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The AHEP Adjustable Hip-End Purlin is a two-purpose connector for step-down hip trusses. Simpson Strong-Tie describes it as both a structural purlin and an installation lateral restraint or spacer: it can provide a surface for roof sheathing or decking while also spacing and supporting the flat portion of the top chord during truss erection. The product is described for wood and cold-formed-steel (CFS) applications. Its adjustment is intended to help the purlin line up with end-jack trusses as the framing runs from the eave toward the hip or peak. Historical pitch and fastener figures remain useful for understanding the product, but the current installation instructions and design literature must control a project specification.
What is the AHEP connector?
AHEP stands for Adjustable Hip-End Purlin. Simpson Strong-Tie currently lists it in its plated truss connector range. In plain language, it is an adjustable member installed at the hip end of a step-down hip-truss assembly. Its geometry lets the installer set the inner and outer tubes to suit the framing position, then secure the adjusted length.
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The important point is that “dual-purpose” describes two different functions, not two separate products:
| Function | What it does | When it matters |
|---|---|---|
| Structural purlin | Provides an attachment surface for roof sheathing or decking and helps maintain the intended framing line between the eave and the hip or peak. | When the purlin remains part of the completed roof framing and must be coordinated with the roof system’s design. |
| Installation lateral restraint or spacer | Spaces and supports the flat section of the top chord while trusses are being erected. | During erection, before the roof diaphragm and permanent sheathing can provide their designed restraint. |
Those roles should not be confused with an allowable-capacity rating. The sources reviewed for this article do not provide a current design-table capacity for every loading condition, span, pitch, or truss layout. Treat the AHEP’s structural role as a design item that must be checked against current manufacturer literature and the project engineer’s requirements.
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How does AHEP work on a step-down hip truss?
On a step-down hip roof, successive jack trusses reduce in length as they approach the hip. Their ends need a controlled line and spacing so the roof plane can be sheathed without abrupt offsets. The AHEP is adjusted to bridge the required distance and line up with those end-jack trusses.
As an erection aid, the connector supports the flat portion of the top chord and restrains it laterally while the trusses are being set. That temporary support helps keep the truss package in its intended position until the permanent roof framing and sheathing are installed. As a structural purlin, it gives the sheathing or decking a defined attachment surface and maintains the planned relationship between the truss ends.
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The adjustment is valuable because hip geometry varies with roof pitch, truss spacing, overhangs, and the exact step-down layout. Rather than cutting a one-off purlin for every location, the installer sets the AHEP to the required position, verifies alignment, and fastens the two tube sections together. The adjustment does not eliminate the need to verify dimensions from the truss drawings.
Is AHEP suitable for wood and cold-formed-steel trusses?
Yes. The detailed product announcement describes the AHEP for both wood and cold-formed-steel (CFS) step-down hip-truss applications. The truss material changes the fastening method and the connection details, so a wood-truss installation should not be copied directly onto a CFS assembly.
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- Wood trusses: the 2010 announcement refers to 10d nails for the wood-truss application. Confirm the required nail type, quantity, location, and current installation schedule in the applicable instructions.
- CFS trusses: the same announcement refers to #10 self-drilling screws for CFS applications. Screw selection, penetration, edge distances, and any CFS-specific limitations must follow the current details.
Mixed-material projects deserve particular care. If a roof uses CFS jacks with wood components, identify which member receives each fastener and have the designer resolve any transition connection. A fastener that is appropriate for a wood chord is not automatically appropriate for a thin-gauge steel chord.
What pitch range can the AHEP accommodate?
The available product announcement reports two different historical pitch ranges: 3/12 to 9/12 when used as a structural purlin and up to 12/12 when used as an installation spacer or lateral restraint. These figures come from a 2010 announcement, not a newly issued capacity table. They should therefore be treated as historical published guidance until confirmed in the current product instructions.
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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11Pitch alone is not enough to establish suitability. The designer or truss supplier also needs the step-down geometry, top-chord orientation, truss spacing, purlin location, overhang condition, roof sheathing system, and the loads that the purlin is expected to carry. A steep roof that falls within a historical pitch statement can still be unsuitable if the actual geometry or loading differs from the listed application.
