Hello,
I received the following quote from my basement contractor:
"For the 25cm (10 inches) thick slab with a double layer of reinforcement using Q 424 mats, the following costs will apply.
Approximately 20 reinforcement mats are needed in the basement slab. The weight difference between a Q188 mat and a Q424 mat is about 42.7 kg (94 lbs) per mat, resulting in an additional steel amount of a total of 854 kg (1882 lbs).
Extra steel in the slab = 854 kg (1882 lbs) * €2.00/kg = €1708.00
Extra concrete (increasing thickness from 20cm (8 inches) to 25cm (10 inches)) = 88.95 m² (957 ft²) * 0.05 m (2 inches) = 4.45 m³ (157 ft³) * €188/m³ = €836.60
This adds up to a total of €2544.60 for the desired basement slab specification."
Unfortunately, I have no experience in this area. Is this a reasonable offer? Or should I stick with the 20 cm (8 inches) slab without extra cost?
->>> There is slate underneath the slab :-(
I received the following quote from my basement contractor:
"For the 25cm (10 inches) thick slab with a double layer of reinforcement using Q 424 mats, the following costs will apply.
Approximately 20 reinforcement mats are needed in the basement slab. The weight difference between a Q188 mat and a Q424 mat is about 42.7 kg (94 lbs) per mat, resulting in an additional steel amount of a total of 854 kg (1882 lbs).
Extra steel in the slab = 854 kg (1882 lbs) * €2.00/kg = €1708.00
Extra concrete (increasing thickness from 20cm (8 inches) to 25cm (10 inches)) = 88.95 m² (957 ft²) * 0.05 m (2 inches) = 4.45 m³ (157 ft³) * €188/m³ = €836.60
This adds up to a total of €2544.60 for the desired basement slab specification."
Unfortunately, I have no experience in this area. Is this a reasonable offer? Or should I stick with the 20 cm (8 inches) slab without extra cost?
->>> There is slate underneath the slab :-(
D
Doc.Schnaggls1 Jul 2016 14:33Mueller9999 schrieb:
The data comes from the basement contractor, who only commissions the structural calculation once I have decided which foundation slab I want. Hello,
sorry, but that doesn’t make much sense.
A structural calculation must be carried out for the entire building according to the prevailing ground conditions, not just for the basement.
What will you do if, after building your house on your 20cm (8 inches) foundation slab, the whole structure starts to tilt or the slab cracks?
A first step should also be a soil investigation so that you can design your foundation accordingly.
I strongly recommend getting professional support!
Regards,
Dirk
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