My problem is if for example there are totally 3 layers each allow +/- 5mm tolerance, the bottom is actual +5mm higher, the middle layer is also +5mm higher, while the top layer is also +5mm higher , it comes out total +15mm higher, but the specification say the finished road level should be +/- 10mm only.
Do the contractor have any grant to say that the specification does not allow accumulative tolerance and who should bear the responsibility?
A prudent contractor works to the tolerances to achieve economies.
For example a tarmac road will be in 3 layers Base - Bearing and Wearing.
The lower courses are cheaper than the higher ones. If the tolerence for each layer is + - 10mm the the cheaper layers are increased and the upper layers decreased still achieving the finish level.
Member for
19 years 10 monthsHi GaryIt has to be
Hi Gary
It has to be calculated - Bottom up 5mm Mid up 5mm Top down 5mm should do it.
Best regards
Mike T.
Member for
15 years 9 monthsDear Mike, My problem is if
Dear Mike,
My problem is if for example there are totally 3 layers each allow +/- 5mm tolerance, the bottom is actual +5mm higher, the middle layer is also +5mm higher, while the top layer is also +5mm higher , it comes out total +15mm higher, but the specification say the finished road level should be +/- 10mm only.
Do the contractor have any grant to say that the specification does not allow accumulative tolerance and who should bear the responsibility?
Regards,
Gary Lo
Member for
19 years 10 monthsHi GaryA prudent contractor
Hi Gary
A prudent contractor works to the tolerances to achieve economies.
For example a tarmac road will be in 3 layers Base - Bearing and Wearing.
The lower courses are cheaper than the higher ones. If the tolerence for each layer is + - 10mm the the cheaper layers are increased and the upper layers decreased still achieving the finish level.
Best regards
Mike T.