GC Is 15/16 Retarded!!!

hcecalaska

there are alot of arcticls around now about cost impacts casued by trade stacking and the decrease of labor production caused by increased crew size on construction projects. A GC and Sub trade need to be specific about project duration and schedule in the pre construction phase of a project, or it can cause financial impacts for all.

dirt diggler

i get what you're saying now ... god im slow


anyways - be careful what you ask for ...


cuz there IS someone who will make those cuts in 30 degree weather ... all while not letting the family dog out ... and they'll do it cheaper









one thing ...

if the family dog is there ... then the family is too

yet the house is still under construction....


im not a home builder nor sell homes

but i thought you had to get a cert. of occupancy before moving in ...

Casework King

Hey Dirt, This is a remodel and addition they can live in the rest of the house we have it totally taped off, Ive been there since the beginning right to the finish work. The GC's been trade stackin (thanks hcecalaska) through the whole job, sometimes it works, most of the time it slows production. heres some quotes.

Hide delays and then accelerate subcontractors
This practice is one of the most challenging problems for subcontractors. It leads to trade stacking and a serious loss of efficiency. Also, trade stacking often results in claims against the owner, even if the owner was only partially responsible. Better scheduling practices by project owners will reduce delays and help prevent the need for trade stacking.

http://www.claimsleader.com/pdf/Pinnell_PMI_Risk-CPM_Study_50524.pdf

Contractors’ Scheduling Procedures and Results Most contractors (75%) were satisfied with their scheduling procedures and results – including many of those with frequent and/or severe delays. Owners reported that only one-third of their contractors were good schedulers, one-third were fair, and one-third were poor.

Subcontractors also had a dim view of general contractors’ scheduling practices, which closely matched the owners' responses. Too few general contractors requested subcontractor input, prepared monthly updates, kept the subs informed, or prepared recovery schedules when delayed. Worst of all, most hid delays and caused trade stacking.

http://www.pinnellbusch.com/NL8.pdf

Loss of Productivity/Inefficiency/
Trade Stacking/Out-of-Sequence
Work. All of these terms relate to work
which arguably is not being performed
as efficiently as anticipated, resulting
in less work be completed in a given
unit of time and, therefore, at greater cost.
Loss of productivity may be the result
of acceleration, trade stacking, disruption
or standby time, among other potential
factors.
http://www.lanepowell.com/pdf/pubs/lmnf_2002_0004.pdf
This presentation also indicates that there are other factors that affect productivity and in general do not occur in isolation. They are as follows: overtime, changes, crowding, trade Stacking, weather and site access.
Work pace inertia, absenteeism, accidents, fatigue, morale and attitude, turnover, job shopping by workers, supervision problems, stacking of trades and pressure for more overtime.
http://www.awci.org/cd/archiveArticles.pl?id=544&acat=7
“ Except in the middle of a battlefield, nowhere must men coordinate the movement of other men and all materials in the midst of such chaos and with such limited certainty of present facts and future occurrences as in a huge construction project….”

• Start/Stop iteration
• Trade stacking
• Over-manning
• Environment/Weather

http://209.85.165.104/search?q=cache:8kGBn4ISfYAJ:www.mdcsystems.com/mdc/mdc.nsf/0/D2F5FF6C7B75DEE085256FCA006C7C6E/%24FILE/10-28-04%2BSchool%2BConstruction.ppt+%22trade+stacking%2 2&hl=en&ct=clnk&cd=64&gl=us

• Extra Work Scope
• Errors and Omissions
• Hidden Items
• Impossibility to Perform
• Compaction and Trade Stacking
• Active Interference
• Out of the consideration of the parties
• Unplanned working conditions
• And much more!

"CAUSES OF LOST PRODUCTIVITY
The following are a few of the more commonly reoccurring causes of poor productivity that are often within the control of the contractor:
1. Crews are too large, especially at the beginning and end of an activity,
2. Stockpile and storage areas are poorly organized or not adjacent to the work,
3. Materials are inadequately marked or not organized for efficient retrieval,
4. Housekeeping practices are poor,
5. The contractor is unable to maintain continuity or momentum because crews are reassigned to different work or locations,
6. Work of one crew interferes with that of another, (trade stacking),
7. Sequencing and control of the work are poor, and
9. Material deliveries are incorrect or untimely.
This list could easily be expanded, but the important point is that these causes exist to varying degrees on all construction projects. Many of them are subtle and appear gradually. Some exist, but are never noticed. Often, by the time a problem is noticed, the damage has already been done. In other cases, corrective action is perceived to cost more than it would save.
Other causes of productivity loss that manifest themselves on impacted jobs and lead to claims are often beyond the contractor's control such as:
1. Weather
2. Out-of-sequence work
3. Schedule Acceleration
4. Owner Changes
5. Extended Overtime
6. Defective contract documents
7. Trade stacking and congestion.
You see there are many variables that can slow a jobsite down some of the more pronounced are of the following:
Materials are inadequately marked or not organized for efficient retrieval,
Equipment not placed in ideal position for hightened production
Out of sequence work,
The stacking of trades.
These are some of the most common reoccurring problems and most easily avoidable causes of lost production.
Materials can easily be organized at the end of every day,
The equipment can be placed closer to work areas,
Make a feasible list of work to be finished at the end of each day to prevent out of sequence work,
Do not stack the trades this causes congestion and lowers motivation, this can be the downfall of any jobsite.

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