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To calculate the height of each wood pier post for a DIY shed, the Ask the Builder video uses an optical builder’s level and elementary arithmetic. The published description confirms the tool and the general approach, but it does not provide the instrument readings, reference elevation, equation, or worked example. Therefore, use the original Ask the Builder video for the exact field sequence rather than relying on a reconstructed calculation.
This guide explains what the source establishes, how to prepare for the calculation, how to record the video’s readings accurately, and how to keep post heights and leveling tolerances separate from local foundation and building-code requirements.
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1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsWhat does the Ask the Builder shed-post video actually teach?
The video addresses a specific layout problem: determining how high each wood support post should extend beneath a shed’s beams. Ask the Builder describes it this way: “Tim Carter demonstrates how easy it is to calculate how high each wood support post should be using an optical builders level and simple grade school math.” That wording appears in the publisher’s page description; it is not a transcript of a spoken sentence.
The publisher’s YouTube listing dates the video to April 7, 2016. It is one installment in Ask the Builder’s wood-post-and-beam shed series, which contains 16 videos. The series places the height-calculation lesson after “Shed Builder’s Level 101” and before videos about notching and cutting posts. That sequence matters: post heights have to be established before the later cutting work can be done safely.
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The accessible page text does not state the level setup, the staff or rod readings, the benchmark or reference point, or the arithmetic used in the demonstration. Any article that supplies those missing numbers as though they came from Carter’s video would be guessing.
Why is post-height calculation different from simply making the piers level?
Leveling establishes a common elevation. Calculating post heights uses that elevation information to determine how much of each post must remain above its support so the beams can be installed at the intended height. A pier can be positioned correctly while the exposed post is still the wrong length, and a post can be cut to a convenient length without producing a level beam line.
An optical builder’s level creates a horizontal line of sight. Readings taken from a common setup can be compared, and their differences can be converted into relative elevations. The general surveying principle is straightforward; the important project-specific details are the reference chosen, the locations measured, and the arithmetic convention used. The indexed video description does not disclose those details, so copy them from the video or the project plans rather than substituting an assumed formula.
What should you have ready before following the calculation?
Gather the information and equipment that the full demonstration or your shed plans require. The source names the optical builder’s level; it does not publish a model, brand, accessory list, or specification.
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- Shed plans and pier layout: Mark every pier and post location, the beam lines, and the intended finished-floor or beam elevation.
- An optical builder’s level or transit: Set it on a stable point where the relevant locations can be viewed without repeatedly moving the instrument.
- The matching measuring staff or rod: Confirm the type and graduations required by the instrument and the video before taking readings.
- A written worksheet: Give every post a permanent identifier. Record the reference reading, each post reading, the calculation, the resulting height, and the later verification.
- A way to mark posts: Use a durable pencil or marker and mark the post ID and the calculated cut or beam line only after checking the arithmetic.
- Site and safety information: Check local footing depth, frost protection, uplift, bracing, treated-wood, and permit requirements. The video is instructional material, not project-specific engineering or code approval.
If a particular item is not visible in the original video or called for in your plans, do not assume that a substitute produces the same result. The source does not compare optical levels with other instruments or publish comparative accuracy, cost, or ease-of-use data.
How should you use the optical level without inventing a reading?
Use the following as a verification workflow for watching and documenting the demonstration, not as a claim that these are the video’s undisclosed readings.
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- Identify the reference. Pause when the video establishes its starting elevation or reference point. Write down exactly what is being treated as the reference and what units are shown.
- Identify the instrument setup. Note where the level is placed, how the sight line reaches the measuring staff, and whether the setup is kept fixed for all posts or moved during the demonstration.
- Transcribe every reading. Record the reading and the location together. A number without a post ID or reference point cannot be safely reused later.
- Copy the arithmetic exactly. Capture the order of subtraction or addition, the sign convention, and the unit conversion, if any. Do not replace the displayed equation with a remembered “standard” equation.
- Apply the result to the correct post. Transfer the calculated height or mark to the post identified in the same step. Check that the mark refers to the intended beam or finished-floor reference, not merely the top of the concrete pier.
- Repeat and cross-check. Re-read the video and compare your worksheet with the displayed values. If a reading, unit, or reference is unclear, pause the calculation rather than filling in a plausible value.
- Verify the physical layout. Before cutting or notching, confirm that post IDs, pier locations, beam lines, and the intended high and low points agree with the plans.
This approach preserves the useful part of the lesson—using measured differences and simple arithmetic—without pretending that the web-page summary contains a transcript.
What accuracy target does Ask the Builder give for leveling the posts?
In related guidance on getting shed posts level, Ask the Builder says the goal is a maximum leveling error of no more than 1/8 inch and says an optical level makes it easier to bring the wood posts within that margin. That figure belongs to the related leveling guidance, not to an accessible transcript of the height-calculation video.
