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Planning, layout & permissions
Can I install an aluminum fence directly on dirt?
Yes, with the correct in-ground foundation system. In the Alumission method shown here, a steel insert is set in a concrete footing and a compatible aluminum post sleeves over it. The aluminum slats form the fence above the ground. Simply pushing a standard post into soil is not the installation shown.
What should I confirm before digging?
Confirm the boundary, easements, required approvals, fence height, gate locations and underground services. Obtain the applicable utility-locate clearance and identify privately owned lines. Establish footing and post requirements before ordering or excavation.
Will 811 locate every buried pipe and cable?
Do not assume so. Follow your state’s 811 process and waiting period, and verify the required responses before starting. Irrigation, private electrical feeds, septic components and other owner-installed services may require a private locator. Utility markings also do not establish the property boundary.
How far apart should the fence posts be?
Use the layout for the exact Alumission system and configuration. Post-center spacing, clear opening and finished slat length are different measurements. Do not use a kit’s overall run length as a single panel span, or copy the old guide’s example spacing into a different installation.
Should I position gate posts first?
Plan gate locations and clear openings before the intermediate fence supports. Account for hinge and latch clearances, the swing path, grade and the gate’s own foundation requirements. Confirm the support design before fixing either gate post in concrete.
Is this a beginner DIY project?
It involves excavation, cutting aluminum and steel, mixing concrete, alignment and structural connections. An experienced DIY installer may handle a straightforward approved layout. Difficult ground, large gates, unusual wind exposure or uncertain footing requirements are reasons to use an experienced installer.
How long does installation take?
Allow time for layout and approvals, excavation, concrete placement, the specified curing period, and final assembly. Access, soil, number of sections, gates and cutting all affect the schedule. The short demonstration video is not a promise of same-day installation.
Hole depth, soil & concrete foundations
How deep should the concrete footings be?
There is no single depth suitable for every fence. Use the project’s footing requirements based on soil, local frost conditions, height, span, privacy level, wind and post loads. The video’s example depth is a demonstration, not a nationwide foundation design. Confirm depth before cutting the steel inserts.
How wide should each footing be?
Diameter depends on the ground conditions and loads as well as the post arrangement. A common rule of thumb from a concrete bag is not a substitute for the fence’s required foundation. Obtain both depth and diameter for the actual project; increasing one does not automatically compensate for reducing the other.
Do I need to go below the frost line?
Where frost affects foundations, obtain the applicable local frost-depth requirement and the correct footing detail for your fence. A shallow example from a warmer location may not work in your climate. Confirm this with the local authority or project designer before excavation.
What if the ground is clay, sand or loose fill?
These conditions can affect excavation stability, drainage and resistance to fence loads. Avoid pouring into an unstable or collapsing hole. A different foundation size, forming method or design may be needed. Have questionable ground assessed rather than compensating with extra water or loose backfill.
Should I add gravel under the concrete?
Use a compacted gravel layer only where specified by the foundation detail and concrete installation method. It takes up depth and must not reduce the required concrete embedment. Gravel alone does not solve drainage in every soil, particularly where the surrounding ground holds water.
What if water collects in the hole?
Find the source and assess whether the sides and base remain sound. Do not dilute the concrete in standing water or place an ordinary bagged mix underwater. Dewatering, forming or a revised method may be necessary; follow the mix manufacturer and project requirements.
Do fence footings need rebar?
Some foundation designs require reinforcement and others do not. Use the specified reinforcement, cover and placement if required. The internal steel post insert is not automatically a substitute for a designed reinforcing cage.
Can I use a base plate instead of digging a footing?
A base plate needs a suitable structural concrete or other approved support with correctly designed anchors. Soil, paving stones, thin patio slabs and loose blocks do not automatically provide that support. Choose the mounting method before selecting the post components.
Can I reuse old concrete footings?
Only after confirming their location, dimensions, condition and suitability for the new fence loads and connections. Hidden cracks, inadequate depth or unknown reinforcement can make reuse unsuitable. Do not assume an old wood-fence footing will support a new privacy fence.
Can I install posts where I hit rock or large roots?
