New shed footings

[snipe]

Just putting a new building up. 50ft span 22ft eaves. We have had to build up the ground about 4 foot. The footings have be dug down to the original clay (3ft by 3ft with over half a m2 of concrete in each hole for bolt boxes) would I need to pour concrete round the legs or can I just back fill with clay. The legs will be bolted to the concrete about 4 ft below finished floor level. Will be used as a straw shed, but you never now in the future if it will hold grain.

 

[Steevo]

If it were mine I would use stone rather than concrete or clay. A lot cheaper than concrete, but stronger and less likely to shrink/move than clay.

 

[Zebbedee]

I would be tempted to pour concrete up to floor level if possible, how big a shed is it eg how many legs?
Any backfill such as your clay compacted back in when dry will be fine just concrete imo would be better even if you only did the bay with wind bracing in it

 

[Suffolksucklers]

Appreciate its not always possible but it's always useful to have somewhere to dump that extra half a cube from other concreting jobs. That's what we did on our cattle shed when we concreted the apron and feed passages, just put the leftovers around the posts

 

[HatsOff]

Proper detail is to paint the steel with bitumen, shutter around the column and pour 100mm (4") of concrete around the post. This is mainly as corrosion protection.

I definitely wouldn't use clay, stone maybe if the steel is galvanised.

 

[snipe]

100x50ft. Painted not galvanised