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Treat 1/8 inch as Ask the Builder’s practical target for that guidance, not as a universal engineering tolerance or a building-code requirement. Your local authority, structural plans, engineer, or manufacturer may specify a different tolerance. If the project is in a frost, seismic, high-wind, or heavily loaded location, leveling accuracy is only one part of the foundation design.
What commonly goes wrong when calculating post heights?
Most errors come from losing the reference or transferring a correct number to the wrong physical point. Use these checks before accepting a result:
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- Unstable instrument: A tripod or setup that shifts changes every subsequent comparison. Re-establish the setup and repeat the readings if the instrument is disturbed.
- Mixed reference points: A reading taken from a pier top, post top, beam seat, and finished-floor mark are not interchangeable. Label the surface represented by every reading.
- Post IDs lost in the worksheet: Similar-looking posts can be swapped. Mark each post and keep the physical mark synchronized with the written ID.
- Sign or unit mistakes: A reversed subtraction can turn a taller post into a shorter one. Write the units beside every value and have another person independently check the arithmetic.
- Arithmetic treated as a design decision: The calculation tells you a relative height; it does not determine footing size, reinforcement, beam span, connection hardware, or whether the proposed elevation meets code.
- Cutting too soon: Do not notch or cut posts until the reference, reading, calculation, and physical mark have all been checked against the plans.
If two readings do not make sense together, stop and resolve the discrepancy. A neat-looking row of marks is not evidence that the underlying reference was correct.
How does this lesson fit into the rest of the shed build?
Ask the Builder’s wood-post-and-beam series presents 16 videos in sequence. The height-calculation video follows the builder’s-level introduction and precedes post-notching and post-cutting lessons. That order reflects a practical dependency: establish the elevation relationship first, then modify the posts to suit the beam system.
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The series page and the video page also link to plans for the shed shown. The existence of those plans is documented, but current availability, pricing, and any referral arrangement are not established by the source material. Use the plans as a project reference only after confirming that they match your site, dimensions, loads, and local requirements.
What information is missing from the published summary?
The indexed text does not reveal:
- the instrument model or specification;
- the exact tripod or sight-line arrangement;
- the measuring staff or rod type;
- the benchmark or reference elevation;
- any staff readings;
- the equation shown on screen;
- a worked numerical example;
- the number of setups or checks used in the demonstration; or
- whether the shown shed dimensions apply to your project.
Those omissions are why the original video itself is the authoritative place to obtain the demonstration’s exact sequence. The Ask the Builder article page supplies the topic and method summary, while the related post-leveling page supplies the separate 1/8-inch practical target.
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Can a worksheet make the calculation easier to audit?
Yes. Use a blank table and fill it only from the video, your plans, and your own recorded measurements:
| Post ID | Location | Reference description | Level reading | Video’s equation/result | Mark transferred? | Independent check |
|---|---|---|---|---|---|---|
| P-01 | Plan location | Describe the exact reference surface | Record units | Copy, do not infer | Yes/no | Initials/date |
| P-02 | Plan location | Describe the exact reference surface | Record units | Copy, do not infer | Yes/no | Initials/date |
Keep the worksheet with the plans. If a post is replaced, a beam line changes, or the instrument is reset, the record shows which measurements must be repeated instead of relying on a mark whose origin is forgotten.
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What should you confirm before construction continues?
Confirm that every calculated mark is tied to the same project reference, that all post IDs agree with the plan, and that the resulting beam elevation is compatible with doors, floor framing, drainage, and the intended finished grade. Then check the foundation and connection details against local code or project-specific engineering. The Ask the Builder material explains a measuring approach; it does not approve a foundation design for every site.
Frequently Asked Questions
Can I use a laser or water level instead of an optical builder’s level?
The reviewed Ask the Builder pages name an optical builder’s level or transit and do not compare it with laser or water levels. Using another instrument may require a different procedure and accuracy check, so follow that instrument’s instructions or obtain project-specific guidance rather than assuming the video’s arithmetic transfers unchanged.
Is the 1/8-inch figure a building-code requirement?
No universal code requirement is established by the cited material. The 1/8-inch maximum error is a practical target stated in Ask the Builder’s related post-leveling guidance; verify the tolerance required by your local authority, plans, or engineer.
Where can I watch the original shed-post calculation demonstration?
The source’s YouTube listing is available at Ask the Builder’s DIY shed wood-post height video. Watching it is necessary if you need the actual setup, readings, and equation, because those details are not included in the indexed page description.
Does the video include a complete shed plan?
The Ask the Builder topic page links to plans for the shed shown, and the wood-post-and-beam series also presents the lesson in context. The reviewed sources do not establish current plan availability or whether the plans suit your site, so confirm both before relying on them.
