Case Study Q&A Flashcards
How did you calculate the £8000 contingency sum for the patch repairs?
I worked with the design team to understand the full scope of works that might be required and build up a cost for the areas including the removal of the top layer, drying out, and the reinstatement of the vapour control layer and the roof tiles including making good to the flashings because the areas were at the corner of the flat roof.
Risk allowances and contingency are often used interchangeably but please can you tell me the difference between the two?
Contingency typically for unknown risks, risk allowance typically comes from a risk register of known risks.
You had a budget of £8000 to deal with the leakage but the contractor’s cost came to £400k for all the repairs. How did you communicate this to the client?
- I advised the client that the £8k was for patch repairs only and the works would definitely cost more, although at the time I was unsure of the full extent of the scope of works
- Because of the timescales I spoke to the client about the budget we had received as part of the options. Advising them that I do not believe it was a true representation of the costs that would be required.
What are the different types of waterproofing?
- Structural / Integrated wtaerproofing
- Barriers, which is what we used on Silbury House
- Cavity drain systems
What is a typical build up of a flat roof?
On Silbury House it was:
- Metal roof deck £120 m2
- Vapour control layer
- Insulation
- Waterproofing
You mentioned there were 38 EAIs. Can you talk me through why there were so many and the change control process on the project?
At what RIBA design stage was the design responsibility shifted to the Contractor?
Any allowance for design development risk that would have protected the client from additional costs
How did you arrive at the contingency sum of £8000. Did the contractor’s price include for fixing the leak?
What was the contractor’s proposal for fixing the leak identified after the first survey.
By consulting a specialist roofing consultant, are you acting ethically?
What was the scope of works covered under the enabling works? – Why separate?
Does the project value reflect the initial works, or the enhanced requirements? How did they differ cost wise?
How did you get to your number of £8k for the patch repairs?
Do you know why the survey did not pick up the other areas of defects?
Was there an option to act on any existing warranties? Late
How did the 400k differ from the £180k you advised?
Was the 400k a budget or a fixed cost proposals?
Was there any differences in the revised value for £60k
Was the roofing advisor party to the contract? What would happen if their advise was wrong?
How important was cost to the client, given you were paying for all these enhancements to the scope? Were these included within your contingency
Did the contractor know about the surveys before they started?
In the contract, is there a timeframe for which they have to provide the cost for rectifying the leaks?
Is 2 weeks to issue an EAI a reasonable timeframe?
Did you include a provisional sum in the contract for roof repairs?
Did you provide a budget cost before the contractor issued their cost?
Why did you choose a D&B contract for this project?
Next time, how could you pass this risk onto the contractor?
- prov sum
- competitive price incl. risk.
If you passed on the risk through a D&B contract, why were the roof leaks the client’s risk? I think you have to say you would have allowed for a prov sum for unknowns.
In general, very good. I’d say you’re well prepared for the final assessment.
Why single stage and not two-stage on this project?
Single stage,
- clear scope of works
- enabling works had already been undertaken so contractors could review the stripped out building
Two stage,
- could have been useful because contractor could have undertaken surveys etc.
Why JCT?
- Standard contract both parties are familiar with
- Risk is shared fairly
- Comprehensive and covers most potential issue including dispute resolution
What was the intent with a light touch refurb?
How was the testing done with the rental market?
Agent led
Was the roof leak not a contractor D&B risk item and transferred? How was it set out in contract?
Building survey and agreement
Building this age not appropriate to assume a new roof needed?
How could you mitigate the delay in the contractor issuing cost
- Robust change control (there was one but no penalties for not complying)
- EAI
How did you get to a cost of £180k vs their £400k – what was main differences?
Building fabric not in scope? Why not?
There is a heavy focus on the project been sustainable. What practices/schemes are in place to make this project sustainable?
BREEAM
RESET
FITWELL
WELL
NABERS
Why was there such a big difference between your initial costs (£8,000) and the contractors costs(£400,000) [Scope, rates, quantities, on costs]
You state you rejected Option 3 to leave the roof during construction. Would this have complied with building regulations?
What preliminary costs did you adjust during negotiations with the contractor for the final firm roofing costs?
In your reflective analysis, you mention that this was noted in the risk register? How did assess the risk?(severity, likelihood)
What changes did the client have to instruct in order to achieve BREEAM Outstanding over Excellent rating?
What are the key cost differences between the 180k and 400k?
£100k for temporary roof
£40k for hoist
£14k for full time site manager and labourers
£8k design twice
Overall uplift of prelims, design, and insurance %’s
What are the key cost differences between the 400k and 60k?
£95k for type 3 and flashings replacement
£14k for prelims
£100k for temporary roof
£40k for hoist
£15k for edge protection
£8k double design
Overall uplift of prelims, design, and insurance %’s