How is the AHEP adjusted and fastened?
Use the following as a coordination sequence, not as a substitute for the current Simpson Strong-Tie installation sheet or the project’s sealed drawings. The manufacturer’s current documents govern the exact fastener schedule and placement.
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- Confirm the layout first. Obtain the truss placement plan, roof pitch, step-down dimensions, truss material, spacing, and the intended purlin line. Mark which AHEP locations are structural and which are being used only for erection restraint.
- Check the product and instructions. Identify the connector, review its current installation instructions, and verify that the intended pitch and geometry are within the current listed application. Do not rely on an old product announcement alone.
- Position the tubes. Place the inner and outer tubes where the purlin must run, then adjust their overlap so the connector lines up with the end-jack trusses and the flat top-chord section. Keep the member straight and avoid forcing a twist into the truss.
- Align before fixing. Sight along the purlin line from the eave toward the hip or peak. Check that the attachment surface is at the planned elevation and that it will not create a step in the sheathing plane.
- Secure the adjusted length. The 2010 announcement reports four #10 self-drilling tapping screws joining the adjusted inner and outer tubes. Because this is a historical figure, confirm the current screw requirement, pattern, and allowable adjustment before installing.
- Fasten to the trusses. Use the current wood- or CFS-specific schedule. The announcement refers to 10d nails for wood trusses and #10 self-drilling screws for CFS; current instructions may define the exact number, location, and edge distances.
- Provide erection bracing. The AHEP is not a complete truss-erection bracing plan. Install all temporary diagonal, longitudinal, and restraint bracing shown by the truss designer or erection plan, and keep workers off an unstable assembly.
- Inspect before sheathing. Verify that every connector is seated, fasteners are fully driven without damaging the member, the purlin line is continuous where required, and the sheathing bears as detailed. Photograph concealed connections if the project’s quality plan requires records.
What should the engineer or truss designer verify?
The AHEP’s two roles can create two separate design checks. As a structural purlin, it may receive sheathing reactions, construction loads, wind effects, or other forces assigned by the roof design. As an erection restraint, it helps control top-chord movement before the permanent diaphragm is complete. The temporary condition can govern even when the finished roof is adequately restrained.
- Load path: identify where purlin reactions enter the truss and how those forces travel through the connector and fasteners.
- Restraint stage: specify what is required before sheathing, during sheathing, and after the roof diaphragm is complete.
- Material compatibility: distinguish wood and CFS members, including the correct fastener system and any thin-gauge-steel limitations.
- Geometry: check the step-down spacing, purlin elevation, top-chord flat length, overhang, and hip-line alignment.
- Design loads: use the project’s wind, snow, dead, construction, and any concentrated loads rather than assuming a generic connector capacity.
- Inspection requirements: identify which connections require special inspection, photographs, or sign-off before they are covered.
Do not infer an allowable load from the connector’s appearance or from the fact that it is listed in a connector catalog. The reviewed sources do not establish a universal capacity, and capacity depends on the current design tables, member properties, fasteners, installation, and governing code.
Which documents should control a 2026 specification?
For a current project, start with Simpson Strong-Tie’s 2026–2027 Wood Construction Connectors catalog, identified by the manufacturer as the C-C-2026 edition that replaces C-C-2024. Its index lists AHEP on page 246 and directs users to product information, applicable specifications, and installation instructions.
The catalog is the appropriate starting point for the current product designation, while the project drawings and the product-specific installation sheet control the actual installation. The older announcement remains useful for understanding the original dual-purpose concept and the historical figures, but it should not override a newer detail, revised fastener schedule, or current limitation.
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When issuing a submittal, include the exact AHEP designation, the catalog or instruction revision used, the truss material, the intended pitch, and a marked detail showing the connector’s location. That documentation prevents a field crew from substituting a similar-looking purlin or using a wood schedule on a CFS truss.
What are the most common field mistakes?
Most AHEP problems come from treating an adjustable connector as a universal field fix. The following checks address the failure modes most likely to create rework or an unsafe erection condition.
