts.

  • Design walls in lengths that are multiples of 8-1/16" and heights in multiples of 6-1/16" to minimize cutting.
  • Establish plan view, elevations, and isometric sketches before production.
  • Use dovetail inserts (small back-to-back male dovetails) when joining two blocks where female edges align.
Tip: The nominal 12"×8"×6" block rounds up to 12-3/32"×8-1/32"×6-1/16" in actual measure. Always use the actual dimensions when CAD-planning large walls.

Block anatomy — top view

Post Post Post Post Post Post Post Post ■ ■ ■ ■ ■ ■ ■ ■ <— 8 square posts (align with receivers above) ┌──────────────────────────────────────────────┐ │ Female Bowtie Transverse Longitudinal │ │ Dovetail Cutout Web Web │◀── Male └──────────────────────────────────────────────┘ Dovetail Sidewall Sidewall Groove Groove
Top: 8 posts snap into the receivers of the block above. Sides: 3 female dovetails (tapered for snug fit). End: 1 male dovetail for the next-block connection.
02

Place the starter block

Every course begins with one starter block. Orient it so its female dovetail end faces the direction of construction. The next block's male dovetail slides in from above.

  • Place the first (starter) block with its exposed female end in the direction of construction.
  • At corners, leave 6-1/16" space from the corner edge — this is where the perpendicular corner block returns.
Remember: the direction of construction determines every subsequent placement in the course. Pick it deliberately. Most builders go left-to-right along the longest wall first, then turn corners.
direction of construction → Block 1 (starter) Block 2 slides in from above ┌─────────────┐ ⇩ │ ♀ ♂ │ ┌──────┴──────┐ │ ◉ ◉ ◉ ◉ ◉ │ → │ ♀ ♂ │ └─────────────┘ └─────────────┘ female end faces male dovetail slides into starter's the construction female dovetail from above
Starter block with exposed female end + next block's male dovetail sliding down from above.
03

Connect blocks horizontally

With the starter down, every subsequent block in the course slides into place from above. Male dovetails engage female dovetails. The taper creates a snug, self-aligning fit — no mortar, no shimming.

  • Slide male dovetails into female dovetails from above — not laterally.
  • Continue until you complete the course.
  • For female-to-female connections (two blocks with female edges meeting), use a dovetail insert — a small back-to-back male piece that locks into both sides.
Why slide down, not lateral? The dovetail geometry locks mechanically on vertical insertion. Sliding sideways would require forcing the joint, which could damage the interlock.
04

Complete a course

To close a course (a complete horizontal ring of blocks), connect the last block to the starter. Depending on geometry, you may need to lift the starter slightly to slide the final block's dovetails into place.

  • Lift the starter block slightly so its male dovetail can slide down into the final block's female dovetail.
  • Alternative: use dovetail inserts to join the two female dovetail ends instead of lifting anything.
Safety: if you're lifting a block that's already supporting weight (in a taller build mid-course), use the dovetail-insert method instead. Never hoist a weight-bearing element.
05

Stack vertically — in running bond

To stack a new course on top of the one below, align the receivers on the underside of the new blocks with the posts on top of the blocks below. The 8-post / 8-receiver pattern self-aligns.

  • Each new course can be placed in either direction (left-to-right or right-to-left).
  • Alternate direction course-to-course to minimize block modifications at edge walls (e.g., removing posts at the top row).
  • Recommended pattern: running bond — offset each course by a half-block so joints are staggered. Based on structural testing, running bond is required over stacked bond for load-bearing walls.
Running bond (staggered) vs. stacked bond (aligned): running bond resists shear and distributes load across courses, exactly like traditional masonry. Stacked bond is only acceptable for non-structural decorative walls.
Running bond (correct — staggered joints) ┌─────┬─────┬─────┬─────┬─────┐ │ │ │ │ │ │ course 3 ├──┬──┴──┬──┴──┬──┴──┬──┴──┬──┤ │ │ │ │ │ │ │ course 2 (offset ½ block) ├──┴──┬──┴──┬──┴──┬──┴──┬──┴──┤ │ │ │ │ │ │ course 1 └─────┴─────┴─────┴─────┴─────┘
Every course is offset half a block. No vertical joint runs more than 2 courses.
06

Corners & T-connections

Lok-N-Blok makes right-angle corners without any special blocks. Rotate a block 90° at the corner; the dovetails engage as they always do.