Stop and assess the obstruction. Moving the support changes panel geometry, while shortening the hole changes the foundation. Rock anchoring and work near significant roots need an appropriate revised detail; do not improvise a shallow footing to avoid the obstruction.
Concrete mixing, quantity & curing
What concrete should I use for fence posts?
Choose a concrete product suitable for the specified footing and exposure. Fast-setting post mixes can be useful when their properties and working time suit the job. Cement alone and mortar are not interchangeable with concrete. Follow the exact product instructions rather than combining methods from different bags.
Can I pour dry concrete into the hole and add water?
Only when the particular concrete product explicitly permits that post-setting method. Some products require premixing, while approved no-mix products specify their own water and placement sequence. Do not rely on rain or soil moisture to hydrate a dry bag.
How much water should I add?
Use the amount and method stated on the selected bag or technical sheet. Measure the water rather than guessing. Extra water to make placement easier can change the mix’s performance, and one brand’s ratio should not be transferred to another product.
How many bags of concrete do I need?
First establish the required footing dimensions. Calculate the total concrete volume and divide by the actual yield printed on the bag, rounding up and allowing for the real excavation. Bag weight alone does not give the yield. The estimating worksheet above explains the geometry without selecting a footing size.
When can I slide the aluminum posts on and install the slats?
Wait until the concrete is ready for those loads under the product instructions and project requirements. Initial set, readiness for loading and development of design strength are different milestones. Cold weather and field conditions can extend the wait; keep the inserts protected and braced as required.
Can I pour concrete in hot weather, rain or freezing conditions?
Check the product’s permitted air, ground and material temperatures and its protection requirements. Do not pour on frozen ground or let fresh concrete freeze. Protect against washout and rapid moisture loss. Reschedule when you cannot maintain the required conditions.
Should the concrete slope away from the post?
Where the footing top is exposed, detail it to shed water away from the support rather than form a pocket. Coordinate the concrete top, finished soil level and aluminum clearance with the approved foundation detail. Keep soil and mulch from accumulating against the aluminum.
Do I have to wait 28 days before assembling the fence?
Not necessarily. Full-strength test age is different from the permitted time for a specific installation load. Use the concrete manufacturer’s loading guidance and any project requirement. A firm surface alone does not establish that the footing is ready.
Steel inserts, aluminum posts & hardware
Is the aluminum post buried in concrete in this method?
The tutorial uses a steel tube in the concrete and an aluminum sleeve over the exposed tube after the concrete is ready. Follow that compatible system detail. Do not fill or embed an aluminum profile just because a different fence brand uses direct burial.
Which steel tube does Alumission currently list?
The current reinforcement product lists 1¼″ × 1¼″ galvanized square tubing with a ⅛″ wall, in 4′, 6′ and 8′ stock lengths. The older video description mentions 14 gauge. These are different specifications; use the current project-approved insert and confirm fit, length and loads.
How long should the steel insert be?
Its cut length must provide both the specified below-ground embedment and the required extension within the aluminum sleeve. Confirm both measurements before cutting. The older video’s half-height reference is not a complete structural design or a universal rule for gates and exposed privacy fences.
Should I paint galvanized steel before putting it in concrete?
Use the corrosion-protection system specified for the actual tube and environment. The old video shows painting steel; that does not identify a universal coating for today’s galvanized product. Protect cut edges and damaged galvanizing with a compatible repair treatment and observe its preparation and curing directions.
Which screws connect aluminum to the steel insert?
Alumission lists #12 × 1″ 410 stainless self-drilling screws for compatible sleeved-post connections and a 5/16″ hex driver. Confirm the connection pattern, required engagement and the screw’s drilling capacity for the combined material thickness. Do not substitute the smaller slat-bracket screws.
Do I need a bottom cap or stopper?
Use the bottom support/finishing detail for the exact post profile. Alumission’s flat cap with a center hole is specifically for the 3-channel post sliding over the square steel tube. It is not a universal part for every post, and a similarly named side-post stopper can serve a different purpose.
Can the same posts support my fence and a swing gate?
Do not assume so. A gate adds weight, hinge forces, movement and wind loads. The support and footing must suit the gate width, height and hardware. Wide or motorized gates can need a different post system; confirm the complete gate detail before concrete placement.
