Asbestos Enclosure Negative-Pressure Airflow Calculator
Estimate the negative-air machine airflow (CFM) needed to achieve a target air-changes-per-hour rate inside an asbestos abatement containment enclosure.
Materials & Quantities
What comes off the job, and the temporary works that exist only while it runs.

Debris volume, weight and swell; dumpster and skip sizing with tipping fees; land clearing arisings; debris chutes and their impact energy; hoarding, temporary fencing and wind ballast; needle props and underpinning support; site accommodation loads; and the storage and staging that has to fit around all of it.
Whether the constraint is volume or weight. A skip fills by volume and a truck is limited by weight, and demolition arisings swell — the same wall is one volume standing, another in the grab and a third in the container. The calculator that matters is the one for the constraint you will actually hit first.
Formwork and falsework carrying a pour, which are with concrete, and the excavation support holding ground open.
15 calculators
Estimate the negative-air machine airflow (CFM) needed to achieve a target air-changes-per-hour rate inside an asbestos abatement containment enclosure.
Calculate the amount of solidifying agent needed to treat a concrete washout basin's liquid waste, based on the product's manufacturer-labeled dosage rate.
How much of a skip or roll-off's rated cube a lumpy demolition stream will really occupy, and whether cube or payload runs out first.
Calculate the number of support brackets needed to secure a debris chute run at the manufacturer's specified maximum spacing.
Estimate the free-fall impact energy and average impact force of debris dropped through a gravity chute, as a conservative screening estimate.
Calculate the total footprint needed for a debris staging or laydown pile, including a required setback clearance on all sides.
Convert a demolition debris volume into an estimated weight in tons or tonnes, using a density for the material, for loads reported by weight.
Estimate the bulked (swelled) volume of demolished masonry or concrete debris for hauling, using typical material swell factors.
Calculate the total cost of a dumpster or roll-off container rental, based on the hauler's daily rate and haul/delivery fee.
Determine the smallest standard dumpster/skip size that fits your estimated debris volume, accounting for irregular packing.
Calculate the total water volume and number of water truck loads needed to apply dust suppression across a jobsite area.
Estimate the volume of brush, vegetation, and grubbing debris generated from clearing a site area.
Calculate the total disposal cost for a load of debris based on its weight and the landfill or transfer station's tipping fee rate.
Calculate how many stacked pallets fit within a storage area's footprint and height limit.
Calculate the estimated payout for a load of scrap metal, based on its weight and the current market price per unit weight.