  • Corners: rotate the corner block 90° and interlock the dovetails. If the corner joint is female-to-female, use a dovetail insert.
  • T-connections: slide the male dovetail from the perpendicular block into the sidewall female dovetails of the main wall. Alternatively, use dovetail inserts to connect an endwall with female dovetails to the sidewall of a block.
Acute and obtuse angles: walls that aren't 90° require cutting blocks on a miter. The composite cuts cleanly with a standard carbide-tip saw.
07

Route utilities through interior chases

Every Lok-N-Blok has built-in raceways for plumbing, electrical conduit, low-voltage, and structural reinforcement. You don't drill through the wall — you plan your run before you stack.

  • Horizontal interior chase: continuous groove running lengthwise through each block — install utilities along the entire course.
  • Vertical interior chase (vertical cavities): column channels that extend floor-to-ceiling — ideal for conduit, reinforcing rods, tension rods, and risers.
  • Plan every run before construction. Threading conduit mid-stack is slow; threading before is seconds per course.
What goes in a chase: Romex / conduit · PEX / copper plumbing · data + coax · rebar / tension rods · insulation fill (for exterior walls).
08

Block alterations

Blocks can be cut on-site. Grooves in the block geometry mark the natural cut lines; halves and quarters come out clean with a standard carbide saw.

  • Half blocks for window/door openings and edge-course alignment.
  • Quarter / three-quarter blocks for corner offsets and running-bond alignment.
  • Post removal on the top course (removes posts where a double top plate will sit) — cut along the marked groove.
  • Dovetail removal at edge walls where no next-block connection is needed.
Safety: wear eye protection and a respirator — composite cutting generates fine particulate. Cut outdoors or with dust collection.
09

Tension the wall — the precompression that makes 250 mph possible

Lok-N-Blok walls are reinforced with tension rods that run vertically through the vertical interior chase. Once the wall is stacked, the rods are tightened at the top with a precompression assembly (spring + bearing plate + nut). This turns a stack of interlocked blocks into a single structural element.

Rod spacing & embedment

SpecValue
Tension rod spacingevery 4 blocks (≈ 4 ft, 4'-0½" max)
Embedment — slab-on-ground with turned-down footingminimum 8"
Embedment — stem wall foundationminimum 21"
Top plate (standard)double 2×6 with hole at rod locations
Top plate (High Wind A — HW-A)triple 2×6, one splice max between rods
Grout cell detailgrout cell with tension rod + two adjacent cells each side
First rod placement at cornerfourth cavity from the end in the corner block
First rod placement in perpendicularsecond cavity from the end in the first perpendicular block
  • Remove posts from the top row of blocks (Step 8) so the top plate sits flush.
  • Thread the tension rod through the vertical chase and embed in the foundation per the spec above.
  • Install the double (or triple for HW-A) 2×6 top plate with pre-drilled rod holes.
  • Tighten the precompression assembly at the top — spring, bearing plate, nut.
  • The precompression preloads the wall so wind, uplift, and lateral loads push against a pre-stressed structure.
What the tension system buys you: hurricane wind ratings up to 250 mph, uplift resistance for high-wind zones, and lateral stability against seismic and impact loads. The stack-of-blocks becomes a single tensile-reinforced element.
┌── Wall pre-compression assembly (spring + bearing plate + nut) ║ ═══ double 2×6 top plate (hole at rod location) ║ ┌── POST removed on top row ║ ┌───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┐ ║ │ ■ │ ■ │ ■ │ ■ │ ■ │ ■ │ ■ │ ■ │ ■ │ ■ │ ■ │ course N ║ ├───┴───┴───┴───┴───┴───┴───┴───┴───┴───┴───┤ ║ │ │ course ... ║ │ ←── tension rod coupler (typ.) ── │ ║ ├───────────────────────────────────────────┤ ║ │ │ course 1 ║ └─────────────┬─────────────────────────────┘ ║ grout cell with tension rod (typ. — two adjacent cells each side) ║ ║ ◄── rod embedded in concrete foundation wall ║ (min 8" slab-on-grade, 21" stem wall) ════╩═══════════════ concrete foundation
Tension rod threads through the vertical chase, embeds in the foundation, tightens at the top. Every 4 blocks (≈ 4 ft).

Plan the layout. Start with the exposed female end. Slide blocks down from above. Complete the course. Stack the next course in running bond. Route utilities through the chases. Cut what you need to cut. Thread the tension rods. Tighten the top.

That's the whole wall.

Key benefits of a Lok-N-Blok wall

Strength

Pre-compression designed to handle high-wind and load requirements. Rated up to 250 mph sustained winds.

Speed

Faster installation than mortar-based masonry. No cure time. A two-person crew can frame a small structure in days.

Flexibility

Easy to adapt for custom openings, chases, and connections. Blocks cut cleanly on grooves.

Sustainability

Recyclable composite. Disassemble walls and reuse blocks in another build. No mortar waste, no demolition landfill.

Next step

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