100x100 Steel Church Building

This page is ordered around height and clearance, because at 100x100 the 22-foot eave limits a steel church building sooner than the plan does.

The footprint holds 6 activity zones — 3 across by 2 deep — and leaves 26 feet of depth for a chair-and-table store deep enough to take loaded carts, opening straight onto the floor rather than onto a corridor.

Commitment first: 47% of the 10,000 square feet goes to activity zones at 780 square feet each, and 4,800 square feet survives as edge strip. A footprint is worth its own decision when that split lands where the work does. Depth is bought cheaply and width expensively, which is why this proportion tends to be argued about before anything else.

A 100 by 100 footprint is a near-square plan: 10,000 sq ft enclosed by 400 ft of wall, at a 1:1 length-to-width proportion. Along its 100 ft dimension it takes 3 runs of activity zones at 30 ft, leaving 10 ft over — the 10 ft is where the argument about this size actually happens. A multipurpose floor is judged on turnaround. The same area serves seated gatherings, meals, recreation and community lettings, and the constraint is not area but how long it takes two people to convert it — which is a storage and door problem far more than a floor problem. Accessibility routes run from the parking space to every part of the building, and they are set by requirements determined for the specific site.

This footprint is planned as a multipurpose assembly floor with a set-up and strike cycle. The longest internal travel on a 100 by 100 plan is about 141 ft corner to corner, and the shortest useful one is the 100 ft cross-run. For a a multipurpose assembly floor with a set-up and strike cycle that matters where multipurpose floor planning sits, because shortening the 100 ft run to serve it lengthens every trip along the 100 ft dimension. Heating and cooling a room used intensively for a few hours is a different problem from conditioning one occupied all day.

Span drives headroom at 100x100: 100 feet of width on a 4:12 pitch puts 38.7 feet over the middle and 22 feet at the walls, so where a tall item stands matters as much as how tall it is. Cleaning, maintenance and inspection all need reach, and reach is planned in the gaps rather than in the modules.

Recreational use is what sets height in this mode, and it is the one requirement that cannot be met after the fact. If the floor is ever to be used for indoor activity, the clear height under structure — not the eave — is the figure to confirm with the manufacturer early.

Ventilation across 10,000 square feet at this height: a room that fills and empties fast needs air handling matched to that pattern rather than to its floor area.

The secondary demand this footprint has to absorb is a gathering room paired with a fellowship floor: the leftover cannot hold a servery, so tables and carts are stored against a wall in whichever room is emptier. Almost all of the floor stays undivided; the planning happens at its edges. Furniture storage, a serving point and a control position take a band along one side, and the quality of that band decides whether the open floor is genuinely open.

The 26-foot leftover depth is 2,600 square feet across the full width — deep enough to plan deliberately, and at this footprint it goes to a chair-and-table store deep enough to take loaded carts, opening straight onto the floor rather than onto a corridor. Height is the dimension people regret; it cannot be added later without rebuilding the frame line.

The 22 feet of spare width runs the whole 100-foot length — 2,200 square feet of wall strip. It earns its keep as shelving, staging or a walking route, not as another activity zone. A wider bay is a structural decision and a longer bay is a layout decision; the two are often confused.

The longest internal travel on a 100 by 100 plan is about 141 ft corner to corner, and the shortest useful one is the 100 ft cross-run. For a a multipurpose assembly floor with a set-up and strike cycle that matters where multipurpose floor planning sits, because shortening the 100 ft run to serve it lengthens every trip along the 100 ft dimension. Heating and cooling a room used intensively for a few hours is a different problem from conditioning one occupied all day. That movement pattern, not the 10,000-square-foot total, is what decides whether the leftover 26 feet is useful here.

One opening per position works on this gable: 3 across 100 feet, with 22 feet of wall to distribute as piers. Splitting that margin evenly is what keeps the elevation buildable. A building that cannot be reversed out of is a building that gets used in one direction only.

Doors here are sized for furniture on wheels, not for people. A pair of leaves or a wide opening between the floor and its store is worth more than an extra exterior door.

Nominal bay division computes to 4 bays at about 25 feet, narrower than the 26-foot module — so frame lines land inside positions and the interior has to be set out from the columns. Service routes are cheap to plan now and expensive to retrofit through a finished shell.

Depth here creates a hierarchy: 2 rows means front positions get used and rear positions get filled. Deciding which is which up front is what keeps 100x100 workable. Every foot of width added multiplies through the roof and the frame; every foot of length mostly adds skin.

Extension is cheapest along the 100 ft dimension, where each added bay repeats work already framed; widening past 100 ft is a different frame rather than a longer one. Growing to 100 by 130 adds a 4th run of activity zones — useful if the constraint is activity zones rather than the 10 ft already spare at the far end.

Configured as a multipurpose assembly floor with a set-up and strike cycle, 100x100 is judged on whether the 6 activity zones it holds match the operation, and on whether the 22 feet of spare width leaves the route this mode depends on.

• Does the work need an interior street with independent zones on both sides and turning room at each end, or does it need a second lane that this 100-foot span cannot give?
• Is the 100-foot length being bought for depth, or for the repeated bays — eight to ten repeated bays, which makes the layout a scheduling problem as much as a spatial one?
• What span does the assembly room need for the seating layout you intend?
• Is the support wing on the side or the end, and how does the lobby connect them?

• 50x80 moves the count from 6 to 4 activity zones (2 across by 2 deep), which is the reason to choose between them.
• 40x100 holds the same 6 activity zones but changes the leftover depth by -10 feet, which is where the difference is actually felt.
• 60x80 moves the count from 6 to 4 activity zones (2 across by 2 deep), which is the reason to choose between them.

Because this footprint is planned as a multipurpose assembly floor with a set-up and strike cycle, the useful next reads are different from the ones a differently shaped steel church building suggests: multipurpose floor planning, furniture storage planning, flexible assembly layout.

No price appears on this page. The quantities that scale an estimate at 100x100 are 10,000 square feet of slab, 185.2 cubic yards of nominal concrete, 8,800 square feet of wall cladding and 10,541 square feet of roof cladding. Noise from this floor reaches the office, the neighbours and the yard, and separation is a plan decision.

Proportion drives cost here as much as size does: 400 ft of wall around 10,000 sq ft is 0.04 ft of wall per enclosed square foot, and a squarer plan of the same area would carry less. What moves the figure further on a a multipurpose assembly floor with a set-up and strike cycle is the fit-out multipurpose floor planning implies, along with framed openings and the height chosen for the 100 ft span.

• the clear span across the assembly room
• the support wing and its internal partitions
• acoustic and interior finish work
• egress doors distributed around the assembly volume