Hi Mr. samer and Mr. Mike Testro,

First, thanks for the insight, it helps me to come up with ideas how to present the claim after all when your negotiatiing with the business minded Owner ( who’s very concern was to seek savings on the lump sum contract) and their "middle man / post-office" representatives or what they call them as Project Managers, its only a matter of simplified presentation to make them understand the repercussion of the revised design... The four interfaces that mr. mike had said would be a good start which was luckily mentioned on my submitted Time Extension claim.

Secondly, let me tell you additional information that i didn’t discussed.
1.)Some of outer cladding or perimeter walls w/c was originally precast wall was also changed to cast-in-place RC wall. For this 32 days time extension claim was submitted proportional to the quantity of the revised design.
2.) We had proposed a "sprayed concrete" which has a capacity of 1,200 sq. m. per week accomplishment to be an alternative to the primitive masonry wall. But the owner expects no cost implication so we did not push through since the cost was too high not enough to offset by masonry hauling, repairs, productivity loss.

3.)We have came to a point where the backpropping/reshorings were already removed and we are about to start the architectural wet works on the mock-up floor and this issue was being neglected despite follow-up letters.

Thirdly, I’ve came up the 4 months by adding a percentage of the added CHB which was originally Drywall to the original duration of CHB walls affecting MEPF embedments and major activities would be pushed such as the start of glass windows (8 floors sealed-off consideration) which we assumed to start after the substantial completion of wet finishes for us to protect breakage and dirt on the glass.

Best of luck to the two of you.

Regards, Christian