Start page Calculation wage entry
Before you begin, it is necessary to enter calculation wage per man-hour. The calculation wage is the contract wage without surcharges.
With a click of the blue button “+ surcharges click here”, you come to step 1, entering your surcharge rates.
Step 1 Surcharges rates
How high is the construction site overheads surcharge, surcharges for general business costs, business risk and profit, cash discounts and other discounts for the contract? It shows you the conversion with surcharges to individual costs of partial performances.
Step 1 in formwork calculation: amountsthe BOQ
Which items do you plan your formwork system for? In this example, it is the BOQ items 3.1.9 + 6.1.4 + 7.1.8 with an amount of 1,000 m²
Step 2 in formwork calculation: costs and time
In this example, we have a formwork system from PERI: Skydeck, but other systems, e.g. Doka, can be calculated.
Skydeck formwork has a special advantage: the formwork can be taken away and be applied at another place. Supports and dropheads stay and are removed after sufficient setting time.
Pay attention to how your supplier calculates their rental times, with 4 weeks per month or 4,3333 weeks (= 52 weeks / 12 months). You can select this value with the round checkboxes.
Our plans here allow for a hold-back time of 8 weeks, 250 m² of formwork and the doubled amount of bracing and dropheads to be available. Formwork is to be carried out on one level with an average of 4 applications of the 250 m².
The ordering costs for rent is to be entered for 1 month per m² and the remaining provision (here: 8 weeks – 4 weeks = 4 weeks) as normal monthly rent per m²; this app automatically takes the remaining rental time into account. Each for the individual component. Should you not have supports and dropheads separate, then the average value for framework facing is to be entered. However, a differentiation makes it easier to provide evidence of costs, for example, during construction stoppages or delays.
Complete delivery of all components.
Assembly, for example, with 0.5 hours per m² of formwork facing of 250 m², with 4 applications (Applications are automatically determined with a total area based on the formwork facing amount).
Should you, for example, not use formwork over a single level and have to store the formwork until the next level, then the labour costs for all storages, per m² based on the formwork facing area, can be entered here.
Loading labour costs per m² based on formwork facing area in order to be able to remove components from the construction site.
Complete removal all components from the construction site back to suppliers.
Remaining materials, for example sealant per m² formwork facing here for 1,000 m².
Stripping here after 3 days (for hold-back time)
Removing bracing here after 4 days (for hold-back time)
Costs for assembly planning if necessary per m² formwork facing here for 1,000 m².
Costs for final cleaning and small repairs for 1.) formwork facing 2.) bracing and 3.) dropheads per m² of each assembly group.
Required time: This query assists estimation of your hold-back time.
This app is pre-set for a formwork crew with one worker and 8 hours per day. In this example, the crew consists of 6 workers per 8 hours a day.
Concrete work allows for an average value suitable for the amount of formwork facing, here pre-set for 1 day.
This results in 23.2 processing days including concrete work and 13 days for setting (3 x 3 days + 1 x 4 days, the app determines the setting time from your data automatically.)
For a 5-day week, as pre-set, results in 7.2 weeks hold-back time; this is smaller than the calculated value. A tick is shown for a sufficient amount of time. Watch out, no working time is allowed for installing reinforcement, hold-back time for interim storage, e.g. until you have finished the first level for the next application, and also no small applications, e.g. instead of 4 x 250 m² = 1,000 m² 150 + 150 + 200 + 150 + 150 + 200= 1.000 m² here the setting time 5 x 3 + 1 x 4 = 19 instead 13 days. This needs to be allowed for when entering the calculated hold-back time.
You are now shown the costs and hours per unit including surcharges (breakdown of unit prices) and the total hours here for 1,000 m² 921.9 hours. It is necessary to enter here the equipment costs including surcharges, e.g. truck crane. The equipment costs (provision), e.g. for a tower crane, should either be carried out in an appropriate item in the bill of quantities or through a construction site overheads surcharge. Then crane operations would be allowed for in the formwork item set-up, interim storage, removal and loading. How you allow for this rests on you or on your bill of quantities.
As a final result, the (nett) unit price is shown. Differences in labour costs in the bill of quantities can be taken into account, e.g. with surcharges and deductions (factors), in the single positions.
Please keep your documentation as screenshots (press home button + on/off switch at the same time) of individual steps and insert these in your original calculations. This makes it easier for you and your client to reach an agreement in the case of changed and additional work and construction delays
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