Can I fill the aluminum sleeve with concrete for strength?
Do not add concrete inside the sleeve unless the exact system detail specifically requires it. This guide uses a compatible steel core and mechanical fasteners. Unspecified filling can interfere with assembly, drainage and material compatibility.
Cutting, slats, slopes & finishing
Can I use one saw blade for both aluminum and steel?
Only if both the saw and blade manufacturers explicitly rate that combination for both materials. In practice, plan an aluminum-rated cutting setup for profiles and a steel-rated setup for inserts. Clamp the work, support long pieces and use the appropriate protection.
How do I calculate the slat cut length?
Measure the installed receiving channels and apply the required engagement and fitting allowance for that profile. Top and bottom readings should agree for a rectangular opening. Test-fit one slat before cutting the batch; do not subtract a generic allowance from every system.
How much gap should I leave between slats?
Use the chosen style’s slat and spacer schedule. A full-privacy pattern and a spaced pattern are not assembled identically. Keep spacers matched at both ends and check cumulative height so the top connection and cap still fit.
How much clearance should be left above the dirt?
Set clearance from the finished grade, allowing for drainage, ground variation and the purpose of the fence. Pool barriers and animal containment can impose specific limits. Do not choose a universal gap from this guide, and do not use the bottom slat as a soil-retaining board.
Can horizontal slat fencing follow a slope?
Plan a compatible stepped or other approved layout before cutting posts. Do not assume Alumission slats can rake like a preassembled ornamental picket panel. Consider top-line changes, low-side gaps, ground clearance and gate swing throughout the run.
What if the space between posts is different at the top and bottom?
Check plumb, post rotation and alignment before cutting. Correct the support problem using an appropriate method; do not force long slats into a tapered opening. If the concrete has set, obtain a repair detail rather than levering the insert loose.
How is the top slat held in place?
The original 3-channel/side-post method uses L-brackets and #8 screws at the top-slat ends. A profile with a separate screw channel can use a different connection and cover arrangement. Follow the detail for the actual profile rather than mixing the two methods.
What silicone should I use for the caps?
Use an exterior product compatible with the cap, aluminum finish and any adjacent materials, following Alumission’s detail and the sealant manufacturer’s preparation and cure instructions. Silicone secures a cap where specified; it does not replace structural screws.
Can this installation be used for a pool fence?
Only if the complete fence and gate assembly satisfies the requirements applicable to that pool and location. Height, openings, climbability, ground clearance and self-closing/self-latching gate provisions need specific checks. This general installation guide does not certify a pool barrier.
Troubleshooting, care & project cost
What if a post moves while the concrete is setting?
Recheck and correct it only within the concrete product’s permitted working stage. If the mix has begun to harden, stop rather than rocking the post and creating a loose pocket. Assess whether the footing must be replaced or repaired before assembly.
Why does my completed fence wobble?
Possible causes include loose sleeve-to-core fasteners, inadequate insert support, foundation movement or a connection problem. Identify which component moves first. Tightening slat brackets will not fix an unstable footing; obtain a suitable repair before adding gate loads or privacy infill.
What if the top slat or cover will not fit?
Check the slat count, spacer sizes, cumulative height, cut accuracy and correct profile parts. Remove burrs and clear debris. Do not force the cover or cut away a load-bearing connection to hide an assembly error.
What should I inspect after installation?
Check fasteners, caps, covers, post alignment, panel retention, footing movement and drainage. Remove trapped debris and keep soil away from the lower slats. Inspect gate alignment and hardware separately, and recheck after unusual wind or ground movement.
What affects the installation cost?
The fence style and height, number of supports, concrete volume, soil, access, disposal, slopes, gates and labor all matter. Include steel inserts, coatings, cutting equipment and delivery in the scope. Compare quotes using the same complete material list and foundation requirements.
What should I send Alumission for installation help?
Send the product or order details, total run and section dimensions, desired height, ZIP code, ground conditions, gate openings and clear photos of the site or connection. State whether you need help choosing parts, interpreting the assembly detail or finding an installation solution.