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Question DetailsAsked on 9/26/2017

How much it cost to raise flat roof of commercial building?

Raise roof 5 ft, 58 ft long by 44 ft wide building.. One main metal beam across 58 ft, rests are woods.

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Depends on the type of building construction and whether the walls and longitudinal support beam can just be raised, or if some reconstruction or additional supporting columns are needed on the walls, but for just a simple roof raising (assuming these are standard 2x8 or 2x10 joists spanning from walls to center beam) typically something on the order of $10-20/SF for a "simple" raising job - more complex jobs which require reconstruction of the roof (teardown to no roof and rebuild, reusing framing as possible) can more commonly get into the $20-30/SF range for your roof type - which is in the range for a total new roof from scratch in many cases because it is commonly cheaper to demolish and build from scratch with new materials than to expend extra labor in disassembling and reusing materials. For the framing type you are talking about and that roof size, I would hazard that lifting the entire roof in one peice to raise it is unlikely to be the selected option - more likely a tear-out and rebuild job (with existing materials if suitable for reuse).

You are going to need a design from a Structural Engineer - and if this is not the only work being done you will probably have an Architect doing plans and specs for the remodel (he/she will have a structural do the structural design part). So that is your starting point.

Answered 2 years ago by LCD

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