Foundations for steel framed workshop?

[8ob]

I laid a base for a steel framed building a few years ago, that was basically a raft with the stanchion bases all cast in as one. The reobars for the pits dug for the stanchions were tied in with the raft reinforcing mesh. That was to building regs.
It’s worth spending time on the base and getting it laid out so that the side sheets of the building are tight against the side of the slab and that they sail past it by at least 100mm. With a bit of fannying about you can even cast in the bolts for the baseplates.

Bob

 

[Agrismith]

I laid a base for a steel framed building a few years ago, that was basically a raft with the stanchion bases all cast in as one. The reobars for the pits dug for the stanchions were tied in with the raft reinforcing mesh. That was to building regs.
It’s worth spending time on the base and getting it laid out so that the side sheets of the building are tight against the side of the slab and that they sail past it by at least 100mm.

Bob

View attachment 524086View attachment 524087View attachment 524088

Only problem in this instance would be the loss of 200mm internal head height to stay within permitted development.
A dwarf wall between the columns would achieve the same level of waterproofing but retain the 200mm internal head room.

 

[Bobupndown]

My 8x12m steel framed garage / workshop is bolted down to a 6" concrete base.

 

[Hooflungdung]

My 8x12m steel framed garage / workshop is bolted down to a 6" concrete base.View attachment 524090

So, that’s a simple reinforced concrete slab? No pads under the columns and no thickening around the perimeter?

 

[Bobupndown]

So, that’s a simple reinforced concrete slab? No pads under the columns and no thickening around the perimeter?

Yep.

 

[addjunkie]

My 8x12m steel framed garage / workshop is bolted down to a 6" concrete base.View attachment 524090

That frame is quite light in comparison to many similar buildings in size.
This link shows the way farm sheds are done. Floors are done after the building is up.

Callerburn Farm, Cornhill-on-Tweed | Glendale Engineering

Complete Design by Glendale's in house Structural Engineer Main Walls finished with Concrete Panels Roof Cladding Fibre Cement Big 6 Sides and Gable cladding Juniper Green Box Profile Sheets Single Phase Roller Shutter Door Supplied and Fitted

www.glendaleengineering.co.uk

 

[Bulldog_]

We were.... but its taken locsl planning department a bit over 20 weeks to give us a reply... saying no too garage its too big, and no to workshop because it'll be too big and they want a tree assessment to mske sure we don't harm any trees...

But like I said garage is sane suze as what we took down

And where workshop is the people who owned this before us had planning to build a road, fancy house and detached garage... and then the sane again a bit further along.

Its been a total waste of time, real kick in the nuts.

People who lived here before us hired sone flash company to run their appeal for them to get the permission for the houses... we'll track them down and see how much they'll charge.

If this happened to me I would employ a planning consultant. Find an independent one and they are not too expensive, last one I spoke to wanted around £1k for a house knock down and rebuild.

The planners take you more seriously when you get them involved.

 

[Pete.]

So, that’s a simple reinforced concrete slab? No pads under the columns and no thickening around the perimeter?

What you can do depends on what your building on. I built a double garage on chalk which required no footings at all. Also building control might tell you that you need to do something that you don't strictly need to do just because it's best practice. I was part-way round digging a 600x600 footing in that chalk and flint when I was told by a builder that it wasnt necessary for that ground type. I called building control and put it to them and the guy said "well no it's not required on chalk but I thought you wanted to do it right."

 

[Pigeon_Droppings2]

I've hear in some countries the bedrock is so shallow that they can just have a quick sweep and start laying the blocks.

 

[Keithmac]

Own design.

Two separate buildings each under 30 square metres. Both garages, although one will be used primarily for restoring a couple of cars, the other for storing the cars when they aren’t being worked on. Virtually no gap between them. Constrained between a property boundary on the rear and the long side and an existing building on the shortest side.

Clay. Happy to be corrected but as I understand it, if they are under 30 square metres and built of substantially fire proof materials, no building regs are required.

The maximum height is 2.5m dropping to 2.1m at the eaves on the boundary.


That’s an interesting approach. I have seen that done on larger buildings. Food for thought.


The soil is clay but not a mining area. How big was your building?

I have looked into this.

0 to 15m² is a free for all.

Over 15m² up to 30m² is Permitted Development but requires Building Control.

Over 30m² is Planning and BC.

I've got similar plans to you having 2 30m² next to each other.

 

[Pigeon_Droppings2]

Reckon if you went for some sort of pre made kit it would likely be designed to pass all the BC stuff.

My Compton's was just under 30sqm and just under 2.5m height and I didn't require any planning or signoff (although rules may have changed)...they even had a guy to do the raft base too. I still remember how quick it was...1.5 days to build onto the base.

 

[Hooflungdung]

I have looked into this.

0 to 15m² is a free for all.

Over 15m² up to 30m² is Permitted Development but requires Building Control.

Over 30m² is Planning and BC.

I've got similar plans to you having 2 30m² next to each other.

From the Planning Portal:

Is building regulations approval needed for an outbuilding?​

• Under 15m²: Generally exempt if no sleeping accommodation.
• 15m² to 30m²: Exempt if no sleeping accommodation AND either at least 1m from the boundary OR made substantially from non-combustible materials.

 

[Pigeon_Droppings2]

AND either at least 1m from the boundary OR made substantially from non-combustible materials.

I had the same requirements...Compton's is cement panels with a metal roof! The roof I have is felt/batten with steel trusses ...so no condensation issues

They often come up for free if you're willing to take it down.