80x120 Steel Building

Carried without compromise on eighty by one hundred twenty feet: vehicle and equipment storage and agricultural and implement storage and light commercial and service and racked warehousing and distribution. A footprint never settles a building type by itself — what it settles is which of the eighty-foot span, the one hundred twenty-foot run or the twenty-two-foot eave has to move when the use changes. Here that is decided by the fact that the width tolerates racking changes, because the lane can be re-struck without moving structure, while support space is placed to serve one segment, and remote segments need their own access. 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? Where a decision can be deferred cheaply, defer it; where deferring means cutting into finished steel or concrete later, settle it before the order.

• Barndominium at 80x120
• Metal Garage at 80x120
• Agricultural Building at 80x120
• Workshop at 80x120
• Commercial Building at 80x120
• Storage Building at 80x120

No price appears on this page. What the stored record supports is which quantities an estimate scales with at eighty by one hundred twenty feet: 9,600 sq ft of slab, 177.8 cu yd of nominal concrete, 8,800 sq ft of wall surface, 10,119 sq ft of roof surface and 400 ft of perimeter. At 1.97 sq ft of skin per sq ft of floor this footprint is skin-heavy, so cladding, insulation and trim decisions outweigh floor decisions. Raising the twenty-two-foot eave moves wall area alone; adding a bay of roughly 24 ft to the run moves wall, roof and slab together, which is why a long repeating bay sequence, so segment boundaries are set by bay lines rather than by walls is a budget statement as well as a layout one — and why the width tolerates racking changes, because the lane can be re-struck without moving structure belongs in the same conversation as the quantities. The threshold is where most avoidable problems start, because water, level and approach all meet there and none of them is negotiable afterwards.

A 80x120 metal building encloses 9,600 sq ft on a clear span of eighty feet running one hundred twenty feet deep — a moderately rectangular footprint, the most forgiving of the common proportions this platform records in the industrial class. Read as two separate purchases, that is double-sided hall width across and corridor depth down the run: eighty feet of span buys racking or work zones on both sides with a full vehicle lane down the middle, and one hundred twenty feet of depth means a long repeating bay sequence, so segment boundaries are set by bay lines rather than by walls. Neither statement follows from the 9,600 sq ft total, In exact terms, dividing eighty feet of span by a nominal twelve-foot vehicle lane leaves six lanes and eight feet over, enough for a bench run with clearance behind it, which is where much of the practical value of this span sits, and one hundred twenty feet of run divides into five nominal bays at about 24 ft, which is a tighter division than the twenty-five-foot module, so each bay carries slightly less depth than the count suggests. That is why area alone is a poor way to choose between footprints. Usable floor is always less than enclosed floor once doors swing, racking sits off the wall and a route is kept clear from the entrance to the far end.

Span buys cross-section. At eighty feet that means racking or work zones on both sides with a full vehicle lane down the middle, so two working sides plus a movement lane, which is the arrangement wide spans are bought for, and movement is planned as a lane with turning space at each end, not as leftover floor. Precisely, dividing eighty feet of span by a nominal twelve-foot vehicle lane leaves six lanes and eight feet over, enough for a bench run with clearance behind it, which is where much of the practical value of this span sits. The consequence for the one hundred twenty-foot direction is immediate: because the width tolerates racking changes, because the lane can be re-struck without moving structure, later change has to happen along the length, where a long repeating bay sequence, so segment boundaries are set by bay lines rather than by walls and distant segments are only practical for material that moves in and out rarely. A eighty-foot span therefore sets the ceiling on how far 9,600 sq ft can be re-thought after the frame is ordered. Interior work is usually the larger half of the budget on a small footprint and the smaller half on a large one, which is why area is a poor guide to cost.

Large footprints are where the ratio of enclosing surface to enclosed floor becomes the dominant number. A compact plan encloses the same floor with less skin than a long thin one, which changes cladding scope, insulation scope and the amount of perimeter to detail and drain — before anything is done to the inside.

