Garage base - Garage base

[balooboat]

Iwant to add an extesion to the garage which will be 4mtr x 2mtr the footings will be 300 x 200mm and the base 150mm thick, should I do the job in one go or put the footings in first and then the base

[DNgroundworks]

Footings first then base, is the garage just a single skin as 300mm is to narrow a footing for a cavity wall, 200mm is a bit shy i always use the rule 10" minimum on good ground and then err on the side of caution and go a bit deeper sometimes.

150mm for the slab with visqueen should be fine

[DNgroundworks]

Unless its going through building control then you building inspector will tell you how deep to go with the footings:)

[balooboat]

Hi fellas, yes the garage is only single skin

[balooboat]

thanks DN, I'll make the footings 10" deep, also can I use some old black plastic dpc under the base, the material is very similar to a rubble sack.

[DNgroundworks]

Visqueen should be under the slab mate, available from all builders merchants.

[balooboat]

thanks DN, hard times trying to save a few bob

[mickg]

for the sake of a few pounds I certainly would not skimp on a roll of 100mm damp to guarantee you will not have any problems in a few years time

B and Q sell it for £6.78 a roll, stop being a tight t**t and go and buy one :p

[balooboat]

I consider myself told off. I'll get some visqueen tomorrow.
Thanks everybody.
Chris