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- Using a historical pitch limit as a blanket approval: the 3/12–9/12 structural-purlin and up-to-12/12 restraint figures are historical. Verify the current application before ordering or installing.
- Skipping the adjustment lock: an unfastened inner and outer tube can change length during handling. Install the specified joining screws before relying on the member.
- Misidentifying the role: a temporary spacer may not be detailed to carry the same permanent loads as a structural purlin. Mark the two conditions on the erection plan.
- Forcing alignment: if the AHEP does not line up naturally with the jack-truss ends, stop and recheck the truss layout rather than pulling the assembly sideways.
- Wrong fastener family: nails listed for wood do not establish a CFS connection, and a screw selected for CFS may not satisfy a wood connection. Follow the material-specific schedule.
- Ignoring the sheathing plane: a purlin that is too high, low, or twisted can telegraph into the roof deck. Check elevation and bearing before covering it.
- Assuming it replaces all bracing: the AHEP addresses a particular spacing or restraint function. It does not replace the full temporary bracing and safe-erection procedure.
- Covering unverified work: inspect the overlap, screw or nail installation, and truss alignment before roof sheathing hides the connection.
When is AHEP the right connector to specify?
AHEP is a logical candidate when a step-down hip-truss detail needs an adjustable purlin line and the same member can provide erection spacing or lateral restraint. It is especially relevant where the project uses the wood or CFS truss applications described by the manufacturer and where the current geometry and design documents support its use.
Choose a different detail, or obtain a project-specific engineering solution, when the roof falls outside the current listed pitch or geometry, when the purlin must carry loads not covered by the product literature, when the truss material or fastener condition is different, or when the erection sequence requires restraint beyond the AHEP’s stated role. The decision should be based on the current connector instructions and the truss designer’s drawings, not on a generic “adjustable” label.
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Before release, the responsible designer or contractor should be able to answer five questions:
- Is this a step-down hip-truss condition that matches the product’s current application?
- Will the AHEP be permanent structural framing, temporary restraint, or both?
- What are the current pitch, geometry, load, and fastener limits?
- Are the trusses wood, CFS, or a combination requiring separate details?
- What temporary bracing remains necessary before the roof diaphragm is complete?
What did the original product announcement claim?
The 2010 announcement presented the connector as a way to streamline step-down hip framing while adding structural integrity for lateral spacing restraints. It attributed the following statement to Stan Sias, then Simpson Strong-Tie national manager for the Plated Truss Industry: “Up until now, no single product on the market could streamline step-down hip framing and provide additional structural integrity for lateral spacing restraints.” That is a vendor representative’s statement in a product announcement, not an independent comparative test or a numerical performance result.
The announcement is useful historical context, but current project decisions should be based on the manufacturer’s latest catalog, product instructions, design tables, and the engineer’s requirements. No independently published adoption, savings, failure-rate, or performance statistic was identified in the reviewed material.
Frequently Asked Questions
Can an AHEP stay in the roof after temporary bracing is removed?
It can remain when the connector is detailed as part of the permanent structural purlin system. The truss designer must identify that permanent role and verify the loads, fasteners, and sheathing attachment; a member installed only for erection restraint should not be assumed to be permanent framing.
What information should I send with an AHEP submittal?
Include the truss placement plan, roof pitch, step-down dimensions, truss material, spacing, purlin locations, and the current Simpson Strong-Tie product instruction. A marked-up detail showing the intended overlap and fastener schedule gives the reviewer enough information to catch a geometry or material mismatch.
Does the AHEP eliminate the need for a truss-erection plan?
No. It addresses a specific purlin, spacer, or lateral-restraint function. The erection plan still needs the temporary longitudinal, diagonal, and other bracing required for safe stability before the roof sheathing diaphragm is complete.
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1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteWhere can I find the current AHEP requirements?
Use the current Simpson Strong-Tie Wood Construction Connectors catalog and the product-specific installation instructions rather than relying on the 2010 announcement. The manufacturer identifies the 2026–2027 catalog as the current edition and indexes AHEP on page 246.
