100x120 Steel Church Building

No price appears on this page. The quantities that scale an estimate at 100x120 are 12,000 square feet of slab, 148.1 cubic yards of nominal concrete, 6,160 square feet of wall cladding and 12,369 square feet of roof cladding. Ground conditions and drainage decide the floor before the frame does.

Floor finish and its maintenance regime carry more weight here than in any other assembly mode, because the same surface takes chairs, tables, food service and footwear all week.

• 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

This page is ordered around access, because on a 100-foot endwall the opening arrangement settles how a steel church building at 100x120 is actually used.

The footprint holds 9 activity zones — 3 across by 3 deep — and leaves 16 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.

What distinguishes 100x120 is depth behaviour: 3 rows along 120 feet after 14 feet of circulation, with 16 feet unaccounted for at the end of the run. Security and after-hours access are easier to design in the door layout than to bolt on later.

A 100 by 120 footprint is a mildly directional plan: 12,000 sq ft enclosed by 440 ft of wall, at a 1.2:1 length-to-width proportion. Along its 120 ft dimension it takes 4 runs of activity zones at 30 ft, leaving 0 ft over — the 0 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. Arrival and departure are the two minutes that shape the plan; the hour in between is comparatively undemanding.

At 100x120 the operating question is a specific one: can one floor be reset between uses quickly enough that nobody plans around the reset? That is a different question from the one a steel church building of another shape has to answer, and it is why this footprint is planned as a multipurpose assembly floor with a set-up and strike cycle rather than as generic covered area.

The 100-foot gable can carry 3 openings, one per activity zone, with 22 feet of wall left for piers between and beside them — the arrangement that keeps each position independently reachable. An empty building looks generous and a working one rarely does; plan against the working state.

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.

The columns win at this footprint: 24-foot nominal bays against a 26-foot module means every layout decision starts from where the frames fall. The building is fixed for decades while the operation inside it changes every few years, and the plan has to survive that.

Depth here creates a hierarchy: 3 rows means front positions get used and rear positions get filled. Deciding which is which up front is what keeps 100x120 workable. The floor treatment is a use decision that outlasts most of the equipment standing on it.

Extension is cheapest along the 120 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 150 adds a 5th run of activity zones — useful if the constraint is activity zones rather than the 0 ft already spare at the far end.

Configured as a multipurpose assembly floor with a set-up and strike cycle, 100x120 is judged on whether the 9 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 120-foot length being bought for depth, or for the repeated bays — a long repeating bay sequence, so segment boundaries are set by bay lines rather than by walls?
• 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?

The secondary demand this footprint has to absorb is a chapel-scale gathering room with essential support rooms: there is no vestibule depth, so arrival and departure happen inside the room itself and the back rows absorb it. Dividing the 12,000 sq ft by the 26 by 30 ft activity zone gives roughly 12 positions before circulation is deducted a second time for cross movement. Whether the plan keeps 12 or drops to 8 comes back to the question this footprint is really answering: can one floor be reset between uses quickly enough that nobody plans around the reset?

Because 16 feet clears the 14 feet this platform treats as usable, the end of the run is a room rather than a gap: 1,600 square feet for a chair-and-table store deep enough to take loaded carts, opening straight onto the floor rather than onto a corridor. The span is the commitment; everything inside it is rearrangeable later, and the 100-foot dimension is not.

The 22 feet of spare width runs the whole 120-foot length — 2,640 square feet of wall strip. It earns its keep as shelving, staging or a walking route, not as another activity zone. Doors and their approaches decide more about daily use here than the enclosed area does.

The cycle is set up, use, strike, and it repeats several times a week. Storage that requires a corner to be turned, or a threshold to be crossed, adds time to every one of those cycles. The kitchen or servery is the space most often added after occupancy and the hardest one to add well. That movement pattern, not the 12,000-square-foot total, is what decides whether the leftover 16 feet is useful here.

The stored configuration carries a 14-foot eave and computes to 26.5 feet at the ridge on a 3:12 pitch — a 12.5-foot rise across 100 feet. Height is therefore not uniform, and the sidewall is the constraint. Two operations of the same size can want opposite plans, so the arithmetic below is a starting point rather than a recommendation.

Height on a 100 ft span is a separate decision from the 120 ft length, and it is the span that sets the frame's behavior. Raising the eave over 12,000 sq ft affects every bay along the 120 ft dimension, so the test is whether multipurpose floor planning genuinely needs the extra clear height or only the floor area.

Ventilation across 12,000 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.

• 60x80 moves the count from 9 to 4 activity zones (2 across by 2 deep), which is the reason to choose between them.
• 40x120 moves the count from 9 to 8 activity zones (2 across by 4 deep), which is the reason to choose between them.
• 50x100 moves the count from 9 to 6 activity zones (2 across by 3 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.