• Compare candidate footprints on skin area per square foot of floor, not on area alone
• Count perimeter separately, because grade detailing and drainage follow it
• Decide whether flow or envelope efficiency governs, and record the reason
• Re-check openings against the chosen proportion, since wall length changes with it

Four arrangements survive a span of eighty feet at one hundred twenty feet of depth: light commercial unit, agricultural equipment storage, shop plus office, shop plus storage. The others are ruled out by geometry rather than by taste, because a 1.5:1 plan offering racking or work zones on both sides with a full vehicle lane down the middle while distant segments are only practical for material that moves in and out rarely cannot host every programme. Each allocation below divides the stored one hundred twenty-foot length only; the eighty-foot direction is fixed and carries openings are placed to suit the movement lane rather than the walls, so the lane sets the door line. Any figure taken from a planning page is an orientation value; the ones that govern the build come from the approval drawings for the specific building ordered.

Two working sides plus a movement lane, which is the arrangement wide spans are bought for, while along the length a long repeating bay sequence, so segment boundaries are set by bay lines rather than by walls, and in exact terms one hundred twenty feet of run divides into five nominal bays at about 24 ft, which is a tighter division than the twenty-five-foot module, so each bay carries slightly less depth than the count suggests. Anything permanent — a partition, a rack run, a mezzanine edge, a floor joint, a secondary door — is cheapest on one of those lines. Which line gets it follows from the cross-section as much as the run: distant segments are only practical for material that moves in and out rarely, while across the span two working sides plus a movement lane, which is the arrangement wide spans are bought for. Deciding what will never happen in the building is as useful as deciding what will, because it releases area and simplifies the openings.

• Gable-end access on the eighty-foot wall — leaves the one hundred twenty-foot run uninterrupted and suits racking or work zones on both sides with a full vehicle lane down the middle
• Sidewall access on the one hundred twenty-foot wall — struck on one of five bay lines at roughly 24 ft, where distant segments are only practical for material that moves in and out rarely
• Aligned openings at both gable ends — a straight through route is the plan; anything that forces a turn inside costs real time
• A walk door independent of the main opening, so daily access does not depend on operating a large door

Stepping down from 80x120 lands on 60x150 at 9,000 sq ft. The reduction costs 20 ft of span, which is where the lane arrangement lives, so the five-bay rhythm this footprint is planned around does not survive the change intact, and two working sides plus a movement lane, which is the arrangement wide spans are bought for would have to be re-tested against the smaller shell. It is worth writing the intended arrangement down before quoting, because two suppliers can price the same footprint against very different assumptions about openings and interior work.

Over 9,600 sq ft the nominal slab volume computes to 177.8 cu yd at 6 in, before thickened edges, piers or haunches. The figure to hand over with it is 0.042 ft of perimeter per sq ft of floor, because on eighty by one hundred twenty feet the edge forming and anchor setting follow the 400 ft perimeter rather than the area — low enough here that placement, jointing and finishing of the interior floor dominate the scope. Given that one hundred twenty feet of run divides into five nominal bays at about 24 ft, which is a tighter division than the twenty-five-foot module, so each bay carries slightly less depth than the count suggests, joints are worth striking on those bay lines so the floor shares the frame's grain, particularly where distant segments are only practical for material that moves in and out rarely and movement is planned as a lane with turning space at each end, not as leftover floor. Any figure taken from a planning page is an orientation value; the ones that govern the build come from the approval drawings for the specific building ordered.

A twenty-two-foot eave under a 4:12 roof computes to 35.3 ft at the ridge, so height across eighty feet of span is a profile rather than a single figure. The extra 13.3 ft sits over the centreline, exactly where movement is planned as a lane with turning space at each end, not as leftover floor — usable volume, rarely usable working height. The open question at this footprint is whether the programme genuinely uses that eave, since it is paid for across 8,800 sq ft of wall, and it is settled together with the run, where long enough that the interior is planned in segments with their own access. Interior work is usually the larger half of the budget on a small footprint and the smaller half on a large one, which is why area is a poor guide to cost.