Foundation

woodturner

Could someone tell me what depth and width a foundation needs to be for a double leaf block wall?

muffler

There is no one size fits all I'm afraid. You need to engage a structural engineer.

GMSA

3ft wide and 1 ft deep min with rebar or weldmesh placed about 3 inchs off the floor of the foundation and maybe more under the finished surface. Just a rough idea whats common for housebuilding in a lot of good sound soils. Softer soils may need a different approach.

Dublin City Handyman

woodturner wrote: »

Could someone tell me what depth and width a foundation needs to be for a double leaf block wall?

The foundation in width is 3 times the size of the wall that's going on it, so if there's a twin leaf wall going on above the ground (300 work) the foundation width should be 900mm or more.. The depth would depend on what the ground is like and what buildings are there(under pining).. So on.

woodturner

It's for a small workshop roughly 30 X 20. I was told to go down the cavity block route and dry line the inside but as I'll be teaching woodturning and woodworking, projectiles could come off machines and into the slabs.

looksee

Heavens, if there will be that many projectiles I trust you will have lots of insurance and goggles for your students!

woodturner

looksee wrote: »

Heavens, if there will be that many projectiles I trust you will have lots of insurance and goggles for your students!

There shouldn't be but things happen. All safety gear would be provided and insurance would be in place.

Bonzo Delaney

woodturner wrote: »

It's for a small workshop roughly 30 X 20. I was told to go down the cavity block route and dry line the inside but as I'll be teaching woodturning and woodworking, projectiles could come off machines and into the slabs.

If it's a shed that you want to stay dry and not have issues with condensation I'd build it 12 inch cavity wall so a 36 x12 inch foundation is needed with min 3/8mesh steel then before rendering the outside walls pump the 4 inch cavity with bead insulation. It'll leave you with solid walls inside for fixing shelves / displays and benches to.it might be a bit more costly but worth it over the years when your in it in winter time.

delly

As per muffler's post above, please do not depend on anonymous posts on boards to dictate your foundations.